Refactored stream observations and config refresh handling.

owncastsentry/README.md

@@ -0,0 +1,390 @@
+# OwncastSentry Package
+
+This package contains the Maubot plugin runtime code for OwncastSentry. It
+tracks room subscriptions to Owncast instances, polls subscribed streams,
+detects stream state changes, and sends Matrix notifications.
+
+This README gives maintainers a high-level map of how the package fits
+together and where the important behavior lives. User-facing setup and command
+usage belong outside this package. Function-level details belong in docstrings
+or tests.
+
+## Files
+
+- `__init__.py`: Maubot plugin entry point, service wiring, command
+  decorators, scheduler loop, shutdown, and metrics endpoint.
+- `config.py`: Maubot configuration proxy for the Prometheus metrics endpoint
+  setting.
+- `types.py`: immutable value objects, Owncast API response validation, derived
+  stream status, update results, and subscription domain errors.
+- `repository.py`: database schema migrations plus stream and subscription
+  repositories.
+- `owncast_client.py`: bounded aiohttp client for Owncast `/api/status` and
+  `/api/config` requests.
+- `subscription_manager.py`: subscription use cases, domain normalization, and
+  first-subscription Owncast validation.
+- `stream_monitor.py`: stream update orchestration, state transition detection,
+  progressive failure backoff, cleanup thresholds, notification decisions, and
+  stream metrics.
+- `notification_service.py`: Matrix notification formatting, broadcast,
+  per-domain notification cooldowns, cleanup notices, and delivery metrics.
+- `commands.py`: Maubot command handlers for subscribe, unsubscribe,
+  subscriptions, and live listings.
+- `metrics.py`: isolated Prometheus registry, counters, gauges, and response
+  timing helpers.
+
+The package has a service-layer shape: `OwncastSentry.start()` builds the
+services, commands call `CommandHandler`, command handlers call
+`SubscriptionManager`, scheduled updates call `StreamMonitor`, and
+`StreamMonitor` coordinates repositories, the Owncast client, notifications,
+and metrics.
+
+```mermaid
+flowchart LR
+    Maubot["Maubot loads OwncastSentry"] --> Start["OwncastSentry.start()"]
+    Start --> Repos["StreamRepository and SubscriptionRepository"]
+    Start --> Owncast["OwncastClient"]
+    Start --> Metrics["MetricsService"]
+    Start --> Notify["NotificationService"]
+    Start --> Monitor["StreamMonitor"]
+    Start --> Manager["SubscriptionManager"]
+    Start --> Commands["CommandHandler"]
+    Commands --> Manager
+    Manager --> Repos
+    Manager --> Owncast
+    Monitor --> Repos
+    Monitor --> Owncast
+    Monitor --> Notify
+    Monitor --> Metrics
+    Notify --> Repos
+    Notify --> Matrix["Matrix client"]
+```
+
+## Core Concepts
+
+A few terms are used throughout the package:
+
+- A stream is a normalized Owncast domain tracked by the plugin. The database
+  stores one stream row per domain, even if multiple Matrix rooms subscribe to
+  it.
+- A subscription is a Matrix room's request to receive notifications for one
+  stream domain.
+- `StreamStateObservation` is one successful Owncast status API sample. The
+  monitor decides whether the observation starts a new persisted status period.
+- `StreamConfigObservation` is metadata fetched from Owncast's config API,
+  currently the instance name and tags used in notifications and periodic
+  display-name refreshes.
+- `StreamState` is an immutable snapshot of the latest persisted state for a
+  stream: display metadata, the latest Owncast online flag, when that status was
+  first observed by the bot, failure count, and the derived online, offline, or
+  unknown status.
+
+Durable state lives in the database. The `streams` table stores the latest
+known display and state fields for each Owncast domain, and the `subscriptions`
+table stores which Matrix rooms follow each domain.
+
+Subscriptions are room-scoped, while stream state is shared per domain.
+Notification delivery fans out from one stored stream state to the rooms
+currently subscribed to that domain.
+
+Stream identity is the normalized bare domain. Repositories, metrics,
+notification state, and Owncast API calls all use that domain rather than the
+original user-supplied URL.
+
+Failures stay isolated at plugin boundaries. A bad command, failed stream
+check, or room delivery is logged and counted without stopping unrelated
+commands, stream updates, or notifications.
+
+`StreamStateObservation`, `StreamConfigObservation`, `StreamState`,
+`UpdateResult`, and `RoomSubscription` are immutable snapshots. State changes
+are represented by new values that are persisted through repositories instead of
+mutating existing objects.
+
+## Service Wiring
+
+`OwncastSentry.start()` is the composition root for one plugin instance. It
+loads config, creates the metrics service, Owncast API client, repositories,
+notification service, stream monitor, subscription manager, and command handler,
+then passes dependencies into each service explicitly.
+
+This keeps lower-level modules independent of Maubot globals. Commands do not
+construct repositories, `StreamMonitor` does not know about the Maubot
+scheduler, and notification delivery does not fetch its own subscription state
+from the plugin instance.
+
+The plugin boundary owns scheduling. The minute loop loads subscribed domains
+from `SubscriptionRepository` and calls `StreamMonitor.update_all_streams()`.
+The same pattern applies to new background work: schedule it from the plugin
+boundary, keep the worker service callable directly, and close owned external
+resources from `OwncastSentry.stop()`.
+
+## Subscription Management
+
+`SubscriptionManager` coordinates the room-to-domain relationship. Command
+handlers pass it user-supplied stream targets, and it turns those targets into
+normalized domains before touching repository state.
+
+Subscribing a room creates a subscription for the normalized domain and creates
+the shared stream row when the domain is first seen. First-time domains are
+validated through `OwncastClient`; domains that already have subscribers reuse
+the existing stream record instead of revalidating.
+
+Unsubscribing removes one room's subscription to a domain. It does not delete
+the shared stream row or make remote Owncast requests. Long-term dead stream
+cleanup is owned by `StreamMonitor`.
+
+Listing methods stay room-scoped. They return the subscriptions relevant to one
+Matrix room, with the shared stream state attached for display.
+
+## Owncast API Client
+
+`OwncastClient` owns the aiohttp session used for Owncast API requests. It
+fetches stream status and instance config, validates response shape, and turns
+accepted responses into the value objects used by the rest of the package.
+
+The session uses a plugin-specific User-Agent, a dummy cookie jar, no DNS cache,
+a global connection limit, a per-host connection limit of one, and connect/read
+socket timeouts. aiohttp's own DNS cache is disabled so DNS caching and policy
+stay with the resolver configured for the deployment.
+
+The per-host connection limit and keepalive settings are intentional. Each
+Owncast instance gets at most one reusable connection, so minute-by-minute
+status checks can reuse the existing TLS session instead of opening a fresh
+connection for every poll.
+
+Responses are accepted only when they are HTTP 200 JSON objects under the
+configured size limit. Invalid JSON, non-object JSON, oversized bodies,
+unexpected status codes, malformed API fields, connection errors, and timeouts
+are logged and ignored.
+
+The response-time metric is recorded only when a request completes and the
+parsed response shape is valid. Failed requests remove any stale timing label
+for that domain.
+
+## Stream Monitoring
+
+`StreamMonitor` owns the core per-domain state machine. `update_stream()`
+compares the stored stream state with the latest Owncast status response,
+decides whether to send a notification, updates persistent state when needed,
+and records stream metrics. Each poll first handles missing rows, polling
+backoff, and failed Owncast requests. Only a valid status response enters the
+stream transition policy. `update_all_streams()` wraps this flow for many
+domains, isolates per-domain exceptions, and records subscription-count metrics.
+
+```mermaid
+flowchart TD
+    Start["update_stream(domain)"] --> Old["load stored StreamState"]
+    Old --> Missing{"row exists?"}
+    Missing -->|no| Noop["return success"]
+    Missing -->|yes| Backoff{"backoff allows poll?"}
+    Backoff -->|no| Skip["skip HTTP call<br/>increment failure counter"]
+    Skip --> CleanupSkip["run warning/deletion cleanup checks"]
+    CleanupSkip --> MetricsSkip["if row remains, update<br/>status and failure metrics"]
+    MetricsSkip --> SuccessSkip["return success"]
+    Backoff -->|yes| Fetch["fetch and validate /api/status"]
+    Fetch --> Fetched{"got valid state?"}
+    Fetched -->|no| Failure["increment failure counter"]
+    Failure --> CleanupFail["run warning/deletion cleanup checks"]
+    CleanupFail --> MetricsFail["if row remains, update<br/>status and failure metrics"]
+    MetricsFail --> Failed["return failure"]
+    Fetched -->|yes| Reset["reset failure counter and metric"]
+    Reset --> Timer["ensure offline timer<br/>cache entry exists"]
+    Timer --> Transition["classify stream transition"]
+    Transition --> First{"first observation?"}
+    First -->|yes| FirstLog["log suppressed notification"]
+    First -->|no| LiveCheck{"went live?"}
+    FirstLog --> ConfigDecision
+    LiveCheck -->|yes| Brief{"observed offline less than<br/>temporary cooldown?"}
+    LiveCheck -->|no| TitleChanged{"title changed<br/>while online?"}
+    Brief -->|no| LiveNotify["go-live notification needed"]
+    Brief -->|yes| BriefTitle{"title changed?"}
+    BriefTitle -->|yes| BriefNotify["title-change notification needed"]
+    BriefTitle -->|no| NoNotify["no notification"]
+    TitleChanged -->|yes| OfflineMarker{"offline marker newer than<br/>last notification?"}
+    TitleChanged -->|no| WentOffline{"went offline?"}
+    WentOffline -->|yes| Offline["record offline timer"]
+    WentOffline -->|no| NoNotify
+    OfflineMarker -->|yes| ResumeNotify["go-live notification needed"]
+    OfflineMarker -->|no| TitleNotify["title-change notification needed"]
+    NoNotify --> ConfigDecision
+    Offline --> ConfigDecision
+    LiveNotify --> ConfigDecision
+    BriefNotify --> ConfigDecision
+    ResumeNotify --> ConfigDecision
+    TitleNotify --> ConfigDecision
+    ConfigDecision{"notification, first observation,<br/>or hourly refresh?"}
+    ConfigDecision -->|yes| Config["fetch /api/config"]
+    ConfigDecision -->|no| NotifyGate{"notification needed?"}
+    Config --> NotifyGate
+    NotifyGate -->|yes| Send["attempt live/title notification"]
+    NotifyGate -->|no| Save["save stream row<br/>repository ignores unchanged values"]
+    Send --> Save
+    Save --> FinalMetrics["set current status metric"]
+    FinalMetrics --> Done["return success"]
+```
+
+Failure counters drive both status and polling behavior. A stream is displayed
+as unknown when its failure counter is above `UNKNOWN_STATUS_THRESHOLD`.
+Counters 0 through 4 poll every minute; later tiers poll only on selected
+counter values and eventually only every fifteenth minute. Skipped cycles still
+increment the counter so cleanup can progress.
+
+Transition decisions use Owncast's `online` field. The stream status timestamp is
+the bot's local UTC observation time for the first successful poll, a missing
+timestamp repair, or an online/offline transition. Owncast's remote connect,
+disconnect, and server timestamps are not required for status parsing.
+
+First observation is special. If a new stream row has no status timestamp, the
+first successful update fetches config and stores state but suppresses
+notification attempts, even if the stream is already live.
+
+Go-live notification attempts happen when a stream moves from offline to online
+and the monitor's in-memory offline timer shows it was not merely a brief
+outage. A stream that returns within the temporary offline cooldown only attempts
+a notification when the title changed, and then it uses a title change
+notification.
+
+Mid-session title changes attempt title change notifications. If the monitor has
+an offline marker that is newer than the last notification, it attempts a normal
+live notification instead so rooms do not see a title change for what is
+effectively a new session.
+
+Offline transitions do not notify rooms. They update the database and record a
+monotonic offline timestamp used by later live/title notification policy.
+
+The live/title notification send step is an attempt, not a guaranteed Matrix message.
+`NotificationService` still applies the shared live/title cooldown and records
+the cooldown only when at least one room receives the message.
+
+`/api/config` is fetched when the monitor is about to attempt a live or
+title-change notification, on a stream's first successful observation, and
+during the hourly refresh window for successfully polled streams. The config
+response supplies the display name and tags for notifications. If config is
+fetched successfully during an update, the persisted stream name is refreshed
+from it; otherwise the stored name is left unchanged.
+
+## Cleanup Policy
+
+A domain that remains unreachable is eventually cleaned up. The failure counter
+represents minute ticks, including skipped backoff ticks.
+
+At the 83-day threshold, `StreamMonitor` sends a cleanup warning to all rooms
+subscribed to the domain. At the 90-day threshold or beyond, it sends a deletion
+notice, deletes all subscriptions for the domain, deletes the stream row, clears
+the monitor and notification caches for that domain, and removes per-domain
+metrics.
+
+```mermaid
+flowchart TD
+    Counter["failure counter after failed or skipped check"] --> Warn{"counter == 83 days?"}
+    Warn -->|yes| Warning["send cleanup warning"]
+    Warn -->|no| Delete
+    Warning --> Delete{"counter >= 90 days?"}
+    Delete -->|no| Done["done"]
+    Delete -->|yes| Notice["send cleanup deletion notice"]
+    Notice --> Subs["delete subscriptions"]
+    Subs --> Stream["delete stream row"]
+    Stream --> Caches["clear local caches"]
+    Caches --> Metrics["remove per-domain metrics"]
+    Metrics --> DoneCleanup["done"]
+```
+
+## Notification Delivery
+
+`NotificationService` sends plain text Matrix messages to every room subscribed
+to a domain. Broadcasts run concurrently and use `asyncio.gather(...,
+return_exceptions=True)` so one failed room does not block delivery to other
+rooms.
+
+Live and title-change notifications share a per-domain cooldown. The cooldown
+is recorded only when at least one room receives the message. If there are no
+subscribed rooms, or every delivery fails, no cooldown is recorded.
+
+Notification text is whitespace-normalized before sending. Stream names fall
+back to the domain when config lookup fails or the instance name is empty. Tags
+are appended as hash tags after filtering out empty tags and tags that start
+with a dot.
+
+Cleanup warning and deletion notices bypass the live/title cooldown, but still
+record delivery metrics.
+
+## Command Handling
+
+`OwncastSentry` exposes Maubot command decorators in `__init__.py`, but command
+behavior lives in `CommandHandler`. The plugin entry points are thin wrappers
+that catch unexpected exceptions and record command error metrics.
+
+`CommandHandler.subscribe()` and `CommandHandler.unsubscribe()` translate
+domain errors into user-facing Matrix replies. `subscriptions()` and `live()`
+read resolved room subscriptions and render Markdown output with escaped
+untrusted text.
+
+Command listings are room-scoped and ordered by domain through repository
+queries. `subscriptions()` includes online, offline, and unknown streams.
+`live()` includes only rows marked online with a failure count at or below the
+unknown threshold.
+
+## Persistence
+
+The database schema is managed by `repository.py` through Maubot's upgrade
+table.
+
+- Revision 1 creates `streams` and `subscriptions`.
+- Revision 2 fixes `subscriptions.stream_domain` from `INTEGER` to `TEXT`.
+- Revision 3 adds `streams.failure_counter`.
+- Revision 4 replaces separate connect/disconnect timestamps with
+  `streams.online` and `streams.status_since`.
+
+Repositories own SQL access. `StreamRepository.update()` writes display
+and state fields; failure counters use dedicated methods.
+`SubscriptionRepository` raises domain-specific errors for duplicate adds and
+missing removes.
+
+Resolved subscription listings join `subscriptions` to `streams`, which means
+orphaned subscription rows without a stream row are skipped in room display
+queries.
+
+## Metrics
+
+`MetricsService` uses a private `CollectorRegistry` so plugin metrics do not mix
+with process-global Prometheus collectors.
+
+The registered metrics cover:
+
+- notification delivery attempts by type and result;
+- current stream status per domain (`1` online, `0` offline, `-1` unknown);
+- subscription count per domain;
+- consecutive check failures per domain;
+- last successful Owncast API response duration per domain;
+- build/version information;
+- open aiohttp connection count;
+- internal scheduler and command errors.
+
+Known counter label combinations are initialized to zero. This keeps the
+Prometheus output stable before any events have occurred.
+
+## Test Map
+
+Start with these tests when changing package behavior:
+
+- `tests/test_types.py`: immutable value objects, API response shape checks,
+  truncation, stream status derivation, and subscription errors.
+- `tests/test_repository.py`: schema-backed stream and subscription repository
+  behavior.
+- `tests/test_subscription_manager.py`: domain normalization, subscribe and
+  unsubscribe workflows, validation skipping, and room listing delegation.
+- `tests/test_owncast_client.py`: Owncast API request handling, response body
+  limits, validation failures, User-Agent, response timing, and connection
+  counts.
+- `tests/test_stream_monitor.py`: polling backoff, first-update suppression,
+  live/offline/title transitions, cleanup thresholds, exception isolation, and
+  monitor metrics.
+- `tests/test_notification_service.py`: message formatting, sanitization,
+  cooldown behavior, broadcast failure accounting, cleanup notices, and
+  notification metrics.
+- `tests/test_commands.py`: end-to-end Maubot command behavior, Markdown
+  escaping, duration formatting, room-scoped subscription listings, and live
+  listings.
+- `tests/test_metrics.py`: Prometheus counters, gauges, response timer,
+  per-domain label removal, build info, open connections, and isolated registry
+  output.

owncastsentry/__init__.py

@@ -14,6 +14,8 @@
 
 """OwncastSentry maubot plugin."""
 
+import asyncio
+from datetime import UTC, datetime
 from typing import TYPE_CHECKING
 
 from aiohttp import web
@@ -23,12 +25,12 @@ from prometheus_client.exposition import choose_encoder
 
 from .commands import CommandHandler
 from .config import Config
-from .database import StreamRepository, SubscriptionRepository
 from .metrics import ErrorSource, MetricsService
-from .migrations import get_upgrade_table
 from .notification_service import NotificationService
 from .owncast_client import OwncastClient
+from .repository import StreamRepository, SubscriptionRepository, get_upgrade_table
 from .stream_monitor import StreamMonitor
+from .subscription_manager import SubscriptionManager
 
 if TYPE_CHECKING:
     from mautrix.util.async_db import Database, UpgradeTable
@@ -49,10 +51,10 @@ class OwncastSentry(Plugin):
         return Config
 
     async def start(self) -> None:
-        """Initialize all services and register recurring tasks.
+        """Initialize services and schedule stream state updates.
 
-        Registers a recurring task every minute to update the state of
+        Starts a scheduler coroutine that updates subscribed streams at the top
-        all subscribed streams.
+        of each wall-clock minute.
         """
         # Load configuration
         config: Config = self.config  # type: ignore[assignment]
@@ -97,30 +99,25 @@ class OwncastSentry(Plugin):
             metrics=self.metrics_service,
         )
 
-        # Initialize command handler
+        # Initialize subscription manager
-        self.command_handler = CommandHandler(
+        self.subscription_manager = SubscriptionManager(
             self.owncast_client,
             self.stream_repo,
             self.subscription_repo,
             self.log,
         )
 
-        # Schedule periodic stream state updates every 60 seconds
+        # Initialize command handler
-        self.sched.run_periodically(60, self._update_all_stream_states)
+        self.command_handler = CommandHandler(
-
+            self.subscription_manager,
-    async def _update_all_stream_states(self) -> None:
-        """Update all stream states."""
-        try:
-            # Get list of all stream domains with active subscriptions
-            subscribed_domains = (
-                await self.subscription_repo.get_all_subscribed_domains()
         )
 
-            # Delegate to stream monitor
+        # Schedule stream state updates at the top of each wall-clock minute.
-            await self.stream_monitor.update_all_streams(subscribed_domains)
+        self.sched.run_later(0, self._run_stream_updates_every_minute())
-        except Exception:
+
-            self.metrics_service.record_error(ErrorSource.SCHEDULER_LOOP)
+    async def stop(self) -> None:
-            self.log.exception("Unhandled exception in scheduler loop.")
+        """Clean up resources by closing the HTTP session."""
+        await self.owncast_client.close()
 
     @command.new(help="Subscribes to a new Owncast stream.")
     @command.argument("url")
@@ -164,6 +161,28 @@ class OwncastSentry(Plugin):
             self.log.exception("Unhandled exception in live command.")
             await evt.reply("An unexpected error occurred. Please try again later.")
 
+    async def _run_stream_updates_every_minute(self) -> None:
+        """Run stream state updates at the top of each wall-clock minute."""
+        while True:
+            current_time = datetime.now(UTC)
+            delay = 60 - current_time.second - (current_time.microsecond / 1_000_000)
+            await asyncio.sleep(delay)
+            await self._update_all_stream_states()
+
+    async def _update_all_stream_states(self) -> None:
+        """Update stream states for domains with active subscriptions."""
+        try:
+            # Get list of all stream domains with active subscriptions
+            subscribed_domains = (
+                await self.subscription_repo.get_all_subscribed_domains()
+            )
+
+            # Delegate to stream monitor
+            await self.stream_monitor.update_all_streams(subscribed_domains)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.SCHEDULER_LOOP)
+            self.log.exception("Unhandled exception in scheduler loop.")
+
     async def _metrics_endpoint(self, request: web.Request) -> web.Response:
         """Serve Prometheus metrics."""
         accept = request.headers.get("Accept", "")
@@ -172,7 +191,3 @@ class OwncastSentry(Plugin):
         response = web.Response(body=output)
         response.headers["Content-Type"] = content_type
         return response
-
-    async def stop(self) -> None:
-        """Clean up resources by closing the HTTP session."""
-        await self.owncast_client.close()

owncastsentry/commands.py

@@ -14,20 +14,75 @@
 
 """Command handlers for OwncastSentry bot commands."""
 
-import sqlite3
 from datetime import UTC, datetime
 from typing import TYPE_CHECKING
 
-from .models import StreamStatus
+from .types import (
-from .utils import domainify, sanitize_for_markdown
+    AlreadySubscribedError,
+    InvalidOwncastInstanceError,
+    NotSubscribedError,
+    StreamStatus,
+)
 
 if TYPE_CHECKING:
-    import logging
-
     from maubot import MessageEvent  # type: ignore[attr-defined]
 
-    from .database import StreamRepository, SubscriptionRepository
+    from .subscription_manager import SubscriptionManager
-    from .owncast_client import OwncastClient
+
+
+_MARKDOWN_ESCAPE_TABLE = str.maketrans({c: f"\\{c}" for c in r"\*_[]()~`#+-=|{}.!<>&"})
+_SECONDS_PER_MINUTE = 60
+_SECONDS_PER_HOUR = 60 * _SECONDS_PER_MINUTE
+_SECONDS_PER_DAY = 24 * _SECONDS_PER_HOUR
+
+
+def _sanitize_for_plain_text(text: str) -> str:
+    """Sanitize text before Markdown escaping."""
+    if not text:
+        return text
+
+    sanitized = text.replace("\n", " ").replace("\r", " ")
+    return " ".join(sanitized.split())
+
+
+def _escape_markdown(text: str) -> str:
+    """Escape Markdown special characters in untrusted text."""
+    if not text:
+        return text
+
+    return text.translate(_MARKDOWN_ESCAPE_TABLE)
+
+
+def _sanitize_for_markdown(text: str) -> str:
+    """Sanitize text for safe Markdown rendering."""
+    if not text:
+        return text
+
+    return _escape_markdown(_sanitize_for_plain_text(text))
+
+
+def _format_duration(timestamp_str: str, now: datetime) -> str:
+    """Calculate and format the duration from a timestamp to now."""
+    try:
+        timestamp = datetime.fromisoformat(timestamp_str)
+        delta = now - timestamp
+
+        seconds = int(delta.total_seconds())
+        if seconds < 0:
+            return "unknown duration"
+        if seconds < _SECONDS_PER_MINUTE:
+            return f"{seconds} second{'s' if seconds != 1 else ''}"
+        if seconds < _SECONDS_PER_HOUR:
+            minutes = seconds // _SECONDS_PER_MINUTE
+            return f"{minutes} minute{'s' if minutes != 1 else ''}"
+        if seconds < _SECONDS_PER_DAY:
+            hours = seconds // _SECONDS_PER_HOUR
+            return f"{hours} hour{'s' if hours != 1 else ''}"
+    except TypeError, ValueError:
+        return "unknown duration"
+    else:
+        days = seconds // _SECONDS_PER_DAY
+        return f"{days} day{'s' if days != 1 else ''}"
 
 
 class CommandHandler:
@@ -35,40 +90,23 @@ class CommandHandler:
 
     def __init__(
         self,
-        owncast_client: OwncastClient,
+        subscription_manager: SubscriptionManager,
-        stream_repo: StreamRepository,
-        subscription_repo: SubscriptionRepository,
-        logger: logging.Logger,
     ) -> None:
         """Initialize the command handler.
 
-        :param owncast_client: Client for making API calls to Owncast instances.
+        :param subscription_manager: Subscription domain workflow coordinator.
-        :param stream_repo: Repository for stream data.
-        :param subscription_repo: Repository for subscription data.
-        :param logger: Logger instance for debugging.
         """
-        self.owncast_client = owncast_client
+        self.subscription_manager = subscription_manager
-        self.stream_repo = stream_repo
-        self.subscription_repo = subscription_repo
-        self.log = logger
 
     async def subscribe(self, evt: MessageEvent, url: str) -> None:
         """Subscribe a room to a stream's notifications.
 
         :param evt: MessageEvent of the message calling the command.
-        :param url: User supplied URL to a stream to subscribe to.
+        :param url: User-supplied Owncast URL, domain, or Fediverse-style address.
         """
-        # Convert the user input to only a domain
+        try:
-        stream_domain = domainify(url)
+            stream_domain = await self.subscription_manager.subscribe(evt.room_id, url)
-
+        except InvalidOwncastInstanceError:
-        # How many subscriptions already exist for this domain?
-        subscription_count = await self.subscription_repo.count_by_domain(stream_domain)
-
-        if subscription_count == 0:
-            # No subscriptions; validate this is an Owncast stream.
-            is_valid = await self.owncast_client.validate_instance(stream_domain)
-            if not is_valid:
-                # Fetch returned nothing. Probably not Owncast.
             await evt.reply(
                 "The URL you supplied does not appear to "
                 "be a valid Owncast instance. You may have "
@@ -76,28 +114,12 @@ class CommandHandler:
                 "instance is offline."
             )
             return
-
+        except AlreadySubscribedError as e:
-        # Try to add a new subscription for this stream in this room
-        try:
-            await self.subscription_repo.add(stream_domain, evt.room_id)
-        except sqlite3.IntegrityError:
-            # Room is already subscribed.
             await evt.reply(
-                f"This room is already subscribed to notifications for {stream_domain}."
+                f"This room is already subscribed to notifications for {e.domain}."
             )
             return
 
-        # Try to add a placeholder row for the stream's state.
-        try:
-            await self.stream_repo.create(stream_domain)
-            # First time seeing this stream. Log it.
-            self.log.info(f"[{stream_domain}] Discovered new stream!")
-        except sqlite3.IntegrityError:
-            # Adding rows for known streams is expected.
-            pass
-
-        # All went well! Tell the user.
-        self.log.info(f"[{stream_domain}] Subscription added for room {evt.room_id}.")
         await evt.reply(
             f"Subscription added! This room will receive "
             f"notifications when {stream_domain} goes live."
@@ -107,68 +129,33 @@ class CommandHandler:
         """Unsubscribe a room from a stream's notifications.
 
