drop db interface, use kysely instead for more more flexibility (at the cost of more coupling)

pages/chat/@id/+data.ts

@@ -1,6 +1,6 @@
 import type { PageContextServer } from "vike/types";
 import { createCaller } from "../../../server/trpc/chat.js";
-import { getDb } from "../../../database/postgres.js";
+import { getDbClient } from "../../../database/postgres.js";
 import { getOpenrouter } from "../../../server/provider.js";
 import { env } from "../../../server/env.js";
 
@@ -9,14 +9,14 @@ export type Data = Awaited<ReturnType<typeof data>>;
 export const data = async (pageContext: PageContextServer) => {
   const { id } = pageContext.routeParams;
   const caller = createCaller({
-    db: getDb(
-      (pageContext.env?.POSTGRES_CONNECTION_STRING ||
-        env.POSTGRES_CONNECTION_STRING) as string
-    ),
     openrouter: getOpenrouter(
       (pageContext.env?.OPENROUTER_API_KEY || env.OPENROUTER_API_KEY) as string
     ),
     // jwt: pageContext.,
+    dbClient: getDbClient(
+      (pageContext.env?.POSTGRES_CONNECTION_STRING ||
+        env.POSTGRES_CONNECTION_STRING) as string
+    ),
   });
 
   const [