Replaced health checker with Prometheus metrics service.

- Replaced legacy typing (Optional, List, Type, Union, Tuple) with PEP 604/585 equivalents.
- Added pyproject.toml with configurations for hatch-vcs, mypy, ruff, and codespell.
- Added CI workflows for formatting, linting, type checking, and spelling.
- Added CD workflow for building and uploading plugin artifacts on push to master and version tags.
- Added dependency auditing workflow with pip-audit.
- Added comprehensive docstrings and inline comments across all modules.
- Fixed User-Agent header using hardcoded version instead of actual plugin version.
- Fixed grammar and terminology in log messages and comments.
- Removed unreachable error handling branch in unsubscribe command.

.gitea/workflows/audit.yml

@@ -0,0 +1,29 @@
+name: Audit
+
+on:
+  schedule:
+    - cron: "0 0 * * 1"
+  push:
+    paths: [uv.lock]
+  pull_request:
+    paths: [uv.lock]
+
+jobs:
+  audit:
+    name: Dependencies
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Audit dependencies with pip-audit
+        run: uv run pip-audit --skip-editable

.gitea/workflows/build.yml

@@ -1,20 +0,0 @@
-name: Build Maubot Plugin Artifact
-on: [push]
-
-jobs:
-  build:
-    name: Build
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Build artifact
-        run: zip -v -9 OwncastSentry-v${{env.GITHUB_SHA}}.mbp LICENSE.txt maubot.yaml owncastsentry.py
-
-      - name: Upload artifact
-        uses: actions/upload-artifact@v3
-        with:
-          name: Maubot Plugin
-          path: OwncastSentry-v${{env.GITHUB_SHA}}.mbp

.gitea/workflows/cd.yml

@@ -0,0 +1,52 @@
+name: CD
+
+on:
+  push:
+    branches: [master]
+    tags: ["v*"]
+
+jobs:
+  build:
+    name: Build
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          fetch-depth: 0
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Compute version
+        id: version
+        run: |
+          version=$(uv run hatch version)
+          echo "version=$version"
+          echo "version=$version" >> "$GITEA_OUTPUT"
+
+      - name: Write version into maubot.yaml
+        run: |
+          sed -i "s/^version: .*/version: ${{ steps.version.outputs.version }}/" maubot.yaml
+          grep "^version:" maubot.yaml
+
+      - name: Build plugin
+        run: 7z a -tzip -mx=9 -xr!__pycache__ owncastsentry-v${{ steps.version.outputs.version }}.mbp owncastsentry/ maubot.yaml base-config.yaml LICENSE.txt
+
+      - name: Print artifact checksums
+        run: |
+          echo "MD5: $(md5sum owncastsentry-v${{ steps.version.outputs.version }}.mbp)"
+          echo "SHA1: $(sha1sum owncastsentry-v${{ steps.version.outputs.version }}.mbp)"
+          echo "SHA256: $(sha256sum owncastsentry-v${{ steps.version.outputs.version }}.mbp)"
+
+      - name: Upload plugin artifact
+        uses: https://github.com/christopherhx/gitea-upload-artifact@62ac910c5d3dfa85c7cb2df15afe2e342b2407c2 # v4
+        with:
+          name: owncastsentry-v${{ steps.version.outputs.version }}
+          path: owncastsentry-v${{ steps.version.outputs.version }}.mbp

.gitea/workflows/ci.yml

@@ -0,0 +1,104 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  formatting:
+    name: Formatting
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Check formatting with Ruff
+        run: uv run ruff format --check --diff .
+
+  linting:
+    name: Linting
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Check linting with Ruff
+        run: uv run ruff check .
+
+  tests:
+    name: Tests
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Run unit tests with Pytest
+        run: uv run pytest -v --cov --cov-report=
+
+      - name: Report code coverage
+        run: uv run coverage report
+
+  type-checking:
+    name: Type Checking
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Check types with Mypy
+        run: uv run mypy .
+
+  spelling:
+    name: Spelling
+    runs-on: logaldeveloper-archlinux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache uv packages
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: ~/.cache/uv
+          key: uv-${{ hashFiles('uv.lock') }}
+
+      - name: Install dependencies
+        run: uv sync --frozen
+
+      - name: Check spelling with codespell
+        run: uv run codespell

.gitea/workflows/lint.yml

@@ -1,19 +0,0 @@
-name: Lint Source Code
-on: [push]
-
-jobs:
-  lint:
-    name: Lint
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Setup Python environment
-        uses: actions/setup-python@v5
-        with:
-          python-version: 3.13
-
-      - name: Run linter
-        uses: psf/black@stable

.gitignore

@@ -0,0 +1,6 @@
+__pycache__/
+*.py[cod]
+*$py.class
+.venv/
+owncastsentry/_version.py
+.coverage

LICENSE.txt

@@ -1,6 +1,7 @@
+
                                  Apache License
                            Version 2.0, January 2004
-                        https://www.apache.org/licenses/
+                        http://www.apache.org/licenses/
 
    TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
@@ -174,3 +175,28 @@
       of your accepting any such warranty or additional liability.
 
    END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   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.

base-config.yaml

@@ -0,0 +1,4 @@
+# Prometheus metrics endpoint.
+# When enabled, a /metrics endpoint is exposed via the maubot webapp.
+# Disabled by default.
+metrics_enabled: false

maubot.yaml

@@ -1,9 +1,15 @@
 maubot: 0.1.0
 id: dev.logal.owncastsentry
-version: 1.0.2
+version: 1.1.0
 license: Apache-2.0
 modules:
   - owncastsentry
 main_class: OwncastSentry
 database: true
 database_type: asyncpg
+config: true
+webapp: true
+dependencies:
+  - prometheus_client>=0.24.1
+extra_files:
+  - base-config.yaml

