Major changes

lib/db.ts

@@ -0,0 +1,19 @@
+import { PrismaClient } from '@prisma/client';
+import { Pool } from 'pg';
+import { PrismaPg } from '@prisma/adapter-pg';
+
+const globalForPrisma = globalThis as unknown as {
+  prisma: PrismaClient | undefined;
+};
+
+function createPrismaClient() {
+  const pool = new Pool({ connectionString: process.env.DATABASE_URL });
+  const adapter = new PrismaPg(pool);
+  return new PrismaClient({ adapter });
+}
+
+export const prisma = globalForPrisma.prisma ?? createPrismaClient();
+
+if (process.env.NODE_ENV !== 'production') {
+  globalForPrisma.prisma = prisma;
+}