         :param evt: MessageEvent of the message calling the command.
-        :param url: User supplied URL to a stream to unsubscribe from.
+        :param url: User-supplied Owncast URL, domain, or Fediverse-style address.
         """
-        # Convert the user input to only a domain
+        try:
-        stream_domain = domainify(url)
+            stream_domain = await self.subscription_manager.unsubscribe(
-
+                evt.room_id, url
-        # Attempt to delete the requested subscription
-        result = await self.subscription_repo.remove(stream_domain, evt.room_id)
-
-        # Did it work?
-        if result == 1:
-            # Yes, one row was deleted. Tell the user.
-            self.log.info(
-                f"[{stream_domain}] Subscription removed for room {evt.room_id}."
             )
+        except NotSubscribedError as e:
+            await evt.reply(
+                f"This room is already not subscribed to notifications for {e.domain}."
+            )
+            return
+
         await evt.reply(
             f"Subscription removed! This room will no "
             f"longer receive notifications for {stream_domain}."
         )
-        else:
-            # No, nothing changed. Tell the user.
-            await evt.reply(
-                "This room is already not subscribed to "
-                f"notifications for {stream_domain}."
-            )
-
-    def _format_duration(self, timestamp_str: str) -> str:
-        """Calculate and format the duration from a timestamp to now.
-
-        :param timestamp_str: ISO 8601 timestamp string.
-        :return: Formatted duration string (e.g., "1 hour", "2 days").
-        """
-        try:
-            timestamp = datetime.fromisoformat(timestamp_str)
-            now = datetime.now(UTC)
-            delta = now - timestamp
-
-            seconds = int(delta.total_seconds())
-            if seconds < 60:
-                return f"{seconds} second{'s' if seconds != 1 else ''}"
-            if seconds < 3600:
-                minutes = seconds // 60
-                return f"{minutes} minute{'s' if minutes != 1 else ''}"
-            if seconds < 86400:
-                hours = seconds // 3600
-                return f"{hours} hour{'s' if hours != 1 else ''}"
-            days = seconds // 86400
-            return f"{days} day{'s' if days != 1 else ''}"
-        except ValueError:
-            return "unknown duration"
 
     async def subscriptions(self, evt: MessageEvent) -> None:
         """List all stream subscriptions in the current room.
 
         :param evt: MessageEvent of the message calling the command.
         """
-        # Get all stream domains this room is subscribed to
+        subscriptions = await self.subscription_manager.list_room_subscriptions(
-        subscribed_domains = (
+            evt.room_id
-            await self.subscription_repo.get_subscribed_streams_for_room(evt.room_id)
         )
 
-        # Check if there are no subscriptions
+        if not subscriptions:
-        if not subscribed_domains:
             await evt.reply(
                 "This room is not subscribed to any Owncast "
                 "instances.\n\nTo subscribe to an Owncast "
@@ -178,36 +165,35 @@ class CommandHandler:
             return
 
         # Build the response message body as Markdown
-        count = len(subscribed_domains)
+        count = len(subscriptions)
         parts = [f"**Subscriptions for this room ({count}):**\n\n"]
+        now = datetime.now(UTC)
 
-        for domain in subscribed_domains:
+        for subscription in subscriptions:
-            # Get the stream state from the database
+            domain = subscription.domain
-            stream_state = await self.stream_repo.get_by_domain(domain)
+            stream_state = subscription.stream_state
-            if stream_state is None:
-                continue
-
-            # Determine stream name (use domain as fallback)
             stream_name = stream_state.name or domain
-            safe_stream_name = sanitize_for_markdown(stream_name)
+            safe_stream_name = _sanitize_for_markdown(stream_name)
 
             # Start building this stream's entry with stream name as main bullet
             parts.append(f"- **{safe_stream_name}**  \n")
 
             # Add title if stream is online (as a sub-bullet)
             if stream_state.status == StreamStatus.ONLINE and stream_state.title:
-                safe_title = sanitize_for_markdown(stream_state.title)
+                safe_title = _sanitize_for_markdown(stream_state.title)
                 parts.append(f"  - Title: {safe_title}  \n")
 
             # Determine status and duration (as a sub-bullet)
             match stream_state.status:
-                case StreamStatus.ONLINE if stream_state.last_connect_time:
+                case StreamStatus.ONLINE if stream_state.status_since:
-                    duration = self._format_duration(stream_state.last_connect_time)
+                    duration = _format_duration(stream_state.status_since, now)
                     parts.append(f"  - Status: Online for {duration}  \n")
+                case StreamStatus.ONLINE:
+                    parts.append("  - Status: Online  \n")
                 case StreamStatus.UNKNOWN:
                     parts.append("  - Status: Unknown (instance unreachable)  \n")
-                case StreamStatus.OFFLINE if stream_state.last_disconnect_time:
+                case StreamStatus.OFFLINE if stream_state.status_since:
-                    duration = self._format_duration(stream_state.last_disconnect_time)
+                    duration = _format_duration(stream_state.status_since, now)
                     parts.append(f"  - Status: Offline for {duration}  \n")
                 case StreamStatus.OFFLINE:
                     parts.append("  - Status: Offline  \n")
@@ -229,13 +215,12 @@ class CommandHandler:
 
         :param evt: MessageEvent of the message calling the command.
         """
-        # Get all stream domains this room is subscribed to
+        live_streams = await self.subscription_manager.list_live_room_subscriptions(
-        subscribed_domains = (
+            evt.room_id
-            await self.subscription_repo.get_subscribed_streams_for_room(evt.room_id)
         )
 
-        # Check if there are no subscriptions
+        if not live_streams:
-        if not subscribed_domains:
+            if not await self.subscription_manager.has_room_subscriptions(evt.room_id):
                 await evt.reply(
                     "This room is not subscribed to any Owncast "
                     "instances.\n\nTo subscribe to an Owncast "
@@ -244,15 +229,6 @@ class CommandHandler:
                 )
                 return
 
-        # Filter for only live streams (exclude unknown status)
-        live_streams = []
-        for domain in subscribed_domains:
-            stream_state = await self.stream_repo.get_by_domain(domain)
-            if stream_state and stream_state.status == StreamStatus.ONLINE:
-                live_streams.append((domain, stream_state))
-
-        # Check if there are no live streams
-        if not live_streams:
             await evt.reply(
                 "No subscribed Owncast instances are currently "
                 "live.\n\nUse `!subscriptions` to list all "
@@ -264,24 +240,28 @@ class CommandHandler:
         # Build the response message body as Markdown
         count = len(live_streams)
         parts = [f"**Live Owncast instances ({count}):**\n\n"]
+        now = datetime.now(UTC)
 
-        for domain, stream_state in live_streams:
+        for subscription in live_streams:
-            # Determine stream name (use domain as fallback)
+            domain = subscription.domain
+            stream_state = subscription.stream_state
             stream_name = stream_state.name or domain
-            safe_stream_name = sanitize_for_markdown(stream_name)
+            safe_stream_name = _sanitize_for_markdown(stream_name)
 
             # Start building this stream's entry with stream name as main bullet
             parts.append(f"- **{safe_stream_name}**  \n")
 
-            # Add title (should be present for live streams)
+            # Add title when available
             if stream_state.title:
-                safe_title = sanitize_for_markdown(stream_state.title)
+                safe_title = _sanitize_for_markdown(stream_state.title)
                 parts.append(f"  - Title: {safe_title}  \n")
 
             # Add status with duration
-            if stream_state.last_connect_time:
+            if stream_state.status_since:
-                duration = self._format_duration(stream_state.last_connect_time)
+                duration = _format_duration(stream_state.status_since, now)
                 parts.append(f"  - Online for {duration}  \n")
+            else:
+                parts.append("  - Online  \n")
 
             # Add stream link
             parts.append(f"  - Link: https://{domain}\n\n")

owncastsentry/database.py

@@ -1,199 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Database repository classes for OwncastSentry."""
-
-from typing import TYPE_CHECKING
-
-from .models import StreamState
-
-if TYPE_CHECKING:
-    from mautrix.util.async_db import Database
-
-
-class StreamRepository:
-    """Repository for managing stream data in the database."""
-
-    def __init__(self, database: Database):
-        """Initialize the stream repository.
-
-        :param database: The maubot database instance.
-        """
-        self.db = database
-
-    async def get_by_domain(self, domain: str) -> StreamState | None:
-        """Get a stream's state by domain.
-
-        :param domain: The stream domain.
-        :return: StreamState if found, None otherwise.
-        """
-        query = "SELECT * FROM streams WHERE domain=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            row = await conn.fetchrow(query, domain)
-            return StreamState.from_db_row(row) if row else None
-
-    async def create(self, domain: str) -> None:
-        """Create a new stream entry in the database.
-
-        :param domain: The stream domain.
-        """
-        query = "INSERT INTO streams (domain) VALUES ($1)"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(query, domain)
-
-    async def update(self, state: StreamState) -> None:
-        """Update a stream's state in the database.
-
-        :param state: The StreamState to save.
-        """
-        query = """UPDATE streams
-                   SET name=$1, title=$2, last_connect_time=$3, last_disconnect_time=$4
-                   WHERE domain=$5"""
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(
-                query,
-                state.name,
-                state.title,
-                state.last_connect_time,
-                state.last_disconnect_time,
-                state.domain,
-            )
-
-    async def exists(self, domain: str) -> bool:
-        """Check if a stream exists in the database.
-
-        :param domain: The stream domain.
-        :return: True if exists, False otherwise.
-        """
-        result = await self.get_by_domain(domain)
-        return result is not None
-
-    async def increment_failure_counter(self, domain: str) -> None:
-        """Increment the failure counter for a stream by 1.
-
-        :param domain: The stream domain.
-        """
-        query = """UPDATE streams
-                   SET failure_counter = failure_counter + 1
-                   WHERE domain=$1"""
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(query, domain)
-
-    async def reset_failure_counter(self, domain: str) -> None:
-        """Reset the failure counter for a stream to 0.
-
-        :param domain: The stream domain.
-        """
-        query = """UPDATE streams
-                   SET failure_counter = 0
-                   WHERE domain=$1"""
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(query, domain)
-
-    async def delete(self, domain: str) -> None:
-        """Delete a stream record from the database.
-
-        :param domain: The stream domain.
-        """
-        query = "DELETE FROM streams WHERE domain=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(query, domain)
-
-
-class SubscriptionRepository:
-    """Repository for managing stream subscriptions in the database."""
-
-    def __init__(self, database: Database):
-        """Initialize the subscription repository.
-
-        :param database: The maubot database instance.
-        """
-        self.db = database
-
-    async def add(self, domain: str, room_id: str) -> None:
-        """Add a subscription for a room to a stream.
-
-        :param domain: The stream domain.
-        :param room_id: The Matrix room ID.
-        :raises sqlite3.IntegrityError: If subscription already exists.
-        """
-        query = "INSERT INTO subscriptions (stream_domain, room_id) VALUES ($1, $2)"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            await conn.execute(query, domain, room_id)
-
-    async def remove(self, domain: str, room_id: str) -> int:
-        """Remove a subscription for a room from a stream.
-
-        :param domain: The stream domain.
-        :param room_id: The Matrix room ID.
-        :return: Number of rows deleted (0 or 1).
-        """
-        query = "DELETE FROM subscriptions WHERE stream_domain=$1 AND room_id=$2"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            result = await conn.execute(query, domain, room_id)
-            return int(result.rowcount)
-
-    async def get_subscribed_rooms(self, domain: str) -> list[str]:
-        """Get all room IDs subscribed to a stream.
-
-        :param domain: The stream domain.
-        :return: List of room IDs.
-        """
-        query = "SELECT room_id FROM subscriptions WHERE stream_domain=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            results = await conn.fetch(query, domain)
-            return [row["room_id"] for row in results]
-
-    async def get_subscribed_streams_for_room(self, room_id: str) -> list[str]:
-        """Get all stream domains that a room is subscribed to.
-
-        :param room_id: The Matrix room ID.
-        :return: List of stream domains.
-        """
-        query = "SELECT stream_domain FROM subscriptions WHERE room_id=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            results = await conn.fetch(query, room_id)
-            return [row["stream_domain"] for row in results]
-
-    async def get_all_subscribed_domains(self) -> list[str]:
-        """Get all unique stream domains that have at least one subscription.
-
-        :return: List of stream domains.
-        """
-        query = "SELECT DISTINCT stream_domain FROM subscriptions"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            results = await conn.fetch(query)
-            return [row["stream_domain"] for row in results]
-
-    async def count_by_domain(self, domain: str) -> int:
-        """Count the number of subscriptions for a given stream domain.
-
-        :param domain: The stream domain.
-        :return: Number of subscriptions.
-        """
-        query = "SELECT COUNT(*) FROM subscriptions WHERE stream_domain=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            result = await conn.fetchrow(query, domain)
-            return int(result[0])
-
-    async def delete_all_for_domain(self, domain: str) -> int:
-        """Delete all subscriptions for a given stream domain.
-
-        :param domain: The stream domain.
-        :return: Number of subscriptions deleted.
-        """
-        query = "DELETE FROM subscriptions WHERE stream_domain=$1"
-        async with self.db.acquire() as conn:  # type: ignore[var-annotated]
-            result = await conn.execute(query, domain)
-            return int(result.rowcount)

owncastsentry/metrics.py

@@ -21,7 +21,10 @@ from typing import TYPE_CHECKING
 
 from prometheus_client import CollectorRegistry, Counter, Gauge, Info
 
-from .models import StreamStatus
+from .types import StreamStatus
+
+if TYPE_CHECKING:
+    from collections.abc import Callable, Generator
 
 
 class NotificationType(StrEnum):
@@ -40,9 +43,6 @@ class ErrorSource(StrEnum):
     COMMAND = "command"
 
 
-if TYPE_CHECKING:
-    from collections.abc import Callable, Generator
-
 # Mapping from StreamStatus enum to numeric gauge values
 _STATUS_VALUES: dict[StreamStatus, float] = {
     StreamStatus.ONLINE: 1.0,
@@ -66,7 +66,8 @@ class _ResponseTimer:
         """Mark the request as successful so the duration is recorded."""
         self._should_observe = True
 
-    def _finalize(self) -> None:
+    def finalize(self) -> None:
+        """Record or discard the timing observation when the block exits."""
         if self._should_observe:
             self._gauge.labels(domain=self._domain).set(
                 max(time.monotonic() - self._start, 0)
@@ -109,7 +110,7 @@ class MetricsService:
         )
         self.api_response_seconds = Gauge(
             "owncastsentry_api_response_seconds",
-            "Last successful HTTP response time in seconds per stream domain",
+            "Last successful Owncast API query duration in seconds per stream domain",
             ["domain"],
             registry=self.registry,
         )
@@ -120,7 +121,7 @@ class MetricsService:
         )
         self.open_connections = Gauge(
             "owncastsentry_http_connections_open",
-            "Total number of open HTTP connections (idle and active)",
+            "Current number of open HTTP connections (idle and active)",
             registry=self.registry,
         )
         self.errors_total = Counter(
@@ -130,7 +131,7 @@ class MetricsService:
             registry=self.registry,
         )
 
-        # Initialize all known label combinations so they start at 0
+        # Initialize known counter label combinations so they start at 0
         for notification_type in NotificationType:
             for result in ("success", "failure"):
                 self.notification_delivery_total.labels(
@@ -185,10 +186,11 @@ class MetricsService:
 
     @contextmanager
     def response_timer(self, domain: str) -> Generator[_ResponseTimer]:
-        """Return a context manager that times an HTTP request.
+        """Return a context manager that times an Owncast API query.
 
         Call ``timer.success()`` inside the block to record the duration.
-        If ``success()`` is never called, nothing is recorded.
+        If ``success()`` is never called, any existing timing label for the
+        domain is removed.
 
         :param domain: The stream domain being queried.
         """
@@ -196,7 +198,7 @@ class MetricsService:
         try:
             yield timer
         finally:
-            timer._finalize()
+            timer.finalize()
 
     def set_build_info(self, version: str) -> None:
         """Set the build version info metric.

owncastsentry/migrations.py

@@ -1,100 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Database migration definitions for OwncastSentry."""
-
-from mautrix.util.async_db import Connection, UpgradeTable
-
-upgrade_table = UpgradeTable()
-
-
-@upgrade_table.register(description="Initial revision")  # type: ignore[arg-type, call-arg, untyped-decorator]
-async def upgrade_v1(conn: Connection) -> None:
-    """Create the initial database schema.
-
-    Creates the streams and subscriptions tables.
-
-    :param conn: A connection to run the v1 database migration on.
-    """
-    await conn.execute(
-        """CREATE TABLE "streams" (
-            "domain"    TEXT NOT NULL UNIQUE,
-            "name"  TEXT,
-            "title" TEXT,
-            "last_connect_time" TEXT,
-            "last_disconnect_time"  TEXT,
-            PRIMARY KEY("domain")
-        )"""
-    )
-
-    await conn.execute(
-        """CREATE TABLE "subscriptions" (
-            "stream_domain" INTEGER NOT NULL,
-            "room_id"   TEXT NOT NULL,
-            UNIQUE("room_id","stream_domain")
-        )"""
-    )
-
-
-@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
-    description="Fix stream_domain column type from INTEGER to TEXT"
-)
-async def upgrade_v2(conn: Connection) -> None:
-    """Upgrade database schema to version 2 format.
-
-    Fixes the stream_domain column type in the subscriptions table
-    from INTEGER to TEXT.
-
-    :param conn: A connection to run the v2 database migration on.
-    """
-    # Create new subscriptions table with correct schema
-    await conn.execute(
-        """CREATE TABLE "subscriptions_new" (
-            "stream_domain" TEXT NOT NULL,
-            "room_id"   TEXT NOT NULL,
-            UNIQUE("room_id","stream_domain")
-        )"""
-    )
-
-    # Copy all existing data from old table to new table
-    await conn.execute(
-        """INSERT INTO subscriptions_new (stream_domain, room_id)
-           SELECT stream_domain, room_id FROM subscriptions"""
-    )
-
-    # Drop the old table and rename new table to original name
-    await conn.execute("DROP TABLE subscriptions")
-    await conn.execute("ALTER TABLE subscriptions_new RENAME TO subscriptions")
-
-
-@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
-    description="Add failure_counter column for backoff and auto-cleanup"
-)
-async def upgrade_v3(conn: Connection) -> None:
-    """Upgrade database schema to version 3 format.
-
-    Adds the failure_counter column to track connection failures
-    for backoff and auto-cleanup.
-
-    :param conn: A connection to run the v3 database migration on.
-    """
-    # Add failure_counter column with default value of 0
-    await conn.execute(
-        """ALTER TABLE streams ADD COLUMN failure_counter INTEGER DEFAULT 0"""
-    )
-
-
-def get_upgrade_table() -> UpgradeTable:
-    """Return the upgrade table with registered migrations."""
-    return upgrade_table

owncastsentry/models.py

@@ -1,124 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Data models for OwncastSentry."""
-
-from dataclasses import dataclass, field
-from enum import Enum
-from typing import Any
-
-from .utils import (
-    MAX_INSTANCE_TITLE_LENGTH,
-    MAX_STREAM_TITLE_LENGTH,
-    MAX_TAG_LENGTH,
-    UNKNOWN_STATUS_THRESHOLD,
-    truncate,
-)
-
-
-class StreamStatus(Enum):
-    """Represents the status of a stream."""
-
-    ONLINE = "online"
-    OFFLINE = "offline"
-    UNKNOWN = "unknown"
-
-
-@dataclass
-class StreamState:
-    """Represents the state of an Owncast stream."""
-
-    domain: str
-    name: str | None = None
-    title: str | None = None
-    last_connect_time: str | None = None
-    last_disconnect_time: str | None = None
-    failure_counter: int = 0
-
-    @property
-    def status(self) -> StreamStatus:
-        """Derive stream status from failure count and connect times.
-
-        Returns UNKNOWN if failures exceed the threshold, ONLINE if a
-        connect time is present, or OFFLINE otherwise.
-        """
-        if self.failure_counter > UNKNOWN_STATUS_THRESHOLD:
-            return StreamStatus.UNKNOWN
-        if self.last_connect_time is not None:
-            return StreamStatus.ONLINE
-        return StreamStatus.OFFLINE
-
-    @classmethod
-    def from_api_response(cls, response: dict[str, Any], domain: str) -> StreamState:
-        """Create a StreamState from an API response.
-
-        :param response: API response as a dictionary (camelCase keys).
-        :param domain: The stream domain.
-        :return: StreamState instance.
-        """
-        return cls(
-            domain=domain,
-            title=truncate(response.get("streamTitle", ""), MAX_STREAM_TITLE_LENGTH),
-            last_connect_time=response.get("lastConnectTime"),
-            last_disconnect_time=response.get("lastDisconnectTime"),
-        )
-
-    @classmethod
-    def from_db_row(cls, row: dict[str, Any]) -> StreamState:
-        """Create a StreamState from a database row.
-
-        :param row: Database row as a dictionary.
-        :return: StreamState instance.
-        """
-        return cls(
-            domain=row["domain"],
-            name=row["name"],
-            title=row["title"],
-            last_connect_time=row["last_connect_time"],
-            last_disconnect_time=row["last_disconnect_time"],
-            failure_counter=row["failure_counter"],
-        )
-
-
-@dataclass
-class UpdateResult:
-    """Result of a stream update cycle."""
-
-    total_streams: int
-    successful_checks: int
-    failed_checks: int
-
-
-@dataclass
-class StreamConfig:
-    """Represents the configuration of an Owncast stream."""
-
-    name: str = ""
-    tags: list[str] = field(default_factory=list)
-
-    @classmethod
-    def from_api_response(cls, response: dict[str, Any]) -> StreamConfig:
-        """Create a StreamConfig from an API response.
-
-        :param response: API response as a dictionary.
-        :return: StreamConfig instance.
-        """
-        # Truncate instance name to max length
-        name = truncate(response.get("name", ""), MAX_INSTANCE_TITLE_LENGTH)
-
-        # Truncate each tag to max length
-        raw_tags = response.get("tags", [])
-        tags = [truncate(tag, MAX_TAG_LENGTH) for tag in raw_tags]
-
-        return cls(name=name, tags=tags)

owncastsentry/notification_service.py

@@ -21,18 +21,27 @@ from typing import TYPE_CHECKING, Any
 from mautrix.types import MessageType, TextMessageEventContent
 
 from .metrics import NotificationType
-from .utils import (
-    CLEANUP_DELETE_DAYS,
-    CLEANUP_WARNING_DAYS,
-    SECONDS_BETWEEN_NOTIFICATIONS,
-    sanitize_for_plain_text,
-)
 
 if TYPE_CHECKING:
     import logging
+    from collections.abc import Sequence
 
-    from .database import SubscriptionRepository
     from .metrics import MetricsService
+    from .repository import SubscriptionRepository
+
+
+_SECONDS_BETWEEN_NOTIFICATIONS = 20 * 60
+
+_CLEANUP_WARNING_DAYS = 83
+_CLEANUP_DELETE_DAYS = 90
+
+
+def _sanitize_for_plain_text(text: str) -> str:
+    """Sanitize text for plain text rendering."""
+    if not text:
+        return text
+
+    return " ".join(text.split())
 
 
 class NotificationService:
@@ -65,7 +74,7 @@ class NotificationService:
         domain: str,
         name: str,
         title: str,
-        tags: list[str],
+        tags: Sequence[str],
         *,
         title_change: bool = False,
     ) -> None:
@@ -83,28 +92,34 @@ class NotificationService:
                 time.monotonic() - self.notification_timers_cache[domain]
             )
             self.log.info(
-                f"[{domain}] Not sending notifications. Only "
+                "[%s] Not sending notifications. Only %s of required "
-                f"{seconds_since_last} of required "
+                "%s seconds have passed since last notification.",
-                f"{SECONDS_BETWEEN_NOTIFICATIONS} seconds have "
+                domain,
-                f"passed since last notification."
+                seconds_since_last,
+                _SECONDS_BETWEEN_NOTIFICATIONS,
             )
             return
 
-        # Record that we're sending a notification now
-        self._record_notification(domain)
-
         # Build the notification message
-        body_text = self._format_message(name, title, domain, tags, title_change)
+        body_text = self._format_message(
+            name, title, domain, tags, title_change=title_change
+        )
 
         # Send notifications to all subscribed rooms in parallel
         successful, failed = await self._broadcast_to_rooms(domain, body_text)
 
+        # Record that a notification was sent if at least one room received it.
+        if successful > 0:
+            self._record_notification(domain)
+
         # Log completion
         notification_type = "title change" if title_change else "going live"
         self.log.info(
-            f"[{domain}] Completed sending {notification_type} "
+            "[%s] Completed sending %s notifications! %s succeeded, %s failed.",
-            f"notifications! {successful} succeeded, "
+            domain,
-            f"{failed} failed."
+            notification_type,
+            successful,
+            failed,
         )
 
         self.metrics.record_delivery(
@@ -113,6 +128,76 @@ class NotificationService:
             failed=failed,
         )
 
+    async def send_cleanup_warning(self, domain: str) -> None:
+        """Send cleanup warning notification to all subscribed rooms.
+
+        :param domain: The stream domain.
+        """
+        remaining_days = _CLEANUP_DELETE_DAYS - _CLEANUP_WARNING_DAYS
+        body_text = (
+            "⚠️  Warning: Subscription Cleanup Scheduled\n\n"
+            f"The Owncast instance at {domain} has been "
+            f"unreachable for {_CLEANUP_WARNING_DAYS} days. If it remains "
+            f"unreachable for {remaining_days} more days "
+            f"({_CLEANUP_DELETE_DAYS} days total), this subscription "
+            f"will be automatically removed."
+        )
+
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
+        self.log.info(
+            "[%s] Sent cleanup warning to %s rooms (%s failed).",
+            domain,
+            successful,
+            failed,
+        )
+
+        self.metrics.record_delivery(
+            NotificationType.CLEANUP_WARNING, successful=successful, failed=failed
+        )
+
+    async def send_cleanup_deletion(self, domain: str) -> None:
+        """Send cleanup deletion notification to all subscribed rooms.
+
+        :param domain: The stream domain.
+        """
+        body_text = (
+            "🗑️  Subscription Automatically Removed\n\n"
+            f"The Owncast instance at {domain} has been "
+            f"unreachable for {_CLEANUP_DELETE_DAYS} days and has been "
+            f"automatically removed from subscriptions in this "
+            f"room.\n\n"
+            f"If the instance comes online again and you want to "
+            f"resubscribe, run `!subscribe {domain}`."
+        )
+
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
+        self.log.info(
+            "[%s] Sent cleanup deletion notice to %s rooms (%s failed).",
+            domain,
+            successful,
+            failed,
+        )
+
+        self.metrics.record_delivery(
+            NotificationType.CLEANUP_DELETION, successful=successful, failed=failed
+        )
+
+    def get_last_notification_time(self, domain: str) -> float:
+        """Get the cached live/title-change notification timestamp for a domain.
+
+        :param domain: The stream domain.
+        :return: Monotonic timestamp of the last successful live/title-change
+            notification, or 0 if none has been recorded.
+        """
+        return self.notification_timers_cache.get(domain, 0)
+
+    def clear_notification_state(self, domain: str) -> None:
+        """Clear cached notification state for a deleted domain.
+
+        :param domain: The stream domain to remove from local caches.
+        """
+        self.notification_timers_cache.pop(domain, None)
+
     async def _send_notification(
         self, room_id: str, body_text: str, domain: str
     ) -> None:
@@ -121,20 +206,28 @@ class NotificationService:
         :param room_id: The Matrix room ID to send to.
         :param body_text: The message body text.
         :param domain: The stream domain (for logging).
-        :raises Exception: If sending fails.
+        Propagates send errors so broadcast delivery accounting can count failures.
         """
         try:
             content = TextMessageEventContent(msgtype=MessageType.TEXT, body=body_text)
             await self.client.send_message(room_id, content)
         except Exception as exception:
             self.log.warning(
-                f"[{domain}] Failed to send notification "
+                "[%s] Failed to send notification message to room [%s]: %s",
-                f"message to room [{room_id}]: {exception}"
+                domain,
+                room_id,
+                exception,
             )
             raise
 
     def _format_message(
-        self, name: str, title: str, domain: str, tags: list[str], title_change: bool
+        self,
+        name: str,
+        title: str,
+        domain: str,
+        tags: Sequence[str],
+        *,
+        title_change: bool,
     ) -> str:
         """Format the notification message body.
 
