fix(server): harden SQLite durability under streaming writes

apps/server/src/persistence/Layers/Sqlite.test.ts

@@ -0,0 +1,19 @@
+import { assert, it } from "@effect/vitest";
+import * as Effect from "effect/Effect";
+import * as SqlClient from "effect/unstable/sql/SqlClient";
+
+import { SqlitePersistenceMemory } from "./Sqlite.ts";
+
+const layer = it.layer(SqlitePersistenceMemory);
+
+layer("Sqlite persistence setup", (it) => {
+  it.effect("uses full synchronous durability", () =>
+    Effect.gen(function* () {
+      const sql = yield* SqlClient.SqlClient;
+
+      const rows = yield* sql<{ readonly synchronous: number }>`PRAGMA synchronous;`;
+
+      assert.equal(rows[0]?.synchronous, 2);
+    }),
+  );
+});

apps/server/src/persistence/Layers/Sqlite.ts

@@ -34,6 +34,7 @@ const setup = Layer.effectDiscard(
   Effect.gen(function* () {
     const sql = yield* SqlClient.SqlClient;
     yield* sql`PRAGMA journal_mode = WAL;`;
+    yield* sql`PRAGMA synchronous = FULL;`;
     yield* sql`PRAGMA foreign_keys = ON;`;
     yield* runMigrations();
   }),