owncastsentry.py

@@ -1,517 +0,0 @@
-# Copyright 2025 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: https://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.
-
-import sqlite3
-import aiohttp
-import json
-import asyncio
-
-from maubot import Plugin, MessageEvent
-from maubot.handlers import command
-from mautrix.types import TextMessageEventContent, MessageType
-from mautrix.util.async_db import UpgradeTable, Connection
-
-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"
-
-# User agent to send with all HTTP requests.
-USER_AGENT = (
-    "OwncastSentry/1.0.2 (bot; +https://git.logal.dev/LogalDeveloper/OwncastSentry)"
-)
-
-
-# ===== DATABASE MIGRATIONS =====
-upgrade_table = UpgradeTable()
-
-
-@upgrade_table.register(description="Initial revision")
-async def upgrade_v1(conn: Connection) -> None:
-    """
-    Runs migrations to upgrade database schema to verison 1 format.
-    Version 1 is the initial format of the database.
-
-    :param conn: A connection to run the v1 database migration on.
-    :return: Nothing.
-    """
-    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")
-        )"""
-    )
-
-
-# ===== MAIN BOT CLASS =====
-class OwncastSentry(Plugin):
-    # Helper variables for setting up a special HTTP ClientSession for monitoring streams.
-    headers = {
-        "User-Agent": USER_AGENT
-    }  # Override User Agent to special static value to identify to servers our purpose.
-    cookie_jar = aiohttp.DummyCookieJar()  # Ignore cookies.
-    baseconnctor = aiohttp.TCPConnector(
-        use_dns_cache=False, limit=1000, limit_per_host=1, keepalive_timeout=120
-    )  # Set up timeouts to keep one long-lived connection open per monitored stream.
-    timeouts = aiohttp.ClientTimeout(
-        sock_connect=5, sock_read=5
-    )  # Tighten up timeouts for faster responses to users in case of broken servers.
-
-    # Final HTTP ClientSession for all requests to Owncast instances.
-    session = aiohttp.ClientSession(
-        headers=headers, cookie_jar=cookie_jar, timeout=timeouts, connector=baseconnctor
-    )
-
-    @classmethod
-    def get_db_upgrade_table(cls) -> UpgradeTable | None:
-        """
-        Helper method for telling Maubot about our database migrations.
-
-        :return: An UpgradeTable with our registered migrations.
-        """
-        return upgrade_table
-
-    async def start(self) -> None:
-        """
-        Method called by Maubot upon startup of the instance.
-        Registers a recurring task every minute to update the state of all subscribed streams.
-
-        :return: Nothing.
-        """
-        self.sched.run_periodically(60, self.update_all_stream_states)
-
-    @command.new(help="Subscribes to a new Owncast stream.")
-    @command.argument("url")
-    async def subscribe(self, evt: MessageEvent, url: str) -> None:
-        """
-        "!subscribe" command handler for users to subscribe a room to a given stream's notifications.
-
-        :param evt: MessageEvent of the message calling the command.
-        :param url: A string containing the user supplied URL to a stream to try and subscribe to.
-        :return: Nothing.
-        """
-
-        # Convert the user input to only a domain.
-        stream_domain = self.domainify(url)
-
-        # How many subscriptions already exist for this domain?
-        query = "SELECT COUNT(*) FROM subscriptions WHERE stream_domain=$1"
-        async with self.database.acquire() as connection:
-            result = await connection.fetchrow(query, stream_domain)
-
-        if result[0] == 0:
-            # There are 0 subscriptions, we need to validate this domain is an Owncast stream.
-            # Attempt to fetch the stream state from this domain.
-            stream_state = await self.get_stream_state(stream_domain)
-            if len(stream_state) == 0:
-                # The stream state fetch returned nothing. Probably not an Owncast stream.
-                await evt.reply(
-                    "The URL you supplied does not appear to be a valid Owncast instance. You may have specified an invalid domain, or the instance is offline."
-                )
-                return
-
-        # Try to add a new subscription for the requested stream domain in the room the command was executed in.
-        try:
-            query = "INSERT INTO subscriptions (stream_domain, room_id) VALUES ($1, $2)"
-            async with self.database.acquire() as connection:
-                await connection.execute(query, stream_domain, evt.room_id)
-        except sqlite3.IntegrityError as exception:
-            # Something weird happened... Was it due to attempting to insert a duplicate row?
-            if "UNIQUE constraint failed" in exception.args[0]:
-                # Yes, this is an expected condition. Tell the user the room is already subscribed and give up.
-                await evt.reply(
-                    "This room is already subscribed to notifications for "
-                    + stream_domain
-                    + "."
-                )
-                return
-            else:
-                # Nope... Something unexpected happened. Give up.
-                self.log.error(
-                    f"[{stream_domain}] An error occurred while attempting to add subscription in room {evt.room_id}: {e}"
-                )
-                raise exception
-
-        # The subscription was successfully added! Try to add a placeholder row for the stream's state in the streams table.
-        try:
-            query = "INSERT INTO streams (domain) VALUES ($1)"
-
-            async with self.database.acquire() as connection:
-                await connection.execute(query, stream_domain)
-
-            # The insert was successful, so this is the first time we're seeing this stream. Log it.
-            self.log.info(f"[{stream_domain}] Discovered new stream!")
-        except sqlite3.IntegrityError as exception:
-            # Attempts to add rows for streams already known is an expected condition. What is anything except that?
-            if "UNIQUE constraint failed" not in exception.args[0]:
-                # Something unexpected happened. Give up.
-                self.log.error(
-                    f"[{stream_domain}] An error occurred while attempting to add stream information after adding subscription: {e}"
-                )
-                raise exception
-
-        # All went well! We added a new subscription and (at least tried) to add a row for the stream state. Tell the user.
-        self.log.info(f"[{stream_domain}] Subscription added for room {evt.room_id}.")
-        await evt.reply(
-            "Subscription added! This room will receive notifications when "
-            + stream_domain
-            + " goes live."
-        )
-
-    @command.new(help="Unsubscribes from an Owncast stream.")
-    @command.argument("url")
-    async def unsubscribe(self, evt: MessageEvent, url: str) -> None:
-        """
-        "!unsubscribe" command handler for users to unsubscribe a room from a given stream's notifications.
-
-        :param evt: MessageEvent of the message calling the command.
-        :param url: A string containing the user supplied URL to a stream to try and unsubscribe from.
-        :return: Nothing.
-        """
-        # Convert the user input to only a domain.
-        stream_domain = self.domainify(url)
-
-        # Attempt to delete the requested subscription from the database.
-        query = "DELETE FROM subscriptions WHERE stream_domain=$1 AND room_id=$2"
-        async with self.database.acquire() as connection:
-            result = await connection.execute(query, stream_domain, evt.room_id)
-
-        # Did it work?
-        if result.rowcount == 1:
-            # Yes, one row was deleted. Tell the user.
-            self.log.info(
-                f"[{stream_domain}] Subscription removed for room {evt.room_id}."
-            )
-            await evt.reply(
-                "Subscription removed! This room will no longer receive notifications for "
-                + stream_domain
-                + "."
-            )
-        elif result.rowcount == 0:
-            # No, nothing changed. Tell the user.
-            await evt.reply(
-                "This room is already not subscribed to notifications for "
-                + stream_domain
-                + "."
-            )
-        else:
-            # Somehow more than 1 (or even less than 0 ???) rows were changed... Log it!
-            self.log.error(
-                "Encountered strange situation! Expected 0 or 1 rows on DELETE query for removing subscription; got "
-                + result.rowcount
-                + " instead. Something very bad may have happened!!!!"
-            )
-
-    async def update_all_stream_states(self) -> None:
-        """
-        Checks the status of all streams with active subscriptions.
-        Updates for all streams are performed asynchronously, with the method returning when the slowest update completes.
-
-        :return: Nothing.
-        """
-        self.log.debug("Updating all stream states...")
-
-        # Make a list of all stream domains with an active subscription.
-        query = "SELECT DISTINCT stream_domain FROM subscriptions"
-        async with self.database.acquire() as connection:
-            results = await connection.fetch(query)
-
-        # Build a list of async tasks which update the state for each stream domain fetched.
-        tasks = []
-        for row in results:
-            domain = row["stream_domain"]
-
-            tasks.append(asyncio.create_task(self.update_stream_state(domain)))
-
-        # Run the tasks in parallel.
-        await asyncio.gather(*tasks)
-        self.log.debug("Update complete.")
-
-    async def update_stream_state(self, domain: str) -> None:
-        """
-        Updates the state of a given stream domain and sends notifications to subscribed Matrix rooms if it goes live.
-
-        :param domain: The domain of the stream to update.
-        :return: Nothing.
-        """
-
-        # A flag indicating whether to send a notification.
-        # Used for the first state update of a brand-new stream to avoid sending notifications if its already live.
-        send_notifications = True
-
-        # Fetch the latest stream state from the server.
-        new_state = await self.get_stream_state(domain)
-
-        # Skip the update if the fetch failed for any reason.
-        if new_state == {}:
-            return
-
-        # Fetch the last known stream state from the database.
-        query = "SELECT last_connect_time, last_disconnect_time FROM streams WHERE domain=$1"
-        async with self.database.acquire() as connection:
-            old_state = await connection.fetchrow(query, domain)
-
-        # Does the last known stream state not have a value for the last connect and disconnect time?
-        if (
-            old_state["last_connect_time"] is None
-            and old_state["last_disconnect_time"] is None
-        ):
-            # Yes, this is the first update. Don't send any notifications.
-            send_notifications = False
-
-        # Does the latest stream state have a last connect time and the old state not have one?
-        if (
-            new_state["lastConnectTime"] is not None
-            and old_state["last_connect_time"] is None
-        ):
-            # Yes! This stream is now live. Send notifications and log it, if allowed.
-            if send_notifications:
-                self.log.info(
-                    f"[{domain}] Stream is now live! Notifying subscribed rooms..."
-                )
-                await self.notify_rooms_of_stream_online(
-                    domain, new_state["streamTitle"]
-                )
-            else:
-                self.log.info(
-                    f"[{domain}] Stream is live, but performed first update. WIll not notify subscribed rooms."
-                )
-
-        # Does the latest stream state no longer have a last connect time but the old state does?
-        elif (
-            new_state["lastConnectTime"] is None
-            and old_state["last_connect_time"] is not None
-        ):
-            # Yep. This stream is now offline. Log it.
-            if send_notifications:
-                self.log.info(f"[{domain}] Stream is now offline.")
-            else:
-                self.log.info(f"[{domain}] Stream is offline.")
-
-        # Update the database with the current stream state.
-        # TODO: Only update the database if a change actually occurred. This is probably generating useless writes.
-        update_query = "UPDATE streams SET name=$1, last_connect_time=$2, last_disconnect_time=$3 WHERE domain=$4"
-        async with self.database.acquire() as connection:
-            await connection.execute(
-                update_query,
-                new_state["streamTitle"],
-                new_state["lastConnectTime"],
-                new_state["lastDisconnectTime"],
-                domain,
-            )
-
-        # All done.
-        self.log.debug(f"[{domain}] State update completed.")
-
-    async def notify_rooms_of_stream_online(self, domain: str, title: str) -> None:
-        """
-        Sends notifications to rooms with subscriptions to the provided stream domain.
-
-        :param domain: The domain of the stream to send notifications for.
-        :param title: The title of the stream to include in the message.
-        :return: Nothing.
-        """
-        # Get a list of room IDs with active subscriptions to the stream domain.
-        query = "SELECT room_id FROM subscriptions WHERE stream_domain=$1"
-        async with self.database.acquire() as connection:
-            results = await connection.fetch(query, domain)
-
-        # Set up some counters for a high level statistics.
-        successful_notifications = 0
-        failed_notifications = 0
-
-        stream_config = await self.get_stream_config(domain)
-
-        # Build the message body text.
-        if "name" in stream_config:
-            body_text = "🎥 " + stream_config["name"] + " is now live!"
-        else:
-            # Turns out it is possible to set an empty name for an Owncast stream if you know how.
-            # We'll account for that... Just in case.
-            body_text = "🎥 " + domain + " is now live!"
-
-        # Streams can have no title. If there is none, don't even mention it.
-        if title != "":
-            body_text += "\nStream Title: " + title
-
-        body_text += "\n\nTo tune in, visit: https://" + domain + "/\n\n"
-
-        if "tags" in stream_config and len(stream_config["tags"]) > 0:
-            body_text += "\n\n"
-            body_text += " ".join("#" + tag for tag in stream_config["tags"])
-
-        # Iterate over the subscribed rooms and try to send a message to each.
-        # TODO: This should probably be made async.
-        for rows in results:
-            room_id = rows["room_id"]
-            try:
-                # Try and send a message.
-                content = TextMessageEventContent(
-                    msgtype=MessageType.TEXT, body=body_text
-                )
-                await self.client.send_message(room_id, content)
-
-                # It worked! Increment the counter.
-                successful_notifications += 1
-            except Exception as exception:
-                # Something didn't work. Log it and move on to the next one.
-                self.log.warning(
-                    f"[{domain}] Failed to send notification message to room [{room_id}]: {exception}"
-                )
-                failed_notifications += 1
-
-        # All done!
-        self.log.info(
-            f"[{domain}] Completed sending notifications! {successful_notifications} succeeded, {failed_notifications} failed."
-        )
-
-    # ========== HELPER METHODS ==========
-    async def get_stream_state(self, domain):
-        """
-        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 dictionary containing the lastConnectTime, lastDisconnectTime, streamTitle, and online values if available. An empty dictionary if an error occurred.
-        """
-        self.log.debug(f"[{domain}] Fetching current stream state...")
-        # Build a URL to the status API in Owncast. (https://owncast.online/api/latest/#tag/Internal/operation/GetStatus)
-        # Only use HTTPS, even if the user specified something else.
-        status_url = "https://" + domain + OWNCAST_STATUS_PATH
-
-        # Make a request to the endpoint.
-        try:
-            response = await self.session.request(
-                "GET", status_url, allow_redirects=False
-            )
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Error making GET request to {OWNCAST_STATUS_PATH}: {e}"
-            )
-            return {}
-
-        # Check the response code is success
-        # TODO: Handle 429 rate limiting?
-        if response.status != 200:
-            self.log.warning(
-                f"[{domain}] Response to request on {OWNCAST_STATUS_PATH} was not 200, got {response.status} instead."
-            )
-            return {}
-
-        # Try and interpret the response as JSON.
-        try:
-            new_state = json.loads(await response.read())
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as could not be interpreted as JSON: {e}"
-            )
-            return {}
-
-        # Validate the response to ensure it contains all the basic info needed to function.
-        if "lastConnectTime" not in new_state:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as it does not have last connect time parameter."
-            )
-            return {}
-        elif "lastDisconnectTime" not in new_state:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as it does not have last disconnect time parameter."
-            )
-            return {}
-        elif "streamTitle" not in new_state:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as it does not have stream title parameter."
-            )
-            return {}
-        elif "online" not in new_state:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as it does not have online status parameter."
-            )
-            return {}
-
-        return new_state
-
-    async def get_stream_config(self, domain):
-        """
-        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 dictionary containing the stream's configuration.
-        """
-        self.log.debug(f"[{domain}] Fetching current stream config...")
-        # Build a URL to the config API in Owncast. (https://owncast.online/api/latest/#tag/Internal/operation/GetWebConfig)
-        # Only use HTTPS, even if the user specified something else.
-        status_url = "https://" + domain + OWNCAST_CONFIG_PATH
-
-        # Make a request to the endpoint.
-        try:
-            response = await self.session.request(
-                "GET", status_url, allow_redirects=False
-            )
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Error making GET request to {OWNCAST_STATUS_PATH}: {e}"
-            )
-            return {}
-
-        # Check the response code is success
-        # TODO: Handle 429 rate limiting?
-        if response.status != 200:
-            self.log.warning(
-                f"[{domain}] Response to request on {OWNCAST_STATUS_PATH} was not 200, got {response.status} instead."
-            )
-            return {}
-
-        # Try and interpret the response as JSON.
-        try:
-            config = json.loads(await response.read())
-        except Exception as e:
-            self.log.warning(
-                f"[{domain}] Rejecting response to request on {OWNCAST_STATUS_PATH} as could not be interpreted as JSON: {e}"
-            )
-            return {}
-
-        return config
-
-    def domainify(self, url) -> str:
-        """
-        Take a given URL and convert it to just the domain.
-
-        :param url:
-        :return:
-        """
-        # Take whatever input the user provided and try to turn it into just the domain.
-        # Examples:
-        # "stream.logal.dev" -> "stream.logal.dev"
-        # "https://stream.logal.dev" -> "stream.logal.dev"
-        # "stream.logal.dev/embed/chat/readwrite" -> "stream.logal.dev"
-        # "https://stream.logal.dev/abcdefghijklmno/123456789" -> "stream.logal.dev"
-        # "notify@stream.logal.dev" -> "stream.logal.dev"
-
-        parsed_url = urlparse(url)
-        domain = (parsed_url.netloc or parsed_url.path).lower()
-
-        if "@" in domain:
-            return domain.split("@")[-1]
-
-        return domain

