feat(backend): initialize prisma

lib/prisma.ts

@@ -0,0 +1,16 @@
+import { PrismaClient } from '@prisma/client';
+import { withAccelerate } from '@prisma/extension-accelerate';
+
+const prismaClientSingleton = () => {
+  return new PrismaClient().$extends(withAccelerate());
+};
+
+declare const globalThis: {
+  prismaGlobal: ReturnType<typeof prismaClientSingleton>;
+} & typeof global;
+
+const prisma = globalThis.prismaGlobal ?? prismaClientSingleton();
+
+export default prisma;
+
+if (process.env.NODE_ENV !== 'production') globalThis.prismaGlobal = prisma;