Phase 2

Base app architecture:

    Route groups for customer, staff and owner.
* Reusable design system with around 20 UI components.
* Complete Prisma schema.
* Authentication with email/password and Google.
* Role and permission model.
* Protected routes.
* Clean separation between features, services, components and shared utilities.

src/lib/db/prisma.ts

@@ -0,0 +1,34 @@
+import { PrismaClient } from "@/generated/prisma/client";
+import { PrismaPg } from "@prisma/adapter-pg";
+
+/**
+ * Single Prisma Client instance for the whole app.
+ *
+ * Prisma 7 requires a driver adapter instead of a `datasource.url` in the
+ * schema (see prisma/schema.prisma). This is the ONLY file that imports
+ * `@prisma/adapter-pg` — switching to MySQL later means swapping this one
+ * adapter (`@prisma/adapter-mariadb`), updating `datasource.provider` in
+ * the schema, and re-running `prisma migrate dev`. No other file in the
+ * app touches the database driver directly.
+ */
+
+const globalForPrisma = globalThis as unknown as {
+  prisma: PrismaClient | undefined;
+};
+
+const adapter = new PrismaPg({
+  connectionString: process.env.DATABASE_URL,
+});
+
+export const prisma =
+  globalForPrisma.prisma ??
+  new PrismaClient({
+    adapter,
+    log: process.env.NODE_ENV === "development" ? ["warn", "error"] : ["error"],
+  });
+
+// Reuse the client across hot-reloads in dev so we don't exhaust the
+// connection pool every time a file changes.
+if (process.env.NODE_ENV !== "production") {
+  globalForPrisma.prisma = prisma;
+}