@@ -147,7 +240,7 @@ class NotificationService:
         """
         # Use name if available, fallback to domain
         stream_name = name or domain
-        safe_stream_name = sanitize_for_plain_text(stream_name)
+        safe_stream_name = _sanitize_for_plain_text(stream_name)
 
         # Choose message based on notification type
         if title_change:
@@ -157,7 +250,7 @@ class NotificationService:
 
         # Add title if present
         if title:
-            safe_title = sanitize_for_plain_text(title)
+            safe_title = _sanitize_for_plain_text(title)
             parts.append(f"\nStream Title: {safe_title}")
 
         # Add stream URL
@@ -165,39 +258,30 @@ class NotificationService:
 
         # Add tags if present
         if tags:
-            safe_tags = [
+            tag_text = " ".join(
-                safe_tag
+                f"#{safe_tag}"
                 for tag in tags
-                if (safe_tag := sanitize_for_plain_text(tag))
+                if (safe_tag := _sanitize_for_plain_text(tag))
                 and not safe_tag.startswith(".")
-            ]
+            )
 
-            if safe_tags:
+            if tag_text:
-                parts.append(f"\n\n{' '.join(f'#{tag}' for tag in safe_tags)}")
+                parts.append(f"\n\n{tag_text}")
 
         return "".join(parts)
 
-    def get_last_notification_time(self, domain: str) -> float:
-        """Get the timestamp of the last notification sent for a domain.
-
-        :param domain: The stream domain.
-        :return: Unix timestamp of last notification, or 0 if never notified.
-        """
-        return self.notification_timers_cache.get(domain, 0)
-
     def _can_notify(self, domain: str) -> bool:
         """Check if enough time has passed to send another notification.
 
         :param domain: The stream domain.
         :return: True if notification can be sent, False otherwise.
         """
-        if domain not in self.notification_timers_cache:
+        last_notification_time = self.notification_timers_cache.get(domain)
-            return True
+        return (
-
+            last_notification_time is None
-        seconds_since_last = round(
+            or time.monotonic() - last_notification_time
-            time.monotonic() - self.notification_timers_cache[domain]
+            >= _SECONDS_BETWEEN_NOTIFICATIONS
         )
-        return seconds_since_last >= SECONDS_BETWEEN_NOTIFICATIONS
 
     def _record_notification(self, domain: str) -> None:
         """Record that a notification was sent at the current time.
@@ -218,55 +302,6 @@ class NotificationService:
             self._send_notification(room_id, body_text, domain) for room_id in room_ids
         ]
         results = await asyncio.gather(*tasks, return_exceptions=True)
-        failed = sum(1 for r in results if isinstance(r, Exception))
+        failed = sum(1 for r in results if isinstance(r, BaseException))
         successful = len(results) - failed
         return successful, failed
-
-    async def send_cleanup_warning(self, domain: str) -> None:
-        """Send cleanup warning notification to all subscribed rooms.
-
-        :param domain: The stream domain.
-        """
-        remaining_days = CLEANUP_DELETE_DAYS - CLEANUP_WARNING_DAYS
-        body_text = (
-            "⚠️  Warning: Subscription Cleanup Scheduled\n\n"
-            f"The Owncast instance at {domain} has been "
-            f"unreachable for {CLEANUP_WARNING_DAYS} days. If it remains "
-            f"unreachable for {remaining_days} more days "
-            f"({CLEANUP_DELETE_DAYS} days total), this subscription "
-            f"will be automatically removed."
-        )
-
-        successful, failed = await self._broadcast_to_rooms(domain, body_text)
-        self.log.info(
-            f"[{domain}] Sent cleanup warning to {successful} rooms ({failed} failed)."
-        )
-
-        self.metrics.record_delivery(
-            NotificationType.CLEANUP_WARNING, successful=successful, failed=failed
-        )
-
-    async def send_cleanup_deletion(self, domain: str) -> None:
-        """Send cleanup deletion notification to all subscribed rooms.
-
-        :param domain: The stream domain.
-        """
-        body_text = (
-            "🗑️  Subscription Automatically Removed\n\n"
-            f"The Owncast instance at {domain} has been "
-            f"unreachable for {CLEANUP_DELETE_DAYS} days and has been "
-            f"automatically removed from subscriptions in this "
-            f"room.\n\n"
-            f"If the instance comes online again and you want to "
-            f"resubscribe, run `!subscribe {domain}`."
-        )
-
-        successful, failed = await self._broadcast_to_rooms(domain, body_text)
-        self.log.info(
-            f"[{domain}] Sent cleanup deletion notice to "
-            f"{successful} rooms ({failed} failed)."
-        )
-
-        self.metrics.record_delivery(
-            NotificationType.CLEANUP_DELETION, successful=successful, failed=failed
-        )

owncastsentry/owncast_client.py

@@ -14,16 +14,16 @@
 
 """HTTP client for querying Owncast instance APIs."""
 
+import json
+from http import HTTPStatus
 from typing import TYPE_CHECKING, Any
 
 import aiohttp
 
-from .models import StreamConfig, StreamState
+from .types import (
-from .utils import (
+    InvalidApiResponseError,
-    OWNCAST_CONFIG_PATH,
+    StreamConfigObservation,
-    OWNCAST_STATUS_PATH,
+    StreamStateObservation,
-    REQUIRED_STATUS_FIELDS,
-    user_agent,
 )
 
 if TYPE_CHECKING:
@@ -32,6 +32,48 @@ if TYPE_CHECKING:
     from .metrics import MetricsService
 
 
+_OWNCAST_STATUS_PATH = "/api/status"
+_OWNCAST_CONFIG_PATH = "/api/config"
+_MAX_JSON_RESPONSE_BYTES = 1024 * 1024
+_JSON_READ_CHUNK_BYTES = 64 * 1024
+_HTTP_CONNECTION_LIMIT = 1000
+_HTTP_CONNECTION_LIMIT_PER_HOST = 1
+_HTTP_KEEPALIVE_TIMEOUT_SECONDS = 120
+_HTTP_CONNECT_TIMEOUT_SECONDS = 5
+_HTTP_READ_TIMEOUT_SECONDS = 5
+
+
+def _user_agent(version: str) -> str:
+    """Build the User-Agent header string for HTTP requests."""
+    return (
+        f"OwncastSentry/{version}"
+        " (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)"
+    )
+
+
+async def _read_limited_response_body(
+    response: aiohttp.ClientResponse,
+) -> bytearray | None:
+    """Read a response body while enforcing the maximum JSON response size."""
+    # Check Content-Length first when the server provides it so clearly
+    # oversized responses can be rejected before buffering any body bytes.
+    if (
+        response.content_length is not None
+        and response.content_length > _MAX_JSON_RESPONSE_BYTES
+    ):
+        return None
+
+    body = bytearray()
+    # Read until EOF instead of using one read(n) call. aiohttp's read(n)
+    # may return a partial body as soon as data is available.
+    async for chunk in response.content.iter_chunked(_JSON_READ_CHUNK_BYTES):
+        body.extend(chunk)
+        if len(body) > _MAX_JSON_RESPONSE_BYTES:
+            return None
+
+    return body
+
+
 class OwncastClient:
     """HTTP client for communicating with Owncast instances."""
 
@@ -51,15 +93,18 @@ class OwncastClient:
         self.metrics = metrics
 
         # Set up HTTP session configuration
-        headers = {"User-Agent": user_agent(version)}
+        headers = {"User-Agent": _user_agent(version)}
         cookie_jar = aiohttp.DummyCookieJar()
         connector = aiohttp.TCPConnector(
             use_dns_cache=False,
-            limit=1000,
+            limit=_HTTP_CONNECTION_LIMIT,
-            limit_per_host=1,
+            limit_per_host=_HTTP_CONNECTION_LIMIT_PER_HOST,
-            keepalive_timeout=120,
+            keepalive_timeout=_HTTP_KEEPALIVE_TIMEOUT_SECONDS,
+        )
+        timeout = aiohttp.ClientTimeout(
+            sock_connect=_HTTP_CONNECT_TIMEOUT_SECONDS,
+            sock_read=_HTTP_READ_TIMEOUT_SECONDS,
         )
-        timeout = aiohttp.ClientTimeout(sock_connect=5, sock_read=5)
 
         self.session = aiohttp.ClientSession(
             headers=headers,
@@ -68,83 +113,68 @@ class OwncastClient:
             connector=connector,
         )
 
-    async def _fetch_json(self, domain: str, path: str) -> dict[str, Any] | None:
+    async def get_stream_state(self, domain: str) -> StreamStateObservation | None:
-        """Fetch and parse JSON from an Owncast API endpoint.
-
-        :param domain: The domain to query.
-        :param path: The API path to request.
-        :return: Parsed JSON response, or None on error.
-        """
-        url = f"https://{domain}{path}"
-        try:
-            async with self.session.get(url, allow_redirects=False) as response:
-                if response.status != 200:
-                    self.log.warning(
-                        f"[{domain}] Response to request on "
-                        f"{path} was not 200, "
-                        f"got {response.status} instead."
-                    )
-                    return None
-                try:
-                    result: dict[str, Any] = await response.json()
-                    return result
-                except (ValueError, aiohttp.ContentTypeError) as e:
-                    self.log.warning(
-                        f"[{domain}] Rejecting response to request on "
-                        f"{path} as could not be "
-                        f"interpreted as JSON: {e}"
-                    )
-                    return None
-        except (aiohttp.ClientError, TimeoutError, OSError) as e:
-            self.log.warning(f"[{domain}] Error making GET request to {path}: {e}")
-            return None
-
-    async def get_stream_state(self, domain: str) -> StreamState | None:
         """Get the current stream state for a given domain.
 
         HTTPS on port 443 is assumed, no other protocols or ports
         are supported.
 
         :param domain: The domain (not URL) where the stream is hosted.
-        :return: A StreamState if available, None on error.
+        :return: A StreamStateObservation if available, None on error.
         """
-        self.log.debug(f"[{domain}] Fetching current stream state...")
+        self.log.debug("[%s] Fetching current stream state...", domain)
         with self.metrics.response_timer(domain) as timer:
-            new_state = await self._fetch_json(domain, OWNCAST_STATUS_PATH)
+            new_state = await self._fetch_json(domain, _OWNCAST_STATUS_PATH)
 
             if new_state is None:
                 return None
 
-            # Validate the response contains all basic info needed
+            try:
-            missing = REQUIRED_STATUS_FIELDS - new_state.keys()
+                stream_observation = StreamStateObservation.from_api_response(
-            if missing:
+                    new_state, domain
+                )
+            except InvalidApiResponseError as e:
                 self.log.warning(
-                    f"[{domain}] Rejecting response to request on "
+                    "[%s] Rejecting response to request on %s as response "
-                    f"{OWNCAST_STATUS_PATH} as it is missing "
+                    "shape is invalid: %s",
-                    f"fields: {', '.join(sorted(missing))}"
+                    domain,
+                    _OWNCAST_STATUS_PATH,
+                    e,
                 )
                 return None
 
             timer.success()
-            return StreamState.from_api_response(new_state, domain)
+            return stream_observation
 
-    async def get_stream_config(self, domain: str) -> StreamConfig | None:
+    async def get_stream_config(self, domain: str) -> StreamConfigObservation | None:
         """Get the current stream config for a given domain.
 
         HTTPS on port 443 is assumed, no other protocols or ports
         are supported.
 
         :param domain: The domain (not URL) where the stream is hosted.
-        :return: A StreamConfig, or None if fetch failed.
+        :return: A StreamConfigObservation, or None if fetch failed.
         """
-        self.log.debug(f"[{domain}] Fetching current stream config...")
+        self.log.debug("[%s] Fetching current stream config...", domain)
         with self.metrics.response_timer(domain) as timer:
-            config = await self._fetch_json(domain, OWNCAST_CONFIG_PATH)
+            config = await self._fetch_json(domain, _OWNCAST_CONFIG_PATH)
             if config is None:
                 return None
 
+            try:
+                stream_config = StreamConfigObservation.from_api_response(config)
+            except InvalidApiResponseError as e:
+                self.log.warning(
+                    "[%s] Rejecting response to request on %s as response "
+                    "shape is invalid: %s",
+                    domain,
+                    _OWNCAST_CONFIG_PATH,
+                    e,
+                )
+                return None
+
             timer.success()
-            return StreamConfig.from_api_response(config)
+            return stream_config
 
     async def validate_instance(self, domain: str) -> bool:
         """Validate that a domain is a valid Owncast instance.
@@ -161,10 +191,67 @@ class OwncastClient:
         connector = self.session.connector
         if connector is None:
             return 0
-        idle = sum(len(conns) for conns in connector._conns.values())
+
-        active = len(connector._acquired)
+        # aiohttp does not expose public live pool counts; this metric intentionally
+        # mirrors its internal idle and active connection pools.
+        idle = sum(len(conns) for conns in connector._conns.values())  # noqa: SLF001
+        active = len(connector._acquired)  # noqa: SLF001
         return idle + active
 
     async def close(self) -> None:
         """Close the HTTP session."""
         await self.session.close()
+
+    async def _fetch_json(self, domain: str, path: str) -> dict[str, Any] | None:
+        """Fetch and parse JSON from an Owncast API endpoint.
+
+        :param domain: The domain to query.
+        :param path: The API path to request.
+        :return: Parsed JSON response, or None on error.
+        """
+        url = f"https://{domain}{path}"
+        try:
+            async with self.session.get(url, allow_redirects=False) as response:
+                if response.status != HTTPStatus.OK:
+                    self.log.warning(
+                        "[%s] Response to request on %s was not 200, got %s instead.",
+                        domain,
+                        path,
+                        response.status,
+                    )
+                    return None
+                try:
+                    body = await _read_limited_response_body(response)
+                    if body is None:
+                        self.log.warning(
+                            "[%s] Rejecting response to request on %s as it "
+                            "was larger than %s bytes.",
+                            domain,
+                            path,
+                            _MAX_JSON_RESPONSE_BYTES,
+                        )
+                        return None
+
+                    result = json.loads(body)
+                    if not isinstance(result, dict):
+                        self.log.warning(
+                            "[%s] Rejecting response to request on %s as JSON "
+                            "was not an object.",
+                            domain,
+                            path,
+                        )
+                        return None
+                except ValueError as e:
+                    self.log.warning(
+                        "[%s] Rejecting response to request on %s as could not "
+                        "be interpreted as JSON: %s",
+                        domain,
+                        path,
+                        e,
+                    )
+                    return None
+                else:
+                    return result
+        except (aiohttp.ClientError, TimeoutError, OSError) as e:
+            self.log.warning("[%s] Error making GET request to %s: %s", domain, path, e)
+            return None

owncastsentry/repository.py

@@ -0,0 +1,493 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Repository and schema upgrade definitions for OwncastSentry.
+
+Only SQLite is supported as a database backend for now.
+"""
+
+from datetime import UTC, datetime
+from typing import TYPE_CHECKING, Any
+
+from mautrix.util.async_db import Connection, UpgradeTable
+
+from .types import (
+    UNKNOWN_STATUS_THRESHOLD,
+    AlreadySubscribedError,
+    NotSubscribedError,
+    RoomSubscription,
+    StreamState,
+    format_status_since,
+)
+
+if TYPE_CHECKING:
+    from mautrix.util.async_db import Database
+
+
+upgrade_table = UpgradeTable()
+
+
+class _Unset:
+    """Sentinel type for omitted partial stream update fields."""
+
+    __slots__ = ()
+
+
+_UNSET = _Unset()
+
+
+def _normalize_legacy_status_since(value: Any) -> str | None:
+    """Normalize a legacy timestamp value to the canonical UTC format."""
+    if value is None:
+        return None
+    if isinstance(value, datetime):
+        parsed = value
+    elif isinstance(value, str):
+        value = value.strip()
+        if not value:
+            return None
+        try:
+            parsed = datetime.fromisoformat(value)
+        except ValueError:
+            return None
+    else:
+        return None
+
+    if parsed.tzinfo is None:
+        return None
+    return format_status_since(parsed.astimezone(UTC))
+
+
+@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
+    description="Initial revision"
+)
+async def upgrade_v1(conn: Connection) -> None:
+    """Create the initial database schema.
+
+    Creates the streams and subscriptions tables.
+
+    :param conn: A connection to run the v1 database migration on.
+    """
+    await conn.execute(
+        """CREATE TABLE "streams" (
+            "domain"    TEXT NOT NULL UNIQUE,
+            "name"  TEXT,
+            "title" TEXT,
+            "last_connect_time" TEXT,
+            "last_disconnect_time"  TEXT,
+            PRIMARY KEY("domain")
+        )"""
+    )
+
+    await conn.execute(
+        """CREATE TABLE "subscriptions" (
+            "stream_domain" INTEGER NOT NULL,
+            "room_id"   TEXT NOT NULL,
+            UNIQUE("room_id","stream_domain")
+        )"""
+    )
+
+
+@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
+    description="Fix stream_domain column type from INTEGER to TEXT"
+)
+async def upgrade_v2(conn: Connection) -> None:
+    """Upgrade database schema to version 2 format.
+
+    Fixes the stream_domain column type in the subscriptions table
+    from INTEGER to TEXT.
+
+    :param conn: A connection to run the v2 database migration on.
+    """
+    await conn.execute(
+        """CREATE TABLE "subscriptions_new" (
+            "stream_domain" TEXT NOT NULL,
+            "room_id"   TEXT NOT NULL,
+            UNIQUE("room_id","stream_domain")
+        )"""
+    )
+
+    await conn.execute(
+        """INSERT INTO subscriptions_new (stream_domain, room_id)
+           SELECT stream_domain, room_id FROM subscriptions"""
+    )
+
+    await conn.execute("DROP TABLE subscriptions")
+    await conn.execute("ALTER TABLE subscriptions_new RENAME TO subscriptions")
+
+
+@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
+    description="Add failure_counter column for backoff and auto-cleanup"
+)
+async def upgrade_v3(conn: Connection) -> None:
+    """Upgrade database schema to version 3 format.
+
+    Adds the failure_counter column to track connection failures
+    for backoff and auto-cleanup.
+
+    :param conn: A connection to run the v3 database migration on.
+    """
+    await conn.execute(
+        """ALTER TABLE streams ADD COLUMN failure_counter INTEGER DEFAULT 0"""
+    )
+
+
+@upgrade_table.register(  # type: ignore[arg-type, call-arg, untyped-decorator]
+    description="Store online status and current status timestamp"
+)
+async def upgrade_v4(conn: Connection) -> None:
+    """Upgrade database schema to version 4 format.
+
+    Replaces separate connect and disconnect timestamp columns with an
+    authoritative online flag and a timestamp for the current status.
+
+    :param conn: A connection to run the v4 database migration on.
+    """
+    await conn.execute(
+        """CREATE TABLE "streams_new" (
+            "domain"    TEXT NOT NULL UNIQUE,
+            "name"  TEXT,
+            "title" TEXT,
+            "online" BOOLEAN NOT NULL DEFAULT false,
+            "status_since" TEXT,
+            "failure_counter" INTEGER DEFAULT 0,
+            PRIMARY KEY("domain")
+        )"""
+    )
+
+    rows = await conn.fetch(
+        """SELECT domain, name, title, last_connect_time, last_disconnect_time,
+                  failure_counter
+           FROM streams"""
+    )
+    for row in rows:
+        last_connect_time = row["last_connect_time"]
+        online = last_connect_time is not None and str(last_connect_time).strip() != ""
+        legacy_timestamp = last_connect_time if online else row["last_disconnect_time"]
+        await conn.execute(
+            """INSERT INTO streams_new (
+                   domain, name, title, online, status_since, failure_counter
+               )
+               VALUES ($1, $2, $3, $4, $5, $6)""",
+            row["domain"],
+            row["name"],
+            row["title"],
+            online,
+            _normalize_legacy_status_since(legacy_timestamp),
+            row["failure_counter"],
+        )
+
+    await conn.execute("DROP TABLE streams")
+    await conn.execute("ALTER TABLE streams_new RENAME TO streams")
+
+
+def get_upgrade_table() -> UpgradeTable:
+    """Return the repository upgrade table with registered migrations."""
+    return upgrade_table
+
+
+class StreamRepository:
+    """Repository for managing stream data in the database."""
+
+    def __init__(self, database: Database) -> None:
+        """Initialize the stream repository.
+
+        :param database: The maubot database instance.
+        """
+        self.db: Any = database
+
+    async def create(self, domain: str) -> bool:
+        """Create a new stream entry in the database.
+
+        :param domain: The stream domain.
+        :return: True if created, False if the stream already existed.
+        """
+        query = """INSERT INTO streams (domain)
+                   VALUES ($1)
+                   ON CONFLICT (domain) DO NOTHING"""
+        async with self.db.acquire() as conn:
+            result = await conn.execute(query, domain)
+            return int(result.rowcount) > 0
+
+    async def get_by_domain(self, domain: str) -> StreamState | None:
+        """Get a stream's state by domain.
+
+        :param domain: The stream domain.
+        :return: StreamState if found, None otherwise.
+        """
+        query = "SELECT * FROM streams WHERE domain=$1"
+        async with self.db.acquire() as conn:
+            row = await conn.fetchrow(query, domain)
+            return StreamState.from_db_row(row) if row else None
+
+    async def exists(self, domain: str) -> bool:
+        """Check if a stream exists in the database.
+
+        :param domain: The stream domain.
+        :return: True if exists, False otherwise.
+        """
+        result = await self.get_by_domain(domain)
+        return result is not None
+
+    async def update(
+        self,
+        domain: str,
+        *,
+        name: str | None | _Unset = _UNSET,
+        title: str | None | _Unset = _UNSET,
+        online: bool | _Unset = _UNSET,
+        status_since: str | None | _Unset = _UNSET,
+    ) -> None:
+        """Update only the supplied stream fields in the database.
+
+        Passing None writes NULL for nullable fields. Omitting a field leaves
+        that column unchanged.
+
+        :param domain: The stream domain.
+        :param name: Optional stream display name update.
+        :param title: Optional stream title update.
+        :param online: Optional stream online state update.
+        :param status_since: Optional current status timestamp update.
+        """
+        # _UNSET marks omitted fields so None can still be written as SQL NULL.
+        update_name = not isinstance(name, _Unset)
+        update_title = not isinstance(title, _Unset)
+        update_online = not isinstance(online, _Unset)
+        update_status_since = not isinstance(status_since, _Unset)
+
+        if not (update_name or update_title or update_online or update_status_since):
+            return
+
+        name_value = None if isinstance(name, _Unset) else name
+        title_value = None if isinstance(title, _Unset) else title
+        online_value = None if isinstance(online, _Unset) else online
+        status_since_value = None if isinstance(status_since, _Unset) else status_since
+
+        # SQLite's IS NOT gives null-safe comparisons for the supported backend.
+        query = """UPDATE streams
+                   SET name = CASE WHEN $1 THEN $2 ELSE name END,
+                       title = CASE WHEN $3 THEN $4 ELSE title END,
+                       online = CASE WHEN $5 THEN $6 ELSE online END,
+                       status_since = CASE WHEN $7 THEN $8 ELSE status_since END
+                   WHERE domain=$9
+                     AND (($1 AND name IS NOT $2)
+                          OR ($3 AND title IS NOT $4)
+                          OR ($5 AND online IS NOT $6)
+                          OR ($7 AND status_since IS NOT $8))"""
+        async with self.db.acquire() as conn:
+            await conn.execute(
+                query,
+                update_name,
+                name_value,
+                update_title,
+                title_value,
+                update_online,
+                online_value,
+                update_status_since,
+                status_since_value,
+                domain,
+            )
+
+    async def delete(self, domain: str) -> None:
+        """Delete a stream record from the database.
+
+        :param domain: The stream domain.
+        """
+        query = "DELETE FROM streams WHERE domain=$1"
+        async with self.db.acquire() as conn:
+            await conn.execute(query, domain)
+
+    async def increment_failure_counter(self, domain: str) -> None:
+        """Increment the failure counter for a stream by 1.
+
+        :param domain: The stream domain.
+        """
+        query = """UPDATE streams
+                   SET failure_counter = failure_counter + 1
+                   WHERE domain=$1"""
+        async with self.db.acquire() as conn:
+            await conn.execute(query, domain)
+
+    async def reset_failure_counter(self, domain: str) -> None:
+        """Reset the failure counter for a stream to 0.
+
+        :param domain: The stream domain.
+        """
+        query = """UPDATE streams
+                   SET failure_counter = 0
+                   WHERE domain=$1 AND failure_counter != 0"""
+        async with self.db.acquire() as conn:
+            await conn.execute(query, domain)
+
+
+class SubscriptionRepository:
+    """Repository for managing stream subscriptions in the database."""
+
+    def __init__(self, database: Database) -> None:
+        """Initialize the subscription repository.
+
+        :param database: The maubot database instance.
+        """
+        self.db: Any = database
+
+    async def add(self, domain: str, room_id: str) -> None:
+        """Add a subscription for a room to a stream.
+
+        :param domain: The stream domain.
+        :param room_id: The Matrix room ID.
+        :raises AlreadySubscribedError: If subscription already exists.
+        """
+        query = """INSERT INTO subscriptions (stream_domain, room_id)
+                   VALUES ($1, $2)
+                   ON CONFLICT (room_id, stream_domain) DO NOTHING"""
+        async with self.db.acquire() as conn:
+            result = await conn.execute(query, domain, room_id)
+            if int(result.rowcount) == 0:
+                raise AlreadySubscribedError(domain)
+
+    async def remove(self, domain: str, room_id: str) -> None:
+        """Remove a subscription for a room from a stream.
+
+        :param domain: The stream domain.
+        :param room_id: The Matrix room ID.
+        :raises NotSubscribedError: If no subscription exists.
+        """
+        query = "DELETE FROM subscriptions WHERE stream_domain=$1 AND room_id=$2"
+        async with self.db.acquire() as conn:
+            result = await conn.execute(query, domain, room_id)
+            if int(result.rowcount) == 0:
+                raise NotSubscribedError(domain)
+
+    async def delete_all_for_domain(self, domain: str) -> int:
+        """Delete all subscriptions for a given stream domain.
+
+        :param domain: The stream domain.
+        :return: Number of subscriptions deleted.
+        """
+        query = "DELETE FROM subscriptions WHERE stream_domain=$1"
+        async with self.db.acquire() as conn:
+            result = await conn.execute(query, domain)
+            return int(result.rowcount)
+
+    async def get_subscribed_rooms(self, domain: str) -> list[str]:
+        """Get all room IDs subscribed to a stream.
+
+        :param domain: The stream domain.
+        :return: List of room IDs.
+        """
+        query = "SELECT room_id FROM subscriptions WHERE stream_domain=$1"
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query, domain)
+            return [row["room_id"] for row in results]
+
+    async def get_subscribed_streams_for_room(self, room_id: str) -> list[str]:
+        """Get all stream domains that a room is subscribed to.
+
+        :param room_id: The Matrix room ID.
+        :return: List of stream domains.
+        """
+        query = "SELECT stream_domain FROM subscriptions WHERE room_id=$1"
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query, room_id)
+            return [row["stream_domain"] for row in results]
+
+    async def has_room_subscriptions(self, room_id: str) -> bool:
+        """Check whether a room has any subscriptions."""
+        query = "SELECT 1 FROM subscriptions WHERE room_id=$1 LIMIT 1"
+        async with self.db.acquire() as conn:
+            result = await conn.fetchrow(query, room_id)
+            return result is not None
+
+    async def get_room_subscriptions(self, room_id: str) -> list[RoomSubscription]:
+        """Get resolved stream subscriptions for a room ordered by domain.
+
+        :param room_id: The Matrix room ID.
+        :return: Subscriptions with stream state attached.
+        """
+        query = """SELECT streams.*
+                   FROM subscriptions
+                   JOIN streams ON streams.domain = subscriptions.stream_domain
+                   WHERE subscriptions.room_id=$1
+                   ORDER BY streams.domain"""
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query, room_id)
+            return [
+                RoomSubscription(
+                    domain=row["domain"],
+                    stream_state=StreamState.from_db_row(row),
+                )
+                for row in results
+            ]
+
+    async def get_live_room_subscriptions(self, room_id: str) -> list[RoomSubscription]:
+        """Get resolved live stream subscriptions for a room ordered by domain."""
+        query = """SELECT streams.*
+                   FROM subscriptions
+                   JOIN streams ON streams.domain = subscriptions.stream_domain
+                   WHERE subscriptions.room_id=$1
+                     AND streams.online=true
+                     AND streams.failure_counter <= $2
+                   ORDER BY streams.domain"""
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query, room_id, UNKNOWN_STATUS_THRESHOLD)
+            return [
+                RoomSubscription(
+                    domain=row["domain"],
+                    stream_state=StreamState.from_db_row(row),
+                )
+                for row in results
+            ]
+
+    async def get_all_subscribed_domains(self) -> list[str]:
+        """Get all unique stream domains that have at least one subscription.
+
+        :return: List of stream domains.
+        """
+        query = "SELECT DISTINCT stream_domain FROM subscriptions"
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query)
+            return [row["stream_domain"] for row in results]
+
+    async def count_by_domain(self, domain: str) -> int:
+        """Count the number of subscriptions for a given stream domain.
+
+        :param domain: The stream domain.
+        :return: Number of subscriptions.
+        """
+        query = "SELECT COUNT(*) FROM subscriptions WHERE stream_domain=$1"
+        async with self.db.acquire() as conn:
+            result = await conn.fetchrow(query, domain)
+            return int(result[0])
+
+    async def count_by_domains(self, domains: list[str]) -> dict[str, int]:
+        """Count subscriptions for each requested stream domain.
+
+        :param domains: The stream domains to count subscriptions for.
+        :return: Mapping from each requested domain to its subscription count.
+        """
+        if not domains:
+            return {}
+
+        counts = dict.fromkeys(domains, 0)
+        query = """SELECT stream_domain, COUNT(*) AS subscription_count
+                   FROM subscriptions
+                   GROUP BY stream_domain"""
+        async with self.db.acquire() as conn:
+            results = await conn.fetch(query)
+
+        for row in results:
+            domain = row["stream_domain"]
+            if domain in counts:
+                counts[domain] = int(row["subscription_count"])
+        return counts

owncastsentry/stream_monitor.py

@@ -16,23 +16,149 @@
 
 import asyncio
 import time
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from enum import Enum, auto
 from typing import TYPE_CHECKING
 
