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feat(entity): batching reads — coalescing, JIT preload, preload() - #65
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…n (…)` - new coalesce.ts: the point lookups a request issues in one microtask become one statement, keyed by ctx identity (a WeakMap, so the batch dies with the request). findById keeps its signature, so the fix reaches code already written and there is nothing to opt into - the scope key covers every input to the statement except the id, so two tenants, two soft-delete visibilities, two projections, two entities or two clients never share one: the coalesced statement has to be one each single lookup would have been served by - it declines rather than guesses — no request in scope (a job, a script), a composite primary key, a scope value it cannot render — and declining is exactly the statement findById always sent - a uuid is filed lower-cased, because Postgres matches one as a value: an id handed in upper case must not depend on who shared the microtask - a row that no longer decodes fails its own caller, not the batch; past 500 ids the batch becomes whole statements, never one Postgres refuses for its bind count - the window closes before the statement goes out, so a lookup arriving mid-flight opens the next batch instead of joining ids on the wire - 16 tests, 7 of them red without the wiring, plus a live case: five lookups, one statement, the same five answers from a real Postgres Co-Authored-By: Claude <noreply@anthropic.com>
- `findMany` leaves its page's foreign key values behind for the request; the first `findById` for any of them resolves that key for every row of the page in one `where "id" in (…)`, and the rest of the loop is memory. A `for … of` awaits between iterations, so the microtask coalescer can never see two of its lookups — only the page can batch them. - The scope guard is a security boundary: a preloaded row is served only under the same scope key (tenant predicate, soft-delete visibility, projection, entity), the same client, and no write to that entity since. The preload statement is that scope widened to the page's ids, so a page's ids can never resolve rows outside the reader's own scope. - `writing()` in `postgresRepo` is the one place a write drops what the request preloaded, before the statement goes out. - `batch-read.ts` extracted so the coalescer and the preload share one scope key, one `keyOf` and one `in` statement. Co-Authored-By: Claude <noreply@anthropic.com>
- `ReadBuilder.preload('<relation>')`: one extra `where <key> in (…)` per
relation over the page's key values, attached under the relation's name —
the eager third of the batching family, and the line an N+1 fix names
- the relation is the `references()` already declared; an unknown name is
`X_PRELOAD_UNKNOWN_RELATION` on the chain, not one page later
- `belongsTo` attaches the row or null, `hasMany` an array, always present;
relations resolve concurrently, a name given twice is one statement
- tenancy is carried, never guessed: the page's own tenant predicate reaches
the related read only across a same-named tenant column, else the related
read's own `assertScoped` refuses it
- `select()` is widened with the key a preload reads, so a projection can drop
neither that key nor the relation; attachment copies the row
- reach is the `database()` set, through its driver — memory and Postgres mean
the same thing; outside it, `X_INVARIANT_VIOLATED` naming the call that fixes it
Co-Authored-By: Claude <noreply@anthropic.com>
- Add `db.jitPreload: boolean` to DatabaseConfig (default true) - Wire through PostgresDriverOptions to gate tagSiblings in findMany - Enables app to disable JIT preload if needed (axiom 1: one way per thing) - Tests verify both enabled and disabled paths work correctly Co-Authored-By: Claude <noreply@anthropic.com>
- pg-driver.live.test.ts already proved N concurrent findById -> one coalesced `in` statement; add the sequential-loop-over-findMany case (a `for … of` loop over a page of invoiceTags resolves the invoices it points at in exactly two statements total, not one per row) so the JIT-preload half of the same claim is proved live, not only against a recording client. - cross-tenant non-coalescing and soft-delete-filter preservation were already pinned at the unit level (coalesce.test.ts, jit-preload.test.ts) and, for soft-delete, inside the existing live coalescing test. Co-Authored-By: Claude <noreply@anthropic.com>
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Inline comments:
In `@packages/entity/README.md`:
- Around line 188-209: Update each newly added load-bearing API behavior section
in the README, including the “Preloading a relation” section and the section
covering the other referenced lines, to include “As of 2026-07” in the heading
or introductory text. Preserve the documented behavior and wording otherwise.
In `@packages/entity/src/coalesce.test.ts`:
- Around line 1-13: Add a 1–4 line header comment at the top of the coalesce
test module, before the imports, stating its single responsibility and why that
responsibility matters, consistent with the sibling test files.
In `@packages/entity/src/jit-preload.test.ts`:
- Around line 127-137: Align the test title with the row count created in the
test body: update the “a hundred rows” wording in the test declaration around
authorsOfThePage to match the 40 rows generated by Array.from, without changing
the test behavior.
- Around line 259-273: Clarify the final assertion in the test around a write
followed by a read: either add a concise explanation that the existing page stub
still returns the pre-update name, or change the re-read stub to a distinct
post-read value so the assertion demonstrates invalidation. Keep the
statement-count and SQL assertions unchanged.
