ALTER TABLE music_sessions_history ADD PRIMARY KEY (id); CREATE TABLE feeds ( id VARCHAR(64) PRIMARY KEY DEFAULT uuid_generate_v4(), claimed_recording_id VARCHAR(64) UNIQUE REFERENCES claimed_recordings(id) ON DELETE CASCADE, music_session_id VARCHAR(64) UNIQUE REFERENCES music_sessions_history(id) ON DELETE CASCADE, created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP );