Desacoblar playlists de sessions i afegir slow jams

folkugat_web/dal/sql/playlists/ddl.py

@@ -4,15 +4,29 @@ from folkugat_web.dal.sql import Connection, get_connection
 def create_db(con: Connection | None = None):
     with get_connection(con) as con:
         create_playlists_table(con)
+        create_playlist_entries_table(con)
 
 
 def create_playlists_table(con: Connection):
     query = """
       CREATE TABLE IF NOT EXISTS playlists (
         id INTEGER PRIMARY KEY,
-        session_id INTEGER NOT NULL,
-        set_id INTEGER NOT NULL,
-        tema_id INTEGER
+        name TEXT
+    )
+    """
+    cur = con.cursor()
+    _ = cur.execute(query)
+
+
+def create_playlist_entries_table(con: Connection):
+    query = """
+      CREATE TABLE IF NOT EXISTS playlist_entries (
+        id INTEGER PRIMARY KEY,
+        playlist_id INTEGER NOT NULL,
+        set_id INTEGER NOT NULL,
+        tema_id INTEGER,
+        FOREIGN KEY (playlist_id) REFERENCES playlists(id) ON DELETE CASCADE,
+        FOREIGN KEY (tema_id) REFERENCES temes(id) ON DELETE CASCADE
     )
     """
     cur = con.cursor()