owncastsentry/__init__.py

@@ -0,0 +1,178 @@
+# 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.
+
+"""OwncastSentry maubot plugin."""
+
+from typing import TYPE_CHECKING
+
+from aiohttp import web
+from maubot import MessageEvent, Plugin  # type: ignore[attr-defined]
+from maubot.handlers import command
+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 .stream_monitor import StreamMonitor
+
+if TYPE_CHECKING:
+    from mautrix.util.async_db import Database, UpgradeTable
+    from mautrix.util.config import BaseProxyConfig
+
+
+class OwncastSentry(Plugin):
+    """Main plugin class for OwncastSentry."""
+
+    @classmethod
+    def get_db_upgrade_table(cls) -> UpgradeTable | None:
+        """Return the database upgrade table for Maubot."""
+        return get_upgrade_table()
+
+    @classmethod
+    def get_config_class(cls) -> type[BaseProxyConfig]:
+        """Return the configuration class for Maubot."""
+        return Config
+
+    async def start(self) -> None:
+        """Initialize all services and register recurring tasks.
+
+        Registers a recurring task every minute to update the state of
+        all subscribed streams.
+        """
+        # Load configuration
+        config: Config = self.config  # type: ignore[assignment]
+        config.load_and_update()
+        db: Database = self.database  # type: ignore[assignment]
+
+        # Initialize metrics service and register web endpoint (if enabled)
+        self.metrics_service = MetricsService()
+        self.metrics_service.set_build_info(str(self.loader.meta.version))
+        if config.metrics_enabled and self.webapp is not None:
+            self.webapp.add_route(
+                method="GET", path="/metrics", handler=self._metrics_endpoint
+            )
+
+        # Initialize the Owncast API client
+        self.owncast_client = OwncastClient(
+            self.log, str(self.loader.meta.version), metrics=self.metrics_service
+        )
+        self.metrics_service.register_open_connections_gauge(
+            lambda: self.owncast_client.open_connection_count
+        )
+
+        # Initialize repositories
+        self.stream_repo = StreamRepository(db)
+        self.subscription_repo = SubscriptionRepository(db)
+
+        # Initialize notification service
+        self.notification_service = NotificationService(
+            self.client,
+            self.subscription_repo,
+            self.log,
+            metrics=self.metrics_service,
+        )
+
+        # Initialize stream monitor
+        self.stream_monitor = StreamMonitor(
+            self.owncast_client,
+            self.stream_repo,
+            self.subscription_repo,
+            self.notification_service,
+            self.log,
+            metrics=self.metrics_service,
+        )
+
+        # Initialize command handler
+        self.command_handler = CommandHandler(
+            self.owncast_client,
+            self.stream_repo,
+            self.subscription_repo,
+            self.log,
+        )
+
+        # Schedule periodic stream state updates every 60 seconds
+        self.sched.run_periodically(60, self._update_all_stream_states)
+
+    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
+            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.")
+
+    @command.new(help="Subscribes to a new Owncast stream.")
+    @command.argument("url")
+    async def subscribe(self, evt: MessageEvent, url: str) -> None:
+        """Delegate subscribe command to CommandHandler."""
+        try:
+            await self.command_handler.subscribe(evt, url)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in subscribe command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
+
+    @command.new(help="Unsubscribes from an Owncast stream.")
+    @command.argument("url")
+    async def unsubscribe(self, evt: MessageEvent, url: str) -> None:
+        """Delegate unsubscribe command to CommandHandler."""
+        try:
+            await self.command_handler.unsubscribe(evt, url)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in unsubscribe command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
+
+    @command.new(help="Lists all stream subscriptions in this room.")
+    async def subscriptions(self, evt: MessageEvent) -> None:
+        """Delegate subscriptions command to CommandHandler."""
+        try:
+            await self.command_handler.subscriptions(evt)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in subscriptions command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
+
+    @command.new(help="Lists currently live streams in this room.")
+    async def live(self, evt: MessageEvent) -> None:
+        """Delegate live command to CommandHandler."""
+        try:
+            await self.command_handler.live(evt)
+        except Exception:
+            self.metrics_service.record_error(ErrorSource.COMMAND)
+            self.log.exception("Unhandled exception in live command.")
+            await evt.reply("An unexpected error occurred. Please try again later.")
+
+    async def _metrics_endpoint(self, request: web.Request) -> web.Response:
+        """Serve Prometheus metrics."""
+        accept = request.headers.get("Accept", "")
+        encoder, content_type = choose_encoder(accept)
+        output = encoder(self.metrics_service.registry)
+        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

@@ -0,0 +1,290 @@
+# 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.
+
+"""Command handlers for OwncastSentry bot commands."""
+
+import sqlite3
+from datetime import UTC, datetime
+from typing import TYPE_CHECKING
+
+from .models import StreamStatus
+from .utils import domainify, sanitize_for_markdown
+
+if TYPE_CHECKING:
+    import logging
+
+    from maubot import MessageEvent  # type: ignore[attr-defined]
+
+    from .database import StreamRepository, SubscriptionRepository
+    from .owncast_client import OwncastClient
+
+
+class CommandHandler:
+    """Handles bot commands for managing stream subscriptions."""
+
+    def __init__(
+        self,
+        owncast_client: OwncastClient,
+        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 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.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.
+        """
+        # Convert the user input to only a domain
+        stream_domain = domainify(url)
+
+        # 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 "
+                    "specified an invalid domain, or the "
+                    "instance is offline."
+                )
+                return
+
+        # 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}."
+            )
+            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."
+        )
+
+    async def unsubscribe(self, evt: MessageEvent, url: str) -> None:
+        """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.
+        """
+        # Convert the user input to only a domain
+        stream_domain = domainify(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}."
+            )
+            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
+        subscribed_domains = (
+            await self.subscription_repo.get_subscribed_streams_for_room(evt.room_id)
+        )
+
+        # Check if there are no subscriptions
+        if not subscribed_domains:
+            await evt.reply(
+                "This room is not subscribed to any Owncast "
+                "instances.\n\nTo subscribe to an Owncast "
+                "instance, use `!subscribe <domain>`",
+                markdown=True,
+            )
+            return
+
+        # Build the response message body as Markdown
+        count = len(subscribed_domains)
+        parts = [f"**Subscriptions for this room ({count}):**\n\n"]
+
+        for domain in subscribed_domains:
+            # Get the stream state from the database
+            stream_state = await self.stream_repo.get_by_domain(domain)
+            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)
+
+            # 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)
+                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:
+                    duration = self._format_duration(stream_state.last_connect_time)
+                    parts.append(f"  - Status: Online for {duration}  \n")
+                case StreamStatus.UNKNOWN:
+                    parts.append("  - Status: Unknown (instance unreachable)  \n")
+                case StreamStatus.OFFLINE if stream_state.last_disconnect_time:
+                    duration = self._format_duration(stream_state.last_disconnect_time)
+                    parts.append(f"  - Status: Offline for {duration}  \n")
+                case StreamStatus.OFFLINE:
+                    parts.append("  - Status: Offline  \n")
+
+            # Add stream link (as a sub-bullet)
+            parts.append(f"  - Link: https://{domain}\n\n")
+
+        # Add help text for unsubscribing
+        parts.append(
+            "\nTo unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+        # Send the response as Markdown
+        await evt.reply("".join(parts), markdown=True)
+
+    async def live(self, evt: MessageEvent) -> None:
+        """List currently live streams in the current room.
+
+        :param evt: MessageEvent of the message calling the command.
+        """
+        # Get all stream domains this room is subscribed to
+        subscribed_domains = (
+            await self.subscription_repo.get_subscribed_streams_for_room(evt.room_id)
+        )
+
+        # Check if there are no subscriptions
+        if not subscribed_domains:
+            await evt.reply(
+                "This room is not subscribed to any Owncast "
+                "instances.\n\nTo subscribe to an Owncast "
+                "instance, use `!subscribe <domain>`",
+                markdown=True,
+            )
+            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 "
+                "subscriptions.",
+                markdown=True,
+            )
+            return
+
+        # Build the response message body as Markdown
+        count = len(live_streams)
+        parts = [f"**Live Owncast instances ({count}):**\n\n"]
+
+        for domain, stream_state in live_streams:
+            # Determine stream name (use domain as fallback)
+            stream_name = stream_state.name or domain
+            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)
+            if 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:
+                duration = self._format_duration(stream_state.last_connect_time)
+                parts.append(f"  - Online for {duration}  \n")
+
+            # Add stream link
+            parts.append(f"  - Link: https://{domain}\n\n")
+
+        # Send the response as Markdown
+        await evt.reply("".join(parts).rstrip(), markdown=True)

owncastsentry/config.py

@@ -0,0 +1,33 @@
+# 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.
+
+"""Configuration module for the OwncastSentry plugin."""
+
+from mautrix.util.config import BaseProxyConfig, ConfigUpdateHelper
+
+
+class Config(BaseProxyConfig):
+    """Configuration class for OwncastSentry plugin."""
+
+    def do_update(self, helper: ConfigUpdateHelper) -> None:
+        """Update configuration with user-provided values.
+
+        :param helper: ConfigUpdateHelper for copying values.
+        """
+        helper.copy("metrics_enabled")
+
+    @property
+    def metrics_enabled(self) -> bool:
+        """Return whether the Prometheus metrics endpoint is enabled."""
+        return self["metrics_enabled"]  # type: ignore[no-any-return]

owncastsentry/database.py

@@ -0,0 +1,199 @@
+# 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

@@ -0,0 +1,234 @@
+# 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.
+
+"""Prometheus metrics service for OwncastSentry."""
+
+import time
+from contextlib import contextmanager, suppress
+from enum import StrEnum
+from typing import TYPE_CHECKING
+
+from prometheus_client import CollectorRegistry, Counter, Gauge, Info
+
+from .models import StreamStatus
+
+
+class NotificationType(StrEnum):
+    """Notification type labels for the delivery counter."""
+
+    LIVE = "live"
+    TITLE_CHANGE = "title_change"
+    CLEANUP_WARNING = "cleanup_warning"
+    CLEANUP_DELETION = "cleanup_deletion"
+
+
+class ErrorSource(StrEnum):
+    """Error source labels for the error counter."""
+
+    SCHEDULER_LOOP = "scheduler_loop"
+    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,
+    StreamStatus.OFFLINE: 0.0,
+    StreamStatus.UNKNOWN: -1.0,
+}
+
+
+class _ResponseTimer:
+    """Timer that only records an observation when explicitly marked successful."""
+
+    __slots__ = ("_domain", "_gauge", "_should_observe", "_start")
+
+    def __init__(self, gauge: Gauge, domain: str) -> None:
+        self._gauge = gauge
+        self._domain = domain
+        self._start = time.monotonic()
+        self._should_observe = False
+
+    def success(self) -> None:
+        """Mark the request as successful so the duration is recorded."""
+        self._should_observe = True
+
+    def _finalize(self) -> None:
+        if self._should_observe:
+            self._gauge.labels(domain=self._domain).set(
+                max(time.monotonic() - self._start, 0)
+            )
+        else:
+            with suppress(KeyError):
+                self._gauge.remove(self._domain)
+
+
+class MetricsService:
+    """Manages Prometheus metrics with an isolated registry."""
+
+    def __init__(self) -> None:
+        """Initialize metrics with a custom collector registry."""
+        self.registry = CollectorRegistry()
+
+        self.notification_delivery_total = Counter(
+            "owncastsentry_notification_delivery_total",
+            "Total notification delivery attempts to individual rooms",
+            ["type", "result"],
+            registry=self.registry,
+        )
+        self.stream_status = Gauge(
+            "owncastsentry_stream_status",
+            "Current stream status (1=online, 0=offline, -1=unknown)",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.stream_subscriptions = Gauge(
+            "owncastsentry_stream_subscriptions",
+            "Number of room subscriptions per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.check_failures = Gauge(
+            "owncastsentry_check_failures",
+            "Consecutive check failure count per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.api_response_seconds = Gauge(
+            "owncastsentry_api_response_seconds",
+            "Last successful HTTP response time in seconds per stream domain",
+            ["domain"],
+            registry=self.registry,
+        )
+        self.build_info = Info(
+            "owncastsentry",
+            "OwncastSentry build information",
+            registry=self.registry,
+        )
+        self.open_connections = Gauge(
+            "owncastsentry_http_connections_open",
+            "Total number of open HTTP connections (idle and active)",
+            registry=self.registry,
+        )
+        self.errors_total = Counter(
+            "owncastsentry_errors_total",
+            "Internal errors by source",
+            ["source"],
+            registry=self.registry,
+        )
+
+        # Initialize all known label combinations so they start at 0
+        for notification_type in NotificationType:
+            for result in ("success", "failure"):
+                self.notification_delivery_total.labels(
+                    type=notification_type, result=result
+                )
+        for source in ErrorSource:
+            self.errors_total.labels(source=source)
+
+    def record_delivery(
+        self,
+        notification_type: NotificationType,
+        *,
+        successful: int = 0,
+        failed: int = 0,
+    ) -> None:
+        """Record notification delivery results.
+
+        :param notification_type: The type of notification delivered.
+        :param successful: Number of successful room deliveries.
+        :param failed: Number of failed room deliveries.
+        """
+        self.notification_delivery_total.labels(
+            type=notification_type, result="success"
+        ).inc(successful)
+        self.notification_delivery_total.labels(
+            type=notification_type, result="failure"
+        ).inc(failed)
+
+    def set_stream_status(self, domain: str, status: StreamStatus) -> None:
+        """Set the status gauge for a stream domain.
+
+        :param domain: The stream domain.
+        :param status: The current stream status.
+        """
+        self.stream_status.labels(domain=domain).set(_STATUS_VALUES[status])
+
+    def set_check_failures(self, domain: str, count: int) -> None:
+        """Set the consecutive failure count for a stream domain.
+
+        :param domain: The stream domain.
+        :param count: The current failure counter value.
+        """
+        self.check_failures.labels(domain=domain).set(count)
+
+    def set_subscription_count(self, domain: str, count: int) -> None:
+        """Set the subscription count for a stream domain.
+
+        :param domain: The stream domain.
+        :param count: The number of room subscriptions.
+        """
+        self.stream_subscriptions.labels(domain=domain).set(count)
+
+    @contextmanager
+    def response_timer(self, domain: str) -> Generator[_ResponseTimer]:
+        """Return a context manager that times an HTTP request.
+
+        Call ``timer.success()`` inside the block to record the duration.
+        If ``success()`` is never called, nothing is recorded.
+
+        :param domain: The stream domain being queried.
+        """
+        timer = _ResponseTimer(self.api_response_seconds, domain)
+        try:
+            yield timer
+        finally:
+            timer._finalize()
+
+    def set_build_info(self, version: str) -> None:
+        """Set the build version info metric.
+
+        :param version: The plugin version string.
+        """
+        self.build_info.info({"version": version})
+
+    def register_open_connections_gauge(self, callback: Callable[[], float]) -> None:
+        """Register a gauge that reads open connection count on scrape.
+
+        :param callback: Function returning the current open count.
+        """
+        self.open_connections.set_function(callback)
+
+    def record_error(self, source: ErrorSource) -> None:
+        """Increment the internal error counter.
+
+        :param source: The source of the error.
+        """
+        self.errors_total.labels(source=source).inc()
+
+    def remove_stream(self, domain: str) -> None:
+        """Remove a stream's gauge labels after cleanup deletion.
+
+        :param domain: The stream domain to remove.
+        """
+        with suppress(KeyError):
+            self.stream_status.remove(domain)
+        with suppress(KeyError):
+            self.check_failures.remove(domain)
+        with suppress(KeyError):
+            self.stream_subscriptions.remove(domain)
+        with suppress(KeyError):
+            self.api_response_seconds.remove(domain)

