CREATE TABLE IF NOT EXISTS asset_hashes (
  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
  asset_id uuid NOT NULL REFERENCES assets(id) ON DELETE CASCADE,
  bucket text NOT NULL,
  sha256 text NOT NULL,
  created_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS asset_hashes_asset_id_idx ON asset_hashes(asset_id);

CREATE UNIQUE INDEX IF NOT EXISTS asset_hashes_bucket_sha256_idx
ON asset_hashes(bucket, sha256) WHERE sha256 IS NOT NULL;