linked device, device tasks and certs in database

server/internal/models/task.go

@@ -48,4 +48,5 @@ type DEviceTask struct {
 
 	// Optional: small attempt/lease system if you ever need retries/timeouts
 	// Attempts int `gorm:"not null;default:0"`
+	Device Device `gorm:"constraint:OnDelete:CASCADE;foreignKey:DeviceGUID;references:GUID"`
 }