1、优化用户留存记录（按天）接口，解决查询阻塞问题；

app/admin/apis/migumanage/migu_admin.go

@@ -1550,8 +1550,28 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 
 	// 使用 goroutine 处理并发查询
 	var wg sync.WaitGroup
+
 	// 创建一个 channel 来接收每一天的查询结果
-	resultChan := make(chan models.MgUserDayRetention, 100)
+	//resultChan := make(chan models.MgUserDayRetention, 100)
+
+	// 计算预计查询天数（或月份）
+	var totalDays int
+	if req.OnlyFirstDay {
+		// 当前月的1号
+		now := time.Now()
+		currentMonthFirst := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
+		// 计算从 nextMonth 到 currentMonthFirst 包含的1号数量
+		totalDays = countFirstDays(nextMonth, currentMonthFirst)
+	} else {
+		// 按天查询：计算两个日期之间的天数
+		startDateTime, _ := time.Parse("2006-01-02", startDate)
+		currentTime, _ := time.Parse("2006-01-02", currentDate)
+		totalDays = int(currentTime.Sub(startDateTime).Hours()/24) + 1
+		if totalDays <= 0 {
+			totalDays = 1
+		}
+	}
+	resultChan := make(chan models.MgUserDayRetention, totalDays)
 
 	// 控制并发数的最大值，避免数据库过载
 	sem := make(chan struct{}, 10) // 同时最多 10 个 goroutine 执行
@@ -1577,15 +1597,16 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 
 				var retainedUserCount int64
 				var unsubOnDay int64
+				var localErr error // 使用局部变量
 
 				// 查询该天的留存用户数
-				err = e.Orm.Model(&models.MgOrder{}).
+				localErr = e.Orm.Model(&models.MgOrder{}).
 					Where("state = 1 AND created_at between ? and ?", currentMonthFirstDay, currentMonthNextFirstDay).
 					Or("state = 2 AND unsubscribe_time > ? AND created_at between ? and ?", date+" 23:59:59", currentMonthFirstDay, currentMonthNextFirstDay).
 					Count(&retainedUserCount).Error
 
 				// 查询该天的退订用户数
-				err = e.Orm.Table("mg_order").
+				localErr = e.Orm.Table("mg_order").
 					Where("unsubscribe_time >= ?", date+" 00:00:00").
 					Where("unsubscribe_time <= ?", date+" 23:59:59").
 					Where("created_at >= ?", currentMonthFirstDay).
@@ -1593,8 +1614,8 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 					Where("state = 2"). // 状态为2表示退订
 					Count(&unsubOnDay).Error
 
-				if err != nil {
+				if localErr != nil {
-					e.Logger.Error(err)
+					e.Logger.Error(localErr)
 					return
 				}
 
@@ -1636,6 +1657,7 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 
 				var retainedUserCount int64
 				var unsubOnDay int64
+				var localErr error // 使用局部变量
 
 				// 查询该天的留存用户数
 				err = e.Orm.Model(&models.MgOrder{}).
@@ -1643,8 +1665,10 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 					Or("state = 2 AND unsubscribe_time > ? AND created_at between ? and ?", date+" 23:59:59", currentMonthFirstDay, currentMonthNextFirstDay).
 					Count(&retainedUserCount).Error
 
+				//retainedUserCount, localErr = getRetentionForDay(date, e.Orm, currentMonthFirstDay, currentMonthNextFirstDay)
+
 				// 查询该天的退订用户数
-				err = e.Orm.Table("mg_order").
+				localErr = e.Orm.Table("mg_order").
 					Where("unsubscribe_time >= ?", date+" 00:00:00").
 					Where("unsubscribe_time <= ?", date+" 23:59:59").
 					Where("created_at >= ?", currentMonthFirstDay).
@@ -1652,8 +1676,8 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 					Where("state = 2"). // 状态为2表示退订
 					Count(&unsubOnDay).Error
 
