Commit a74ce48f9630e3e672f687c1cb3b38f2187ecf2d | the-knife

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 21 insertions(+), 0 deletions(-)

apps/server/src/persistence/Sqlite.test.ts+15

...	@@ -114,6 +114,21 @@ it.effect("collects planner statistics for an existing database on open", () =>	...	@@ -114,6 +114,21 @@ it.effect("collects planner statistics for an existing database on open", () =>
114	);	114	);
115	});	115	});
116		116
		117	it.effect("only fsyncs the database file at WAL checkpoints", () => {
		118	const tempDir = NodeFS.mkdtempSync(NodePath.join(NodeOS.tmpdir(), "t3-sqlite-sync-"));
		119	const dbPath = NodePath.join(tempDir, "state.sqlite");
		120
		121	return Effect.gen(function* () {
		122	const sql = yield* SqlClient.SqlClient;
		123	const rows = yield* sql<{ readonly synchronous: number }>`PRAGMA synchronous`;
		124	// 1 is NORMAL.
		125	assert.equal(rows[0]?.synchronous, 1);
		126	}).pipe(
		127	Effect.provide(SqlitePersistence.layerFromPath(dbPath).pipe(Layer.provide(NodeServices.layer))),
		128	Effect.ensuring(Effect.sync(() => NodeFS.rmSync(tempDir, { recursive: true, force: true }))),
		129	);
		130	});
		131
117	it.effect("applies busy_timeout in the shared persistence setup", () =>	132	it.effect("applies busy_timeout in the shared persistence setup", () =>
118	Effect.gen(function* () {	133	Effect.gen(function* () {
119	const sql = yield* SqlClient.SqlClient;	134	const sql = yield* SqlClient.SqlClient;

apps/server/src/persistence/Sqlite.ts+6

...	@@ -19,6 +19,12 @@ const layerSetup = Layer.effectDiscard(	...	@@ -19,6 +19,12 @@ const layerSetup = Layer.effectDiscard(
19	yield* sql`PRAGMA busy_timeout = 5000;`;	19	yield* sql`PRAGMA busy_timeout = 5000;`;
20	yield* sql`PRAGMA foreign_keys = ON;`;	20	yield* sql`PRAGMA foreign_keys = ON;`;
21	yield* sql`PRAGMA journal_mode = WAL;`;	21	yield* sql`PRAGMA journal_mode = WAL;`;
		22	// FULL fsyncs the WAL on every commit, on the main thread. Every provider
		23	// event is its own commit, so a slow or busy disk stalls the event loop
		24	// and clients drop. In WAL mode NORMAL only fsyncs at checkpoints. It
		25	// cannot corrupt the database and an app crash loses nothing; an OS crash
		26	// or power loss can roll back commits since the last checkpoint.
		27	yield* sql`PRAGMA synchronous = NORMAL;`;
22	// PASSIVE checkpoints never shrink the -wal file, so it otherwise keeps its	28	// PASSIVE checkpoints never shrink the -wal file, so it otherwise keeps its
23	// largest size until the last connection closes.	29	// largest size until the last connection closes.
24	yield* sql.unsafe(`PRAGMA journal_size_limit = ${WAL_SIZE_LIMIT_BYTES};`);	30	yield* sql.unsafe(`PRAGMA journal_size_limit = ${WAL_SIZE_LIMIT_BYTES};`);