Troubleshoot misskey follows

Store the original follow request object and use it for approvals.
Closes #1690

core/data/data.go

@@ -17,7 +17,7 @@ import (
 )
 
 const (
-	schemaVersion = 3
+	schemaVersion = 4
 )
 
 var (
@@ -139,6 +139,8 @@ func migrateDatabase(db *sql.DB, from, to int) error {
 			migrateToSchema2(db)
 		case 2:
 			migrateToSchema3(db)
+		case 3:
+			migrateToSchema4(db)
 		default:
 			log.Fatalln("missing database migration step")
 		}

core/data/migrations.go

@@ -9,6 +9,18 @@ import (
 	"github.com/teris-io/shortid"
 )
 
+func migrateToSchema4(db *sql.DB) {
+	stmt, err := db.Prepare("ALTER TABLE ap_followers ADD COLUMN request_object BLOB")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer stmt.Close()
+	_, err = stmt.Exec()
+	if err != nil {
+		log.Warnln(err)
+	}
+}
+
 func migrateToSchema3(db *sql.DB) {
 	// Since it's just a backlog of chat messages let's wipe the old messages
 	// and recreate the table.