owncastsentry/migrations.py

@@ -0,0 +1,100 @@
+# 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

@@ -0,0 +1,124 @@
+# 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

@@ -0,0 +1,272 @@
+# 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.
+
+"""Notification service for sending Matrix messages."""
+
+import asyncio
+import time
+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 .database import SubscriptionRepository
+    from .metrics import MetricsService
+
+
+class NotificationService:
+    """Service for sending Matrix notifications about stream events."""
+
+    def __init__(
+        self,
+        client: Any,
+        subscription_repo: SubscriptionRepository,
+        logger: logging.Logger,
+        metrics: MetricsService,
+    ) -> None:
+        """Initialize the notification service.
+
+        :param client: The Matrix client for sending messages.
+        :param subscription_repo: Repository for managing subscriptions.
+        :param logger: Logger instance for debugging.
+        :param metrics: Metrics service for recording counters.
+        """
+        self.client = client
+        self.subscription_repo = subscription_repo
+        self.log = logger
+        self.metrics = metrics
+
+        # Cache for tracking when notifications were last sent
+        self.notification_timers_cache: dict[str, float] = {}
+
+    async def notify_stream_live(
+        self,
+        domain: str,
+        name: str,
+        title: str,
+        tags: list[str],
+        *,
+        title_change: bool = False,
+    ) -> None:
+        """Send notifications to rooms subscribed to a stream.
+
+        :param domain: The stream domain to send notifications for.
+        :param name: The stream name to include in the message.
+        :param title: The stream title to include in the message.
+        :param tags: List of stream tags to include in the message.
+        :param title_change: Whether this is a title change notification.
+        """
+        # Has enough time passed since the last notification was sent?
+        if not self._can_notify(domain):
+            seconds_since_last = round(
+                time.time() - self.notification_timers_cache[domain]
+            )
+            self.log.info(
+                f"[{domain}] Not sending notifications. Only "
+                f"{seconds_since_last} of required "
+                f"{SECONDS_BETWEEN_NOTIFICATIONS} seconds have "
+                f"passed since last notification."
+            )
+            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)
+
+        # Send notifications to all subscribed rooms in parallel
+        successful, failed = await self._broadcast_to_rooms(domain, body_text)
+
+        # Log completion
+        notification_type = "title change" if title_change else "going live"
+        self.log.info(
+            f"[{domain}] Completed sending {notification_type} "
+            f"notifications! {successful} succeeded, "
+            f"{failed} failed."
+        )
+
+        self.metrics.record_delivery(
+            NotificationType.TITLE_CHANGE if title_change else NotificationType.LIVE,
+            successful=successful,
+            failed=failed,
+        )
+
+    async def _send_notification(
+        self, room_id: str, body_text: str, domain: str
+    ) -> None:
+        """Send a notification to a single room.
+
+        :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.
+        """
+        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 "
+                f"message to room [{room_id}]: {exception}"
+            )
+            raise
+
+    def _format_message(
+        self, name: str, title: str, domain: str, tags: list[str], title_change: bool
+    ) -> str:
+        """Format the notification message body.
+
+        :param name: The stream name.
+        :param title: The stream title.
+        :param domain: The stream domain.
+        :param tags: List of stream tags.
+        :param title_change: Whether this is a title change notification.
+        :return: Formatted message body.
+        """
+        # Use name if available, fallback to domain
+        stream_name = name or domain
+        safe_stream_name = sanitize_for_plain_text(stream_name)
+
+        # Choose message based on notification type
+        if title_change:
+            parts = [f"📝 {safe_stream_name} has changed its stream title!"]
+        else:
+            parts = [f"🎥 {safe_stream_name} is now live!"]
+
+        # Add title if present
+        if title:
+            safe_title = sanitize_for_plain_text(title)
+            parts.append(f"\nStream Title: {safe_title}")
+
+        # Add stream URL
+        parts.append(f"\n\nTo tune in, visit: https://{domain}/")
+
+        # Add tags if present
+        if tags:
+            safe_tags = [
+                safe_tag
+                for tag in tags
+                if (safe_tag := sanitize_for_plain_text(tag))
+                and not safe_tag.startswith(".")
+            ]
+
+            if safe_tags:
+                parts.append(f"\n\n{' '.join(f'#{tag}' for tag in safe_tags)}")
+
+        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:
+            return True
+
+        seconds_since_last = round(
+            time.monotonic() - self.notification_timers_cache[domain]
+        )
+        return seconds_since_last >= SECONDS_BETWEEN_NOTIFICATIONS
+
+    def _record_notification(self, domain: str) -> None:
+        """Record that a notification was sent at the current time.
+
+        :param domain: The stream domain.
+        """
+        self.notification_timers_cache[domain] = time.monotonic()
+
+    async def _broadcast_to_rooms(self, domain: str, body_text: str) -> tuple[int, int]:
+        """Send a message to all rooms subscribed to a domain.
+
+        :param domain: The stream domain.
+        :param body_text: The message body text.
+        :return: Tuple of (successful, failed) counts.
+        """
+        room_ids = await self.subscription_repo.get_subscribed_rooms(domain)
+        tasks = [
+            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))
+        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

@@ -0,0 +1,170 @@
+# 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.
+
+"""HTTP client for querying Owncast instance APIs."""
+
+from typing import TYPE_CHECKING, Any
+
+import aiohttp
+
+from .models import StreamConfig, StreamState
+from .utils import (
+    OWNCAST_CONFIG_PATH,
+    OWNCAST_STATUS_PATH,
+    REQUIRED_STATUS_FIELDS,
+    user_agent,
+)
+
+if TYPE_CHECKING:
+    import logging
+
+    from .metrics import MetricsService
+
+
+class OwncastClient:
+    """HTTP client for communicating with Owncast instances."""
+
+    def __init__(
+        self,
+        logger: logging.Logger,
+        version: str,
+        metrics: MetricsService,
+    ) -> None:
+        """Initialize the Owncast client with an HTTP session.
+
+        :param logger: Logger instance for debugging
+        :param version: Plugin version string for the User-Agent header
+        :param metrics: Metrics service for recording response times.
+        """
+        self.log = logger
+        self.metrics = metrics
+
+        # Set up HTTP session configuration
+        headers = {"User-Agent": user_agent(version)}
+        cookie_jar = aiohttp.DummyCookieJar()
+        connector = aiohttp.TCPConnector(
+            use_dns_cache=False,
+            limit=1000,
+            limit_per_host=1,
+            keepalive_timeout=120,
+        )
+        timeout = aiohttp.ClientTimeout(sock_connect=5, sock_read=5)
+
+        self.session = aiohttp.ClientSession(
+            headers=headers,
+            cookie_jar=cookie_jar,
+            timeout=timeout,
+            connector=connector,
+        )
+
+    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 != 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.
+        """
+        self.log.debug(f"[{domain}] Fetching current stream state...")
+        with self.metrics.response_timer(domain) as timer:
+            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
+            missing = REQUIRED_STATUS_FIELDS - new_state.keys()
+            if missing:
+                self.log.warning(
+                    f"[{domain}] Rejecting response to request on "
+                    f"{OWNCAST_STATUS_PATH} as it is missing "
+                    f"fields: {', '.join(sorted(missing))}"
+                )
+                return None
+
+            timer.success()
+            return StreamState.from_api_response(new_state, domain)
+
+    async def get_stream_config(self, domain: str) -> StreamConfig | 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.
+        """
+        self.log.debug(f"[{domain}] Fetching current stream config...")
+        with self.metrics.response_timer(domain) as timer:
+            config = await self._fetch_json(domain, OWNCAST_CONFIG_PATH)
+            if config is None:
+                return None
+
+            timer.success()
+            return StreamConfig.from_api_response(config)
+
+    async def validate_instance(self, domain: str) -> bool:
+        """Validate that a domain is a valid Owncast instance.
+
+        :param domain: The domain to validate
+        :return: True if valid Owncast instance, False otherwise
+        """
+        state = await self.get_stream_state(domain)
+        return state is not None
+
+    @property
+    def open_connection_count(self) -> int:
+        """Return the total number of open HTTP connections."""
+        connector = self.session.connector
+        if connector is None:
+            return 0
+        idle = sum(len(conns) for conns in connector._conns.values())
+        active = len(connector._acquired)
+        return idle + active
+
+    async def close(self) -> None:
+        """Close the HTTP session."""
+        await self.session.close()

