SET search_path TO atlas, public;

-- 同一来源商品重新采集时保留 collection_item / product 的稳定 ID，但使用新的
-- 来源快照替换可再采集数据。素材任务携带快照版本，避免旧 Worker 任务回写旧素材。
ALTER TABLE collection_items
    ADD COLUMN source_snapshot_revision BIGINT NOT NULL DEFAULT 1
    CHECK (source_snapshot_revision > 0);

ALTER TABLE collection_asset_transfers
    ADD COLUMN source_snapshot_revision BIGINT NOT NULL DEFAULT 1
    CHECK (source_snapshot_revision > 0);

CREATE INDEX ix_collection_asset_transfers_snapshot_queue
    ON collection_asset_transfers (collection_item_id, source_snapshot_revision, status, created_at);