Build AI servo sample sales prototype

db/index.ts

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+import { env } from "cloudflare:workers";
+import { drizzle } from "drizzle-orm/d1";
+import * as schema from "./schema";
+
+export function getDb() {
+  if (!env.DB) {
+    throw new Error(
+      "Cloudflare D1 binding `DB` is unavailable. Set the `d1` field in .openai/hosting.json to `DB` or let your control plane inject the real binding values before using the database."
+    );
+  }
+
+  return drizzle(env.DB, { schema });
+}

db/schema.ts

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+// Intentionally empty by default.
+// Add Drizzle tables here when the site actually needs a database.
+// See examples/d1/db/schema.ts for an opt-in example.
+export {};