feat: cron task style fix

internal/models/send_stats.go

@@ -1,18 +1,16 @@
 package models
 
 import (
-	"time"
-
 	"baihu/internal/constant"
 )
 
 // SendStats 任务执行统计
 type SendStats struct {
-	ID        uint      `json:"id" gorm:"primaryKey"`
-	TaskID    uint      `json:"task_id" gorm:"index"`
-	Status    string    `json:"status" gorm:"size:20;not null"` // success, failed
-	Num       int       `json:"num" gorm:"default:0"`
-	CreatedAt time.Time `json:"created_at"`
+	ID     uint   `json:"id" gorm:"primaryKey"`
+	TaskID uint   `json:"task_id" gorm:"uniqueIndex:idx_task_day_status"`
+	Day    string `json:"day" gorm:"size:10;uniqueIndex:idx_task_day_status"` // 格式: 2006-01-02
+	Status string `json:"status" gorm:"size:20;uniqueIndex:idx_task_day_status"`
+	Num    int    `json:"num" gorm:"default:0"`
 }
 
 func (SendStats) TableName() string {