-from .models import StreamState, StreamStatus, UpdateResult
+from .types import (
-from .utils import (
+    StreamConfigObservation,
-    CLEANUP_DELETE_THRESHOLD,
+    StreamState,
-    CLEANUP_WARNING_THRESHOLD,
+    StreamStateObservation,
-    TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN,
+    StreamStatus,
-    should_query_stream,
+    UpdateResult,
 )
 
 if TYPE_CHECKING:
     import logging
 
-    from .database import StreamRepository, SubscriptionRepository
     from .metrics import MetricsService
     from .notification_service import NotificationService
     from .owncast_client import OwncastClient
+    from .repository import StreamRepository, SubscriptionRepository
+
+
+_TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN = 7 * 60
+
+_CLEANUP_WARNING_THRESHOLD = 83 * 24 * 60
+_CLEANUP_DELETE_THRESHOLD = 90 * 24 * 60
+_QUERY_EVERY_MINUTE_FAILURE_LIMIT = 4
+_QUERY_EVERY_2_MINUTES_FAILURE_LIMIT = 9
+_QUERY_EVERY_3_MINUTES_FAILURE_LIMIT = 14
+_QUERY_EVERY_5_MINUTES_FAILURE_LIMIT = 29
+_QUERY_EVERY_2_MINUTES_INTERVAL = 2
+_QUERY_EVERY_3_MINUTES_INTERVAL = 3
+_QUERY_EVERY_5_MINUTES_INTERVAL = 5
+_QUERY_EVERY_15_MINUTES_INTERVAL = 15
+
+
+def _should_query_stream(failure_counter: int) -> bool:
+    """Determine if a stream should be queried based on failure count."""
+    if failure_counter <= _QUERY_EVERY_MINUTE_FAILURE_LIMIT:
+        return True
+    if failure_counter <= _QUERY_EVERY_2_MINUTES_FAILURE_LIMIT:
+        return failure_counter % _QUERY_EVERY_2_MINUTES_INTERVAL == 0
+    if failure_counter <= _QUERY_EVERY_3_MINUTES_FAILURE_LIMIT:
+        return failure_counter % _QUERY_EVERY_3_MINUTES_INTERVAL == 0
+    if failure_counter <= _QUERY_EVERY_5_MINUTES_FAILURE_LIMIT:
+        return failure_counter % _QUERY_EVERY_5_MINUTES_INTERVAL == 0
+    return failure_counter % _QUERY_EVERY_15_MINUTES_INTERVAL == 0
+
+
+class _StreamTransitionKind(Enum):
+    """High-level status transition from stored state to fresh observation."""
+
+    FIRST_OBSERVATION = auto()
+    WENT_LIVE = auto()
+    WENT_OFFLINE = auto()
+    TITLE_CHANGED = auto()
+    STATUS_UNCHANGED = auto()
+
+
+@dataclass(frozen=True, slots=True)
+class _StreamTransition:
+    """Classified stream transition and timestamp metadata."""
+
+    kind: _StreamTransitionKind
+    status_since: str | None
+
+
+class _NotificationKind(Enum):
+    """Live/title notification action for a transition."""
+
+    NONE = auto()
+    LIVE = auto()
+    TITLE_CHANGE = auto()
+
+    @property
+    def should_notify(self) -> bool:
+        """Return whether a live/title-change notification should be attempted."""
+        return self is not _NotificationKind.NONE
+
+
+def _classify_transition(
+    old_state: StreamState, observation: StreamStateObservation
+) -> _StreamTransition:
+    """Classify the transition from the stored state to the latest observation."""
+    if old_state.status_since is None:
+        return _StreamTransition(
+            kind=_StreamTransitionKind.FIRST_OBSERVATION,
+            status_since=observation.observed_at,
+        )
+
+    if old_state.online != observation.online:
+        return _StreamTransition(
+            kind=(
+                _StreamTransitionKind.WENT_LIVE
+                if observation.online
+                else _StreamTransitionKind.WENT_OFFLINE
+            ),
+            status_since=observation.observed_at,
+        )
+
+    if old_state.online and old_state.title != observation.title:
+        return _StreamTransition(
+            kind=_StreamTransitionKind.TITLE_CHANGED,
+            status_since=old_state.status_since,
+        )
+
+    return _StreamTransition(
+        kind=_StreamTransitionKind.STATUS_UNCHANGED,
+        status_since=old_state.status_since,
+    )
+
+
+def _classify_notification(
+    transition: _StreamTransition,
+    old_state: StreamState,
+    observation: StreamStateObservation,
+    *,
+    offline_duration_seconds: int | None = None,
+    went_offline_after_last_notification: bool = False,
+) -> _NotificationKind:
+    """Classify the live/title notification policy for a transition.
+
+    The caller supplies timing context because it comes from the monitor's
+    monotonic offline cache and notification-service cache, not the transition.
+    """
+    match transition.kind:
+        case _StreamTransitionKind.WENT_LIVE:
+            if offline_duration_seconds is not None and (
+                offline_duration_seconds < _TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN
+            ):
+                if old_state.title != observation.title:
+                    return _NotificationKind.TITLE_CHANGE
+                return _NotificationKind.NONE
+
+            return _NotificationKind.LIVE
+
+        case _StreamTransitionKind.TITLE_CHANGED:
+            if went_offline_after_last_notification:
+                return _NotificationKind.LIVE
+            return _NotificationKind.TITLE_CHANGE
+
+        case _:
+            return _NotificationKind.NONE
 
 
 class StreamMonitor:
@@ -79,8 +205,7 @@ class StreamMonitor:
 
         total_streams = len(subscribed_domains)
 
-        # Build a list of async tasks for each stream domain
+        # Run all stream updates concurrently and collect results.
-        # Run all stream updates in parallel and collect results
         results = await asyncio.gather(
             *(self.update_stream(domain) for domain in subscribed_domains),
             return_exceptions=True,
@@ -92,7 +217,8 @@ class StreamMonitor:
         for domain, result in zip(subscribed_domains, results, strict=True):
             if isinstance(result, BaseException):
                 self.log.exception(
-                    f"[{domain}] Unhandled exception during stream update.",
+                    "[%s] Unhandled exception during stream update.",
+                    domain,
                     exc_info=result,
                 )
                 failed_checks += 1
@@ -102,13 +228,19 @@ class StreamMonitor:
                 failed_checks += 1
 
         self.log.debug(
-            f"Update complete. {successful_checks}/{total_streams} succeeded, "
+            "Update complete. %s/%s succeeded, %s failed.",
-            f"{failed_checks} failed."
+            successful_checks,
+            total_streams,
+            failed_checks,
         )
 
+        subscription_counts = await self.subscription_repo.count_by_domains(
+            subscribed_domains
+        )
         for domain in subscribed_domains:
-            count = await self.subscription_repo.count_by_domain(domain)
+            self.metrics.set_subscription_count(
-            self.metrics.set_subscription_count(domain, count)
+                domain, subscription_counts.get(domain, 0)
+            )
 
         return UpdateResult(
             total_streams=total_streams,
@@ -119,9 +251,9 @@ class StreamMonitor:
     async def update_stream(self, domain: str) -> bool:
         """Update the state of a stream and send notifications as needed.
 
-        Sends notifications to subscribed Matrix rooms if a stream goes
+        Sends notifications to subscribed Matrix rooms when a stream goes
-        live. Implements progressive backoff for connection failures and
+        live or changes title. Implements progressive backoff for connection
-        auto-cleanup for dead instances.
+        failures and auto-cleanup for dead instances.
 
         :param domain: The domain of the stream to update.
         :return: True if check succeeded or was skipped, False on failure.
@@ -134,12 +266,13 @@ class StreamMonitor:
             return True
 
         # Check if we should query this stream based on backoff schedule
-        if not should_query_stream(failure_counter):
+        if not _should_query_stream(failure_counter):
             # Skip this cycle, increment counter to track time passage
             await self.stream_repo.increment_failure_counter(domain)
             self.log.debug(
-                f"[{domain}] Skipping query due to backoff "
+                "[%s] Skipping query due to backoff (counter=%s)",
-                f"(counter={failure_counter + 1})"
+                domain,
+                failure_counter + 1,
             )
             # Check cleanup thresholds even when skipping query
             await self._check_cleanup_thresholds(domain, failure_counter + 1)
@@ -150,25 +283,16 @@ class StreamMonitor:
             # Backoff is expected behavior, not a failure
             return True
 
-        # Flag: first state update of a brand-new stream to avoid
-        # sending notifications if it's already live.
-        first_update = False
-
-        # Flag: whether to update the stream's state in the database.
-        # Used to avoid writes when state hasn't changed at all.
-        update_database = False
-
-        # The stream's latest configuration, if fetched during update.
-        stream_config = None
-
         # Fetch the latest stream state from the server
-        new_state = await self.owncast_client.get_stream_state(domain)
+        observation = await self.owncast_client.get_stream_state(domain)
 
         # If the fetch failed, increment failure counter and skip the update
-        if new_state is None:
+        if observation is None:
             await self.stream_repo.increment_failure_counter(domain)
             self.log.warning(
-                f"[{domain}] Connection failure (counter={failure_counter + 1})"
+                "[%s] Connection failure (counter=%s)",
+                domain,
+                failure_counter + 1,
             )
             # Check cleanup thresholds after connection failure
             await self._check_cleanup_thresholds(domain, failure_counter + 1)
@@ -186,153 +310,108 @@ class StreamMonitor:
         # Initialize timer cache entries to prevent KeyError on first access
         self.offline_timer_cache.setdefault(domain, 0)
 
-        # Does the last known stream state lack connect/disconnect?
+        transition = _classify_transition(old_state, observation)
-        if (
+        # Notification policy may need runtime timing context in addition to
-            old_state.last_connect_time is None
+        # the stored state and latest observation.
-            and old_state.last_disconnect_time is None
+        offline_duration_seconds: int | None = None
-        ):
+        went_offline_after_last_notification = False
-            # Yes, this is the first update. Don't send any notifications.
-            update_database = True
-            first_update = True
 
-        # Does the new state have a connect time but the old one not?
+        match transition.kind:
-        if (
+            case _StreamTransitionKind.FIRST_OBSERVATION:
-            new_state.last_connect_time is not None
+                self.log.info(
-            and old_state.last_connect_time is None
+                    "[%s] Not sending notifications. This is the first state "
-        ):
+                    "update for this stream.",
-            # Yes! This stream is now live.
+                    domain,
-            update_database = True
+                )
-            stream_config = await self.owncast_client.get_stream_config(domain)
+            case _StreamTransitionKind.WENT_LIVE:
-
+                self.log.info("[%s] Stream is now live!", domain)
-            self.log.info(f"[{domain}] Stream is now live!")
+                offline_duration_seconds = round(
-
-            # Calculate seconds since the stream last went offline
-            seconds_since_last_offline = round(
                     time.monotonic() - self.offline_timer_cache[domain]
                 )
-
+                # Brief reconnects with the same title are treated as transient
-            # Have we queried this stream before?
+                # outages, not new live events.
-            if not first_update:
-                # Use fallback values if config fetch failed
-                stream_name = stream_config.name if stream_config else domain
-                stream_tags = stream_config.tags if stream_config else []
-
-                # Has this stream been offline for a short time?
-                if seconds_since_last_offline < TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN:
-                    # Did the stream title change?
-                    if old_state.title != new_state.title:
-                        # Stream was briefly down; send title
-                        # change notification.
-                        await self.notification_service.notify_stream_live(
-                            domain,
-                            stream_name,
-                            new_state.title or "",
-                            stream_tags,
-                            title_change=True,
-                        )
-                    else:
-                        # Briefly offline, no title change. Skip.
-                        self.log.info(
-                            f"[{domain}] Not sending "
-                            f"notifications. Stream was only "
-                            f"offline for "
-                            f"{seconds_since_last_offline} of "
-                            f"{TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN}"
-                            f" seconds and did not change its "
-                            f"title."
-                        )
-                else:
-                    # Offline for a while. Send a normal notification.
-                    await self.notification_service.notify_stream_live(
-                        domain,
-                        stream_name,
-                        new_state.title or "",
-                        stream_tags,
-                        title_change=False,
-                    )
-            else:
-                # No, this is the first time we're querying
-                self.log.info(
-                    f"[{domain}] Not sending notifications. "
-                    f"This is the first state update for "
-                    f"this stream."
-                )
-
                 if (
-            new_state.last_connect_time is not None
+                    offline_duration_seconds < _TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN
-            and old_state.last_connect_time is not None
+                    and old_state.title == observation.title
                 ):
-            # Did the stream title change mid-session?
+                    self.log.info(
-            if old_state.title != new_state.title:
+                        "[%s] Not sending notifications. Stream was only offline for "
-                self.log.info(f"[{domain}] Stream title was changed!")
+                        "%s of %s seconds and did not change its title.",
-                update_database = True
+                        domain,
+                        offline_duration_seconds,
+                        _TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN,
+                    )
+            case _StreamTransitionKind.TITLE_CHANGED:
+                self.log.info("[%s] Stream title was changed!", domain)
+                # If we saw an offline event after the last notification, send
+                # a go-live notice instead of only a title-change notice.
+                went_offline_after_last_notification = self.offline_timer_cache[
+                    domain
+                ] > self.notification_service.get_last_notification_time(domain)
+            case _StreamTransitionKind.WENT_OFFLINE:
+                self.offline_timer_cache[domain] = time.monotonic()
+                self.log.info("[%s] Stream is now offline.", domain)
+            case _StreamTransitionKind.STATUS_UNCHANGED:
+                pass
+
+        notification_kind = _classify_notification(
+            transition,
+            old_state,
+            observation,
+            offline_duration_seconds=offline_duration_seconds,
+            went_offline_after_last_notification=went_offline_after_last_notification,
+        )
+
+        stream_config: StreamConfigObservation | None = None
+        observed_at = datetime.fromisoformat(observation.observed_at)
+        hourly_config_refresh_due = (
+            observed_at.tzinfo is not None and observed_at.astimezone(UTC).minute == 0
+        )
+        should_fetch_config = (
+            notification_kind.should_notify
+            or transition.kind is _StreamTransitionKind.FIRST_OBSERVATION
+            or hourly_config_refresh_due
+        )
+        if should_fetch_config:
             stream_config = await self.owncast_client.get_stream_config(domain)
 
-                # Use fallback values if config fetch failed
+        if notification_kind.should_notify:
             stream_name = stream_config.name if stream_config else domain
-                stream_tags = stream_config.tags if stream_config else []
+            stream_tags = stream_config.tags if stream_config else ()
+            is_title_change = notification_kind is _NotificationKind.TITLE_CHANGE
 
-                # Was the last notification sent before the stream
-                # last went offline? If so, send a regular go-live
-                # instead of a title change to avoid confusion.
-                if self.offline_timer_cache[
-                    domain
-                ] > self.notification_service.get_last_notification_time(domain):
             await self.notification_service.notify_stream_live(
                 domain,
                 stream_name,
-                        new_state.title or "",
+                observation.title or "",
                 stream_tags,
-                        title_change=False,
+                title_change=is_title_change,
+            )
+
+        self.log.debug("[%s] Saving stream state if changed...", domain)
+
+        if stream_config is not None:
+            await self.stream_repo.update(
+                domain,
+                name=stream_config.name,
+                title=observation.title,
+                online=observation.online,
+                status_since=transition.status_since,
             )
         else:
-                    # No. Send a normal title change notification.
+            await self.stream_repo.update(
-                    await self.notification_service.notify_stream_live(
                 domain,
-                        stream_name,
+                title=observation.title,
-                        new_state.title or "",
+                online=observation.online,
-                        stream_tags,
+                status_since=transition.status_since,
-                        title_change=True,
             )
 
-        # Did the stream go offline (old had connect, new doesn't)?
-        elif (
-            new_state.last_connect_time is None
-            and old_state.last_connect_time is not None
-        ):
-            # Yep. This stream is now offline. Log it.
-            update_database = True
-            self.offline_timer_cache[domain] = time.monotonic()
-            self.log.info(f"[{domain}] Stream is now offline.")
-
-        # Update the database with current stream state, if needed.
-        if update_database:
-            # Ensure we have the stream config before updating
-            if stream_config is None:
-                stream_config = await self.owncast_client.get_stream_config(domain)
-
-            # Use fallback value if config fetch failed
-            stream_name = stream_config.name if stream_config else ""
-
-            self.log.debug(f"[{domain}] Updating stream state in database...")
-
-            # Create updated state object (title already truncated in new_state)
-            updated_state = StreamState(
-                domain=domain,
-                name=stream_name,
-                title=new_state.title,
-                last_connect_time=new_state.last_connect_time,
-                last_disconnect_time=new_state.last_disconnect_time,
-            )
-
-            await self.stream_repo.update(updated_state)
-
         # All done.
-        self.log.debug(f"[{domain}] State update completed.")
+        self.log.debug("[%s] State update completed.", domain)
-        if new_state.last_connect_time is not None:
+        stream_status = (
-            self.metrics.set_stream_status(domain, StreamStatus.ONLINE)
+            StreamStatus.ONLINE if observation.online else StreamStatus.OFFLINE
-        else:
+        )
-            self.metrics.set_stream_status(domain, StreamStatus.OFFLINE)
+        self.metrics.set_stream_status(domain, stream_status)
         return True
 
     async def _check_cleanup_thresholds(self, domain: str, counter: int) -> None:
@@ -342,17 +421,18 @@ class StreamMonitor:
         :param counter: The current failure counter value.
         """
         # Check for 83-day warning threshold
-        if counter == CLEANUP_WARNING_THRESHOLD:
+        if counter == _CLEANUP_WARNING_THRESHOLD:
             self.log.warning(
-                f"[{domain}] Reached 83-day warning threshold. Sending cleanup warning."
+                "[%s] Reached 83-day warning threshold. Sending cleanup warning.",
+                domain,
             )
             await self.notification_service.send_cleanup_warning(domain)
 
         # Check for 90-day deletion threshold
-        if counter >= CLEANUP_DELETE_THRESHOLD:
+        if counter >= _CLEANUP_DELETE_THRESHOLD:
             self.log.warning(
-                f"[{domain}] Reached 90-day deletion threshold."
+                "[%s] Reached 90-day deletion threshold. Removing all subscriptions.",
-                f" Removing all subscriptions."
+                domain,
             )
             # Send deletion notification
             await self.notification_service.send_cleanup_deletion(domain)
@@ -362,10 +442,12 @@ class StreamMonitor:
 
             # Delete the stream record
             await self.stream_repo.delete(domain)
+            self.offline_timer_cache.pop(domain, None)
+            self.notification_service.clear_notification_state(domain)
 
             self.log.info(
-                f"[{domain}] Cleanup complete. "
+                "[%s] Cleanup complete. Deleted %s subscriptions and stream record.",
-                f"Deleted {deleted_count} subscriptions "
+                domain,
-                f"and stream record."
+                deleted_count,
             )
             self.metrics.remove_stream(domain)

owncastsentry/subscription_manager.py

@@ -0,0 +1,119 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Business logic for managing room stream subscriptions."""
+
+import re
+from typing import TYPE_CHECKING
+from urllib.parse import urlparse
+
+from .types import (
+    InvalidOwncastInstanceError,
+    RoomSubscription,
+)
+
+if TYPE_CHECKING:
+    import logging
+
+    from .owncast_client import OwncastClient
+    from .repository import StreamRepository, SubscriptionRepository
+
+
+_DOMAIN_CLEANUP_RE = re.compile(r"[^a-z0-9.-]")
+
+
+def _domainify(url: str) -> str:
+    """Extract and sanitize a domain from user input."""
+    url = url.strip()
+
+    if "@" in url:
+        url = url.rsplit("@", 1)[1]
+
+    if not url.startswith(("http://", "https://", "//")):
+        url = f"//{url}"
+
+    parsed = urlparse(url)
+    domain = (parsed.netloc or parsed.path).lower()
+    domain = domain.partition(":")[0].partition("/")[0]
+    return _DOMAIN_CLEANUP_RE.sub("", domain).strip(".-")
+
+
+class SubscriptionManager:
+    """Coordinates subscription use cases between handlers and repositories."""
+
+    def __init__(
+        self,
+        owncast_client: OwncastClient,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+        logger: logging.Logger,
+    ) -> None:
+        """Initialize the subscription manager."""
+        self.owncast_client = owncast_client
+        self.stream_repo = stream_repo
+        self.subscription_repo = subscription_repo
+        self.log = logger
+
+    async def subscribe(self, room_id: str, url: str) -> str:
+        """Subscribe a room to stream notifications and return the stream domain.
+
+        :param room_id: Matrix room ID to subscribe.
+        :param url: User-supplied Owncast URL, domain, or Fediverse-style address.
+        :return: Normalized stream domain.
+        :raises InvalidOwncastInstanceError: If first-time validation fails.
+        :raises AlreadySubscribedError: If the room is already subscribed.
+        """
+        stream_domain = _domainify(url)
+
+        subscription_count = await self.subscription_repo.count_by_domain(stream_domain)
+        if subscription_count == 0:
+            is_valid = await self.owncast_client.validate_instance(stream_domain)
+            if not is_valid:
+                raise InvalidOwncastInstanceError(stream_domain)
+
+        await self.subscription_repo.add(stream_domain, room_id)
+
+        if await self.stream_repo.create(stream_domain):
+            self.log.info("[%s] Discovered new stream!", stream_domain)
+
+        self.log.info("[%s] Subscription added for room %s.", stream_domain, room_id)
+        return stream_domain
+
+    async def unsubscribe(self, room_id: str, url: str) -> str:
+        """Remove a room subscription and return the stream domain.
+
+        :param room_id: Matrix room ID to unsubscribe.
+        :param url: User-supplied Owncast URL, domain, or Fediverse-style address.
+        :return: Normalized stream domain.
+        :raises NotSubscribedError: If no subscription was removed.
+        """
+        stream_domain = _domainify(url)
+        await self.subscription_repo.remove(stream_domain, room_id)
+
+        self.log.info("[%s] Subscription removed for room %s.", stream_domain, room_id)
+        return stream_domain
+
+    async def list_room_subscriptions(self, room_id: str) -> list[RoomSubscription]:
+        """Return stream subscriptions for a room with display state attached."""
+        return await self.subscription_repo.get_room_subscriptions(room_id)
+
+    async def has_room_subscriptions(self, room_id: str) -> bool:
+        """Return whether the room has any stream subscriptions."""
+        return await self.subscription_repo.has_room_subscriptions(room_id)
+
+    async def list_live_room_subscriptions(
+        self, room_id: str
+    ) -> list[RoomSubscription]:
+        """Return only currently online stream subscriptions for a room."""
+        return await self.subscription_repo.get_live_room_subscriptions(room_id)

