diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index d15d6f4..9341741 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -1454,7 +1454,7 @@ model RequestWork {
 
   stepStatus RequestWorkStepStatus[]
 
-  creditNote   CreditNote? @relation(fields: [creditNoteId], references: [id])
+  creditNote   CreditNote? @relation(fields: [creditNoteId], references: [id], onDelete: SetNull)
   creditNoteId String?
 }
 
@@ -1462,7 +1462,7 @@ model RequestWorkStepStatus {
   step       Int
   workStatus RequestWorkStatus @default(Pending)
 
-  requestWork   RequestWork @relation(fields: [requestWorkId], references: [id])
+  requestWork   RequestWork @relation(fields: [requestWorkId], references: [id], onDelete: Cascade)
   requestWorkId String
 
   attributes Json?
@@ -1476,7 +1476,7 @@ model RequestWorkStepStatus {
 
   responsibleUserLocal Boolean?
   responsibleUserId    String?
-  responsibleUser      User?    @relation(fields: [responsibleUserId], references: [id])
+  responsibleUser      User?    @relation(fields: [responsibleUserId], references: [id], onDelete: SetNull)
 
   task Task[]
 
@@ -1517,13 +1517,13 @@ model Task {
   failedType    String?
   failedComment String?
 
-  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id])
+  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id], onDelete: Cascade)
   taskOrderId String
 }
 
 model TaskProduct {
   taskOrderId String
-  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id])
+  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id], onDelete: Cascade)
   productId   String
   product     Product   @relation(fields: [productId], references: [id])
   discount    Float?
@@ -1550,8 +1550,8 @@ model TaskOrder {
   registeredBranchId String
 
   createdAt       DateTime @default(now())
-  createdBy       User     @relation(name: "TaskOrderCreatedByUser", fields: [createdByUserId], references: [id])
-  createdByUserId String
+  createdBy       User?    @relation(name: "TaskOrderCreatedByUser", fields: [createdByUserId], references: [id])
+  createdByUserId String?
 
   userTask    UserTask[]
   taskProduct TaskProduct[]
@@ -1568,9 +1568,9 @@ model UserTask {
 
   userTaskStatus UserTaskStatus
 
-  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id])
+  taskOrder   TaskOrder @relation(fields: [taskOrderId], references: [id], onDelete: Cascade)
   taskOrderId String
-  user        User      @relation(fields: [userId], references: [id])
+  user        User      @relation(fields: [userId], references: [id], onDelete: Cascade)
   userId      String
 }