diff --git a/.changeset/service-datasource-vitest-testtimeout.md b/.changeset/service-datasource-vitest-testtimeout.md
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+++ b/.changeset/service-datasource-vitest-testtimeout.md
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+---
+"@objectstack/service-datasource": patch
+---
+
+fix(service-datasource): give this package's vitest run a 60s `testTimeout` — close the #4856 coverage hole that let the merge queue evict unrelated PRs (#6044)
+
+`packages/services/service-datasource` had no `vitest.config.ts` at all, so
+every case ran under vitest's **5000ms** default. #4856 fixed this class of
+flake by setting per-package timeouts in each package's own `vitest.config.ts`
+— a structure that cannot reach a package with no config file to carry it.
+
+The cases that build a REAL driver pay a one-time `@objectstack/driver-sql`
+(knex) import inside the first case that reaches it. In
+`datasource-pool-support.test.ts` the pool rejections throw before that import,
+so "sqlite WITHOUT a pool still builds exactly as before" is the first case
+through it: measured idle it runs ~1.1s while its neighbours run 0-2ms (the
+postgres/mysql cases ride the module cache at 31/82ms). ~4.6x headroom against
+5000ms holds on a PR branch and not on a merge-queue runner building several
+PRs' batches at once — the observed signature: intermittent reds only in queue
+full builds, evicting PRs that never touched this package (#5999 twice, #5973
+once, 2026-08-06).
+
+`testTimeout: 60_000` reuses #4856's value rather than inventing a new number,
+set at the config layer so future cases are covered on arrival. Isolation was
+reviewed rather than assumed (the #6044 triage forbade a timeout-only closure):
+the flaky case builds `:memory:`, unprobed on the production path, never opens
+a connection or loads the native addon, and every factory-door case destroys
+its knex handle; the boot and wizard doors run on per-case fakes. No temp
+files, no ports, no shared mutable state across cases — the red was load
+variance on a real one-time import, not a leak.
+
+No runtime, schema or public API change — test configuration only.
diff --git a/packages/services/service-datasource/vitest.config.ts b/packages/services/service-datasource/vitest.config.ts
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+++ b/packages/services/service-datasource/vitest.config.ts
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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'node',
+    // This package had no vitest config at all, so every case ran under
+    // vitest's 5000ms default — the structural hole #4856 could not cover
+    // (it set per-package timeouts in each package's own vitest.config.ts,
+    // and this package had none). The cases that build a REAL driver pay a
+    // one-time `@objectstack/driver-sql` (knex) import inside the first case
+    // that reaches it: measured idle that case runs ~1.1s
+    // (datasource-pool-support "sqlite WITHOUT a pool"), leaving ~4.6x
+    // headroom that a loaded merge-queue runner eats — the #6044 signature
+    // (green on every PR branch, intermittently red only in queue full
+    // builds). 60s reuses #4856's value rather than inventing a new number,
+    // set at the config layer so future cases are covered on arrival.
+    testTimeout: 60_000,
+  },
+});