owncastsentry/types.py

@@ -0,0 +1,257 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Data containers and domain errors for OwncastSentry."""
+
+from dataclasses import dataclass, field
+from datetime import UTC, datetime
+from enum import Enum
+from typing import Any
+
+UNKNOWN_STATUS_THRESHOLD = 15
+
+# Maximum field lengths based on Owncast's admin config constants.
+# Source: https://github.com/owncast/owncast/blob/master/web/utils/config-constants.tsx
+_MAX_INSTANCE_TITLE_LENGTH = 255  # TEXTFIELD_PROPS_SERVER_NAME maxLength
+_MAX_STREAM_TITLE_LENGTH = 100  # TEXTFIELD_PROPS_STREAM_TITLE maxLength
+_MAX_TAG_LENGTH = 24  # tag maxLength
+
+
+class InvalidApiResponseError(ValueError):
+    """The Owncast API response did not match the expected shape."""
+
+
+def _require_field(response: dict[str, Any], field: str) -> Any:
+    """Return a required API response field or raise if missing."""
+    try:
+        return response[field]
+    except KeyError as e:
+        raise InvalidApiResponseError(f"missing field: {field}") from e
+
+
+def _require_str(response: dict[str, Any], field: str) -> str:
+    """Return a required string API response field."""
+    value = _require_field(response, field)
+    if not isinstance(value, str):
+        raise InvalidApiResponseError(f"{field} must be a string")
+    return value
+
+
+def _optional_config_str(response: dict[str, Any], field: str) -> str:
+    """Return an optional config string, defaulting to empty when absent."""
+    value = response.get(field, "")
+    if not isinstance(value, str):
+        raise InvalidApiResponseError(f"{field} must be a string")
+    return value
+
+
+def _optional_tag_list(response: dict[str, Any]) -> list[str]:
+    """Return optional config tags, defaulting to an empty list when absent."""
+    value = response.get("tags", [])
+    if not isinstance(value, list):
+        raise InvalidApiResponseError("tags must be a list")
+    if not all(isinstance(tag, str) for tag in value):
+        raise InvalidApiResponseError("tags must contain only strings")
+    return value
+
+
+def _truncate(text: str, max_length: int) -> str:
+    """Truncate text to a maximum length."""
+    if len(text) <= max_length:
+        return text
+    return text[:max_length]
+
+
+def format_status_since(timestamp: datetime) -> str:
+    """Format a status timestamp using the package's canonical UTC format."""
+    if timestamp.tzinfo is None:
+        timestamp = timestamp.replace(tzinfo=UTC)
+    return timestamp.astimezone(UTC).isoformat(timespec="seconds")
+
+
+def _current_observed_at() -> str:
+    """Return the current UTC time in the package's timestamp format."""
+    return format_status_since(datetime.now(UTC))
+
+
+class StreamStatus(Enum):
+    """Represents the status of a stream."""
+
+    ONLINE = "online"
+    OFFLINE = "offline"
+    UNKNOWN = "unknown"
+
+
+@dataclass(frozen=True, slots=True)
+class StreamStateObservation:
+    """Status API sample fetched from an Owncast instance.
+
+    This records what `/api/status` reported during one request. `observed_at`
+    belongs to that fetch; the monitor decides whether that time starts a new
+    persisted online/offline period in `StreamState`.
+    """
+
+    domain: str
+    title: str | None = None
+    online: bool = False
+    observed_at: str = field(default_factory=_current_observed_at)
+
+    @classmethod
+    def from_api_response(
+        cls, response: dict[str, Any], domain: str
+    ) -> StreamStateObservation:
+        """Create a StreamStateObservation from a status API response.
+
+        :param response: API response as a dictionary (camelCase keys).
+        :param domain: The stream domain.
+        :return: StreamStateObservation instance.
+        :raises InvalidApiResponseError: If the response shape is invalid.
+        """
+        stream_title = _require_str(response, "streamTitle")
+        online = _require_field(response, "online")
+        if not isinstance(online, bool):
+            raise InvalidApiResponseError("online must be a boolean")
+
+        return cls(
+            domain=domain,
+            title=_truncate(stream_title, _MAX_STREAM_TITLE_LENGTH),
+            online=online,
+        )
+
+
+@dataclass(frozen=True, slots=True)
+class StreamState:
+    """Stream record remembered by the repository.
+
+    States include persisted display data, the current online/offline period,
+    and failure counters used to derive user-facing status. `status_since`
+    records when the persisted online/offline period began.
+    """
+
+    domain: str
+    name: str | None = None
+    title: str | None = None
+    online: bool = False
+    status_since: str | None = None
+    failure_counter: int = 0
+
+    @property
+    def status(self) -> StreamStatus:
+        """Derive stream status from failure count and online state.
+
+        Returns UNKNOWN if failures exceed the threshold, ONLINE if the
+        stream is online, or OFFLINE otherwise.
+        """
+        if self.failure_counter > UNKNOWN_STATUS_THRESHOLD:
+            return StreamStatus.UNKNOWN
+        if self.online:
+            return StreamStatus.ONLINE
+        return StreamStatus.OFFLINE
+
+    @classmethod
+    def from_db_row(cls, row: dict[str, Any]) -> StreamState:
+        """Create a StreamState from a database row.
+
+        :param row: Database row as a dictionary.
+        :return: StreamState instance.
+        """
+        return cls(
+            domain=row["domain"],
+            name=row["name"],
+            title=row["title"],
+            online=bool(row["online"]),
+            status_since=row["status_since"],
+            failure_counter=row["failure_counter"],
+        )
+
+
+@dataclass(frozen=True, slots=True)
+class StreamConfigObservation:
+    """Config API sample fetched from an Owncast instance.
+
+    This records display metadata from one `/api/config` request. It is used for
+    notification text and may refresh persisted display fields independently of
+    the stream's online/offline state.
+    """
+
+    name: str = ""
+    tags: tuple[str, ...] = ()
+    observed_at: str = field(default_factory=_current_observed_at)
+
+    @classmethod
+    def from_api_response(cls, response: dict[str, Any]) -> StreamConfigObservation:
+        """Create a StreamConfigObservation from an API response.
+
+        :param response: API response as a dictionary.
+        :return: StreamConfigObservation instance.
+        :raises InvalidApiResponseError: If the response shape is invalid.
+        """
+        # Apply Owncast's instance name limit.
+        name = _truncate(
+            _optional_config_str(response, "name"), _MAX_INSTANCE_TITLE_LENGTH
+        )
+
+        # Apply Owncast's per-tag limit.
+        raw_tags = _optional_tag_list(response)
+        tags = tuple([_truncate(tag, _MAX_TAG_LENGTH) for tag in raw_tags])
+
+        return cls(name=name, tags=tags)
+
+
+@dataclass(frozen=True, slots=True)
+class UpdateResult:
+    """Result of a stream update cycle."""
+
+    total_streams: int
+    successful_checks: int
+    failed_checks: int
+
+
+class SubscriptionError(Exception):
+    """Base class for subscription domain errors."""
+
+
+class InvalidOwncastInstanceError(SubscriptionError):
+    """The requested domain is not a reachable Owncast instance."""
+
+    def __init__(self, domain: str) -> None:
+        """Initialize with the rejected stream domain."""
+        self.domain = domain
+        super().__init__(f"invalid Owncast instance: {domain}")
+
+
+class AlreadySubscribedError(SubscriptionError):
+    """The room is already subscribed to the stream."""
+
+    def __init__(self, domain: str) -> None:
+        """Initialize with the duplicate stream domain."""
+        self.domain = domain
+        super().__init__(f"already subscribed: {domain}")
+
+
+class NotSubscribedError(SubscriptionError):
+    """The room is not subscribed to the stream."""
+
+    def __init__(self, domain: str) -> None:
+        """Initialize with the missing stream domain."""
+        self.domain = domain
+        super().__init__(f"not subscribed: {domain}")
+
+
+@dataclass(frozen=True, slots=True)
+class RoomSubscription:
+    """A stream subscription resolved with the stream state used for display."""
+
+    domain: str
+    stream_state: StreamState

owncastsentry/utils.py

@@ -1,205 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Utility functions and constants for OwncastSentry."""
-
-import re
-from urllib.parse import urlparse
-
-# Path to the GetStatus API call on Owncast instances
-OWNCAST_STATUS_PATH = "/api/status"
-
-# Path to GetWebConfig API call on Owncast instances
-OWNCAST_CONFIG_PATH = "/api/config"
-
-# Fields that must be present in an Owncast status API response
-REQUIRED_STATUS_FIELDS = frozenset(
-    {
-        "lastConnectTime",
-        "lastDisconnectTime",
-        "streamTitle",
-        "online",
-    }
-)
-
-
-def user_agent(version: str) -> str:
-    """Build the User-Agent header string for HTTP requests.
-
-    :param version: The plugin version string.
-    :return: A formatted User-Agent string.
-    """
-    return (
-        f"OwncastSentry/{version}"
-        " (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)"
-    )
-
-
-# Hard minimum amount of time between when notifications can be sent
-# for a stream. Prevents spamming notifications for glitchy or
-# malicious streams.
-SECONDS_BETWEEN_NOTIFICATIONS = 20 * 60  # 20 minutes in seconds
-
-# After a stream goes offline, a timer is started. Then, ...
-# - If a stream comes back online with the same title within this
-#   time, no notification is sent.
-# - If a stream comes back online with a different title, a rename
-#   notification is sent.
-# - If this time period passes entirely and a stream comes back
-#   online after, it's treated as regular going live.
-TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN = 7 * 60  # 7 min in seconds
-
-# Auto-cleanup timing (days of continuous unreachability)
-CLEANUP_WARNING_DAYS = 83
-CLEANUP_DELETE_DAYS = 90
-
-# Counter thresholds derived from days (60-second polling intervals)
-CLEANUP_WARNING_THRESHOLD = CLEANUP_WARNING_DAYS * 24 * 60
-CLEANUP_DELETE_THRESHOLD = CLEANUP_DELETE_DAYS * 24 * 60
-
-# Failure counter threshold for treating stream status as "unknown"
-UNKNOWN_STATUS_THRESHOLD = 15
-
-# Maximum field lengths based on Owncast's configuration
-# Source: https://github.com/owncast/owncast/blob/master/
-#         web/utils/config-constants.tsx
-MAX_INSTANCE_TITLE_LENGTH = 255  # Server Name (line 81)
-MAX_STREAM_TITLE_LENGTH = 100  # Stream Title (line 91)
-MAX_TAG_LENGTH = 24  # Per tag (line 208)
-
-
-def should_query_stream(failure_counter: int) -> bool:
-    """Determine if a stream should be queried based on failure count.
-
-    Implements progressive backoff with increasing intervals:
-    - Counters 0-4:   every 60s  (first 5 minutes)
-    - Counters 5-9:   every 2min (next 5 minutes)
-    - Counters 10-14: every 3min (next 5 minutes)
-    - Counters 15-29: every 5min (next 15 minutes)
-    - Counters 30+:   every 15min
-
-    :param failure_counter: The current failure counter value.
-    :return: True if the stream should be queried this cycle.
-    """
-    if failure_counter <= 4:
-        # Query every cycle for first 5 minutes (counters 0-4)
-        return True
-    if failure_counter <= 9:
-        # Query every 2nd cycle for next 5 minutes (counters 5-9)
-        return failure_counter % 2 == 0
-    if failure_counter <= 14:
-        # Query every 3rd cycle for next 5 minutes (counters 10-14)
-        return failure_counter % 3 == 0
-    if failure_counter <= 29:
-        # Query every 5th cycle for next 15 minutes (counters 15-29)
-        return failure_counter % 5 == 0
-    # Query every 15th cycle after 30 minutes (counter 30+)
-    return failure_counter % 15 == 0
-
-
-def domainify(url: str) -> str:
-    """Extract and sanitize a domain from user input.
-
-    Handles URLs, bare domains, and email-style input (user@domain).
-    Only allows valid domain characters (alphanumeric, hyphens, periods).
-
-    :param url: URL, domain, or email-style string
-    :return: Sanitized domain
-    """
-    # Handle email-style format first (e.g., "notify@stream.logal.dev")
-    if "@" in url:
-        url = url.split("@")[-1]
-
-    # Prepend // if no scheme so urlparse treats input as netloc
-    if not url.startswith(("http://", "https://", "//")):
-        url = f"//{url}"
-
-    parsed = urlparse(url)
-    domain = (parsed.netloc or parsed.path).lower()
-
-    # Strip port and path
-    domain = domain.split(":")[0].split("/")[0]
-
-    # Allow only valid domain characters
-    return re.sub(r"[^a-z0-9.-]", "", domain).strip(".-")
-
-
-def truncate(text: str, max_length: int) -> str:
-    """Truncate text to a maximum length.
-
-    :param text: The text to truncate
-    :param max_length: Maximum allowed length
-    :return: Truncated text, or original if within limit
-    """
-    if not text or len(text) <= max_length:
-        return text
-    return text[:max_length]
-
-
-_MARKDOWN_ESCAPE_TABLE = str.maketrans({c: f"\\{c}" for c in r"\*_[]()~`#+-=|{}.!<>&"})
-
-
-def escape_markdown(text: str) -> str:
-    """Escape Markdown special characters to prevent injection attacks.
-
-    This function sanitizes untrusted external input (like stream names and titles)
-    before embedding them in Markdown-formatted messages. It prevents malicious
-    actors from injecting arbitrary Markdown/HTML content.
-
-    :param text: The text to escape
-    :return: The escaped text safe for Markdown rendering
-    """
-    if not text:
-        return text
-
-    return text.translate(_MARKDOWN_ESCAPE_TABLE)
-
-
-def sanitize_for_plain_text(text: str) -> str:
-    """Sanitize text for plain text rendering.
-
-    Remove newlines and normalize whitespace without escaping
-    special characters. Use this for plain text notifications where
-    escaping would show literal backslashes.
-
-    :param text: The text to sanitize
-    :return: Sanitized text
-    """
-    if not text:
-        return text
-
-    # Remove newlines and carriage returns to prevent multi-line injection
-    sanitized = text.replace("\n", " ").replace("\r", " ")
-
-    # Collapse multiple spaces into single space
-    return " ".join(sanitized.split())
-
-
-def sanitize_for_markdown(text: str) -> str:
-    """Sanitize text for safe Markdown rendering.
-
-    Remove newlines, normalize whitespace, and escape Markdown special
-    characters. Use this for any untrusted external content before
-    embedding in Markdown messages.
-
-    Note: This function does not truncate. Size limits should be
-    enforced at the model layer (e.g., in from_api_response methods).
-
-    :param text: The text to sanitize
-    :return: Sanitized and escaped text safe for Markdown rendering
-    """
-    if not text:
-        return text
-
-    return escape_markdown(sanitize_for_plain_text(text))

pyproject.toml

@@ -22,12 +22,12 @@ dev = [
     "aioresponses>=0.7.8",
     "codespell>=2.4.2",
     "hatch>=1.16.5",
-    "mypy>=1.20.2",
+    "mypy>=2.1.0",
     "pip-audit>=2.10.0",
     "pytest>=9.0.3",
     "pytest-asyncio>=1.3.0",
     "pytest-cov>=7.1.0",
-    "ruff>=0.15.12",
+    "ruff>=0.15.13",
     "time-machine>=3.2.0",
 ]
 
@@ -42,68 +42,43 @@ python_version = "3.14"
 strict = true
 warn_unreachable = true
 explicit_package_bases = true
-exclude = ["owncastsentry/_version\\.py", "tests/"]
+# Maubot's pytest helpers are not fully typed, so strict mypy checks on
+# integration tests produce noise around fixture-provided bot/plugin objects.
+exclude = ["tests/"]
 
 [tool.ruff]
 target-version = "py314"
 extend-exclude = ["owncastsentry/_version.py"]  # auto-generated by hatch-vcs
 
 [tool.ruff.lint]
-select = [
+select = ["ALL"]
-    # Core
-    "F",     # Pyflakes
-    "E",     # pycodestyle errors
-    "W",     # pycodestyle warnings
-    "N",     # pep8-naming
-    "D",     # pydocstyle
-    "I",     # isort
-    "ICN",   # flake8-import-conventions
-
-    # Correctness & bugs
-    "B",     # flake8-bugbear
-    "ASYNC", # flake8-async
-    "DTZ",   # flake8-datetimez
-    "RSE",   # flake8-raise
-    "RET",   # flake8-return
-    "A",     # flake8-builtins
-    "PIE",   # flake8-pie
-
-    # Modernization & simplification
-    "UP",    # pyupgrade
-    "SIM",   # flake8-simplify
-    "C4",    # flake8-comprehensions
-    "FLY",   # flynt (f-string conversion)
-    "PTH",   # flake8-use-pathlib
-
-    # Performance
-    "PERF",  # Perflint
-
-    # Security
-    "S",     # flake8-bandit
-
-    # Code hygiene
-    "T10",   # flake8-debugger
-    "T20",   # flake8-print
-    "ERA",   # eradicate
-    "PGH",   # pygrep-hooks
-    "TC",    # flake8-type-checking
-
-    # Testing
-    "PT",    # flake8-pytest-style
-
-    # Ruff-specific
-    "RUF",   # Ruff-specific rules
-]
 ignore = [
+    "ANN401",  # Any is valid at system boundaries; mypy strict handles real issues
+    "C901",    # McCabe complexity: noisy and not actionable
+    "COM812",  # handled by the formatter
     "D203",    # incompatible with D211 (no blank line before class docstring)
     "D213",    # incompatible with D212 (summary on first line)
+    "EM",      # exception message style: inline literals are fine
+    "PLR0911", # too many return statements: flat early-returns are clear
+    "PLR0912", # too many branches: inherent in parsers, validators, CLI
+    "PLR0913", # too many arguments: API surfaces and constructors need them
+    "PLR0915", # too many statements: inherent in parsers, validators, CLI
+    "TRY003",  # inline exception messages are fine (complements EM ignore)
+    "TRY301",  # raise inside try: guard clauses don't need helper functions
 ]
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "function"
 
 [tool.ruff.lint.per-file-ignores]
-"tests/**" = ["S101"]
+"tests/**" = [
+    "S101",     # assert is standard for pytest
+    "S311",     # pseudo-random generators are fine in tests
+    "SLF001",   # tests legitimately access private members for verification
+    "ARG001",   # unused args are normal for fixtures and handler stubs
+    "PLR2004",  # magic values are clear in test assertions
+]
 
 [tool.coverage.run]
 source = ["owncastsentry"]
@@ -114,4 +89,4 @@ show_missing = true
 skip_empty = true
 
 [tool.codespell]
-skip = "uv.lock"
+skip = "owncastsentry/_version.py,uv.lock"

tests/conftest.py

@@ -23,15 +23,22 @@ from prometheus_client import generate_latest
 
 from owncastsentry import OwncastSentry
 from owncastsentry.config import Config
-from owncastsentry.database import StreamRepository, SubscriptionRepository
+from owncastsentry.repository import (
-from owncastsentry.migrations import get_upgrade_table
+    StreamRepository,
+    SubscriptionRepository,
+    get_upgrade_table,
+)
 
 if TYPE_CHECKING:
     from collections.abc import AsyncIterator
     from pathlib import Path
 
+    from maubot import Plugin
+    from mautrix.util.async_db import UpgradeTable
+    from mautrix.util.config import BaseProxyConfig
+
     from owncastsentry.metrics import MetricsService
-    from owncastsentry.models import StreamConfig, StreamState
+    from owncastsentry.types import StreamConfigObservation, StreamStateObservation
 
 
 def generate_metrics_output(metrics: MetricsService) -> str:
@@ -69,19 +76,19 @@ def subscription_repo(database: Database) -> SubscriptionRepository:
 
 
 @pytest.fixture
-def maubot_plugin_class():
+def maubot_plugin_class() -> type[Plugin]:
     """Use OwncastSentry as the plugin class for maubot integration tests."""
     return OwncastSentry
 
 
 @pytest.fixture
-def maubot_plugin_config_class():
+def maubot_plugin_config_class() -> type[BaseProxyConfig]:
     """Use our Config class for maubot integration tests."""
     return Config
 
 
 @pytest.fixture
-def maubot_upgrade_table():
+def maubot_upgrade_table() -> UpgradeTable:
     """Provide the database upgrade table for maubot integration tests."""
     return get_upgrade_table()
 
@@ -205,19 +212,19 @@ class _StubMatrixClient:
 class _StubOwncastClient:
     """Configurable stub for the Owncast HTTP client."""
 
-    stream_state: StreamState | None = None
+    stream_state: StreamStateObservation | None = None
-    stream_config: StreamConfig | None = None
+    stream_config: StreamConfigObservation | None = None
     state_call_count: int = field(default=0, init=False)
     config_call_count: int = field(default=0, init=False)
     queried_domains: list[str] = field(default_factory=list, init=False)
 
-    async def get_stream_state(self, domain: str) -> StreamState | None:
+    async def get_stream_state(self, domain: str) -> StreamStateObservation | None:
-        """Return the configured stream state."""
+        """Return the configured stream observation."""
         self.state_call_count += 1
         self.queried_domains.append(domain)
         return self.stream_state
 
-    async def get_stream_config(self, domain: str) -> StreamConfig | None:
+    async def get_stream_config(self, _domain: str) -> StreamConfigObservation | None:
         """Return the configured stream config."""
         self.config_call_count += 1
         return self.stream_config

tests/test_commands.py

@@ -15,28 +15,66 @@
 """Tests for bot command handlers."""
 
 import json
-import logging
 from datetime import UTC, datetime, timedelta
-from unittest.mock import MagicMock
+from typing import TYPE_CHECKING
 
 import pytest
 import time_machine
 from aioresponses import aioresponses
 
-from owncastsentry.commands import CommandHandler
+from owncastsentry.commands import (
-from owncastsentry.models import StreamState
+    _SECONDS_PER_DAY,
-from owncastsentry.utils import OWNCAST_STATUS_PATH, UNKNOWN_STATUS_THRESHOLD
+    _SECONDS_PER_HOUR,
+    _SECONDS_PER_MINUTE,
+    _escape_markdown,
+    _format_duration,
+    _sanitize_for_markdown,
+)
+from owncastsentry.owncast_client import _OWNCAST_STATUS_PATH
+from owncastsentry.types import UNKNOWN_STATUS_THRESHOLD
 from tests.conftest import VALID_STATUS_RESPONSE
 
+if TYPE_CHECKING:
+    from maubot.testing.bot import TestBot
 
-def _make_command_handler() -> CommandHandler:
+    from owncastsentry import OwncastSentry
-    """Build a CommandHandler with dummy dependencies for pure logic tests."""
+
-    return CommandHandler(
+
-        owncast_client=MagicMock(),
+class TestEscapeMarkdown:
-        stream_repo=MagicMock(),
+    """Markdown special character escaping."""
-        subscription_repo=MagicMock(),
+
-        logger=logging.getLogger("test"),
+    @pytest.mark.parametrize(
+        ("input_text", "expected"),
+        [
+            pytest.param("hello", "hello", id="plain-text-unchanged"),
+            pytest.param("*bold*", "\\*bold\\*", id="asterisks"),
+            pytest.param("_italic_", "\\_italic\\_", id="underscores"),
+            pytest.param("[link](url)", "\\[link\\]\\(url\\)", id="link-syntax"),
+            pytest.param("`code`", "\\`code\\`", id="backticks"),
+            pytest.param("# heading", "\\# heading", id="heading"),
+            pytest.param("> quote", "\\> quote", id="blockquote"),
+            pytest.param("<html>", "\\<html\\>", id="angle-brackets"),
+            pytest.param("a & b", "a \\& b", id="ampersand"),
+            pytest.param("a\\b", "a\\\\b", id="backslash"),
+            pytest.param("", "", id="empty-string"),
+        ],
     )
+    def test_escapes_special_chars(self, input_text: str, expected: str) -> None:
+        """Escape Markdown special characters in input text."""
+        assert _escape_markdown(input_text) == expected
+
+
+class TestSanitizeForMarkdown:
+    """Markdown sanitization combining whitespace normalization and escaping."""
+
+    def test_removes_newlines_and_escapes(self) -> None:
+        """Normalize newlines and escape Markdown special characters."""
+        result = _sanitize_for_markdown("*bold*\nnew line")
+        assert result == "\\*bold\\* new line"
+
+    def test_empty_string(self) -> None:
+        """Return empty string unchanged."""
+        assert _sanitize_for_markdown("") == ""
 
 
 class TestFormatDuration:
@@ -49,34 +87,41 @@ class TestFormatDuration:
         [
             pytest.param(1, "1 second", id="singular-second"),
             pytest.param(30, "30 seconds", id="plural-seconds"),
-            pytest.param(60, "1 minute", id="singular-minute"),
+            pytest.param(_SECONDS_PER_MINUTE, "1 minute", id="singular-minute"),
-            pytest.param(120, "2 minutes", id="plural-minutes"),
+            pytest.param(2 * _SECONDS_PER_MINUTE, "2 minutes", id="plural-minutes"),
-            pytest.param(3600, "1 hour", id="singular-hour"),
+            pytest.param(_SECONDS_PER_HOUR, "1 hour", id="singular-hour"),
-            pytest.param(7200, "2 hours", id="plural-hours"),
+            pytest.param(2 * _SECONDS_PER_HOUR, "2 hours", id="plural-hours"),
-            pytest.param(86400, "1 day", id="singular-day"),
+            pytest.param(_SECONDS_PER_DAY, "1 day", id="singular-day"),
-            pytest.param(172800, "2 days", id="plural-days"),
+            pytest.param(2 * _SECONDS_PER_DAY, "2 days", id="plural-days"),
         ],
     )
-    @time_machine.travel(_NOW)
     def test_formats_duration(self, seconds_ago: int, expected: str) -> None:
         """Format a timestamp into a human-readable duration."""
-        handler = _make_command_handler()
         timestamp = (self._NOW - timedelta(seconds=seconds_ago)).isoformat()
-        result = handler._format_duration(timestamp)
+        result = _format_duration(timestamp, self._NOW)
         assert result == expected
 
     def test_invalid_timestamp(self) -> None:
         """Return 'unknown duration' for unparsable timestamps."""
-        handler = _make_command_handler()
+        assert _format_duration("not-a-timestamp", self._NOW) == "unknown duration"
-        assert handler._format_duration("not-a-timestamp") == "unknown duration"
+
+    def test_naive_timestamp(self) -> None:
+        """Return 'unknown duration' for timestamps without timezone information."""
+        assert _format_duration("2026-03-13T11:59:00", self._NOW) == "unknown duration"
+
+    def test_future_timestamp(self) -> None:
+        """Return 'unknown duration' for timestamps in the future."""
+        timestamp = (self._NOW + timedelta(seconds=1)).isoformat()
+        assert _format_duration(timestamp, self._NOW) == "unknown duration"
 
 
+@pytest.mark.usefixtures("maubot_plugin")
 class TestSubscribeCommand:
     """Subscribe command end-to-end via maubot."""
 
-    async def test_subscribe_valid_stream(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_subscribe_valid_stream(self, maubot_test_bot: TestBot) -> None:
         """Subscribe to a valid Owncast stream."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -90,11 +135,9 @@ class TestSubscribeCommand:
             "stream.logal.dev goes live."
         )
 
-    async def test_subscribe_invalid_stream(
+    async def test_subscribe_invalid_stream(self, maubot_test_bot: TestBot) -> None:
-        self, maubot_test_bot, maubot_plugin
-    ) -> None:
         """Reject subscription to an invalid Owncast instance."""
-        status_url = f"https://invalid.com{OWNCAST_STATUS_PATH}"
+        status_url = f"https://invalid.com{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(status_url, status=404)
             await maubot_test_bot.send("!subscribe invalid.com")
@@ -107,11 +150,9 @@ class TestSubscribeCommand:
             "instance is offline."
         )
 
-    async def test_subscribe_already_subscribed(
+    async def test_subscribe_already_subscribed(self, maubot_test_bot: TestBot) -> None:
-        self, maubot_test_bot, maubot_plugin
-    ) -> None:
         """Reject duplicate subscription in the same room."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -128,10 +169,10 @@ class TestSubscribeCommand:
         )
 
     async def test_subscribe_existing_stream_new_room(
-        self, maubot_test_bot, maubot_plugin
+        self, maubot_test_bot: TestBot
     ) -> None:
-        """Skip instance validation when subscribing from a new room."""
+        """Skip validation when the domain already has subscriptions."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -139,9 +180,9 @@ class TestSubscribeCommand:
             )
             await maubot_test_bot.send("!subscribe stream.logal.dev")
 
-        # Subscribe from a different room; skips validation and should not
+        # Subscribe from a different room. The existing subscribed domain skips
-        # query the remote instance. An empty aioresponses context will raise
+        # validation, so an empty aioresponses context will raise ConnectionError
-        # ConnectionError if any HTTP request is attempted.
+        # if any HTTP request is attempted.
         with aioresponses():
             await maubot_test_bot.send(
                 "!subscribe stream.logal.dev", room_id="!otherroom:example.com"
@@ -154,12 +195,13 @@ class TestSubscribeCommand:
         )
 
 
+@pytest.mark.usefixtures("maubot_plugin")
 class TestUnsubscribeCommand:
     """Unsubscribe command end-to-end via maubot."""
 
