fix(mediadb): stop the browse sort migration rebuilding the index at startup - #1371
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…startup The migration existed only to move the schema version, so a build without ZAPAROO_TITLE_V1 raises ErrSchemaAhead and rebuilds instead of failing on the first prepare against Media. Rebuilding the index there as well ran it over every media row while the service was starting, with nothing on screen to say why: 2m14s on a 229k-item library on MiSTer SD, and libraries get much bigger. The version bump is the whole job. Replacing the index stays in CreateSecondaryIndexes, at the end of an indexing run, where the cost is expected. Until that run the index is the uncollated one, which is safe: browse ordering comes from the collation written into the queries, and INDEXED BY still plans against it.
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📝 WalkthroughWalkthroughThe migration now records the browse sort collation without rebuilding the index. ChangesBrowse sort collation migration
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The migration now defers the browse index rebuild until indexing, avoiding a long startup pause, but its rollback path removes the compatibility marker without restoring the index definition expected by older builds. A rollback performed in that state could prevent the older version from opening the media database, so merge should wait for a compatible downgrade path or explicit owner acceptance. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Timed both migration bodies against a locally generated 229,617-row media database, the same size as the #1279 device:
The index rebuild is roughly 680x slower on the device. A desktop measurement would have shown 198ms and looked completely harmless, which is how this reached main in the first place — the cost is only visible on the target storage. |
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In `@pkg/database/mediadb/migrations/20260830140000_browse_sort_collation.sql`:
- Line 28: Update the downgrade migration around the BrowseSortCollation cleanup
to recreate idx_media_browse_sort without the ZAPAROO_TITLE_V1 collation before
deleting the BrowseSortCollation compatibility marker. Add a regression test
covering downgrade and preparation of Media statements with the legacy
uncollated index.
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The migration added in #1356 exists only to move the schema version, so a build without
ZAPAROO_TITLE_V1raisesErrSchemaAheadand rebuilds the media database instead of failing on the first prepare againstMedia.It also rebuilt
idx_media_browse_sort, which ran over every media row while the service was starting, with nothing on screen to say why. Measured on a 229k-item library on MiSTer SD: 2m14s of frozen startup (20:04:18 → 20:06:32). Libraries get considerably larger than that.The version bump is the whole job. Replacing the index stays in
CreateSecondaryIndexes, at the end of an indexing run, where a large index build is expected — which is where #1356 originally put it.The interim is safe
Between upgrade and the next index run the index is the uncollated one. Verified that browse still works against it:
INDEXED BY idx_media_browse_sortstill plans — the index exists either way, created by20260609120000_media_sortname.ORDER BY … COLLATE ZAPAROO_TITLE_V1still runs, and ordering stays correct because the collation is written into the queries. Only the index-ordered sort is lost until the next index run.Test
TestMigrations_BrowseSortCollationBumpsVersionWithoutTableWorkpins both halves: the migration applies its marker and leaves the index uncollated, andCreateSecondaryIndexesthen replaces it with the collated form.Note
Nothing reports progress while a migration runs — startup logged "opening databases" and went silent for over two minutes. That is a general gap, not specific to this migration, and worth addressing separately.
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