CREATE TABLE IF NOT EXISTS creator_work_source (
    work_id text NOT NULL REFERENCES creator_work(id) ON DELETE CASCADE,
    platform text NOT NULL CHECK (platform IN ('douyin', 'xiaohongshu')),
    source_type text NOT NULL CHECK (source_type IN ('owned', 'competitor')),
    source_id text NOT NULL,
    created_at timestamptz NOT NULL DEFAULT now(),
    PRIMARY KEY (work_id, source_type, source_id)
);
CREATE INDEX IF NOT EXISTS creator_work_source_lookup_idx
    ON creator_work_source (platform, source_type, source_id, work_id);

INSERT INTO creator_work_source (work_id, platform, source_type, source_id)
SELECT id, platform, source_type, source_id
FROM creator_work
ON CONFLICT (work_id, source_type, source_id) DO NOTHING;