added mail service

data/user.ts

@@ -0,0 +1,18 @@
+import { User } from '@prisma/client'
+import { db } from '@/lib/db'
+
+export const getUserByEmail = async (email: string): Promise<User | null> => {
+  try {
+    return await db.user.findUnique({ where: { email } })
+  } catch {
+    return null
+  }
+}
+
+export const getUserById = async (id: string): Promise<User | null> => {
+  try {
+    return await db.user.findUnique({ where: { id } })
+  } catch {
+    return null
+  }
+}