Update schema.prisma

Author: chaowei126

prisma/schema.prisma

@@ -6,7 +6,7 @@ generator client {
 }
 
 datasource db {
-  provider = "postgresql"
+  provider = "mongodb"
   url      = env("DATABASE_URL")
 }
 
@@ -17,4 +17,4 @@ model Task {
   priority    String  @default("low")
   createdAt   DateTime @default(now())
   updatedAt   DateTime @updatedAt
-}
+}