-				if err != nil {
+				if localErr != nil {
-					e.Logger.Error(err)
+					e.Logger.Error(localErr)
 					return
 				}
 
@@ -1716,6 +1740,39 @@ func (e MiGuDeployService) UserDayRetentionList(c *gin.Context) {
 	e.OK(resp, "success")
 }
 
+// monthsBetween 返回 start 和 end 之间完整的月份数。
+// 如果 end 的日期在 start 的日期之前（不满一个月），则不计入。
+func monthsBetween(start, end time.Time) int {
+	// 保证 start 在前，end 在后
+	if start.After(end) {
+		start, end = end, start
+	}
+
+	y1, m1, d1 := start.Date()
+	y2, m2, d2 := end.Date()
+
+	// 计算年份和月份的差异
+	months := (y2-y1)*12 + int(m2-m1)
+	// 如果 end 的日子小于 start 的日子，说明还没有满一个月
+	if d2 < d1 {
+		months--
+	}
+	return months
+}
+
+// countFirstDays 返回从 start 到 end（均为每月1号）之间包含的月份数。
+// 例如：start = 2024-11-01, end = 2025-02-01，则返回 4（分别是 2024-11-01, 2024-12-01, 2025-01-01, 2025-02-01）。
+func countFirstDays(start, end time.Time) int {
+	// 如果 start 在 end 之后，返回 0
+	if start.After(end) {
+		return 1
+	}
+	y1, m1, _ := start.Date()
+	y2, m2, _ := end.Date()
+	// 计算月份差，注意此处 start 和 end 都应为当月1号
+	return (y2-y1)*12 + int(m2-m1) + 1
+}
+
 // SysChannelList 查询系统渠道编码
 // @Summary 查询系统渠道编码
 // @Tags 2024-咪咕-管理后台
@@ -2081,25 +2138,25 @@ func (e MiGuDeployService) CalculateRevenueAnalysis(c *gin.Context) {
 		query = query.Where("channel_code = ?", req.Channel)
 	}
 
-	// 获取每个月的新用户数和有效用户数，以下代码是按退订时间超过1天来统计数据
+	//// 获取每个月的新用户数和有效用户数，以下代码是按退订时间超过1天来统计数据
 	var result []models.MonthlyRetention
 	err = query.
 		Select(`DATE_FORMAT(subscribe_time, '%Y-%m') AS month,
-	      COUNT(DISTINCT phone_number) AS new_user_count,
+	     COUNT(DISTINCT phone_number) AS new_user_count,
-	      COUNT(DISTINCT CASE
+	     COUNT(DISTINCT CASE
-	          WHEN unsubscribe_time IS NULL OR TIMESTAMPDIFF(HOUR, subscribe_time, unsubscribe_time) > 24
+	         WHEN unsubscribe_time IS NULL OR TIMESTAMPDIFF(HOUR, subscribe_time, unsubscribe_time) > 24
-	          THEN phone_number END) AS valid_users_count`).
+	         THEN phone_number END) AS valid_users_count`).
 		Group("month").
 		Order("month").
 		Find(&result).Error
 
-	//	以下代码是按非1小时退订来统计数据
+	////以下代码是按非1小时退订来统计数据
 	//err = query.
 	//	Select(`DATE_FORMAT(subscribe_time, '%Y-%m') AS month,
-	//       COUNT(DISTINCT phone_number) AS new_user_count,
+	//      COUNT(DISTINCT phone_number) AS new_user_count,
-	//       COUNT(DISTINCT CASE
+	//      COUNT(DISTINCT CASE
-	//           WHEN is_one_hour_cancel != 1
+	//          WHEN is_one_hour_cancel != 1
-	//           THEN phone_number END) AS valid_users_count`).
+	//          THEN phone_number END) AS valid_users_count`).
 	//	Group("month").
 	//	Order("month").
 	//	Find(&result).Error