fix: prisma v7 config

prisma.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from "prisma/config";
+
+export default defineConfig({
+  migrations: {
+    path: "prisma/migrations",
+  },
+});

src/db.ts

@@ -4,6 +4,7 @@ import kyselyExtension from "prisma-extension-kysely";
 import type { DB } from "./generated/kysely/types";
 
 const prisma = new PrismaClient({
+  datasourceUrl: process.env.DATABASE_URL,
   errorFormat: process.env.NODE_ENV === "production" ? "minimal" : "pretty",
 }).$extends(
   kyselyExtension({