owncastsentry/stream_monitor.py

@@ -0,0 +1,359 @@
+# 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.
+
+"""Stream monitoring service for OwncastSentry."""
+
+import asyncio
+import time
+from typing import TYPE_CHECKING
+
+from .models import StreamState, StreamStatus, UpdateResult
+from .utils import (
+    CLEANUP_DELETE_THRESHOLD,
+    CLEANUP_WARNING_THRESHOLD,
+    TEMPORARY_OFFLINE_NOTIFICATION_COOLDOWN,
+    should_query_stream,
+)
+
+if TYPE_CHECKING:
+    import logging
+
+    from .database import StreamRepository, SubscriptionRepository
+    from .metrics import MetricsService
+    from .notification_service import NotificationService
+    from .owncast_client import OwncastClient
+
+
+class StreamMonitor:
+    """Monitors Owncast streams and detects state changes."""
+
+    def __init__(
+        self,
+        owncast_client: OwncastClient,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+        notification_service: NotificationService,
+        logger: logging.Logger,
+        metrics: MetricsService,
+    ) -> None:
+        """Initialize the stream monitor.
+
+        :param owncast_client: Client for making API calls to Owncast instances.
+        :param stream_repo: Repository for stream data.
+        :param subscription_repo: Repository for subscription data.
+        :param notification_service: Service for sending notifications.
+        :param logger: Logger instance for debugging.
+        :param metrics: Metrics service for recording Prometheus metrics.
+        """
+        self.owncast_client = owncast_client
+        self.stream_repo = stream_repo
+        self.subscription_repo = subscription_repo
+        self.notification_service = notification_service
+        self.log = logger
+        self.metrics = metrics
+
+        # Cache for tracking when streams last went offline
+        self.offline_timer_cache: dict[str, float] = {}
+
+    async def update_all_streams(self, subscribed_domains: list[str]) -> UpdateResult:
+        """Check the status of all streams with active subscriptions.
+
+        Updates for all streams are performed asynchronously, with the
+        method returning when the slowest update completes.
+
+        :param subscribed_domains: List of stream domains to update.
+        :return: UpdateResult with success/failure counts.
+        """
+        self.log.debug("Updating all stream states...")
+
+        total_streams = len(subscribed_domains)
+
+        # Build a list of async tasks for each stream domain
+        # Run all stream updates in parallel and collect results
+        results = await asyncio.gather(
+            *(self.update_stream(domain) for domain in subscribed_domains)
+        )
+
+        # Count successes and failures
+        successful_checks = results.count(True)
+        failed_checks = results.count(False)
+
+        self.log.debug(
+            f"Update complete. {successful_checks}/{total_streams} succeeded, "
+            f"{failed_checks} failed."
+        )
+
+        for domain in subscribed_domains:
+            count = await self.subscription_repo.count_by_domain(domain)
+            self.metrics.set_subscription_count(domain, count)
+
+        return UpdateResult(
+            total_streams=total_streams,
+            successful_checks=successful_checks,
+            failed_checks=failed_checks,
+        )
+
+    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
+        live. Implements progressive backoff for connection 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.
+        """
+        # Fetch the current stream state from database to check failure_counter
+        old_state = await self.stream_repo.get_by_domain(domain)
+        failure_counter = old_state.failure_counter if old_state else 0
+
+        if old_state is None:
+            return True
+
+        # Check if we should query this stream based on backoff schedule
+        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 "
+                f"(counter={failure_counter + 1})"
+            )
+            # Check cleanup thresholds even when skipping query
+            await self._check_cleanup_thresholds(domain, failure_counter + 1)
+            updated_state = await self.stream_repo.get_by_domain(domain)
+            if updated_state is not None:
+                self.metrics.set_stream_status(domain, updated_state.status)
+            self.metrics.set_check_failures(domain, failure_counter + 1)
+            # 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)
+
+        # If the fetch failed, increment failure counter and skip the update
+        if new_state is None:
+            await self.stream_repo.increment_failure_counter(domain)
+            self.log.warning(
+                f"[{domain}] Connection failure (counter={failure_counter + 1})"
+            )
+            # Check cleanup thresholds after connection failure
+            await self._check_cleanup_thresholds(domain, failure_counter + 1)
+            updated_state = await self.stream_repo.get_by_domain(domain)
+            if updated_state is not None:
+                self.metrics.set_stream_status(domain, updated_state.status)
+            self.metrics.set_check_failures(domain, failure_counter + 1)
+            # Actual connection failure
+            return False
+
+        # Fetch succeeded! Reset failure counter
+        await self.stream_repo.reset_failure_counter(domain)
+        self.metrics.set_check_failures(domain, 0)
+
+        # 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?
+        if (
+            old_state.last_connect_time is None
+            and old_state.last_disconnect_time is None
+        ):
+            # 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?
+        if (
+            new_state.last_connect_time is not None
+            and old_state.last_connect_time is None
+        ):
+            # Yes! This stream is now live.
+            update_database = True
+            stream_config = await self.owncast_client.get_stream_config(domain)
+
+            self.log.info(f"[{domain}] Stream is now live!")
+
+            # Calculate seconds since the stream last went offline
+            seconds_since_last_offline = round(
+                time.monotonic() - self.offline_timer_cache[domain]
+            )
+
+            # Have we queried this stream before?
+            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
+            and old_state.last_connect_time is not None
+        ):
+            # Did the stream title change mid-session?
+            if old_state.title != new_state.title:
+                self.log.info(f"[{domain}] Stream title was changed!")
+                update_database = True
+                stream_config = await self.owncast_client.get_stream_config(domain)
+
+                # 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 []
+
+                # 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 "",
+                        stream_tags,
+                        title_change=False,
+                    )
+                else:
+                    # No. Send a normal title change notification.
+                    await self.notification_service.notify_stream_live(
+                        domain,
+                        stream_name,
+                        new_state.title or "",
+                        stream_tags,
+                        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.")
+        if new_state.last_connect_time is not None:
+            self.metrics.set_stream_status(domain, StreamStatus.ONLINE)
+        else:
+            self.metrics.set_stream_status(domain, StreamStatus.OFFLINE)
+        return True
+
+    async def _check_cleanup_thresholds(self, domain: str, counter: int) -> None:
+        """Check if a domain hit cleanup warning or deletion thresholds.
+
+        :param domain: The domain to check.
+        :param counter: The current failure counter value.
+        """
+        # Check for 83-day warning threshold
+        if counter == CLEANUP_WARNING_THRESHOLD:
+            self.log.warning(
+                f"[{domain}] Reached 83-day warning threshold. Sending cleanup warning."
+            )
+            await self.notification_service.send_cleanup_warning(domain)
+
+        # Check for 90-day deletion threshold
+        if counter >= CLEANUP_DELETE_THRESHOLD:
+            self.log.warning(
+                f"[{domain}] Reached 90-day deletion threshold."
+                f" Removing all subscriptions."
+            )
+            # Send deletion notification
+            await self.notification_service.send_cleanup_deletion(domain)
+
+            # Delete all subscriptions for this domain
+            deleted_count = await self.subscription_repo.delete_all_for_domain(domain)
+
+            # Delete the stream record
+            await self.stream_repo.delete(domain)
+
+            self.log.info(
+                f"[{domain}] Cleanup complete. "
+                f"Deleted {deleted_count} subscriptions "
+                f"and stream record."
+            )
+            self.metrics.remove_stream(domain)

owncastsentry/utils.py

@@ -0,0 +1,205 @@
+# 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

@@ -0,0 +1,117 @@
+[project]
+name = "owncastsentry"
+dynamic = ["version"]
+description = "A maubot plugin that monitors Owncast streams and sends Matrix notifications"
+authors = [
+    { name = "Logan Fick" },
+]
+license = "Apache-2.0"
+requires-python = ">=3.14"
+dependencies = ["prometheus_client>=0.24.1"]
+
+[project.urls]
+Repository = "https://git.logal.dev/LogalDeveloper/OwncastSentry"
+
+[build-system]
+requires = ["hatchling>=1.29.0", "hatch-vcs>=0.5.0"]
+build-backend = "hatchling.build"
+
+[dependency-groups]
+dev = [
+    "maubot[encryption]>=0.6.0",
+    "aioresponses>=0.7.8",
+    "codespell>=2.4.2",
+    "hatch>=1.16.5",
+    "mypy>=1.19.1",
+    "pip-audit>=2.10.0",
+    "pytest>=9.0.2",
+    "pytest-asyncio>=1.3.0",
+    "pytest-cov>=7.0.0",
+    "ruff>=0.15.6",
+    "time-machine>=3.2.0",
+]
+
+[tool.hatch.version]
+source = "vcs"
+
+[tool.hatch.build.hooks.vcs]
+version-file = "owncastsentry/_version.py"
+
+[tool.mypy]
+python_version = "3.14"
+strict = true
+warn_unreachable = true
+explicit_package_bases = true
+exclude = ["owncastsentry/_version\\.py", "tests/"]
+
+[tool.ruff]
+target-version = "py314"
+extend-exclude = ["owncastsentry/_version.py"]  # auto-generated by hatch-vcs
+
+[tool.ruff.lint]
+select = [
+    # 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 = [
+    "D203",  # incompatible with D211 (no blank line before class docstring)
+    "D213",  # incompatible with D212 (summary on first line)
+]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**" = ["S101"]
+
+[tool.coverage.run]
+source = ["owncastsentry"]
+omit = ["owncastsentry/_version.py"]
+
+[tool.coverage.report]
+show_missing = true
+skip_empty = true
+
+[tool.codespell]
+skip = "uv.lock"

tests/__init__.py

@@ -0,0 +1,15 @@
+# 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.
+
+"""OwncastSentry test suite."""

tests/conftest.py

@@ -0,0 +1,223 @@
+# 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.
+
+"""Shared test fixtures and stubs for OwncastSentry tests."""
+
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING, Any
+
+import pytest
+from mautrix.util.async_db import Database
+from prometheus_client import generate_latest
+
+from owncastsentry import OwncastSentry
+from owncastsentry.config import Config
+from owncastsentry.database import StreamRepository, SubscriptionRepository
+from owncastsentry.migrations import get_upgrade_table
+
+if TYPE_CHECKING:
+    from collections.abc import AsyncIterator
+    from pathlib import Path
+
+    from owncastsentry.metrics import MetricsService
+    from owncastsentry.models import StreamConfig, StreamState
+
+
+def generate_metrics_output(metrics: MetricsService) -> str:
+    """Generate Prometheus text format output from a MetricsService registry."""
+    return generate_latest(metrics.registry).decode("utf-8")
+
+
+@pytest.fixture
+async def database(tmp_path: Path) -> AsyncIterator[Database]:
+    """Yield a real SQLite-backed mautrix Database with migrations applied."""
+    db_path = tmp_path / "test.db"
+    db = Database.create(
+        f"sqlite:///{db_path}",
+        upgrade_table=get_upgrade_table(),
+    )
+    await db.start()
+    yield db
+    await db.stop()
+
+
+@pytest.fixture
+def stream_repo(database: Database) -> StreamRepository:
+    """Return a StreamRepository backed by the test database."""
+    return StreamRepository(database)
+
+
+@pytest.fixture
+def subscription_repo(database: Database) -> SubscriptionRepository:
+    """Return a SubscriptionRepository backed by the test database."""
+    return SubscriptionRepository(database)
+
+
+# These fixtures use names expected by the maubot.testing framework.
+# They look unused but are discovered automatically by maubot's pytest plugin.
+
+
+@pytest.fixture
+def maubot_plugin_class():
+    """Use OwncastSentry as the plugin class for maubot integration tests."""
+    return OwncastSentry
+
+
+@pytest.fixture
+def maubot_plugin_config_class():
+    """Use our Config class for maubot integration tests."""
+    return Config
+
+
+@pytest.fixture
+def maubot_upgrade_table():
+    """Provide the database upgrade table for maubot integration tests."""
+    return get_upgrade_table()
+
+
+VALID_CONFIG_RESPONSE: dict[str, object] = {
+    "appearanceVariables": {},
+    "name": "LogalDeveloper's Live Stream",
+    "customStyles": "",
+    "streamTitle": "I think I can do this... Let's start a nuclear reaction - Playing Nucleares!",  # noqa: E501
+    "offlineMessage": "<p>HTTP/1.1 204 No Content</p>\n<p>You've reached the right place, but I'm not live right now.</p>",  # noqa: E501
+    "logo": "/logo",
+    "version": "Owncast v0.2.4-linux-64bit (8e89391309dd3aa4d0db4361a2ba1e144f42f8c8)",
+    "extraPageContent": (
+        "<h1>About</h1>\n<p>Hi there! I'm Logan, a cybersecurity professional "
+        "with a background in Linux systems and network administration. This is my "
+        "little corner of the internet where I exclusively run my live streams. While "
+        "gaming is my most common stream topic, I occasionally stream other things "
+        "which interest me, such as cybersecurity challenges. If you are looking for "
+        "my main website, where my blog and project directory is hosted, please visit: "
+        '<a href="https://logal.dev/">https://logal.dev/</a></p>\n<p>Any views and '
+        "opinions expressed in my live streams and videos are my own and do not "
+        "necessarily reflect those of my employer or any affiliated organizations."
+        "</p>\n<h1>Following</h1>\n<p>I don\u2019t stick to a strict streaming "
+        "schedule, but there are a few ways to stay updated so you know when I go "
+        "live:</p>\n<ul>\n<li>\u2b50 <strong>Matrix</strong>: Send the message "
+        "<code>!subscribe stream.logal.dev</code> to "
+        '<a href="https://matrix.to/#/@owncastsentry:logal.dev">'
+        "@owncastsentry:logal.dev</a>.</li>\n<li><strong>Fediverse</strong>: Follow "
+        "<code>@notify@stream.logal.dev</code>.</li>\n</ul>\n<h1>Chat Commands</h1>"
+        "\n<p>To make things more interactive, there are several commands you can "
+        "send in chat to play sound effects live on stream:</p>\n<ul>\n"
+        "<li>!boom</li>\n<li>!bluetooth</li>\n<li>!bruh</li>\n<li>!creeper</li>\n"
+        "<li>!directed</li>\n<li>!fart</li>\n<li>!icetea</li>\n<li>!oof</li>\n"
+        "<li>!perfect</li>\n<li>!spare</li>\n<li>!thatsit</li>\n<li>!usb</li>\n"
+        "<li>!whocares</li>\n<li>!yoda</li>\n</ul>"
+    ),
+    "summary": "Video games, cybersecurity, and more!",
+    "tags": [
+        "video games",
+        "chatting",
+        "casual",
+        "english",
+        "streaming",
+        "owncast",
+        "variety",
+    ],
+    "socialHandles": None,
+    "externalActions": [
+        {
+            "url": "https://ko-fi.com/logaldeveloper",
+            "html": "",
+            "title": "Tip",
+            "description": "",
+            "icon": "https://stream.logal.dev/img/platformlogos/ko-fi.svg",
+            "color": "",
+            "openExternally": True,
+        },
+        {
+            "url": "https://tubefree.org/c/logaldeveloper_stream_archive",
+            "html": "",
+            "title": "Previous Live Stream Recordings",
+            "description": "",
+            "icon": "https://stream.logal.dev/img/platformlogos/fediverse.svg",
+            "color": "",
+            "openExternally": True,
+        },
+    ],
+    "notifications": {
+        "browser": {
+            "publicKey": "BI9BhIY6c7nfP6ZSIu7T53Lta5sGYqDqwSpiCabZ0XQxPQOmnUHRSjInaa3HX9XmYE-bV8SFmbFk4stZy2jnJ3M",  # noqa: E501
+            "enabled": True,
+        },
+    },
+    "federation": {
+        "account": "notify@stream.logal.dev",
+        "followerCount": 74,
+        "enabled": True,
+    },
+    "maxSocketPayloadSize": 2048,
+    "hideViewerCount": False,
+    "chatDisabled": False,
+    "chatSpamProtectionDisabled": False,
+    "nsfw": False,
+    "authentication": {"indieAuthEnabled": True},
+}
+
+VALID_STATUS_RESPONSE: dict[str, object] = {
+    "serverTime": "2026-03-13T15:16:14.354962696-04:00",
+    "lastConnectTime": None,
+    "lastDisconnectTime": "2026-03-04T21:05:32-05:00",
+    "versionNumber": "0.2.4",
+    "streamTitle": "I think I can do this... Let's start a nuclear reaction - Playing Nucleares!",  # noqa: E501
+    "online": False,
+}
+
+
+@dataclass
+class _SentMessage:
+    """A message recorded by _StubMatrixClient."""
+
+    room_id: str
+    content: Any
+
+
+class _StubMatrixClient:
+    """Recording stub for the Matrix client used in notification tests."""
+
+    def __init__(self) -> None:
+        self.sent_messages: list[_SentMessage] = []
+        self.should_fail_for_rooms: set[str] = set()
+
+    async def send_message(self, room_id: str, content: Any) -> None:
+        """Record a sent message, or raise if room is in the fail set."""
+        if room_id in self.should_fail_for_rooms:
+            msg = f"Stubbed failure for room {room_id}"
+            raise RuntimeError(msg)
+        self.sent_messages.append(_SentMessage(room_id=room_id, content=content))
+
+
+@dataclass
+class _StubOwncastClient:
+    """Configurable stub for the Owncast HTTP client."""
+
+    stream_state: StreamState | None = None
+    stream_config: StreamConfig | 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:
+        """Return the configured stream state."""
+        self.state_call_count += 1
+        self.queried_domains.append(domain)
+        return self.stream_state
+
+    async def get_stream_config(self, domain: str) -> StreamConfig | None:
+        """Return the configured stream config."""
+        self.config_call_count += 1
+        return self.stream_config