-    async def test_unsubscribe_existing(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_unsubscribe_existing(self, maubot_test_bot: TestBot) -> None:
         """Unsubscribe from a subscribed stream."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -175,9 +217,7 @@ class TestUnsubscribeCommand:
             "longer receive notifications for stream.logal.dev."
         )
 
-    async def test_unsubscribe_not_subscribed(
+    async def test_unsubscribe_not_subscribed(self, maubot_test_bot: TestBot) -> None:
-        self, maubot_test_bot, maubot_plugin
-    ) -> None:
         """Reject unsubscribe from a non-subscribed stream."""
         await maubot_test_bot.send("!unsubscribe unknown.com")
 
@@ -187,10 +227,11 @@ class TestUnsubscribeCommand:
         )
 
 
+@pytest.mark.usefixtures("maubot_plugin")
 class TestSubscriptionsCommand:
     """Subscriptions listing command end-to-end via maubot."""
 
-    async def test_no_subscriptions(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_no_subscriptions(self, maubot_test_bot: TestBot) -> None:
         """Show help text when no subscriptions exist."""
         await maubot_test_bot.send("!subscriptions")
 
@@ -202,10 +243,12 @@ class TestSubscriptionsCommand:
         )
 
     @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
-    async def test_shows_online_stream(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_shows_online_stream(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
         """Show stream details including title and duration."""
         # Subscribe first
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -215,12 +258,11 @@ class TestSubscriptionsCommand:
 
         # Update stream state to be online with a name
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "stream.logal.dev",
-                domain="stream.logal.dev",
             name="Test Stream",
             title="Playing Games",
-                last_connect_time="2026-01-01T12:00:00Z",
+            online=True,
-            )
+            status_since="2026-01-01T12:00:00+00:00",
         )
 
         await maubot_test_bot.send("!subscriptions")
@@ -237,10 +279,46 @@ class TestSubscriptionsCommand:
         )
 
     @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
-    async def test_shows_offline_stream(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_escapes_markdown_in_stream_name_and_title(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
+        """Render stream name and title as literal text in command output."""
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
+        with aioresponses() as mocked:
+            mocked.get(
+                status_url,
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            await maubot_test_bot.send("!subscribe stream.logal.dev")
+
+        await maubot_plugin.stream_repo.update(
+            "stream.logal.dev",
+            name="*Bold* [link](https://evil.example)\nName",
+            title="`code` > quote #tag",
+            online=True,
+            status_since="2026-01-01T12:00:00+00:00",
+        )
+
+        await maubot_test_bot.send("!subscriptions")
+
+        content = maubot_test_bot.responded[1].content
+        assert "● ***Bold* [link](https://evil.example) Name**" in content.body
+        assert "  ○ Title: `code` > quote #tag" in content.body
+        assert content.formatted_body is not None
+        assert '<a href="https://evil.example">' not in content.formatted_body
+        assert (
+            "<strong>*Bold* [link](https://evil.example) Name</strong>"
+            in content.formatted_body
+        )
+        assert "Title: `code` &gt; quote #tag" in content.formatted_body
+
+    @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
+    async def test_shows_offline_stream(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
         """Show offline status for non-live streams."""
         # Subscribe first
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -250,11 +328,9 @@ class TestSubscriptionsCommand:
 
         # Update stream state to be offline
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "stream.logal.dev",
-                domain="stream.logal.dev",
             name="Test Stream",
-                last_disconnect_time="2026-01-01T10:00:00Z",
+            status_since="2026-01-01T10:00:00+00:00",
-            )
         )
 
         await maubot_test_bot.send("!subscriptions")
@@ -270,10 +346,10 @@ class TestSubscriptionsCommand:
         )
 
     async def test_shows_offline_stream_without_disconnect_time(
-        self, maubot_test_bot, maubot_plugin
+        self, maubot_test_bot: TestBot
     ) -> None:
         """Show offline status without duration before first poll completes."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -294,9 +370,11 @@ class TestSubscriptionsCommand:
             "instances, use `!unsubscribe <domain>`"
         )
 
-    async def test_shows_unknown_stream(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_shows_unknown_stream(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
         """Show unknown status when instance has been unreachable."""
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -324,17 +402,17 @@ class TestSubscriptionsCommand:
 
     @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
     async def test_shows_multiple_subscriptions(
-        self, maubot_test_bot, maubot_plugin
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
     ) -> None:
-        """List subscriptions alphabetically with mixed statuses."""
+        """List subscriptions ordered by domain with mixed statuses."""
-        # Subscribe in reverse alphabetical order to verify sorted output
+        # Subscribe in reverse domain order to verify domain-sorted output
         with aioresponses() as mocked:
             mocked.get(
-                f"https://beta.com{OWNCAST_STATUS_PATH}",
+                f"https://beta.com{_OWNCAST_STATUS_PATH}",
                 body=json.dumps(VALID_STATUS_RESPONSE).encode(),
             )
             mocked.get(
-                f"https://alpha.com{OWNCAST_STATUS_PATH}",
+                f"https://alpha.com{_OWNCAST_STATUS_PATH}",
                 body=json.dumps(VALID_STATUS_RESPONSE).encode(),
             )
             await maubot_test_bot.send("!subscribe beta.com")
@@ -342,19 +420,16 @@ class TestSubscriptionsCommand:
 
         # Set alpha online, beta offline
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "alpha.com",
-                domain="alpha.com",
             name="Alpha Stream",
             title="Streaming Live",
-                last_connect_time="2026-03-13T10:00:00Z",
+            online=True,
-            )
+            status_since="2026-03-13T10:00:00+00:00",
         )
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "beta.com",
-                domain="beta.com",
             name="Beta Stream",
-                last_disconnect_time="2026-03-12T18:00:00Z",
+            status_since="2026-03-12T18:00:00+00:00",
-            )
         )
 
         await maubot_test_bot.send("!subscriptions")
@@ -376,10 +451,11 @@ class TestSubscriptionsCommand:
         )
 
 
+@pytest.mark.usefixtures("maubot_plugin")
 class TestLiveCommand:
     """Live streams listing command end-to-end via maubot."""
 
-    async def test_no_subscriptions(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_no_subscriptions(self, maubot_test_bot: TestBot) -> None:
         """Show help text when no subscriptions exist."""
         await maubot_test_bot.send("!live")
 
@@ -390,10 +466,12 @@ class TestLiveCommand:
             "instance, use `!subscribe <domain>`"
         )
 
-    async def test_no_live_streams(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_no_live_streams(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
         """Show 'no live' message when all streams are offline."""
         # Subscribe first
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -403,11 +481,9 @@ class TestLiveCommand:
 
         # Update stream state to offline
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "stream.logal.dev",
-                domain="stream.logal.dev",
             name="Test Stream",
-                last_disconnect_time="2026-01-01T10:00:00Z",
+            status_since="2026-01-01T10:00:00+00:00",
-            )
         )
 
         await maubot_test_bot.send("!live")
@@ -420,10 +496,12 @@ class TestLiveCommand:
         )
 
     @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
-    async def test_shows_live_stream(self, maubot_test_bot, maubot_plugin) -> None:
+    async def test_shows_live_stream(
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
+    ) -> None:
         """Show live stream with title and duration."""
         # Subscribe first
-        status_url = f"https://stream.logal.dev{OWNCAST_STATUS_PATH}"
+        status_url = f"https://stream.logal.dev{_OWNCAST_STATUS_PATH}"
         with aioresponses() as mocked:
             mocked.get(
                 status_url,
@@ -433,12 +511,11 @@ class TestLiveCommand:
 
         # Update stream state to online
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "stream.logal.dev",
-                domain="stream.logal.dev",
             name="Test Stream",
             title="Playing Games",
-                last_connect_time="2026-01-01T12:00:00Z",
+            online=True,
-            )
+            status_since="2026-01-01T12:00:00+00:00",
         )
 
         await maubot_test_bot.send("!live")
@@ -454,38 +531,36 @@ class TestLiveCommand:
 
     @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
     async def test_shows_multiple_live_streams(
-        self, maubot_test_bot, maubot_plugin
+        self, maubot_test_bot: TestBot, maubot_plugin: OwncastSentry
     ) -> None:
-        """List live streams alphabetically with different durations."""
+        """List live streams ordered by domain with different durations."""
-        # Subscribe in reverse alphabetical order to verify sorted output
+        # Subscribe in reverse domain order to verify domain-sorted output
         with aioresponses() as mocked:
             mocked.get(
-                f"https://beta.com{OWNCAST_STATUS_PATH}",
+                f"https://beta.com{_OWNCAST_STATUS_PATH}",
                 body=json.dumps(VALID_STATUS_RESPONSE).encode(),
             )
             mocked.get(
-                f"https://alpha.com{OWNCAST_STATUS_PATH}",
+                f"https://alpha.com{_OWNCAST_STATUS_PATH}",
                 body=json.dumps(VALID_STATUS_RESPONSE).encode(),
             )
             await maubot_test_bot.send("!subscribe beta.com")
             await maubot_test_bot.send("!subscribe alpha.com")
 
-        # Set both streams online with different connect times
+        # Set both streams online with different status timestamps
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "alpha.com",
-                domain="alpha.com",
             name="Alpha Stream",
             title="Morning Show",
-                last_connect_time="2026-03-13T10:00:00Z",
+            online=True,
-            )
+            status_since="2026-03-13T10:00:00+00:00",
         )
         await maubot_plugin.stream_repo.update(
-            StreamState(
+            "beta.com",
-                domain="beta.com",
             name="Beta Stream",
             title="Evening Vibes",
-                last_connect_time="2026-03-13T06:00:00Z",
+            online=True,
-            )
+            status_since="2026-03-13T06:00:00+00:00",
         )
 
         await maubot_test_bot.send("!live")

tests/test_database.py

@@ -1,148 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Tests for database repository classes."""
-
-from typing import TYPE_CHECKING
-
-if TYPE_CHECKING:
-    from owncastsentry.database import StreamRepository, SubscriptionRepository
-
-
-class TestStreamExists:
-    """Stream existence checks."""
-
-    async def test_returns_true_for_existing_stream(
-        self, stream_repo: StreamRepository
-    ) -> None:
-        """Return True when the stream exists in the database."""
-        await stream_repo.create("example.com")
-        assert await stream_repo.exists("example.com") is True
-
-    async def test_returns_false_for_missing_stream(
-        self, stream_repo: StreamRepository
-    ) -> None:
-        """Return False when the stream does not exist in the database."""
-        assert await stream_repo.exists("missing.com") is False
-
-
-class TestStreamDelete:
-    """Stream record deletion."""
-
-    async def test_removes_stream_record(self, stream_repo: StreamRepository) -> None:
-        """Remove the stream record so get_by_domain returns None."""
-        await stream_repo.create("example.com")
-        await stream_repo.delete("example.com")
-        assert await stream_repo.get_by_domain("example.com") is None
-
-
-class TestGetSubscribedStreamsForRoom:
-    """Subscribed stream lookup by room."""
-
-    async def test_returns_all_domains_for_room(
-        self,
-        stream_repo: StreamRepository,
-        subscription_repo: SubscriptionRepository,
-    ) -> None:
-        """Return all domains a room is subscribed to."""
-        await stream_repo.create("alpha.com")
-        await stream_repo.create("beta.com")
-        await subscription_repo.add("alpha.com", "!room1:example.com")
-        await subscription_repo.add("beta.com", "!room1:example.com")
-
-        result = await subscription_repo.get_subscribed_streams_for_room(
-            "!room1:example.com"
-        )
-        assert sorted(result) == ["alpha.com", "beta.com"]
-
-    async def test_returns_empty_list_for_unsubscribed_room(
-        self, subscription_repo: SubscriptionRepository
-    ) -> None:
-        """Return an empty list when the room has no subscriptions."""
-        result = await subscription_repo.get_subscribed_streams_for_room(
-            "!nobody:example.com"
-        )
-        assert result == []
-
-
-class TestGetAllSubscribedDomains:
-    """Unique subscribed domain retrieval."""
-
-    async def test_returns_each_domain_once(
-        self,
-        stream_repo: StreamRepository,
-        subscription_repo: SubscriptionRepository,
-    ) -> None:
-        """Return each domain once even with multiple subscriptions."""
-        await stream_repo.create("alpha.com")
-        await subscription_repo.add("alpha.com", "!room1:example.com")
-        await subscription_repo.add("alpha.com", "!room2:example.com")
-
-        result = await subscription_repo.get_all_subscribed_domains()
-        assert result == ["alpha.com"]
-
-    async def test_returns_empty_list_with_no_subscriptions(
-        self, subscription_repo: SubscriptionRepository
-    ) -> None:
-        """Return an empty list when there are no subscriptions."""
-        result = await subscription_repo.get_all_subscribed_domains()
-        assert result == []
-
-
-class TestCountByDomain:
-    """Subscription count by domain."""
-
-    async def test_returns_correct_count(
-        self,
-        stream_repo: StreamRepository,
-        subscription_repo: SubscriptionRepository,
-    ) -> None:
-        """Return the correct subscription count for a domain."""
-        await stream_repo.create("alpha.com")
-        await subscription_repo.add("alpha.com", "!room1:example.com")
-        await subscription_repo.add("alpha.com", "!room2:example.com")
-
-        assert await subscription_repo.count_by_domain("alpha.com") == 2
-
-    async def test_returns_zero_for_unknown_domain(
-        self, subscription_repo: SubscriptionRepository
-    ) -> None:
-        """Return 0 for a domain with no subscriptions."""
-        assert await subscription_repo.count_by_domain("unknown.com") == 0
-
-
-class TestDeleteAllForDomain:
-    """Bulk subscription deletion by domain."""
-
-    async def test_deletes_all_subscriptions_and_returns_count(
-        self,
-        stream_repo: StreamRepository,
-        subscription_repo: SubscriptionRepository,
-    ) -> None:
-        """Delete all subscriptions for the domain and return the count."""
-        await stream_repo.create("alpha.com")
-        await subscription_repo.add("alpha.com", "!room1:example.com")
-        await subscription_repo.add("alpha.com", "!room2:example.com")
-
-        deleted = await subscription_repo.delete_all_for_domain("alpha.com")
-        assert deleted == 2
-
-        rooms = await subscription_repo.get_subscribed_rooms("alpha.com")
-        assert rooms == []
-
-    async def test_returns_zero_for_unknown_domain(
-        self, subscription_repo: SubscriptionRepository
-    ) -> None:
-        """Return 0 when deleting subscriptions for an unknown domain."""
-        assert await subscription_repo.delete_all_for_domain("unknown.com") == 0

tests/test_metrics.py

@@ -17,7 +17,7 @@
 import pytest
 
 from owncastsentry.metrics import ErrorSource, MetricsService, NotificationType
-from owncastsentry.models import StreamStatus
+from owncastsentry.types import StreamStatus
 from tests.conftest import generate_metrics_output
 
 
@@ -142,7 +142,7 @@ class TestSetSubscriptionCount:
 
 
 class TestSetCheckFailures:
-    """Check failure counter gauge per domain."""
+    """Consecutive check failure gauge per domain."""
 
     def test_sets_count(self) -> None:
         """Set the failure count for a domain."""
@@ -196,7 +196,7 @@ class TestResponseTimer:
         assert len(matches) == 1
 
     def test_does_not_record_on_exception(self) -> None:
-        """Do not record when the block raises an exception."""
+        """Do not record when the block raises before success() is called."""
         service = MetricsService()
         with (
             pytest.raises(ValueError, match="boom"),

tests/test_models.py

@@ -1,193 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Tests for data models."""
-
-import pytest
-
-from owncastsentry.models import StreamConfig, StreamState, StreamStatus
-from owncastsentry.utils import (
-    MAX_INSTANCE_TITLE_LENGTH,
-    MAX_STREAM_TITLE_LENGTH,
-    MAX_TAG_LENGTH,
-    UNKNOWN_STATUS_THRESHOLD,
-)
-
-
-class TestStreamStateStatus:
-    """Stream status derivation from state fields."""
-
-    @pytest.mark.parametrize(
-        ("failure_counter", "last_connect_time", "expected"),
-        [
-            pytest.param(
-                UNKNOWN_STATUS_THRESHOLD + 1,
-                None,
-                StreamStatus.UNKNOWN,
-                id="above-threshold-offline-returns-unknown",
-            ),
-            pytest.param(
-                UNKNOWN_STATUS_THRESHOLD + 1,
-                "2026-01-01T00:00:00Z",
-                StreamStatus.UNKNOWN,
-                id="above-threshold-online-returns-unknown",
-            ),
-            pytest.param(
-                0,
-                "2026-01-01T00:00:00Z",
-                StreamStatus.ONLINE,
-                id="zero-failures-with-connect-time-returns-online",
-            ),
-            pytest.param(
-                0,
-                None,
-                StreamStatus.OFFLINE,
-                id="zero-failures-no-connect-time-returns-offline",
-            ),
-            pytest.param(
-                UNKNOWN_STATUS_THRESHOLD,
-                "2026-01-01T00:00:00Z",
-                StreamStatus.ONLINE,
-                id="at-threshold-with-connect-time-returns-online",
-            ),
-            pytest.param(
-                UNKNOWN_STATUS_THRESHOLD,
-                None,
-                StreamStatus.OFFLINE,
-                id="at-threshold-no-connect-time-returns-offline",
-            ),
-        ],
-    )
-    def test_status(
-        self,
-        failure_counter: int,
-        last_connect_time: str | None,
-        expected: StreamStatus,
-    ) -> None:
-        """Return the correct status based on failure counter and connect time."""
-        state = StreamState(
-            domain="example.com",
-            failure_counter=failure_counter,
-            last_connect_time=last_connect_time,
-        )
-        assert state.status is expected
-
-
-class TestStreamStateFromApiResponse:
-    """StreamState construction from an API response dictionary."""
-
-    def test_typical_response(self) -> None:
-        """Populate all fields from a complete API response."""
-        response = {
-            "streamTitle": "My Stream",
-            "lastConnectTime": "2026-01-01T00:00:00Z",
-            "lastDisconnectTime": "2025-12-31T23:00:00Z",
-        }
-        state = StreamState.from_api_response(response, "example.com")
-        assert state.domain == "example.com"
-        assert state.title == "My Stream"
-        assert state.last_connect_time == "2026-01-01T00:00:00Z"
-        assert state.last_disconnect_time == "2025-12-31T23:00:00Z"
-        assert state.name is None
-        assert state.failure_counter == 0
-
-    def test_empty_response_defaults(self) -> None:
-        """Use defaults when optional fields are missing."""
-        state = StreamState.from_api_response({}, "bare.example.com")
-        assert state.domain == "bare.example.com"
-        assert state.title == ""
-        assert state.last_connect_time is None
-        assert state.last_disconnect_time is None
-
-    def test_title_truncation(self) -> None:
-        """Truncate the stream title to MAX_STREAM_TITLE_LENGTH."""
-        long_title = "A" * (MAX_STREAM_TITLE_LENGTH + 50)
-        response = {"streamTitle": long_title}
-        state = StreamState.from_api_response(response, "example.com")
-        assert len(state.title) == MAX_STREAM_TITLE_LENGTH
-        assert state.title == "A" * MAX_STREAM_TITLE_LENGTH
-
-
-class TestStreamStateFromDbRow:
-    """StreamState construction from a database row dictionary."""
-
-    def test_typical_row(self) -> None:
-        """Populate all fields from a complete database row."""
-        row = {
-            "domain": "example.com",
-            "name": "Test Instance",
-            "title": "Live Now",
-            "last_connect_time": "2026-01-01T00:00:00Z",
-            "last_disconnect_time": "2025-12-31T23:00:00Z",
-            "failure_counter": 3,
-        }
-        state = StreamState.from_db_row(row)
-        assert state.domain == "example.com"
-        assert state.name == "Test Instance"
-        assert state.title == "Live Now"
-        assert state.last_connect_time == "2026-01-01T00:00:00Z"
-        assert state.last_disconnect_time == "2025-12-31T23:00:00Z"
-        assert state.failure_counter == 3
-
-    def test_row_with_none_optional_fields(self) -> None:
-        """Accept None for optional fields in a database row."""
-        row = {
-            "domain": "example.com",
-            "name": None,
-            "title": None,
-            "last_connect_time": None,
-            "last_disconnect_time": None,
-            "failure_counter": 0,
-        }
-        state = StreamState.from_db_row(row)
-        assert state.domain == "example.com"
-        assert state.name is None
-        assert state.title is None
-        assert state.last_connect_time is None
-        assert state.last_disconnect_time is None
-        assert state.failure_counter == 0
-
-
-class TestStreamConfigFromApiResponse:
-    """StreamConfig construction from an API response dictionary."""
-
-    def test_typical_response(self) -> None:
-        """Populate name and tags from a complete API response."""
-        response = {"name": "My Instance", "tags": ["gaming", "music"]}
-        config = StreamConfig.from_api_response(response)
-        assert config.name == "My Instance"
-        assert config.tags == ["gaming", "music"]
-
-    def test_missing_keys_defaults(self) -> None:
-        """Use defaults when name and tags keys are missing."""
-        config = StreamConfig.from_api_response({})
-        assert config.name == ""
-        assert config.tags == []
-
-    def test_name_truncation(self) -> None:
-        """Truncate the instance name to MAX_INSTANCE_TITLE_LENGTH."""
-        long_name = "B" * (MAX_INSTANCE_TITLE_LENGTH + 50)
-        response = {"name": long_name, "tags": []}
-        config = StreamConfig.from_api_response(response)
-        assert len(config.name) == MAX_INSTANCE_TITLE_LENGTH
-        assert config.name == "B" * MAX_INSTANCE_TITLE_LENGTH
-
-    def test_tag_truncation(self) -> None:
-        """Truncate each tag to MAX_TAG_LENGTH."""
-        long_tag = "C" * (MAX_TAG_LENGTH + 10)
-        response = {"name": "", "tags": [long_tag, "short"]}
-        config = StreamConfig.from_api_response(response)
-        assert len(config.tags[0]) == MAX_TAG_LENGTH
-        assert config.tags[0] == "C" * MAX_TAG_LENGTH
-        assert config.tags[1] == "short"

tests/test_notification_service.py

@@ -14,6 +14,7 @@
 
 """Tests for the notification service."""
 
+import asyncio
 import logging
 import time
 from typing import TYPE_CHECKING
@@ -21,12 +22,15 @@ from typing import TYPE_CHECKING
 import pytest
 
 from owncastsentry.metrics import MetricsService
-from owncastsentry.notification_service import NotificationService
+from owncastsentry.notification_service import (
-from owncastsentry.utils import SECONDS_BETWEEN_NOTIFICATIONS
+    _SECONDS_BETWEEN_NOTIFICATIONS,
+    NotificationService,
+    _sanitize_for_plain_text,
+)
 from tests.conftest import _StubMatrixClient, generate_metrics_output
 
 if TYPE_CHECKING:
-    from owncastsentry.database import StreamRepository, SubscriptionRepository
+    from owncastsentry.repository import StreamRepository, SubscriptionRepository
 
 
 def _make_service(
@@ -44,6 +48,27 @@ def _make_service(
     )
 
 
+class TestSanitizeForPlainText:
+    """Plain text sanitization for notifications."""
+
+    @pytest.mark.parametrize(
+        ("input_text", "expected"),
+        [
+            pytest.param("hello world", "hello world", id="plain-text"),
+            pytest.param("line1\nline2", "line1 line2", id="newline-removed"),
+            pytest.param("line1\rline2", "line1 line2", id="carriage-return"),
+            pytest.param("line1\r\nline2", "line1 line2", id="crlf-removed"),
+            pytest.param(
+                "too   many   spaces", "too many spaces", id="spaces-collapsed"
+            ),
+            pytest.param("", "", id="empty-string"),
+        ],
+    )
+    def test_sanitizes(self, input_text: str, expected: str) -> None:
+        """Sanitize the text for safe plain-text rendering."""
+        assert _sanitize_for_plain_text(input_text) == expected
+
+
 class TestCanNotify:
     """Rate-limiting logic for notification cooldowns."""
 
@@ -75,7 +100,7 @@ class TestCanNotify:
         )
         # Subtract an extra second to ensure the cooldown has fully elapsed
         service.notification_timers_cache["example.com"] = (
-            time.monotonic() - SECONDS_BETWEEN_NOTIFICATIONS - 1
+            time.monotonic() - _SECONDS_BETWEEN_NOTIFICATIONS - 1
         )
         assert service._can_notify("example.com") is True
 
@@ -103,6 +128,35 @@ class TestGetLastNotificationTime:
         assert service.get_last_notification_time("unknown.com") == 0
 
 
+class TestClearNotificationState:
+    """Notification cache cleanup for deleted domains."""
+
+    def test_clears_cached_notification_time(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Remove cached notification state for a domain."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        service.notification_timers_cache["example.com"] = 12345.0
+
+        service.clear_notification_state("example.com")
+
+        assert service.get_last_notification_time("example.com") == 0
+
+    def test_missing_domain_is_ignored(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Ignore cleanup for a domain with no cached state."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+
+        service.clear_notification_state("unknown.com")
+
+        assert service.get_last_notification_time("unknown.com") == 0
+
+
 class TestFormatMessage:
     """Notification message formatting."""
 
