CREATE TABLE IF NOT EXISTS concert_diary_photos (
    id SERIAL PRIMARY KEY,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    concert_id INTEGER NOT NULL REFERENCES concerts(id) ON DELETE CASCADE,
    path TEXT NOT NULL UNIQUE,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_concert_diary_photos_entry
ON concert_diary_photos(user_id, concert_id, created_at);

INSERT INTO concert_diary_photos (user_id, concert_id, path)
SELECT user_id, concert_id, photo_path
FROM concert_diary
WHERE photo_path IS NOT NULL
ON CONFLICT (path) DO NOTHING;