Refactor: Cache manifest and init data to reduce cold-start queries#378
Open
gruntlord5 wants to merge 5 commits intoemdash-cms:mainfrom
Open
Refactor: Cache manifest and init data to reduce cold-start queries#378gruntlord5 wants to merge 5 commits intoemdash-cms:mainfrom
gruntlord5 wants to merge 5 commits intoemdash-cms:mainfrom
Conversation
Cold starts currently run ~20 database queries before the first page can render (FTS verify, 32+ migration checks, 3 sequential site info queries, N+1 manifest rebuild). Most of this produces the same result every time and only needs to rerun when an admin changes something. This commit reduces cold-start queries from ~20 to ~2: 1. **Manifest caching**: getManifest() now checks an in-memory cache, then a DB-persisted cache (1 query), before falling back to the full N+1 rebuild. invalidateManifest() clears both caches and is already called from the MCP server on schema/plugin changes. 2. **Init data caching**: Plugin states + site info are cached together in a single options row. On cold start, 1 query replaces 2-4. Site info uses getMany() (batch WHERE IN) instead of 3 sequential get() calls even on cache miss. 3. **Lazy migration wrapper**: New wrapWithLazyMigrations() dialect wrapper defers migration checks until the first schema error. On established sites the schema is stable, so checking 30+ migrations on every cold start is pure overhead. Fresh installs and upgrades are handled automatically when the first query hits "no such table". Applied to all built-in adapters (SQLite, libSQL, PostgreSQL, D1). Third-party dialects that don't use the wrapper still get eager migrations as a fallback. 4. **Skip FTS verify on init**: FTS corruption is rare; checking every cold start adds latency without benefit on stable sites.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Cold starts currently run ~20 database queries before the first page can render (FTS verify, 32+ migration checks, 3 sequential site info queries, N+1 manifest rebuild). Most of this produces the same result every time and only needs to rerun when an admin changes something. This commit reduces cold-start queries from ~20 to ~2: 1. **Manifest caching**: getManifest() now checks an in-memory cache, then a DB-persisted cache (1 query), before falling back to the full N+1 rebuild. invalidateManifest() clears both caches and is already called from the MCP server on schema/plugin changes. 2. **Init data caching**: Plugin states + site info are cached together in a single options row. On cold start, 1 query replaces 2-4. Site info uses getMany() (batch WHERE IN) instead of 3 sequential get() calls even on cache miss. 3. **Lazy migration wrapper**: New wrapWithLazyMigrations() dialect wrapper defers migration checks until the first schema error. On established sites the schema is stable, so checking 30+ migrations on every cold start is pure overhead. Fresh installs and upgrades are handled automatically when the first query hits "no such table". Applied to all built-in adapters (SQLite, libSQL, PostgreSQL, D1). Third-party dialects that don't use the wrapper still get eager migrations as a fallback. 4. **Skip FTS verify on init**: FTS corruption is rare; checking every cold start adds latency without benefit on stable sites.
…d5/emdash into perf/cold-start-caching
🦋 Changeset detectedLatest commit: ebbdf34 The changes in this PR will be included in the next version bump. This PR includes changesets to release 9 packages
Not sure what this means? Click here to learn what changesets are. Click here if you're a maintainer who wants to add another changeset to this PR |
Contributor
|
All contributors have signed the CLA ✍️ ✅ |
Author
|
I have read the CLA Document and I hereby sign the CLA |
@emdash-cms/admin
@emdash-cms/auth
@emdash-cms/blocks
@emdash-cms/cloudflare
emdash
create-emdash
@emdash-cms/gutenberg-to-portable-text
@emdash-cms/x402
@emdash-cms/plugin-ai-moderation
@emdash-cms/plugin-atproto
@emdash-cms/plugin-audit-log
@emdash-cms/plugin-color
@emdash-cms/plugin-embeds
@emdash-cms/plugin-forms
@emdash-cms/plugin-webhook-notifier
commit: |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
What does this PR do?
Reduces cold-start database queries from ~20 to ~2 on established sites by caching manifest and init data, deferring migrations to the dialect layer, and skipping FTS verification on init.
Closes #346
Type of change
Changes
Manifest caching
getManifest()checks an in-memory cache, then a DB-persisted cache (1 query), before falling back to the full N+1 schema registry rebuild.invalidateManifest()clears both caches -- it's already called from the MCP server on schema/plugin changes.Init data caching
Plugin states + site info are cached together in a single options row. On cold start, 1 query replaces 2-4. Site info also uses
getMany()(batchWHERE IN) instead of 3 sequentialget()calls on cache miss.Lazy migration dialect wrapper
New
wrapWithLazyMigrations()utility wraps any Kysely dialect to defer migration checks until the first schema error (no such table/does not exist). Applied to all built-in adapters (SQLite, libSQL, PostgreSQL, D1). Third-party dialects that don't use the wrapper still get eager migrations as a fallback.Skip FTS verify on init
FTS corruption is rare; checking every cold start adds latency without benefit on stable sites.
Checklist
pnpm typecheckpasses (pre-existing failures in admin/core unrelated to this PR -- same on main)pnpm --silent lint:json | jq '.diagnostics | length'returns 14 (down from 16 on main -- we removed 2 unused imports)pnpm testpasses (1829 passed, 18 pre-existing failures same on main)pnpm formathas been runAI-generated code disclosure
Screenshots / test output
Build passes for both
emdashand@emdash-cms/cloudflare. Test suite: 1829 tests passed, 18 pre-existing failures (identical to cleanmain). Lint diagnostics reduced from 16 to 14 (removed 2 unused imports from FTS verify removal).