diff --git a/internal/infra/models/execution.go b/internal/infra/models/execution.go
index 96c55d9..9a8a58d 100644
--- a/internal/infra/models/execution.go
+++ b/internal/infra/models/execution.go
@@ -180,6 +180,9 @@ func (a AuditContextKey) String() string {
 
 // UserActionLog 记录用户的操作历史，用于审计
 type UserActionLog struct {
+	// 用 ID 和 Time 组成复合主键, 防止高并发时时间重复
+	ID uint `gorm:"primaryKey"`
+
 	// Time 是操作发生的时间，作为主键和超表的时间分区键
 	Time time.Time `gorm:"primaryKey" json:"time"`