feat: centralize application framework primitives

packages/db/test/helpers.test.ts

@@ -5,6 +5,7 @@ import {
   createRepository,
   databaseHealth,
   retryTransaction,
+  compareAndSet,
 } from "../src/index.ts";
 import type { Driver, Row } from "../src/index.ts";
 
@@ -28,6 +29,17 @@ function memoryDriver(): Driver {
 }
 
 describe("database helper kit", () => {
+  test("compareAndSet reports whether the guarded transition won", async () => {
+    const db = createDb(memoryDriver());
+    expect(
+      await compareAndSet(db, {
+        table: "messages",
+        id: 1,
+        from: "pending",
+        to: "sending",
+      }),
+    ).toBe(true);
+  });
   test("provides repository CRUD helpers and health checks", async () => {
     const db = createDb(memoryDriver());
     const repository = createRepository<{ id: number; name: string }>(db, {