tests/test_commands.py

@@ -0,0 +1,506 @@
+# 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 bot command handlers."""
+
+import json
+import logging
+from datetime import UTC, datetime, timedelta
+from unittest.mock import MagicMock
+
+import pytest
+import time_machine
+from aioresponses import aioresponses
+
+from owncastsentry.commands import CommandHandler
+from owncastsentry.models import StreamState
+from owncastsentry.utils import OWNCAST_STATUS_PATH, UNKNOWN_STATUS_THRESHOLD
+from tests.conftest import VALID_STATUS_RESPONSE
+
+
+def _make_command_handler() -> CommandHandler:
+    """Build a CommandHandler with dummy dependencies for pure logic tests."""
+    return CommandHandler(
+        owncast_client=MagicMock(),
+        stream_repo=MagicMock(),
+        subscription_repo=MagicMock(),
+        logger=logging.getLogger("test"),
+    )
+
+
+class TestFormatDuration:
+    """Elapsed time calculation from ISO timestamps."""
+
+    _NOW = datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC)
+
+    @pytest.mark.parametrize(
+        ("seconds_ago", "expected"),
+        [
+            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(120, "2 minutes", id="plural-minutes"),
+            pytest.param(3600, "1 hour", id="singular-hour"),
+            pytest.param(7200, "2 hours", id="plural-hours"),
+            pytest.param(86400, "1 day", id="singular-day"),
+            pytest.param(172800, "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)
+        assert result == expected
+
+    def test_invalid_timestamp(self) -> None:
+        """Return 'unknown duration' for unparsable timestamps."""
+        handler = _make_command_handler()
+        assert handler._format_duration("not-a-timestamp") == "unknown duration"
+
+
+class TestSubscribeCommand:
+    """Subscribe command end-to-end via maubot."""
+
+    async def test_subscribe_valid_stream(self, maubot_test_bot, maubot_plugin) -> None:
+        """Subscribe to a valid Owncast stream."""
+        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")
+
+        assert len(maubot_test_bot.responded) == 1
+        assert maubot_test_bot.responded[0].content.body == (
+            "Subscription added! This room will receive notifications when "
+            "stream.logal.dev goes live."
+        )
+
+    async def test_subscribe_invalid_stream(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """Reject subscription to an invalid Owncast instance."""
+        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")
+
+        assert len(maubot_test_bot.responded) == 1
+        assert maubot_test_bot.responded[0].content.body == (
+            "The URL you supplied does not appear to "
+            "be a valid Owncast instance. You may have "
+            "specified an invalid domain, or the "
+            "instance is offline."
+        )
+
+    async def test_subscribe_already_subscribed(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """Reject duplicate subscription in the same room."""
+        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")
+
+        # Second subscribe; stream already exists so validation is skipped
+        await maubot_test_bot.send("!subscribe stream.logal.dev")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "This room is already subscribed to notifications for stream.logal.dev."
+        )
+
+    async def test_subscribe_existing_stream_new_room(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """Skip instance validation when subscribing from a new room."""
+        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")
+
+        # Subscribe from a different room; skips validation and should not
+        # query the remote instance. An empty aioresponses context will raise
+        # ConnectionError if any HTTP request is attempted.
+        with aioresponses():
+            await maubot_test_bot.send(
+                "!subscribe stream.logal.dev", room_id="!otherroom:example.com"
+            )
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "Subscription added! This room will receive notifications when "
+            "stream.logal.dev goes live."
+        )
+
+
+class TestUnsubscribeCommand:
+    """Unsubscribe command end-to-end via maubot."""
+
+    async def test_unsubscribe_existing(self, maubot_test_bot, maubot_plugin) -> None:
+        """Unsubscribe from a subscribed stream."""
+        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_test_bot.send("!unsubscribe stream.logal.dev")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "Subscription removed! This room will no "
+            "longer receive notifications for stream.logal.dev."
+        )
+
+    async def test_unsubscribe_not_subscribed(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """Reject unsubscribe from a non-subscribed stream."""
+        await maubot_test_bot.send("!unsubscribe unknown.com")
+
+        assert len(maubot_test_bot.responded) == 1
+        assert maubot_test_bot.responded[0].content.body == (
+            "This room is already not subscribed to notifications for unknown.com."
+        )
+
+
+class TestSubscriptionsCommand:
+    """Subscriptions listing command end-to-end via maubot."""
+
+    async def test_no_subscriptions(self, maubot_test_bot, maubot_plugin) -> None:
+        """Show help text when no subscriptions exist."""
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 1
+        assert maubot_test_bot.responded[0].content.body == (
+            "This room is not subscribed to any Owncast "
+            "instances.\n\nTo subscribe to an Owncast "
+            "instance, use `!subscribe <domain>`"
+        )
+
+    @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:
+        """Show stream details including title and duration."""
+        # Subscribe first
+        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")
+
+        # Update stream state to be online with a name
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="stream.logal.dev",
+                name="Test Stream",
+                title="Playing Games",
+                last_connect_time="2026-01-01T12:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "**Subscriptions for this room (1):**\n\n"
+            "● **Test Stream** \n"
+            "  ○ Title: Playing Games\n"
+            "  ○ Status: Online for 71 days\n"
+            "  ○ Link: https://stream.logal.dev\n"
+            "To unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+    @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:
+        """Show offline status for non-live streams."""
+        # Subscribe first
+        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")
+
+        # Update stream state to be offline
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="stream.logal.dev",
+                name="Test Stream",
+                last_disconnect_time="2026-01-01T10:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "**Subscriptions for this room (1):**\n\n"
+            "● **Test Stream** \n"
+            "  ○ Status: Offline for 71 days\n"
+            "  ○ Link: https://stream.logal.dev\n"
+            "To unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+    async def test_shows_offline_stream_without_disconnect_time(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """Show offline status without duration before first poll completes."""
+        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")
+
+        # Stream row exists with no state yet - query subscriptions immediately
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "**Subscriptions for this room (1):**\n\n"
+            "● **stream.logal.dev** \n"
+            "  ○ Status: Offline\n"
+            "  ○ Link: https://stream.logal.dev\n"
+            "To unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+    async def test_shows_unknown_stream(self, maubot_test_bot, maubot_plugin) -> None:
+        """Show unknown status when instance has been unreachable."""
+        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")
+
+        # Increment failure counter past the unknown threshold
+        for _ in range(UNKNOWN_STATUS_THRESHOLD + 1):
+            await maubot_plugin.stream_repo.increment_failure_counter(
+                "stream.logal.dev"
+            )
+
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "**Subscriptions for this room (1):**\n\n"
+            "● **stream.logal.dev** \n"
+            "  ○ Status: Unknown (instance unreachable)\n"
+            "  ○ Link: https://stream.logal.dev\n"
+            "To unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+    @time_machine.travel(datetime(2026, 3, 13, 12, 0, 0, tzinfo=UTC))
+    async def test_shows_multiple_subscriptions(
+        self, maubot_test_bot, maubot_plugin
+    ) -> None:
+        """List subscriptions alphabetically with mixed statuses."""
+        # Subscribe in reverse alphabetical order to verify sorted output
+        with aioresponses() as mocked:
+            mocked.get(
+                f"https://beta.com{OWNCAST_STATUS_PATH}",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            mocked.get(
+                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 alpha online, beta offline
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="alpha.com",
+                name="Alpha Stream",
+                title="Streaming Live",
+                last_connect_time="2026-03-13T10:00:00Z",
+            )
+        )
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="beta.com",
+                name="Beta Stream",
+                last_disconnect_time="2026-03-12T18:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!subscriptions")
+
+        assert len(maubot_test_bot.responded) == 3
+        assert maubot_test_bot.responded[2].content.body == (
+            "**Subscriptions for this room (2):**\n\n"
+            "● **Alpha Stream**\n"
+            "  \n"
+            "  ○ Title: Streaming Live\n"
+            "  ○ Status: Online for 2 hours\n"
+            "  ○ Link: https://alpha.com\n"
+            "● **Beta Stream**\n"
+            "  \n"
+            "  ○ Status: Offline for 18 hours\n"
+            "  ○ Link: https://beta.com\n"
+            "To unsubscribe from any of these Owncast "
+            "instances, use `!unsubscribe <domain>`"
+        )
+
+
+class TestLiveCommand:
+    """Live streams listing command end-to-end via maubot."""
+
+    async def test_no_subscriptions(self, maubot_test_bot, maubot_plugin) -> None:
+        """Show help text when no subscriptions exist."""
+        await maubot_test_bot.send("!live")
+
+        assert len(maubot_test_bot.responded) == 1
+        assert maubot_test_bot.responded[0].content.body == (
+            "This room is not subscribed to any Owncast "
+            "instances.\n\nTo subscribe to an Owncast "
+            "instance, use `!subscribe <domain>`"
+        )
+
+    async def test_no_live_streams(self, maubot_test_bot, maubot_plugin) -> None:
+        """Show 'no live' message when all streams are offline."""
+        # Subscribe first
+        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")
+
+        # Update stream state to offline
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="stream.logal.dev",
+                name="Test Stream",
+                last_disconnect_time="2026-01-01T10:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!live")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "No subscribed Owncast instances are currently "
+            "live.\n\nUse `!subscriptions` to list all "
+            "subscriptions."
+        )
+
+    @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:
+        """Show live stream with title and duration."""
+        # Subscribe first
+        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")
+
+        # Update stream state to online
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="stream.logal.dev",
+                name="Test Stream",
+                title="Playing Games",
+                last_connect_time="2026-01-01T12:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!live")
+
+        assert len(maubot_test_bot.responded) == 2
+        assert maubot_test_bot.responded[1].content.body == (
+            "**Live Owncast instances (1):**\n\n"
+            "● **Test Stream** \n"
+            "  ○ Title: Playing Games\n"
+            "  ○ Online for 71 days\n"
+            "  ○ Link: https://stream.logal.dev"
+        )
+
+    @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
+    ) -> None:
+        """List live streams alphabetically with different durations."""
+        # Subscribe in reverse alphabetical order to verify sorted output
+        with aioresponses() as mocked:
+            mocked.get(
+                f"https://beta.com{OWNCAST_STATUS_PATH}",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            mocked.get(
+                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
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="alpha.com",
+                name="Alpha Stream",
+                title="Morning Show",
+                last_connect_time="2026-03-13T10:00:00Z",
+            )
+        )
+        await maubot_plugin.stream_repo.update(
+            StreamState(
+                domain="beta.com",
+                name="Beta Stream",
+                title="Evening Vibes",
+                last_connect_time="2026-03-13T06:00:00Z",
+            )
+        )
+
+        await maubot_test_bot.send("!live")
+
+        assert len(maubot_test_bot.responded) == 3
+        assert maubot_test_bot.responded[2].content.body == (
+            "**Live Owncast instances (2):**\n\n"
+            "● **Alpha Stream**\n"
+            "  \n"
+            "  ○ Title: Morning Show\n"
+            "  ○ Online for 2 hours\n"
+            "  ○ Link: https://alpha.com\n"
+            "● **Beta Stream**\n"
+            "  \n"
+            "  ○ Title: Evening Vibes\n"
+            "  ○ Online for 6 hours\n"
+            "  ○ Link: https://beta.com"
+        )

