fix: db

prisma/schema.prisma

@@ -1,7 +1,6 @@
 datasource db {
     provider = "mysql"
     url      = env("DATABASE_URL")
-  relationMode = "prisma"
 }
 
 generator client {
@@ -11,12 +10,14 @@ generator client {
 model Keys {
     id     Int     @id @default(autoincrement())
     key    String  @unique
+    grades Grade[]
 }
 
 model Grade {
     id        Int      @id @default(autoincrement())
     test      Int
     grade     Float
-  key       String
+    key       Keys     @relation(fields: [keyId], references: [id])
+    keyId     Int
     createdAt DateTime @default(now())
 }