feat: ship self-hosted KOC LOOP workflows

db/index.ts

@@ -1,13 +1,7 @@
-import { env } from "cloudflare:workers";
-import { drizzle } from "drizzle-orm/d1";
+import { drizzle } from "drizzle-orm/mysql2";
+import { getPool } from "../lib/database";
 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 });
+  return drizzle({ client: getPool(), schema, mode: "default" });
 }