CREATE TABLE IF NOT EXISTS creator_collection_checkpoint (
    id text PRIMARY KEY,
    source_type text NOT NULL CHECK (source_type IN ('owned', 'competitor')),
    source_id text NOT NULL,
    collection_kind text NOT NULL CHECK (
        collection_kind IN ('works', 'comments')
    ),
    cursor text NOT NULL DEFAULT '',
    window_start timestamptz NOT NULL,
    window_end timestamptz NOT NULL,
    status text NOT NULL DEFAULT 'idle' CHECK (
        status IN ('idle', 'running', 'succeeded', 'failed', 'blocked')
    ),
    lease_until timestamptz,
    last_started_at timestamptz,
    last_completed_at timestamptz,
    last_error text NOT NULL DEFAULT '',
    UNIQUE (source_type, source_id, collection_kind)
);
CREATE INDEX IF NOT EXISTS creator_collection_due_idx ON creator_collection_checkpoint (
    status, lease_until, last_completed_at
);