@@ -202,6 +256,7 @@ class TestFormatMessage:
         title: str,
         domain: str,
         tags: list[str],
+        *,
         title_change: bool,
         expected: str,
         subscription_repo: SubscriptionRepository,
@@ -210,12 +265,14 @@ class TestFormatMessage:
         service = _make_service(
             client=_StubMatrixClient(), subscription_repo=subscription_repo
         )
-        result = service._format_message(name, title, domain, tags, title_change)
+        result = service._format_message(
+            name, title, domain, tags, title_change=title_change
+        )
         assert result == expected
 
 
 class TestNotifyStreamLive:
-    """End-to-end notification sending."""
+    """Live notification sending behavior."""
 
     async def test_sends_to_all_subscribed_rooms(
         self,
@@ -246,6 +303,74 @@ class TestNotifyStreamLive:
         for msg in client.sent_messages:
             assert msg.content.body == expected_body
 
+    async def test_records_cooldown_after_success(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a cooldown after at least one room receives a notification."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+
+        before_send = time.monotonic()
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert service.get_last_notification_time("example.com") >= before_send
+
+    async def test_no_cooldown_when_no_subscribed_rooms(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Do not record a cooldown if no room receives the notification."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert len(client.sent_messages) == 0
+        assert service.get_last_notification_time("example.com") == 0
+
+    async def test_no_cooldown_when_all_deliveries_fail(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Do not record a cooldown if every room delivery fails."""
+        client = _StubMatrixClient()
+        client.should_fail_for_rooms.add("!bad:matrix.org")
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!bad:matrix.org")
+
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert len(client.sent_messages) == 0
+        assert service.get_last_notification_time("example.com") == 0
+
+    async def test_counts_cancelled_delivery_as_failure(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Count a cancelled delivery result as a failure."""
+        client = _StubMatrixClient()
+
+        async def send_message(_room_id: str, _content: object) -> None:
+            raise asyncio.CancelledError
+
+        client.send_message = send_message
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert service.get_last_notification_time("example.com") == 0
+
     async def test_skips_when_rate_limited(
         self,
         stream_repo: StreamRepository,
@@ -268,7 +393,7 @@ class TestNotifyStreamLive:
         stream_repo: StreamRepository,
         subscription_repo: SubscriptionRepository,
     ) -> None:
-        """Send to remaining rooms after a delivery failure."""
+        """Deliver to other subscribed rooms when one room delivery fails."""
         client = _StubMatrixClient()
         client.should_fail_for_rooms.add("!bad:matrix.org")
         service = _make_service(client=client, subscription_repo=subscription_repo)

tests/test_owncast_client.py

@@ -16,13 +16,20 @@
 
 import json
 import logging
+from datetime import UTC, datetime
 from typing import TYPE_CHECKING
 
 import pytest
+import time_machine
 from aioresponses import aioresponses
 
 from owncastsentry.metrics import MetricsService
-from owncastsentry.owncast_client import OwncastClient
+from owncastsentry.owncast_client import (
+    _MAX_JSON_RESPONSE_BYTES,
+    OwncastClient,
+    _read_limited_response_body,
+    _user_agent,
+)
 from tests.conftest import (
     VALID_CONFIG_RESPONSE,
     VALID_STATUS_RESPONSE,
@@ -33,6 +40,32 @@ if TYPE_CHECKING:
     from collections.abc import AsyncIterator
 
 
+class _ChunkedContent:
+    """Fake aiohttp response content that yields predefined chunks."""
+
+    def __init__(self, chunks: tuple[bytes, ...]) -> None:
+        """Store chunks to return from iter_chunked."""
+        self._chunks = chunks
+
+    async def iter_chunked(self, _size: int) -> AsyncIterator[bytes]:
+        """Yield chunks using the interface aiohttp exposes."""
+        for chunk in self._chunks:
+            yield chunk
+
+
+class _ChunkedResponse:
+    """Fake aiohttp response with chunked content."""
+
+    def __init__(
+        self,
+        chunks: tuple[bytes, ...],
+        content_length: int | None = None,
+    ) -> None:
+        """Store the content stream and optional Content-Length value."""
+        self.content = _ChunkedContent(chunks)
+        self.content_length = content_length
+
+
 @pytest.fixture
 async def owncast_client() -> AsyncIterator[OwncastClient]:
     """Create an OwncastClient and close it after the test."""
@@ -45,13 +78,83 @@ async def owncast_client() -> AsyncIterator[OwncastClient]:
     await client.close()
 
 
-class TestGetStreamState:
+class TestUserAgent:
-    """Stream state retrieval from the status API."""
+    """User-Agent header construction."""
 
+    @pytest.mark.parametrize(
+        ("version", "expected"),
+        [
+            pytest.param(
+                "1.2.3",
+                "OwncastSentry/1.2.3 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
+                id="semver",
+            ),
+            pytest.param(
+                "0.0.0",
+                "OwncastSentry/0.0.0 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
+                id="zeroed",
+            ),
+            pytest.param(
+                "1.1.1.dev10+gf0146d061.d20260313",
+                "OwncastSentry/1.1.1.dev10+gf0146d061.d20260313 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
+                id="dev-version",
+            ),
+        ],
+    )
+    def test_user_agent(self, version: str, expected: str) -> None:
+        """Build a correctly formatted User-Agent header."""
+        assert _user_agent(version) == expected
+
+
+class TestReadLimitedResponseBody:
+    """Bounded response body reading."""
+
+    async def test_reads_all_chunks_before_returning(self) -> None:
+        """Return the full body when JSON arrives in multiple chunks."""
+        response = _ChunkedResponse(
+            (
+                b'{"streamTitle":',
+                b'"hello","online":true}',
+            )
+        )
+
+        result = await _read_limited_response_body(response)
+
+        assert result == bytearray(b'{"streamTitle":"hello","online":true}')
+
+    async def test_returns_none_when_content_length_is_too_large(self) -> None:
+        """Return None when Content-Length is already over the limit."""
+        response = _ChunkedResponse(
+            (),
+            content_length=_MAX_JSON_RESPONSE_BYTES + 1,
+        )
+
+        result = await _read_limited_response_body(response)
+
+        assert result is None
+
+    async def test_returns_none_when_streamed_body_is_too_large(self) -> None:
+        """Return None when chunked content grows past the limit."""
+        response = _ChunkedResponse(
+            (
+                b"x" * _MAX_JSON_RESPONSE_BYTES,
+                b"x",
+            )
+        )
+
+        result = await _read_limited_response_body(response)
+
+        assert result is None
+
+
+class TestGetStreamState:
+    """Stream observation retrieval from the status API."""
+
+    @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
     async def test_returns_state_on_success(
         self, owncast_client: OwncastClient
     ) -> None:
-        """Return a StreamState with correct fields on a valid 200 response."""
+        """Return a StreamStateObservation with correct fields on a valid response."""
         with aioresponses() as mocked:
             mocked.get(
                 "https://stream.logal.dev/api/status",
@@ -65,14 +168,14 @@ class TestGetStreamState:
             result.title
             == "I think I can do this... Let's start a nuclear reaction - Playing Nucleares!"  # noqa: E501
         )
-        assert result.last_connect_time is None
+        assert result.online is False
-        assert result.last_disconnect_time == "2026-03-04T21:05:32-05:00"
+        assert result.observed_at == "2026-03-13T12:00:00+00:00"
 
     async def test_returns_none_on_missing_field(
         self, owncast_client: OwncastClient
     ) -> None:
         """Return None when the response is missing required fields."""
-        incomplete = {"streamTitle": "Test Stream", "online": True}
+        incomplete = {"streamTitle": "Test Stream"}
         with aioresponses() as mocked:
             mocked.get(
                 "https://stream.logal.dev/api/status",
@@ -82,6 +185,23 @@ class TestGetStreamState:
 
         assert result is None
 
+    async def test_returns_none_on_invalid_field_type(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response has malformed field types."""
+        malformed = {
+            **VALID_STATUS_RESPONSE,
+            "streamTitle": 123,
+        }
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=json.dumps(malformed).encode(),
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is None
+
     async def test_returns_none_on_invalid_json(
         self, owncast_client: OwncastClient
     ) -> None:
@@ -95,6 +215,32 @@ class TestGetStreamState:
 
         assert result is None
 
+    async def test_returns_none_on_non_object_json(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response JSON is not an object."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=json.dumps([]).encode(),
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is None
+
+    async def test_returns_none_on_oversized_json(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response body is too large."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=b" " * (_MAX_JSON_RESPONSE_BYTES + 1),
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is None
+
     async def test_returns_none_on_non_200(self, owncast_client: OwncastClient) -> None:
         """Return None when the response status is not 200."""
         with aioresponses() as mocked:
@@ -126,7 +272,7 @@ class TestGetStreamConfig:
     async def test_returns_config_on_success(
         self, owncast_client: OwncastClient
     ) -> None:
-        """Return a StreamConfig with correct fields on a valid 200 response."""
+        """Return a StreamConfigObservation with fields from a valid response."""
         with aioresponses() as mocked:
             mocked.get(
                 "https://stream.logal.dev/api/config",
@@ -136,7 +282,7 @@ class TestGetStreamConfig:
 
         assert result is not None
         assert result.name == "LogalDeveloper's Live Stream"
-        assert result.tags == [
+        assert result.tags == (
             "video games",
             "chatting",
             "casual",
@@ -144,7 +290,7 @@ class TestGetStreamConfig:
             "streaming",
             "owncast",
             "variety",
-        ]
+        )
 
     async def test_returns_none_on_invalid_json(
         self, owncast_client: OwncastClient
@@ -159,6 +305,49 @@ class TestGetStreamConfig:
 
         assert result is None
 
+    async def test_returns_none_on_non_object_json(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response JSON is not an object."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                body=json.dumps([]).encode(),
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is None
+
+    async def test_returns_none_on_invalid_field_type(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response has malformed field types."""
+        malformed = {
+            **VALID_CONFIG_RESPONSE,
+            "tags": "gaming",
+        }
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                body=json.dumps(malformed).encode(),
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is None
+
+    async def test_returns_none_on_oversized_json(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response body is too large."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                body=b" " * (_MAX_JSON_RESPONSE_BYTES + 1),
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is None
+
     async def test_returns_none_on_non_200(self, owncast_client: OwncastClient) -> None:
         """Return None when the response status is not 200."""
         with aioresponses() as mocked:
@@ -215,7 +404,7 @@ class TestValidateInstance:
 
 
 class TestResponseTimeMetrics:
-    """Response time histogram recording."""
+    """Response time gauge recording."""
 
     async def test_records_on_success(self) -> None:
         """Record response time on a successful request."""
@@ -225,6 +414,7 @@ class TestResponseTimeMetrics:
             version="0.0.0",
             metrics=metrics,
         )
+        try:
             with aioresponses() as mocked:
                 mocked.get(
                     "https://example.com/api/status",
@@ -233,6 +423,7 @@ class TestResponseTimeMetrics:
                 await client.get_stream_state("example.com")
             output = generate_metrics_output(metrics)
             assert 'owncastsentry_api_response_seconds{domain="example.com"}' in output
+        finally:
             await client.close()
 
     async def test_no_observation_on_failure(self) -> None:
@@ -243,6 +434,7 @@ class TestResponseTimeMetrics:
             version="0.0.0",
             metrics=metrics,
         )
+        try:
             with aioresponses() as mocked:
                 mocked.get(
                     "https://example.com/api/status",
@@ -250,7 +442,10 @@ class TestResponseTimeMetrics:
                 )
                 await client.get_stream_state("example.com")
             output = generate_metrics_output(metrics)
-        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+            assert (
+                'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+            )
+        finally:
             await client.close()
 
     async def test_no_observation_on_connection_error(self) -> None:
@@ -261,6 +456,7 @@ class TestResponseTimeMetrics:
             version="0.0.0",
             metrics=metrics,
         )
+        try:
             with aioresponses() as mocked:
                 mocked.get(
                     "https://example.com/api/status",
@@ -268,7 +464,10 @@ class TestResponseTimeMetrics:
                 )
                 await client.get_stream_state("example.com")
             output = generate_metrics_output(metrics)
-        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+            assert (
+                'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+            )
+        finally:
             await client.close()
 
 

tests/test_repository.py

@@ -0,0 +1,483 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for database repository classes."""
+
+from typing import TYPE_CHECKING
+
+import pytest
+
+from owncastsentry.repository import _normalize_legacy_status_since
+from owncastsentry.types import (
+    UNKNOWN_STATUS_THRESHOLD,
+    AlreadySubscribedError,
+    NotSubscribedError,
+)
+
+if TYPE_CHECKING:
+    from mautrix.util.async_db import Database
+
+    from owncastsentry.repository import StreamRepository, SubscriptionRepository
+
+
+class TestStreamSchema:
+    """Streams table schema after migrations."""
+
+    async def test_uses_online_and_status_since_columns(
+        self, database: Database
+    ) -> None:
+        """Create the current schema without legacy connect/disconnect columns."""
+        async with database.acquire() as conn:
+            rows = await conn.fetch("PRAGMA table_info(streams)")
+
+        assert [row["name"] for row in rows] == [
+            "domain",
+            "name",
+            "title",
+            "online",
+            "status_since",
+            "failure_counter",
+        ]
+
+
+class TestNormalizeLegacyStatusSince:
+    """Legacy timestamp normalization used by the v4 migration."""
+
+    @pytest.mark.parametrize(
+        ("value", "expected"),
+        [
+            pytest.param(
+                "2026-05-21T19:06:24Z",
+                "2026-05-21T19:06:24+00:00",
+                id="utc-z",
+            ),
+            pytest.param(
+                "2026-05-21T19:38:40+02:00",
+                "2026-05-21T17:38:40+00:00",
+                id="positive-offset",
+            ),
+            pytest.param(
+                "2026-05-17T21:23:27-04:00",
+                "2026-05-18T01:23:27+00:00",
+                id="negative-offset",
+            ),
+            pytest.param("", None, id="blank"),
+            pytest.param(None, None, id="null"),
+            pytest.param("not a timestamp", None, id="malformed"),
+        ],
+    )
+    def test_normalizes_parseable_aware_timestamps(
+        self, value: str | None, expected: str | None
+    ) -> None:
+        """Normalize parseable legacy values and ignore unusable ones."""
+        assert _normalize_legacy_status_since(value) == expected
+
+
+class TestStreamExists:
+    """Stream existence checks."""
+
+    async def test_returns_true_for_existing_stream(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Return True when the stream exists in the database."""
+        await stream_repo.create("example.com")
+        assert await stream_repo.exists("example.com") is True
+
+    async def test_returns_false_for_missing_stream(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Return False when the stream does not exist in the database."""
+        assert await stream_repo.exists("missing.com") is False
+
+
+class TestStreamCreate:
+    """Stream creation behavior."""
+
+    async def test_returns_true_when_created(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Return True when a stream row is inserted."""
+        assert await stream_repo.create("example.com") is True
+
+    async def test_returns_false_when_existing(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Return False when a stream row already exists."""
+        await stream_repo.create("example.com")
+        assert await stream_repo.create("example.com") is False
+
+
+class TestStreamDelete:
+    """Stream record deletion."""
+
+    async def test_removes_stream_record(self, stream_repo: StreamRepository) -> None:
+        """Remove the stream record so get_by_domain returns None."""
+        await stream_repo.create("example.com")
+        await stream_repo.delete("example.com")
+        assert await stream_repo.get_by_domain("example.com") is None
+
+
+class TestStreamUpdate:
+    """Partial stream state updates."""
+
+    async def test_updates_only_supplied_fields(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Update supplied fields while leaving omitted fields unchanged."""
+        await stream_repo.create("example.com")
+        await stream_repo.update(
+            "example.com",
+            name="Original Name",
+            title="Original Title",
+            online=True,
+            status_since="2026-01-01T12:00:00+00:00",
+        )
+
+        await stream_repo.update("example.com", title="Updated Title")
+
+        state = await stream_repo.get_by_domain("example.com")
+        assert state is not None
+        assert state.name == "Original Name"
+        assert state.title == "Updated Title"
+        assert state.online is True
+        assert state.status_since == "2026-01-01T12:00:00+00:00"
+
+    async def test_can_set_nullable_field_to_null(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Treat None as a supplied NULL value, not an omitted field."""
+        await stream_repo.create("example.com")
+        await stream_repo.update(
+            "example.com",
+            name="Original Name",
+            title="Original Title",
+            status_since="2026-01-01T12:00:00+00:00",
+        )
+
+        await stream_repo.update("example.com", title=None)
+
+        state = await stream_repo.get_by_domain("example.com")
+        assert state is not None
+        assert state.name == "Original Name"
+        assert state.title is None
+        assert state.status_since == "2026-01-01T12:00:00+00:00"
+
+    async def test_accepts_no_supplied_fields(
+        self, stream_repo: StreamRepository
+    ) -> None:
+        """Leave the row unchanged when no partial fields are supplied."""
+        await stream_repo.create("example.com")
+        await stream_repo.update(
+            "example.com",
+            title="Original Title",
+            status_since="2026-01-01T12:00:00+00:00",
+        )
+
+        await stream_repo.update("example.com")
+
+        state = await stream_repo.get_by_domain("example.com")
+        assert state is not None
+        assert state.title == "Original Title"
+        assert state.status_since == "2026-01-01T12:00:00+00:00"
+
+
+class TestGetSubscribedStreamsForRoom:
+    """Subscribed stream lookup by room."""
+
+    async def test_returns_all_domains_for_room(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return all domains a room is subscribed to."""
+        await stream_repo.create("alpha.com")
+        await stream_repo.create("beta.com")
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.add("beta.com", "!room1:example.com")
+
+        result = await subscription_repo.get_subscribed_streams_for_room(
+            "!room1:example.com"
+        )
+        assert sorted(result) == ["alpha.com", "beta.com"]
+
+    async def test_returns_empty_list_for_unsubscribed_room(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return an empty list when the room has no subscriptions."""
+        result = await subscription_repo.get_subscribed_streams_for_room(
+            "!nobody:example.com"
+        )
+        assert result == []
+
+
+class TestHasRoomSubscriptions:
+    """Room subscription existence checks."""
+
+    async def test_returns_true_for_subscribed_room(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return True when the room has at least one subscription."""
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+
+        assert await subscription_repo.has_room_subscriptions("!room1:example.com")
+
+    async def test_returns_false_for_unsubscribed_room(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return False when the room has no subscriptions."""
+        assert not await subscription_repo.has_room_subscriptions("!nobody:example.com")
+
+
+class TestGetRoomSubscriptions:
+    """Resolved room subscription lookup."""
+
+    async def test_returns_sorted_stream_states_and_skips_missing_rows(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return sorted resolved subscriptions and skip missing stream rows."""
+        await stream_repo.create("beta.example")
+        await stream_repo.update("beta.example", name="Beta")
+        await stream_repo.create("alpha.example")
+        await stream_repo.update("alpha.example", name="Alpha")
+        await subscription_repo.add("beta.example", "!room:example.com")
+        await subscription_repo.add("missing.example", "!room:example.com")
+        await subscription_repo.add("alpha.example", "!room:example.com")
+
+        subscriptions = await subscription_repo.get_room_subscriptions(
+            "!room:example.com"
+        )
+
+        assert [subscription.domain for subscription in subscriptions] == [
+            "alpha.example",
+            "beta.example",
+        ]
+        assert [subscription.stream_state.name for subscription in subscriptions] == [
+            "Alpha",
+            "Beta",
+        ]
+
+    async def test_returns_empty_list_for_unsubscribed_room(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return an empty list when the room has no resolved subscriptions."""
+        subscriptions = await subscription_repo.get_room_subscriptions(
+            "!nobody:example.com"
+        )
+        assert subscriptions == []
+
+
+class TestGetLiveRoomSubscriptions:
+    """Resolved live room subscription lookup."""
+
+    async def test_returns_online_streams_and_skips_inactive_states(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return only streams whose derived status is ONLINE."""
+        await stream_repo.create("offline.example")
+        await stream_repo.update(
+            "offline.example",
+            name="Offline",
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        await stream_repo.create("online.example")
+        await stream_repo.update(
+            "online.example",
+            name="Online",
+            online=True,
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        await stream_repo.create("unknown.example")
+        await stream_repo.update(
+            "unknown.example",
+            name="Unknown",
+            online=True,
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        for _ in range(UNKNOWN_STATUS_THRESHOLD + 1):
+            await stream_repo.increment_failure_counter("unknown.example")
+
+        await subscription_repo.add("offline.example", "!room:example.com")
+        await subscription_repo.add("online.example", "!room:example.com")
+        await subscription_repo.add("unknown.example", "!room:example.com")
+
+        subscriptions = await subscription_repo.get_live_room_subscriptions(
+            "!room:example.com"
+        )
+
+        assert [subscription.domain for subscription in subscriptions] == [
+            "online.example"
+        ]
+
+    async def test_returns_empty_list_for_room_with_no_live_streams(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return an empty list when no subscribed streams are live."""
+        await stream_repo.create("offline.example")
+        await subscription_repo.add("offline.example", "!room:example.com")
+
+        subscriptions = await subscription_repo.get_live_room_subscriptions(
+            "!room:example.com"
+        )
+
+        assert subscriptions == []
+
+
+class TestAddSubscription:
+    """Subscription creation behavior."""
+
+    async def test_adds_subscription(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Add a subscription row."""
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        assert await subscription_repo.get_subscribed_rooms("alpha.com") == [
+            "!room1:example.com"
+        ]
+
+    async def test_raises_when_existing(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Raise AlreadySubscribedError when a subscription already exists."""
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        with pytest.raises(AlreadySubscribedError):
+            await subscription_repo.add("alpha.com", "!room1:example.com")
+
+
+class TestRemoveSubscription:
+    """Subscription removal behavior."""
+
+    async def test_removes_subscription(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Remove an existing subscription row."""
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.remove("alpha.com", "!room1:example.com")
+        assert await subscription_repo.get_subscribed_rooms("alpha.com") == []
+
+    async def test_raises_when_missing(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Raise NotSubscribedError when no subscription exists."""
+        with pytest.raises(NotSubscribedError):
+            await subscription_repo.remove("alpha.com", "!room1:example.com")
+
+
+class TestGetAllSubscribedDomains:
+    """Unique subscribed domain retrieval."""
+
+    async def test_returns_each_domain_once(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return each domain once even with multiple subscriptions."""
+        await stream_repo.create("alpha.com")
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.add("alpha.com", "!room2:example.com")
+
+        result = await subscription_repo.get_all_subscribed_domains()
+        assert result == ["alpha.com"]
+
+    async def test_returns_empty_list_with_no_subscriptions(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return an empty list when there are no subscriptions."""
+        result = await subscription_repo.get_all_subscribed_domains()
+        assert result == []
+
+
+class TestCountByDomain:
+    """Subscription count by domain."""
+
+    async def test_returns_correct_count(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return the correct subscription count for a domain."""
+        await stream_repo.create("alpha.com")
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.add("alpha.com", "!room2:example.com")
+
+        assert await subscription_repo.count_by_domain("alpha.com") == 2
+
+    async def test_returns_zero_for_unknown_domain(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return 0 for a domain with no subscriptions."""
+        assert await subscription_repo.count_by_domain("unknown.com") == 0
+
+
+class TestCountByDomains:
+    """Bulk subscription counts by domain."""
+
+    async def test_returns_counts_for_requested_domains(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return counts for requested domains and zero for missing domains."""
+        await stream_repo.create("alpha.com")
+        await stream_repo.create("beta.com")
+        await stream_repo.create("ignored.com")
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.add("alpha.com", "!room2:example.com")
+        await subscription_repo.add("beta.com", "!room3:example.com")
+        await subscription_repo.add("ignored.com", "!room4:example.com")
+
+        assert await subscription_repo.count_by_domains(
+            ["beta.com", "missing.com", "alpha.com"]
+        ) == {
+            "beta.com": 1,
+            "missing.com": 0,
+            "alpha.com": 2,
+        }
+
+    async def test_returns_empty_dict_for_empty_domain_list(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return an empty mapping when no domains are requested."""
+        assert await subscription_repo.count_by_domains([]) == {}
+
+
+class TestDeleteAllForDomain:
+    """Bulk subscription deletion by domain."""
+
+    async def test_deletes_all_subscriptions_and_returns_count(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Delete all subscriptions for the domain and return the count."""
+        await stream_repo.create("alpha.com")
+        await subscription_repo.add("alpha.com", "!room1:example.com")
+        await subscription_repo.add("alpha.com", "!room2:example.com")
+
+        deleted = await subscription_repo.delete_all_for_domain("alpha.com")
+        assert deleted == 2
+
+        rooms = await subscription_repo.get_subscribed_rooms("alpha.com")
+        assert rooms == []
+
+    async def test_returns_zero_for_unknown_domain(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return 0 when deleting subscriptions for an unknown domain."""
+        assert await subscription_repo.delete_all_for_domain("unknown.com") == 0

