diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index c2b5e66..c258da6 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -217,8 +217,8 @@ model Todo {
   id         String   @id @default(cuid())
   user       User     @relation(fields: [user_id], references: [id], onDelete: Cascade)
   user_id    String
-  product    Product  @relation(fields: [product_id], references: [id], onDelete: Cascade)
-  product_id String
+  product    Product? @relation(fields: [product_id], references: [id], onDelete: SetNull)
+  product_id String?
   title      String
   done       Boolean  @default(false)
   archived   Boolean  @default(false)