In `@packages/entity/src/pg-driver.live.test.ts`:
- Around line 304-320: Update the statement observer in the test around
runWithContext to retain only statements targeting the tags and pg_live_invoices
tables, excluding incidental pool or transaction statements. Replace positional
assertions on statements[1] with table-aware lookup or assertions, while
preserving verification of the single batched “id” in ($1, $2, $3) query.
In `@packages/entity/src/pg-driver.test.ts`:
- Around line 309-332: Rewrite the jitPreload tests in the postgresRepo()
configuration suite to execute findMany and the subsequent findById inside a
request context using createContext and runWithContext from `@ultimat3/core`.
Assert the enabled path issues one widened IN query for the sibling preload,
while the disabled path issues a plain id equality query, and verify statement
counts or query text so the tests fail when jitPreload or sibling tagging is
ignored.
In `@packages/entity/src/pg-driver.ts`:
- Around line 44-49: Pass DatabaseConfig.jitPreload through the postgresDriver()
construction path into PostgresDriverOptions, preserving the configured false
value instead of always applying the enabled default. Update the relevant
configuration wiring in packages/core/src/config.ts and the driver
initialization while keeping the existing default for unspecified settings.
In `@packages/entity/src/preload.ts`:
- Around line 38-43: Update the unreachable function’s fix field to use an
existing runnable x CLI command with its --json option, rather than the
TypeScript database expression; keep the command self-contained without
undefined references such as driver, and preserve any relation-specific guidance
in cause.
- Around line 52-57: Update tenantScope to accept the source EntityCore
alongside the target, and carry an equality predicate only when both entities
have the same non-null $tenantColumn. Update its callers accordingly so
mismatched tenant columns return no scope and preserve the X_TENANCY_UNSCOPED
guard.
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CHANGELOG.mddocs/architecture/06-data-layer.mdpackages/core/src/config.test.tspackages/core/src/config.tspackages/entity/CLAUDE.mdpackages/entity/README.mdpackages/entity/src/batch-read.tspackages/entity/src/coalesce.test.tspackages/entity/src/coalesce.tspackages/entity/src/database.tspackages/entity/src/index.tspackages/entity/src/jit-preload.test.tspackages/entity/src/jit-preload.tspackages/entity/src/pg-driver.live.test.tspackages/entity/src/pg-driver.test.tspackages/entity/src/pg-driver.tspackages/entity/src/preload-statements.test.tspackages/entity/src/preload.test.tspackages/entity/src/preload.tspackages/entity/src/query.tswiki/Entities-And-Migrations.mdwiki/Queries-And-Live-Queries.md
Addresses PR #65 review. - preload.ts: `tenantScope()` checks BOTH ends. A source scoped by `workspaceId` carrying an ordinary `orgId` predicate no longer supplies the target's tenant scope — the related read builds an unscoped plan and `assertScoped` refuses it as `X_TENANCY_UNSCOPED`, as documented. - preload.ts: `unreachable()`'s fix is a runnable `x entities list --json` ahead of the `database()` edit that repairs it. - pg-driver.test.ts: the two `jitPreload` tests ran outside a request, so `tagSiblings` returned early in both and neither could fail. They now run a page and the sequential loop after it inside a request and count statements: enabled 2, disabled 3. - core config: `database.jitPreload` is gone. Nothing reads config at the seam that builds a repository, so the key was inert; `postgresDriver({ jitPreload: false })` is the one switch. - tests: header comment on coalesce.test.ts, a title that names the row count it builds, the why behind the pre-update name, and the live observer filtered to the two tables under test. - docs: CHANGELOG, entity README/CLAUDE.md, data-layer and wiki follow. Co-Authored-By: Claude <noreply@anthropic.com>
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This was referenced Aug 13, 2026
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Summary
findByIdcalls into onewhere id in (…)per request (coalesce.ts).findManytags its page's FK values so a sequentialfor … ofloop resolves in one extra statement instead of one per row (jit-preload.ts, sharedbatch-read.ts).ReadBuilder.preload('<relation>')— the declarative, opt-in form the N+1 detector'sfix:line names (preload.ts).db: { jitPreload: boolean }config switch, defaulttrue.findById→ one statement, and now a sequential loop over afindManypage → exactly two statements total — both against a real server, not only a recording client. Cross-tenant non-coalescing and soft-delete-filter preservation are pinned at the unit level and inside the live coalescing test.Test plan
bun test packages/entity— 263 pass, 25 skip, 0 failTEST_DATABASE_URL=… bun test packages/entity/src/pg-driver.live.test.ts— 13 pass, 0 failbun run verify— 12/17 green (5 honest skips: job, eval, drift, contract-diff, budgets)Need help on this PR? Tag
@codesmith-botwith what you need. Autofix is disabled.Summary by CodeRabbit
findByIdlookups, reducing redundant database queries.preload()support for loadingbelongsToandhasManyrelations on query results.