photoprism/internal/migrate/sqlite3/20220329-082000.sql

UPDATE files SET media_id = CASE WHEN file_missing = 0 AND deleted_at IS NULL THEN (HEX(100000000000 - photo_id) || '-' || (1 + file_sidecar - file_primary) || '-' || file_uid) ELSE NULL END WHERE photo_id IS NOT NULL;