diff --git a/internal/infra/models/execution.go b/internal/infra/models/execution.go
index d549cd7..96c55d9 100644
--- a/internal/infra/models/execution.go
+++ b/internal/infra/models/execution.go
@@ -184,7 +184,7 @@ type UserActionLog struct {
 	Time time.Time `gorm:"primaryKey" json:"time"`
 
 	// --- Who (谁) ---
-	UserID   uint   `gorm:"primaryKey" json:"user_id,omitempty"`
+	UserID   uint   `gorm:"not null" json:"user_id,omitempty"`
 	Username string `json:"username,omitempty"` // 操作发生时用户名的快照
 
 	// --- Where (何地) ---