Booking Engine

Architecture: Six focused services with the BookingService/SchedulingService overlap resolved by giving SchedulingService exactly one job, the transactional double-booking guard , while BookingService owns the create/reschedule/cancel workflow around it.

59 unit tests, 24 integration tests

vitest.integration.config.mts

@@ -0,0 +1,16 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  resolve: { tsconfigPaths: true },
+  test: {
+    environment: "node",
+    globals: false,
+    include: ["**/*.integration.test.ts"],
+    exclude: ["node_modules/**", ".next/**", "templates/**"],
+    // Concurrency tests (double-booking prevention) need real, unshared
+    // DB connections and predictable ordering — run integration test
+    // files one at a time.
+    fileParallelism: false,
+    testTimeout: 20000,
+  },
+});