-- HLS VOD playback: per-asset HLS rendition (fMP4) generated by the proxy
-- worker alongside the MP4 proxy. Presence of hls_s3_key means an HLS
-- playlist exists at hls/<asset_id>/playlist.m3u8 and /assets/:id/stream
-- should prefer it (type: 'hls') over the MP4 range-stitched /video path.
ALTER TABLE assets ADD COLUMN IF NOT EXISTS hls_s3_key TEXT;
