CREATE TABLE songs ( id SERIAL PRIMARY KEY UNIQUE NOT NULL, title VARCHAR NOT NULL, album_id INTEGER REFERENCES albums(id), track INTEGER, duration INTEGER NOT NULL, release_date DATE, storage_path VARCHAR NOT NULL, image_path VARCHAR ); CREATE TABLE song_artists ( song_id INTEGER REFERENCES songs(id) ON DELETE CASCADE NOT NULL, artist_id INTEGER REFERENCES artists(id) ON DELETE CASCADE NOT NULL, PRIMARY KEY (song_id, artist_id) );