diff --git a/backend/prisma/migrations/20260223200000_add_soft_delete/migration.sql b/backend/prisma/migrations/20260223200000_add_soft_delete/migration.sql
index 2e1a248..9ff874e 100644
--- a/backend/prisma/migrations/20260223200000_add_soft_delete/migration.sql
+++ b/backend/prisma/migrations/20260223200000_add_soft_delete/migration.sql
@@ -6,15 +6,3 @@ ALTER TABLE "projects" ADD COLUMN "deleted_at" TIMESTAMP(3);
 
 -- AlterTable: add deleted_at column to time_entries
 ALTER TABLE "time_entries" ADD COLUMN "deleted_at" TIMESTAMP(3);
-
--- DropForeignKey: remove cascade from projects -> clients
-ALTER TABLE "projects" DROP CONSTRAINT "projects_client_id_fkey";
-
--- DropForeignKey: remove cascade from time_entries -> projects
-ALTER TABLE "time_entries" DROP CONSTRAINT "time_entries_project_id_fkey";
-
--- AddForeignKey: re-add without onDelete cascade
-ALTER TABLE "projects" ADD CONSTRAINT "projects_client_id_fkey" FOREIGN KEY ("client_id") REFERENCES "clients"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
-
--- AddForeignKey: re-add without onDelete cascade
-ALTER TABLE "time_entries" ADD CONSTRAINT "time_entries_project_id_fkey" FOREIGN KEY ("project_id") REFERENCES "projects"("id") ON DELETE RESTRICT ON UPDATE CASCADE;
diff --git a/backend/prisma/schema.prisma b/backend/prisma/schema.prisma
index 0932af2..5f8fc9e 100644
--- a/backend/prisma/schema.prisma
+++ b/backend/prisma/schema.prisma
@@ -53,7 +53,7 @@ model Project {
   userId   String @map("user_id") @db.VarChar(255)
   user     User   @relation(fields: [userId], references: [id], onDelete: Cascade)
   clientId String @map("client_id")
-  client   Client @relation(fields: [clientId], references: [id])
+  client   Client @relation(fields: [clientId], references: [id], onDelete: Cascade)
 
   timeEntries   TimeEntry[]
   ongoingTimers OngoingTimer[]
@@ -76,7 +76,7 @@ model TimeEntry {
   userId    String  @map("user_id") @db.VarChar(255)
   user      User    @relation(fields: [userId], references: [id], onDelete: Cascade)
   projectId String  @map("project_id")
-  project   Project @relation(fields: [projectId], references: [id])
+  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)
 
   @@index([userId])
   @@index([userId, startTime])