link playlists to a userid

+ fix favorites foreign key
+ add migration to add userid foreign key to playlists table

app/migrations/v1_4_9/__init__.py

@@ -83,15 +83,79 @@ class _4AddUserIdToFavoritesTable(Migration):
     @staticmethod
     def migrate():
         # check if userid column exists
-        exists_sql = "select count(*) from pragma_table_info('favorites') where name = 'userid'"
-        sql = "ALTER TABLE favorites ADD userid INTEGER NOT NULL DEFAULT 1 REFERENCES users(id) ON DELETE CASCADE"
+        exists_sql = (
+            "select count(*) from pragma_table_info('favorites') where name = 'userid'"
+        )
+        sql = """
+        ALTER TABLE favorites ADD userid INTEGER NOT NULL DEFAULT 1;
+        ALTER TABLE favorites RENAME TO _favorites;
+
+        CREATE TABLE IF NOT EXISTS favorites (
+            id integer PRIMARY KEY,
+            hash text not null,
+            type text not null,
+            timestamp integer not null default 0,
+            userid integer not null,
+            constraint fk_users foreign key (userid) references users(id) on delete cascade
+        );
+
+        INSERT INTO favorites SELECT * FROM _favorites;
+        DROP TABLE _favorites;
+        """
 
         with SQLiteManager(userdata_db=True) as cur:
             data = cur.execute(exists_sql)
             data = data.fetchone()
 
             if data[0] == 1:
-                return# INFO: column already exists
+                return # INFO: column already exists
 
             cur.executescript(sql)
- 
+
+
+class _5AddUserIdToPlaylistsTable(Migration):
+    """
+    Adds a userid column to the playlists table.
+    """
+
+    @staticmethod
+    def migrate():
+        # check if userid column exists
+        exists_sql = (
+            "select count(*) from pragma_table_info('playlists') where name = 'userid'"
+        )
+
+        # Add the userid column to the playlists table
+        # Rename the old table to _playlists
+        # Create a new playlists table with the userid column
+        # Then, copy the data from the old table to the new table
+        # Finally, drop the old table
+        sql = """
+        ALTER TABLE playlists ADD userid INTEGER NOT NULL DEFAULT 1;
+        ALTER TABLE playlists RENAME TO _playlists;
+        CREATE TABLE IF NOT EXISTS playlists (
+            id integer PRIMARY KEY,
+            image text,
+            last_updated text not null,
+            name text not null,
+            settings text,
+            trackhashes text,
+            userid integer not null,
+            constraint fk_users foreign key (userid) references users(id) on delete cascade
+        );
+
+        INSERT INTO playlists SELECT * FROM _playlists;
+        DROP TABLE _playlists;
+        """
+
+        with SQLiteManager(userdata_db=True) as cur:
+            # INFO: Check if the column already exists
+            data = cur.execute(exists_sql)
+            data = data.fetchone()
+
+            # INFO: If the column already exists, return
+            if data[0] == 1:
+                return  # INFO: column already exists
+
+            # INFO: Execute the sql
+            cur.executescript(sql)