tests/test_database.py

@@ -0,0 +1,148 @@
+# 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

@@ -0,0 +1,314 @@
+# 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 the Prometheus metrics service."""
+
+import pytest
+
+from owncastsentry.metrics import ErrorSource, MetricsService, NotificationType
+from owncastsentry.models import StreamStatus
+from tests.conftest import generate_metrics_output
+
+
+class TestRecordDelivery:
+    """Notification delivery counter with type and result labels."""
+
+    @pytest.mark.parametrize(
+        ("notification_type", "successful", "failed", "expected_fragments"),
+        [
+            pytest.param(
+                NotificationType.LIVE,
+                3,
+                0,
+                ['result="success",type="live"} 3.0'],
+                id="live-success",
+            ),
+            pytest.param(
+                NotificationType.LIVE,
+                0,
+                2,
+                ['result="failure",type="live"} 2.0'],
+                id="live-failure",
+            ),
+            pytest.param(
+                NotificationType.TITLE_CHANGE,
+                1,
+                0,
+                ['result="success",type="title_change"} 1.0'],
+                id="title-change-success",
+            ),
+            pytest.param(
+                NotificationType.CLEANUP_WARNING,
+                2,
+                0,
+                ['result="success",type="cleanup_warning"} 2.0'],
+                id="cleanup-warning-success",
+            ),
+            pytest.param(
+                NotificationType.CLEANUP_DELETION,
+                1,
+                1,
+                [
+                    'result="success",type="cleanup_deletion"} 1.0',
+                    'result="failure",type="cleanup_deletion"} 1.0',
+                ],
+                id="cleanup-deletion-mixed",
+            ),
+        ],
+    )
+    def test_records_delivery(
+        self,
+        notification_type: NotificationType,
+        successful: int,
+        failed: int,
+        expected_fragments: list[str],
+    ) -> None:
+        """Record delivery results with correct type and result labels."""
+        service = MetricsService()
+        service.record_delivery(notification_type, successful=successful, failed=failed)
+        output = generate_metrics_output(service)
+        for fragment in expected_fragments:
+            assert fragment in output
+
+    @pytest.mark.parametrize(
+        ("notification_type", "result"),
+        [
+            pytest.param(t, r, id=f"{t}-{r}")
+            for t in NotificationType
+            for r in ("success", "failure")
+        ],
+    )
+    def test_all_combinations_initialized(
+        self, notification_type: NotificationType, result: str
+    ) -> None:
+        """All type/result label combinations exist at zero on init."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        expected = (
+            f"owncastsentry_notification_delivery_total"
+            f'{{result="{result}",type="{notification_type}"}} 0.0'
+        )
+        assert expected in output
+
+
+class TestSetStreamStatus:
+    """Per-stream status gauge."""
+
+    @pytest.mark.parametrize(
+        ("status", "expected_value"),
+        [
+            pytest.param(StreamStatus.ONLINE, 1.0, id="online"),
+            pytest.param(StreamStatus.OFFLINE, 0.0, id="offline"),
+            pytest.param(StreamStatus.UNKNOWN, -1.0, id="unknown"),
+        ],
+    )
+    def test_sets_status(self, status: StreamStatus, expected_value: float) -> None:
+        """Set gauge to the correct value for each stream status."""
+        service = MetricsService()
+        service.set_stream_status("test.com", status)
+        output = generate_metrics_output(service)
+        expected = f'owncastsentry_stream_status{{domain="test.com"}} {expected_value}'
+        assert expected in output
+
+
+class TestSetSubscriptionCount:
+    """Per-stream subscription count gauge."""
+
+    def test_sets_count(self) -> None:
+        """Set the subscription count for a domain."""
+        service = MetricsService()
+        service.set_subscription_count("test.com", 5)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_stream_subscriptions{domain="test.com"} 5.0' in output
+
+    def test_updates_count(self) -> None:
+        """Update the subscription count for a domain."""
+        service = MetricsService()
+        service.set_subscription_count("test.com", 5)
+        service.set_subscription_count("test.com", 3)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_stream_subscriptions{domain="test.com"} 3.0' in output
+
+
+class TestSetCheckFailures:
+    """Check failure counter gauge per domain."""
+
+    def test_sets_count(self) -> None:
+        """Set the failure count for a domain."""
+        service = MetricsService()
+        service.set_check_failures("fail.com", 3)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_check_failures{domain="fail.com"} 3.0' in output
+
+    def test_resets_to_zero(self) -> None:
+        """Reset the failure count to zero."""
+        service = MetricsService()
+        service.set_check_failures("fail.com", 5)
+        service.set_check_failures("fail.com", 0)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_check_failures{domain="fail.com"} 0.0' in output
+
+
+class TestResponseTimer:
+    """Response time gauge via context manager."""
+
+    def test_records_on_success(self) -> None:
+        """Record a response time when success() is called."""
+        service = MetricsService()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' in output
+
+    def test_does_not_record_without_success(self) -> None:
+        """Do not record when success() is never called."""
+        service = MetricsService()
+        with service.response_timer("example.com"):
+            pass
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+
+    def test_overwrites_previous_value(self) -> None:
+        """Overwrite previous value with the latest response time."""
+        service = MetricsService()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        with service.response_timer("example.com") as timer:
+            timer.success()
+        output = generate_metrics_output(service)
+        # Gauge should have exactly one line for this domain, not accumulated
+        matches = [
+            line
+            for line in output.splitlines()
+            if line.startswith("owncastsentry_api_response_seconds{")
+        ]
+        assert len(matches) == 1
+
+    def test_does_not_record_on_exception(self) -> None:
+        """Do not record when the block raises an exception."""
+        service = MetricsService()
+        with (
+            pytest.raises(ValueError, match="boom"),
+            service.response_timer("example.com"),
+        ):
+            raise ValueError("boom")
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+
+
+class TestRemoveStream:
+    """Stale stream label cleanup."""
+
+    def test_removes_stream_label(self) -> None:
+        """Remove a stream's gauge labels after cleanup deletion."""
+        service = MetricsService()
+        service.set_stream_status("gone.com", StreamStatus.OFFLINE)
+        service.set_subscription_count("gone.com", 2)
+        assert 'domain="gone.com"' in generate_metrics_output(service)
+        service.remove_stream("gone.com")
+        assert 'domain="gone.com"' not in generate_metrics_output(service)
+
+    def test_remove_nonexistent_is_noop(self) -> None:
+        """Removing a nonexistent stream does not raise."""
+        service = MetricsService()
+        service.remove_stream("never.com")
+
+
+class TestRegisterOpenConnectionsGauge:
+    """Callback-based open connection gauge."""
+
+    def test_reads_value_from_callback(self) -> None:
+        """Read the open connection count from the callback at scrape time."""
+        service = MetricsService()
+        counter = [3]
+        service.register_open_connections_gauge(lambda: counter[0])
+        output = generate_metrics_output(service)
+        assert "owncastsentry_http_connections_open 3.0" in output
+
+    def test_reflects_updated_value(self) -> None:
+        """Reflect changes in the callback value on subsequent scrapes."""
+        service = MetricsService()
+        counter = [1]
+        service.register_open_connections_gauge(lambda: counter[0])
+        counter[0] = 5
+        output = generate_metrics_output(service)
+        assert "owncastsentry_http_connections_open 5.0" in output
+
+
+class TestSetBuildInfo:
+    """Build version info metric."""
+
+    def test_sets_version(self) -> None:
+        """Set the build version info."""
+        service = MetricsService()
+        service.set_build_info("1.2.3")
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_info{version="1.2.3"} 1.0' in output
+
+
+class TestRecordError:
+    """Internal error counter."""
+
+    def test_increments_counter(self) -> None:
+        """Increment the error counter for a source."""
+        service = MetricsService()
+        service.record_error(ErrorSource.SCHEDULER_LOOP)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_errors_total{source="scheduler_loop"} 1.0' in output
+
+    def test_increments_multiple_sources(self) -> None:
+        """Increment error counters for different sources independently."""
+        service = MetricsService()
+        service.record_error(ErrorSource.SCHEDULER_LOOP)
+        service.record_error(ErrorSource.COMMAND)
+        service.record_error(ErrorSource.COMMAND)
+        output = generate_metrics_output(service)
+        assert 'owncastsentry_errors_total{source="scheduler_loop"} 1.0' in output
+        assert 'owncastsentry_errors_total{source="command"} 2.0' in output
+
+    @pytest.mark.parametrize(
+        "source",
+        [pytest.param(s, id=s) for s in ErrorSource],
+    )
+    def test_all_sources_initialized(self, source: ErrorSource) -> None:
+        """All known source labels exist at zero on init."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        expected = f'owncastsentry_errors_total{{source="{source}"}} 0.0'
+        assert expected in output
+
+
+class TestRegistryOutput:
+    """Prometheus registry output."""
+
+    def test_returns_string(self) -> None:
+        """Return a string (not bytes)."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert isinstance(output, str)
+
+    def test_contains_help_lines(self) -> None:
+        """Include HELP lines for registered metrics."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert "# HELP owncastsentry_notification_delivery_total" in output
+        assert "# HELP owncastsentry_errors_total" in output
+        assert "# HELP owncastsentry_info" in output
+
+    def test_uses_isolated_registry(self) -> None:
+        """Use a custom registry, not the global default."""
+        service = MetricsService()
+        output = generate_metrics_output(service)
+        assert "python_gc" not in output
+        assert "process_" not in output