tests/test_subscription_manager.py

@@ -0,0 +1,284 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for subscription manager business logic."""
+
+import logging
+from typing import TYPE_CHECKING
+
+import pytest
+
+from owncastsentry.subscription_manager import SubscriptionManager, _domainify
+from owncastsentry.types import (
+    UNKNOWN_STATUS_THRESHOLD,
+    AlreadySubscribedError,
+    InvalidOwncastInstanceError,
+    NotSubscribedError,
+)
+
+if TYPE_CHECKING:
+    from owncastsentry.repository import StreamRepository, SubscriptionRepository
+
+
+class _StubOwncastClient:
+    """Owncast client stub for validation-only manager tests."""
+
+    def __init__(self, *, valid: bool = True) -> None:
+        """Initialize the stub with a fixed validation result."""
+        self.valid = valid
+        self.validated_domains: list[str] = []
+
+    async def validate_instance(self, domain: str) -> bool:
+        """Record the domain and return the configured validation result."""
+        self.validated_domains.append(domain)
+        return self.valid
+
+
+@pytest.fixture
+def owncast_client() -> _StubOwncastClient:
+    """Return a validation-only Owncast client stub."""
+    return _StubOwncastClient()
+
+
+@pytest.fixture
+def manager(
+    owncast_client: _StubOwncastClient,
+    stream_repo: StreamRepository,
+    subscription_repo: SubscriptionRepository,
+) -> SubscriptionManager:
+    """SubscriptionManager built directly for unit tests."""
+    return SubscriptionManager(
+        owncast_client=owncast_client,  # type: ignore[arg-type]
+        stream_repo=stream_repo,
+        subscription_repo=subscription_repo,
+        logger=logging.getLogger("test"),
+    )
+
+
+class TestDomainify:
+    """Domain extraction and sanitization from user input."""
+
+    @pytest.mark.parametrize(
+        ("input_url", "expected"),
+        [
+            pytest.param("example.com", "example.com", id="bare-domain"),
+            pytest.param("  example.com  ", "example.com", id="surrounding-whitespace"),
+            pytest.param("https://example.com", "example.com", id="https-url"),
+            pytest.param("http://example.com", "example.com", id="http-url"),
+            pytest.param("https://example.com:8080", "example.com", id="url-with-port"),
+            pytest.param(
+                "https://example.com/path/to/page",
+                "example.com",
+                id="url-with-path",
+            ),
+            pytest.param(
+                "user@stream.logal.dev",
+                "stream.logal.dev",
+                id="email-style",
+            ),
+            pytest.param(
+                "matrix@notify@stream.logal.dev",
+                "stream.logal.dev",
+                id="last-at-sign-wins",
+            ),
+            pytest.param("EXAMPLE.COM", "example.com", id="uppercase"),
+            pytest.param("exam!ple.com", "example.com", id="special-chars-stripped"),
+            pytest.param(".example.com.", "example.com", id="leading-trailing-dots"),
+            pytest.param("-example.com-", "example.com", id="leading-trailing-hyphens"),
+            pytest.param(
+                "sub.domain.example.com",
+                "sub.domain.example.com",
+                id="subdomain",
+            ),
+        ],
+    )
+    def test_extracts_domain(self, input_url: str, expected: str) -> None:
+        """Extract and sanitize the domain from various input formats."""
+        assert _domainify(input_url) == expected
+
+
+class TestManagerSubscribe:
+    """SubscriptionManager subscribe workflow."""
+
+    async def test_first_subscription_validates_and_creates_stream(
+        self,
+        manager: SubscriptionManager,
+        owncast_client: _StubOwncastClient,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """First subscription validates the instance and creates stream state."""
+        domain = await manager.subscribe(
+            "!room:example.com", "https://Stream.Example/foo"
+        )
+
+        assert domain == "stream.example"
+        assert owncast_client.validated_domains == ["stream.example"]
+        assert await stream_repo.exists("stream.example") is True
+        assert await subscription_repo.get_subscribed_rooms("stream.example") == [
+            "!room:example.com"
+        ]
+
+    async def test_invalid_first_subscription_raises(
+        self,
+        manager: SubscriptionManager,
+        owncast_client: _StubOwncastClient,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Invalid first-time Owncast validation raises a domain error."""
+        owncast_client.valid = False
+
+        with pytest.raises(InvalidOwncastInstanceError) as exc_info:
+            await manager.subscribe("!room:example.com", "bad.example")
+
+        assert exc_info.value.domain == "bad.example"
+        assert owncast_client.validated_domains == ["bad.example"]
+        assert await stream_repo.exists("bad.example") is False
+        assert await subscription_repo.get_subscribed_rooms("bad.example") == []
+
+    async def test_duplicate_subscription_raises(
+        self,
+        manager: SubscriptionManager,
+        owncast_client: _StubOwncastClient,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Duplicate room subscription raises AlreadySubscribedError."""
+        await manager.subscribe("!room:example.com", "stream.example")
+
+        with pytest.raises(AlreadySubscribedError) as exc_info:
+            await manager.subscribe("!room:example.com", "stream.example")
+
+        assert exc_info.value.domain == "stream.example"
+        assert owncast_client.validated_domains == ["stream.example"]
+        assert await subscription_repo.get_subscribed_rooms("stream.example") == [
+            "!room:example.com"
+        ]
+
+    async def test_existing_stream_new_room_skips_validation(
+        self,
+        manager: SubscriptionManager,
+        owncast_client: _StubOwncastClient,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Domains with existing subscriptions skip remote validation."""
+        await manager.subscribe("!room1:example.com", "stream.example")
+        owncast_client.valid = False
+
+        domain = await manager.subscribe("!room2:example.com", "stream.example")
+
+        assert domain == "stream.example"
+        assert owncast_client.validated_domains == ["stream.example"]
+        rooms = await subscription_repo.get_subscribed_rooms("stream.example")
+        assert sorted(rooms) == [
+            "!room1:example.com",
+            "!room2:example.com",
+        ]
+
+
+class TestManagerUnsubscribe:
+    """SubscriptionManager unsubscribe workflow."""
+
+    async def test_removes_existing_subscription(
+        self,
+        manager: SubscriptionManager,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Existing room subscription is removed and its domain is returned."""
+        await manager.subscribe("!room:example.com", "stream.example")
+
+        domain = await manager.unsubscribe("!room:example.com", "stream.example")
+
+        assert domain == "stream.example"
+        assert await subscription_repo.get_subscribed_rooms("stream.example") == []
+
+    async def test_missing_subscription_raises(
+        self,
+        manager: SubscriptionManager,
+    ) -> None:
+        """Removing a non-existent subscription raises NotSubscribedError."""
+        with pytest.raises(NotSubscribedError) as exc_info:
+            await manager.unsubscribe("!room:example.com", "missing.example")
+
+        assert exc_info.value.domain == "missing.example"
+
+
+class TestManagerListings:
+    """SubscriptionManager room listing behavior."""
+
+    async def test_list_room_subscriptions_returns_sorted_stream_states(
+        self,
+        manager: SubscriptionManager,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Return sorted room subscriptions and skip missing stream rows."""
+        await stream_repo.create("beta.example")
+        await stream_repo.update("beta.example", name="Beta")
+        await stream_repo.create("alpha.example")
+        await stream_repo.update("alpha.example", name="Alpha")
+        await subscription_repo.add("beta.example", "!room:example.com")
+        await subscription_repo.add("missing.example", "!room:example.com")
+        await subscription_repo.add("alpha.example", "!room:example.com")
+
+        subscriptions = await manager.list_room_subscriptions("!room:example.com")
+
+        assert [subscription.domain for subscription in subscriptions] == [
+            "alpha.example",
+            "beta.example",
+        ]
+        assert [subscription.stream_state.name for subscription in subscriptions] == [
+            "Alpha",
+            "Beta",
+        ]
+
+    async def test_list_live_room_subscriptions_filters_online_streams(
+        self,
+        manager: SubscriptionManager,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Live listing includes only subscriptions with ONLINE stream status."""
+        await stream_repo.create("offline.example")
+        await stream_repo.update(
+            "offline.example",
+            name="Offline",
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        await stream_repo.create("online.example")
+        await stream_repo.update(
+            "online.example",
+            name="Online",
+            online=True,
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        await stream_repo.create("unknown.example")
+        await stream_repo.update(
+            "unknown.example",
+            name="Unknown",
+            online=True,
+            status_since="2026-01-01T00:00:00+00:00",
+        )
+        for _ in range(UNKNOWN_STATUS_THRESHOLD + 1):
+            await stream_repo.increment_failure_counter("unknown.example")
+
+        await subscription_repo.add("offline.example", "!room:example.com")
+        await subscription_repo.add("online.example", "!room:example.com")
+        await subscription_repo.add("unknown.example", "!room:example.com")
+
+        subscriptions = await manager.list_live_room_subscriptions("!room:example.com")
+
+        assert [subscription.domain for subscription in subscriptions] == [
+            "online.example"
+        ]

tests/test_types.py

@@ -0,0 +1,388 @@
+# Copyright 2026 Logan Fick
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for data models."""
+
+from dataclasses import FrozenInstanceError
+from datetime import UTC, datetime, timedelta, timezone
+
+import pytest
+import time_machine
+
+from owncastsentry.types import (
+    _MAX_INSTANCE_TITLE_LENGTH,
+    _MAX_STREAM_TITLE_LENGTH,
+    _MAX_TAG_LENGTH,
+    UNKNOWN_STATUS_THRESHOLD,
+    AlreadySubscribedError,
+    InvalidApiResponseError,
+    InvalidOwncastInstanceError,
+    NotSubscribedError,
+    RoomSubscription,
+    StreamConfigObservation,
+    StreamState,
+    StreamStateObservation,
+    StreamStatus,
+    SubscriptionError,
+    UpdateResult,
+    _truncate,
+    format_status_since,
+)
+
+
+class TestTruncate:
+    """Text truncation to a maximum length."""
+
+    @pytest.mark.parametrize(
+        ("text", "max_length", "expected"),
+        [
+            pytest.param("hello", 10, "hello", id="under-limit"),
+            pytest.param("hello", 5, "hello", id="exact-limit"),
+            pytest.param("hello world", 5, "hello", id="over-limit"),
+            pytest.param("", 5, "", id="empty-string"),
+        ],
+    )
+    def test_truncates(self, text: str, max_length: int, expected: str) -> None:
+        """Return text unchanged within the limit and truncate over-limit text."""
+        assert _truncate(text, max_length) == expected
+
+
+class TestStreamStateStatus:
+    """Stream status derivation from state fields."""
+
+    @pytest.mark.parametrize(
+        ("failure_counter", "online", "expected"),
+        [
+            pytest.param(
+                UNKNOWN_STATUS_THRESHOLD + 1,
+                False,
+                StreamStatus.UNKNOWN,
+                id="above-threshold-offline-returns-unknown",
+            ),
+            pytest.param(
+                UNKNOWN_STATUS_THRESHOLD + 1,
+                True,
+                StreamStatus.UNKNOWN,
+                id="above-threshold-online-returns-unknown",
+            ),
+            pytest.param(
+                0,
+                True,
+                StreamStatus.ONLINE,
+                id="zero-failures-online-returns-online",
+            ),
+            pytest.param(
+                0,
+                False,
+                StreamStatus.OFFLINE,
+                id="zero-failures-offline-returns-offline",
+            ),
+            pytest.param(
+                UNKNOWN_STATUS_THRESHOLD,
+                True,
+                StreamStatus.ONLINE,
+                id="at-threshold-online-returns-online",
+            ),
+            pytest.param(
+                UNKNOWN_STATUS_THRESHOLD,
+                False,
+                StreamStatus.OFFLINE,
+                id="at-threshold-offline-returns-offline",
+            ),
+        ],
+    )
+    def test_status(
+        self,
+        failure_counter: int,
+        online: object,
+        expected: StreamStatus,
+    ) -> None:
+        """Return the correct status based on failure counter and online state."""
+        state = StreamState(
+            domain="example.com",
+            failure_counter=failure_counter,
+            online=online is True,
+        )
+        assert state.status is expected
+
+
+class TestFormatStatusSince:
+    """Status timestamp formatting."""
+
+    def test_formats_as_utc_iso_seconds(self) -> None:
+        """Normalize aware datetimes to UTC with second precision."""
+        timestamp = datetime(
+            2026,
+            1,
+            1,
+            12,
+            34,
+            56,
+            123456,
+            tzinfo=timezone(timedelta(hours=-5)),
+        )
+
+        assert format_status_since(timestamp) == "2026-01-01T17:34:56+00:00"
+
+    def test_treats_naive_as_utc(self) -> None:
+        """Format naive datetimes as UTC."""
+        timestamp = datetime.fromisoformat("2026-01-01T12:34:56.123456")
+
+        assert format_status_since(timestamp) == "2026-01-01T12:34:56+00:00"
+
+
+class TestStreamStateObservationFromApiResponse:
+    """StreamStateObservation construction from an API response dictionary."""
+
+    def test_typical_response(self) -> None:
+        """Populate API-derived fields from a complete status response."""
+        observed_at = datetime(2026, 1, 1, 0, 0, 1, tzinfo=UTC)
+        response = {
+            "streamTitle": "My Stream",
+            "online": True,
+        }
+        with time_machine.travel(observed_at, tick=False):
+            observation = StreamStateObservation.from_api_response(
+                response, "example.com"
+            )
+        assert observation.domain == "example.com"
+        assert observation.title == "My Stream"
+        assert observation.online is True
+        assert observation.observed_at == "2026-01-01T00:00:01+00:00"
+
+    def test_missing_required_field_raises(self) -> None:
+        """Reject API responses without required stream state fields."""
+        with pytest.raises(InvalidApiResponseError):
+            StreamStateObservation.from_api_response({}, "bare.example.com")
+
+    def test_offline_response(self) -> None:
+        """Populate offline state from a status response."""
+        observed_at = datetime(2026, 1, 1, 0, 0, 1, tzinfo=UTC)
+        response = {
+            "streamTitle": "Offline Stream",
+            "online": False,
+        }
+        with time_machine.travel(observed_at, tick=False):
+            observation = StreamStateObservation.from_api_response(
+                response, "example.com"
+            )
+        assert observation.online is False
+        assert observation.observed_at == "2026-01-01T00:00:01+00:00"
+
+    def test_title_truncation(self) -> None:
+        """Truncate the stream title to _MAX_STREAM_TITLE_LENGTH."""
+        observed_at = datetime(2026, 1, 1, 0, 0, 1, tzinfo=UTC)
+        long_title = "A" * (_MAX_STREAM_TITLE_LENGTH + 50)
+        response = {
+            "streamTitle": long_title,
+            "online": True,
+        }
+        with time_machine.travel(observed_at, tick=False):
+            observation = StreamStateObservation.from_api_response(
+                response, "example.com"
+            )
+        assert len(observation.title) == _MAX_STREAM_TITLE_LENGTH
+        assert observation.title == "A" * _MAX_STREAM_TITLE_LENGTH
+
+    @pytest.mark.parametrize(
+        ("field", "value"),
+        [
+            pytest.param("streamTitle", 123, id="title-not-string"),
+            pytest.param("online", "true", id="online-not-bool"),
+        ],
+    )
+    def test_invalid_field_type_raises(self, field: str, value: object) -> None:
+        """Reject stream state responses with malformed field types."""
+        response: dict[str, object] = {
+            "streamTitle": "My Stream",
+            "online": True,
+        }
+        response[field] = value
+
+        with pytest.raises(InvalidApiResponseError):
+            StreamStateObservation.from_api_response(response, "example.com")
+
+
+class TestStreamStateFromDbRow:
+    """StreamState construction from a database row dictionary."""
+
+    def test_typical_row(self) -> None:
+        """Populate all fields from a complete database row."""
+        row = {
+            "domain": "example.com",
+            "name": "Test Instance",
+            "title": "Live Now",
+            "online": True,
+            "status_since": "2026-01-01T00:00:00+00:00",
+            "failure_counter": 3,
+        }
+        state = StreamState.from_db_row(row)
+        assert state.domain == "example.com"
+        assert state.name == "Test Instance"
+        assert state.title == "Live Now"
+        assert state.online is True
+        assert state.status_since == "2026-01-01T00:00:00+00:00"
+        assert state.failure_counter == 3
+
+    def test_row_with_none_optional_fields(self) -> None:
+        """Accept None for optional fields in a database row."""
+        row = {
+            "domain": "example.com",
+            "name": None,
+            "title": None,
+            "online": False,
+            "status_since": None,
+            "failure_counter": 0,
+        }
+        state = StreamState.from_db_row(row)
+        assert state.domain == "example.com"
+        assert state.name is None
+        assert state.title is None
+        assert state.online is False
+        assert state.status_since is None
+        assert state.failure_counter == 0
+
+
+class TestStreamConfigObservationFromApiResponse:
+    """StreamConfigObservation construction from an API response dictionary."""
+
+    def test_typical_response(self) -> None:
+        """Populate name and tags from a complete API response."""
+        response = {"name": "My Instance", "tags": ["gaming", "music"]}
+        observed_at = datetime(2026, 1, 1, 0, 0, 1, tzinfo=UTC)
+        with time_machine.travel(observed_at, tick=False):
+            config = StreamConfigObservation.from_api_response(response)
+        assert config.name == "My Instance"
+        assert config.tags == ("gaming", "music")
+        assert config.observed_at == "2026-01-01T00:00:01+00:00"
+
+    def test_missing_keys_defaults(self) -> None:
+        """Use defaults when name and tags keys are missing."""
+        config = StreamConfigObservation.from_api_response({})
+        assert config.name == ""
+        assert config.tags == ()
+
+    def test_name_truncation(self) -> None:
+        """Truncate the instance name to _MAX_INSTANCE_TITLE_LENGTH."""
+        long_name = "B" * (_MAX_INSTANCE_TITLE_LENGTH + 50)
+        response = {"name": long_name, "tags": []}
+        config = StreamConfigObservation.from_api_response(response)
+        assert len(config.name) == _MAX_INSTANCE_TITLE_LENGTH
+        assert config.name == "B" * _MAX_INSTANCE_TITLE_LENGTH
+
+    def test_tag_truncation(self) -> None:
+        """Truncate each tag to _MAX_TAG_LENGTH."""
+        long_tag = "C" * (_MAX_TAG_LENGTH + 10)
+        response = {"name": "", "tags": [long_tag, "short"]}
+        config = StreamConfigObservation.from_api_response(response)
+        assert len(config.tags[0]) == _MAX_TAG_LENGTH
+        assert config.tags[0] == "C" * _MAX_TAG_LENGTH
+        assert config.tags[1] == "short"
+
+    @pytest.mark.parametrize(
+        ("field", "value"),
+        [
+            pytest.param("name", None, id="name-not-string"),
+            pytest.param("tags", "gaming", id="tags-not-list"),
+            pytest.param("tags", ["gaming", 123], id="tag-not-string"),
+        ],
+    )
+    def test_invalid_field_type_raises(self, field: str, value: object) -> None:
+        """Reject stream config responses with malformed field types."""
+        response: dict[str, object] = {"name": "My Instance", "tags": ["gaming"]}
+        response[field] = value
+
+        with pytest.raises(InvalidApiResponseError):
+            StreamConfigObservation.from_api_response(response)
+
+
+class TestValueTypeImmutability:
+    """Dataclass value containers are immutable snapshots."""
+
+    def test_stream_state_is_immutable(self) -> None:
+        """StreamState cannot be mutated in place."""
+        state = StreamState(domain="stream.example")
+        with pytest.raises(FrozenInstanceError):
+            state.title = "Changed"  # type: ignore[misc]
+
+    def test_stream_observation_is_immutable(self) -> None:
+        """StreamStateObservation cannot be mutated in place."""
+        observation = StreamStateObservation(
+            domain="stream.example",
+        )
+        with pytest.raises(FrozenInstanceError):
+            observation.title = "Changed"  # type: ignore[misc]
+
+    def test_stream_config_is_immutable(self) -> None:
+        """StreamConfigObservation cannot be mutated in place."""
+        config = StreamConfigObservation(name="Stream")
+        with pytest.raises(FrozenInstanceError):
+            config.name = "Changed"  # type: ignore[misc]
+
+    def test_stream_config_tags_are_immutable(self) -> None:
+        """StreamConfigObservation tags are stored in an immutable tuple."""
+        config = StreamConfigObservation(name="Stream", tags=("gaming",))
+        assert config.tags == ("gaming",)
+
+    def test_update_result_is_immutable(self) -> None:
+        """UpdateResult cannot be mutated in place."""
+        result = UpdateResult(total_streams=1, successful_checks=1, failed_checks=0)
+        with pytest.raises(FrozenInstanceError):
+            result.failed_checks = 1  # type: ignore[misc]
+
+
+class TestSubscriptionTypes:
+    """Subscription display containers and domain error hierarchy."""
+
+    @pytest.mark.parametrize(
+        "error_cls",
+        [
+            pytest.param(InvalidOwncastInstanceError, id="invalid-instance"),
+            pytest.param(AlreadySubscribedError, id="already-subscribed"),
+            pytest.param(NotSubscribedError, id="not-subscribed"),
+        ],
+    )
+    def test_errors_subclass_subscription_error(
+        self, error_cls: type[Exception]
+    ) -> None:
+        """Every subscription domain error subclasses SubscriptionError."""
+        assert issubclass(error_cls, SubscriptionError)
+
+    @pytest.mark.parametrize(
+        "error",
+        [
+            pytest.param(
+                InvalidOwncastInstanceError("bad.example"),
+                id="invalid-instance",
+            ),
+            pytest.param(
+                AlreadySubscribedError("dupe.example"),
+                id="already-subscribed",
+            ),
+            pytest.param(
+                NotSubscribedError("missing.example"),
+                id="not-subscribed",
+            ),
+        ],
+    )
+    def test_errors_store_domain(self, error: SubscriptionError) -> None:
+        """Subscription domain errors expose the stream domain that failed."""
+        assert error.domain in str(error)
+
+    def test_room_subscription_is_immutable(self) -> None:
+        """RoomSubscription is an immutable stream display snapshot."""
+        state = StreamState(domain="stream.example")
+        subscription = RoomSubscription(domain="stream.example", stream_state=state)
+        with pytest.raises(FrozenInstanceError):
+            subscription.domain = "other.example"  # type: ignore[misc]

tests/test_utils.py

@@ -1,197 +0,0 @@
-# Copyright 2026 Logan Fick
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""Tests for utility functions and constants."""
-
-import pytest
-
-from owncastsentry.utils import (
-    domainify,
-    escape_markdown,
-    sanitize_for_markdown,
-    sanitize_for_plain_text,
-    should_query_stream,
-    truncate,
-    user_agent,
-)
-
-
-class TestUserAgent:
-    """User-Agent header construction."""
-
-    @pytest.mark.parametrize(
-        ("version", "expected"),
-        [
-            pytest.param(
-                "1.2.3",
-                "OwncastSentry/1.2.3 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
-                id="semver",
-            ),
-            pytest.param(
-                "0.0.0",
-                "OwncastSentry/0.0.0 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
-                id="zeroed",
-            ),
-            pytest.param(
-                "1.1.1.dev10+gf0146d061.d20260313",
-                "OwncastSentry/1.1.1.dev10+gf0146d061.d20260313 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)",
-                id="dev-version",
-            ),
-        ],
-    )
-    def test_user_agent(self, version: str, expected: str) -> None:
-        """Build a correctly formatted User-Agent header."""
-        assert user_agent(version) == expected
-
-
-class TestShouldQueryStream:
-    """Progressive backoff logic for stream polling."""
-
-    @pytest.mark.parametrize(
-        ("counter", "expected"),
-        [
-            pytest.param(0, True, id="counter-0-always-query"),
-            pytest.param(1, True, id="counter-1-always-query"),
-            pytest.param(4, True, id="counter-4-always-query"),
-            pytest.param(5, False, id="counter-5-skip-odd"),
-            pytest.param(6, True, id="counter-6-query-even"),
-            pytest.param(9, False, id="counter-9-skip-odd"),
-            pytest.param(10, False, id="counter-10-skip-not-mod-3"),
-            pytest.param(12, True, id="counter-12-query-mod-3"),
-            pytest.param(14, False, id="counter-14-skip-not-mod-3"),
-            pytest.param(15, True, id="counter-15-query-mod-5"),
-            pytest.param(16, False, id="counter-16-skip-not-mod-5"),
-            pytest.param(20, True, id="counter-20-query-mod-5"),
-            pytest.param(29, False, id="counter-29-skip-not-mod-5"),
-            pytest.param(30, True, id="counter-30-query-mod-15"),
-            pytest.param(31, False, id="counter-31-skip-not-mod-15"),
-            pytest.param(45, True, id="counter-45-query-mod-15"),
-            pytest.param(100, False, id="counter-100-skip-not-mod-15"),
-            pytest.param(105, True, id="counter-105-query-mod-15"),
-        ],
-    )
-    def test_backoff_tiers(self, counter: int, expected: bool) -> None:
-        """Return the expected query decision for each backoff tier."""
-        assert should_query_stream(counter) == expected
-
-
-class TestDomainify:
-    """Domain extraction and sanitization from user input."""
-
-    @pytest.mark.parametrize(
-        ("input_url", "expected"),
-        [
-            pytest.param("example.com", "example.com", id="bare-domain"),
-            pytest.param("https://example.com", "example.com", id="https-url"),
-            pytest.param("http://example.com", "example.com", id="http-url"),
-            pytest.param("https://example.com:8080", "example.com", id="url-with-port"),
-            pytest.param(
-                "https://example.com/path/to/page",
-                "example.com",
-                id="url-with-path",
-            ),
-            pytest.param(
-                "user@stream.logal.dev",
-                "stream.logal.dev",
-                id="email-style",
-            ),
-            pytest.param("EXAMPLE.COM", "example.com", id="uppercase"),
-            pytest.param("exam!ple.com", "example.com", id="special-chars-stripped"),
-            pytest.param(".example.com.", "example.com", id="leading-trailing-dots"),
-            pytest.param("-example.com-", "example.com", id="leading-trailing-hyphens"),
-            pytest.param(
-                "sub.domain.example.com",
-                "sub.domain.example.com",
-                id="subdomain",
-            ),
-        ],
-    )
-    def test_extracts_domain(self, input_url: str, expected: str) -> None:
-        """Extract and sanitize the domain from various input formats."""
-        assert domainify(input_url) == expected
-
-
-class TestTruncate:
-    """Text truncation to a maximum length."""
-
-    @pytest.mark.parametrize(
-        ("text", "max_length", "expected"),
-        [
-            pytest.param("hello", 10, "hello", id="under-limit"),
-            pytest.param("hello", 5, "hello", id="exact-limit"),
-            pytest.param("hello world", 5, "hello", id="over-limit"),
-            pytest.param("", 5, "", id="empty-string"),
-        ],
-    )
-    def test_truncates(self, text: str, max_length: int, expected: str) -> None:
-        """Truncate text that exceeds the maximum length."""
-        assert truncate(text, max_length) == expected
-
-
-class TestEscapeMarkdown:
-    """Markdown special character escaping."""
-
-    @pytest.mark.parametrize(
-        ("input_text", "expected"),
-        [
-            pytest.param("hello", "hello", id="plain-text-unchanged"),
-            pytest.param("*bold*", "\\*bold\\*", id="asterisks"),
-            pytest.param("_italic_", "\\_italic\\_", id="underscores"),
-            pytest.param("[link](url)", "\\[link\\]\\(url\\)", id="link-syntax"),
-            pytest.param("`code`", "\\`code\\`", id="backticks"),
-            pytest.param("# heading", "\\# heading", id="heading"),
-            pytest.param("> quote", "\\> quote", id="blockquote"),
-            pytest.param("<html>", "\\<html\\>", id="angle-brackets"),
-            pytest.param("a & b", "a \\& b", id="ampersand"),
-            pytest.param("a\\b", "a\\\\b", id="backslash"),
-            pytest.param("", "", id="empty-string"),
-        ],
-    )
-    def test_escapes_special_chars(self, input_text: str, expected: str) -> None:
-        """Escape the given Markdown special character."""
-        assert escape_markdown(input_text) == expected
-
-
-class TestSanitizeForPlainText:
-    """Plain text sanitization for notifications."""
-
-    @pytest.mark.parametrize(
-        ("input_text", "expected"),
-        [
-            pytest.param("hello world", "hello world", id="plain-text"),
-            pytest.param("line1\nline2", "line1 line2", id="newline-removed"),
-            pytest.param("line1\rline2", "line1 line2", id="carriage-return"),
-            pytest.param("line1\r\nline2", "line1 line2", id="crlf-removed"),
-            pytest.param(
-                "too   many   spaces", "too many spaces", id="spaces-collapsed"
-            ),
-            pytest.param("", "", id="empty-string"),
-        ],
-    )
-    def test_sanitizes(self, input_text: str, expected: str) -> None:
-        """Sanitize the text for safe plain-text rendering."""
-        assert sanitize_for_plain_text(input_text) == expected
-
-
-class TestSanitizeForMarkdown:
-    """Markdown sanitization combining newline removal and escaping."""
-
-    def test_removes_newlines_and_escapes(self) -> None:
-        """Remove newlines and escape Markdown special characters."""
-        result = sanitize_for_markdown("*bold*\nnew line")
-        assert result == "\\*bold\\* new line"
-
-    def test_empty_string(self) -> None:
-        """Return empty string unchanged."""
-        assert sanitize_for_markdown("") == ""

uv.lock

@@ -112,6 +112,44 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/da/42/e921fccf5015463e32a3cf6ee7f980a6ed0f395ceeaa45060b61d86486c2/anyio-4.13.0-py3-none-any.whl", hash = "sha256:08b310f9e24a9594186fd75b4f73f4a4152069e3853f1ed8bfbf58369f4ad708", size = 114353, upload-time = "2026-03-24T12:59:08.246Z" },
 ]
 
+[[package]]
+name = "ast-serialize"
+version = "0.4.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/e2/1f/50f241d4e01fe75f4bba6a209edd4047c4b26acf70992ff885fd161f79cb/ast_serialize-0.4.0.tar.gz", hash = "sha256:74e4e634ab82d1466acf0be27043178570b98ebeaa3165f9240a6fad4c286471", size = 60687, upload-time = "2026-05-14T22:44:38.251Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/b0/85/232631c59b5ca7152c08f026e9a46f47d852298acff74edd04a1fc1d0005/ast_serialize-0.4.0-cp314-cp314t-macosx_10_12_x86_64.whl", hash = "sha256:a6f26937ce0293aafbece0e39019e020369a5a70486ff4088227f0cc888844a9", size = 1182685, upload-time = "2026-05-14T22:43:40.205Z" },
+    { url = "https://files.pythonhosted.org/packages/5d/5e/4838d4d3ddc4425555601467d4e2a565e4340899e45feee4e32c80fbc911/ast_serialize-0.4.0-cp314-cp314t-macosx_11_0_arm64.whl", hash = "sha256:074032142777e3e6091977dc3c5146a8ca58ae6825b7f64e9a0b604153ddabd8", size = 1173113, upload-time = "2026-05-14T22:43:41.937Z" },
+    { url = "https://files.pythonhosted.org/packages/22/fc/d622b19fc1c79a62028ec17f4ad4323177af25b174d32b07c84d61ef9d47/ast_serialize-0.4.0-cp314-cp314t-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:404f3462b4532e13a70b8849bba241dbd82e30043ff58d98c7e762fd925b116a", size = 1234117, upload-time = "2026-05-14T22:43:43.977Z" },
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