feat(db): add read replicas

lib/db/index.ts

@@ -1,4 +1,10 @@
 import { drizzle } from "drizzle-orm/bun-sql";
 import * as schema from "./schema";
+import { withReplicas } from "drizzle-orm/pg-core";
 
-export const db = drizzle(process.env.DATABASE_URL!, { schema });
+export const db = process.env.REPLICA_DATABASE_URL
+  ? withReplicas(drizzle(process.env.DATABASE_URL!, { schema }), [
+      drizzle(process.env.REPLICA_DATABASE_URL!, { schema }),
+      drizzle(process.env.REPLICA_DATABASE_URL!, { schema }),
+    ])
+  : drizzle(process.env.DATABASE_URL!, { schema });

lib/db/sse-endpoints.ts

@@ -56,7 +56,7 @@ export const sse = sseEndpointMap({
   },
   slip_sync: {
     complete: z.custom<TTrackingKey>(),
-    connected: z.custom<TTrackingKey>()
+    connected: z.custom<TTrackingKey>(),
   },
 });
 export const adminSseList: (keyof typeof sse)[] = ["log"];