tests/test_models.py

@@ -0,0 +1,193 @@
+# 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

@@ -0,0 +1,457 @@
+# 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 the notification service."""
+
+import logging
+import time
+from typing import TYPE_CHECKING
+
+import pytest
+
+from owncastsentry.metrics import MetricsService
+from owncastsentry.notification_service import NotificationService
+from owncastsentry.utils import SECONDS_BETWEEN_NOTIFICATIONS
+from tests.conftest import _StubMatrixClient, generate_metrics_output
+
+if TYPE_CHECKING:
+    from owncastsentry.database import StreamRepository, SubscriptionRepository
+
+
+def _make_service(
+    *,
+    client: _StubMatrixClient,
+    subscription_repo: SubscriptionRepository,
+    metrics: MetricsService | None = None,
+) -> NotificationService:
+    """Build a NotificationService with a stub client and real repo."""
+    return NotificationService(
+        client=client,
+        subscription_repo=subscription_repo,
+        logger=logging.getLogger("test"),
+        metrics=metrics or MetricsService(),
+    )
+
+
+class TestCanNotify:
+    """Rate-limiting logic for notification cooldowns."""
+
+    def test_first_notification_allowed(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Allow the first notification for an unseen domain."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        assert service._can_notify("example.com") is True
+
+    def test_within_cooldown_blocked(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Block notifications within the cooldown window."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        service.notification_timers_cache["example.com"] = time.monotonic()
+        assert service._can_notify("example.com") is False
+
+    def test_after_cooldown_allowed(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Allow notifications after the cooldown window expires."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        # Subtract an extra second to ensure the cooldown has fully elapsed
+        service.notification_timers_cache["example.com"] = (
+            time.monotonic() - SECONDS_BETWEEN_NOTIFICATIONS - 1
+        )
+        assert service._can_notify("example.com") is True
+
+
+class TestGetLastNotificationTime:
+    """Last notification timestamp retrieval."""
+
+    def test_returns_cached_value(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return the cached timestamp for a known domain."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        service.notification_timers_cache["example.com"] = 12345.0
+        assert service.get_last_notification_time("example.com") == 12345.0
+
+    def test_returns_zero_for_unknown(
+        self, subscription_repo: SubscriptionRepository
+    ) -> None:
+        """Return 0 for a domain that has never been notified."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        assert service.get_last_notification_time("unknown.com") == 0
+
+
+class TestFormatMessage:
+    """Notification message formatting."""
+
+    @pytest.mark.parametrize(
+        ("name", "title", "domain", "tags", "title_change", "expected"),
+        [
+            pytest.param(
+                "My Stream",
+                "Playing Games",
+                "example.com",
+                [],
+                False,
+                "🎥 My Stream is now live!\n"
+                "Stream Title: Playing Games\n"
+                "\n"
+                "To tune in, visit: https://example.com/",
+                id="go-live-with-title",
+            ),
+            pytest.param(
+                "My Stream",
+                "New Title",
+                "example.com",
+                [],
+                True,
+                "📝 My Stream has changed its stream title!\n"
+                "Stream Title: New Title\n"
+                "\n"
+                "To tune in, visit: https://example.com/",
+                id="title-change",
+            ),
+            pytest.param(
+                "My Stream",
+                "",
+                "example.com",
+                [],
+                False,
+                "🎥 My Stream is now live!\n\nTo tune in, visit: https://example.com/",
+                id="go-live-no-title",
+            ),
+            pytest.param(
+                "",
+                "Title",
+                "example.com",
+                [],
+                False,
+                "🎥 example.com is now live!\n"
+                "Stream Title: Title\n"
+                "\n"
+                "To tune in, visit: https://example.com/",
+                id="name-fallback-to-domain",
+            ),
+            pytest.param(
+                "Stream",
+                "Title",
+                "example.com",
+                ["gaming", "fun"],
+                False,
+                "🎥 Stream is now live!\n"
+                "Stream Title: Title\n"
+                "\n"
+                "To tune in, visit: https://example.com/\n"
+                "\n"
+                "#gaming #fun",
+                id="with-tags",
+            ),
+            pytest.param(
+                "Stream",
+                "Title",
+                "example.com",
+                [".hidden", "visible"],
+                False,
+                "🎥 Stream is now live!\n"
+                "Stream Title: Title\n"
+                "\n"
+                "To tune in, visit: https://example.com/\n"
+                "\n"
+                "#visible",
+                id="dot-prefix-tag-filtered",
+            ),
+            pytest.param(
+                "Stream",
+                "Title",
+                "example.com",
+                [".secret"],
+                False,
+                "🎥 Stream is now live!\n"
+                "Stream Title: Title\n"
+                "\n"
+                "To tune in, visit: https://example.com/",
+                id="all-tags-dot-prefixed",
+            ),
+        ],
+    )
+    def test_format_message(
+        self,
+        name: str,
+        title: str,
+        domain: str,
+        tags: list[str],
+        title_change: bool,
+        expected: str,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Format the notification message with expected content."""
+        service = _make_service(
+            client=_StubMatrixClient(), subscription_repo=subscription_repo
+        )
+        result = service._format_message(name, title, domain, tags, title_change)
+        assert result == expected
+
+
+class TestNotifyStreamLive:
+    """End-to-end notification sending."""
+
+    async def test_sends_to_all_subscribed_rooms(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Send notifications to every room subscribed to the domain."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room1:matrix.org")
+        await subscription_repo.add("example.com", "!room2:matrix.org")
+
+        await service.notify_stream_live("example.com", "Stream", "Title", ["tag"])
+
+        assert len(client.sent_messages) == 2
+        room_ids = {msg.room_id for msg in client.sent_messages}
+        assert room_ids == {"!room1:matrix.org", "!room2:matrix.org"}
+        expected_body = (
+            "🎥 Stream is now live!\n"
+            "Stream Title: Title\n"
+            "\n"
+            "To tune in, visit: https://example.com/\n"
+            "\n"
+            "#tag"
+        )
+        for msg in client.sent_messages:
+            assert msg.content.body == expected_body
+
+    async def test_skips_when_rate_limited(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Skip sending when the domain is within the rate-limit cooldown."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+        service.notification_timers_cache["example.com"] = time.monotonic()
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room1:matrix.org")
+
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert len(client.sent_messages) == 0
+
+    async def test_counts_failures(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Send to remaining rooms after a delivery failure."""
+        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 subscription_repo.add("example.com", "!good:matrix.org")
+
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+
+        assert len(client.sent_messages) == 1
+        assert client.sent_messages[0].room_id == "!good:matrix.org"
+        assert client.sent_messages[0].content.body == (
+            "🎥 Stream is now live!\n"
+            "Stream Title: Title\n"
+            "\n"
+            "To tune in, visit: https://example.com/"
+        )
+
+
+class TestSendCleanupWarning:
+    """Cleanup warning notification sending."""
+
+    async def test_sends_warning_to_all_rooms(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Send cleanup warning to all subscribed rooms."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room1:matrix.org")
+
+        await service.send_cleanup_warning("example.com")
+
+        assert len(client.sent_messages) == 1
+        assert client.sent_messages[0].content.body == (
+            "⚠️  Warning: Subscription Cleanup Scheduled\n"
+            "\n"
+            "The Owncast instance at example.com has been "
+            "unreachable for 83 days. If it remains "
+            "unreachable for 7 more days "
+            "(90 days total), this subscription "
+            "will be automatically removed."
+        )
+
+
+class TestSendCleanupDeletion:
+    """Cleanup deletion notification sending."""
+
+    async def test_sends_deletion_to_all_rooms(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Send cleanup deletion notice to all subscribed rooms."""
+        client = _StubMatrixClient()
+        service = _make_service(client=client, subscription_repo=subscription_repo)
+
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room1:matrix.org")
+
+        await service.send_cleanup_deletion("example.com")
+
+        assert len(client.sent_messages) == 1
+        assert client.sent_messages[0].content.body == (
+            "🗑️  Subscription Automatically Removed\n"
+            "\n"
+            "The Owncast instance at example.com has been "
+            "unreachable for 90 days and has been "
+            "automatically removed from subscriptions in this "
+            "room.\n"
+            "\n"
+            "If the instance comes online again and you want to "
+            "resubscribe, run `!subscribe example.com`."
+        )
+
+
+class TestNotificationMetrics:
+    """Notification metrics recording."""
+
+    async def test_records_live_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a live notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="live"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_title_change_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a title_change notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live(
+            "example.com", "Stream", "Title", [], title_change=True
+        )
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="title_change"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_cleanup_warning_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a cleanup_warning notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.send_cleanup_warning("example.com")
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="cleanup_warning"} 1.0'
+        )
+        assert expected in output
+
+    async def test_records_cleanup_deletion_notification(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Record a cleanup_deletion notification metric."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.send_cleanup_deletion("example.com")
+        output = generate_metrics_output(metrics)
+        expected = (
+            "owncastsentry_notification_delivery_total"
+            '{result="success",type="cleanup_deletion"} 1.0'
+        )
+        assert expected in output
+
+    async def test_no_metric_when_rate_limited(
+        self,
+        stream_repo: StreamRepository,
+        subscription_repo: SubscriptionRepository,
+    ) -> None:
+        """Do not record metric when notification is rate-limited."""
+        client = _StubMatrixClient()
+        metrics = MetricsService()
+        service = _make_service(
+            client=client, subscription_repo=subscription_repo, metrics=metrics
+        )
+        service.notification_timers_cache["example.com"] = time.monotonic()
+        await stream_repo.create("example.com")
+        await subscription_repo.add("example.com", "!room:matrix.org")
+        await service.notify_stream_live("example.com", "Stream", "Title", [])
+        output = generate_metrics_output(metrics)
+        assert 'result="success",type="live"} 0.0' in output

tests/test_owncast_client.py

@@ -0,0 +1,280 @@
+# 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 the Owncast HTTP client."""
+
+import json
+import logging
+from typing import TYPE_CHECKING
+
+import pytest
+from aioresponses import aioresponses
+
+from owncastsentry.metrics import MetricsService
+from owncastsentry.owncast_client import OwncastClient
+from tests.conftest import (
+    VALID_CONFIG_RESPONSE,
+    VALID_STATUS_RESPONSE,
+    generate_metrics_output,
+)
+
+if TYPE_CHECKING:
+    from collections.abc import AsyncIterator
+
+
+@pytest.fixture
+async def owncast_client() -> AsyncIterator[OwncastClient]:
+    """Create an OwncastClient and close it after the test."""
+    client = OwncastClient(
+        logger=logging.getLogger("test"),
+        version="0.0.0",
+        metrics=MetricsService(),
+    )
+    yield client
+    await client.close()
+
+
+class TestGetStreamState:
+    """Stream state retrieval from the status API."""
+
+    async def test_returns_state_on_success(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return a StreamState with correct fields on a valid 200 response."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is not None
+        assert result.domain == "stream.logal.dev"
+        assert (
+            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.last_disconnect_time == "2026-03-04T21:05:32-05:00"
+
+    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}
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=json.dumps(incomplete).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:
+        """Return None when the response body is not valid JSON."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                body=b"not json",
+            )
+            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:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                status=404,
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is None
+
+    async def test_returns_none_on_connection_error(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when a connection error occurs."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/status",
+                exception=ConnectionError(),
+            )
+            result = await owncast_client.get_stream_state("stream.logal.dev")
+
+        assert result is None
+
+
+class TestGetStreamConfig:
+    """Stream configuration retrieval from the config API."""
+
+    async def test_returns_config_on_success(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return a StreamConfig with correct fields on a valid 200 response."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                body=json.dumps(VALID_CONFIG_RESPONSE).encode(),
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is not None
+        assert result.name == "LogalDeveloper's Live Stream"
+        assert result.tags == [
+            "video games",
+            "chatting",
+            "casual",
+            "english",
+            "streaming",
+            "owncast",
+            "variety",
+        ]
+
+    async def test_returns_none_on_invalid_json(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when the response body is not valid JSON."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                body=b"not json",
+            )
+            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:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                status=500,
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is None
+
+    async def test_returns_none_on_connection_error(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return None when a connection error occurs."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://stream.logal.dev/api/config",
+                exception=ConnectionError(),
+            )
+            result = await owncast_client.get_stream_config("stream.logal.dev")
+
+        assert result is None
+
+
+class TestValidateInstance:
+    """Owncast instance validation via the status API."""
+
+    async def test_returns_true_for_valid_instance(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return True when the status endpoint returns a valid response."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://valid.com/api/status",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            result = await owncast_client.validate_instance("valid.com")
+
+        assert result is True
+
+    async def test_returns_false_for_invalid_instance(
+        self, owncast_client: OwncastClient
+    ) -> None:
+        """Return False when the status endpoint returns a non-200 response."""
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://invalid.com/api/status",
+                status=404,
+            )
+            result = await owncast_client.validate_instance("invalid.com")
+
+        assert result is False
+
+
+class TestResponseTimeMetrics:
+    """Response time histogram recording."""
+
+    async def test_records_on_success(self) -> None:
+        """Record response time on a successful request."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                body=json.dumps(VALID_STATUS_RESPONSE).encode(),
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' in output
+        await client.close()
+
+    async def test_no_observation_on_failure(self) -> None:
+        """Do not record response time when request fails."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                status=500,
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+        await client.close()
+
+    async def test_no_observation_on_connection_error(self) -> None:
+        """Do not record response time on connection error."""
+        metrics = MetricsService()
+        client = OwncastClient(
+            logger=logging.getLogger("test"),
+            version="0.0.0",
+            metrics=metrics,
+        )
+        with aioresponses() as mocked:
+            mocked.get(
+                "https://example.com/api/status",
+                exception=ConnectionError(),
+            )
+            await client.get_stream_state("example.com")
+        output = generate_metrics_output(metrics)
+        assert 'owncastsentry_api_response_seconds{domain="example.com"}' not in output
+        await client.close()
+
+
+class TestOpenConnectionCount:
+    """Open connection count."""
+
+    async def test_zero_with_no_requests(self, owncast_client: OwncastClient) -> None:
+        """Return zero when no requests have been made."""
+        assert owncast_client.open_connection_count == 0

tests/test_utils.py

@@ -0,0 +1,197 @@
+# 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("") == ""