feat: 套餐使用统计增加MRR与ARR

src/Application/TakeoutSaaS.Application/App/Tenants/Dto/TenantPackageUsageDto.cs

@@ -24,5 +24,14 @@ public sealed class TenantPackageUsageDto
     /// 历史总订阅记录数量（不含软删）。
     /// </summary>
     public int TotalSubscriptionCount { get; init; }
-}
 
+    /// <summary>
+    /// MRR（Monthly Recurring Revenue）粗看：按“当前有效订阅数 × 套餐月付等效价”估算。
+    /// </summary>
+    public decimal Mrr { get; init; }
+
+    /// <summary>
+    /// ARR（Annual Recurring Revenue）粗看：按“当前有效订阅数 × 套餐年付等效价”估算。
+    /// </summary>
+    public decimal Arr { get; init; }
+}

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/GetTenantPackageUsagesQueryHandler.cs

@@ -45,7 +45,9 @@ public sealed class GetTenantPackageUsagesQueryHandler(IDapperExecutor dapperExe
                         TenantPackageId = reader.GetInt64(0),
                         ActiveSubscriptionCount = reader.GetInt32(1),
                         ActiveTenantCount = reader.GetInt32(2),
-                        TotalSubscriptionCount = reader.GetInt32(3)
+                        TotalSubscriptionCount = reader.GetInt32(3),
+                        Mrr = reader.IsDBNull(4) ? 0m : reader.GetDecimal(4),
+                        Arr = reader.IsDBNull(5) ? 0m : reader.GetDecimal(5)
                     });
                 }
 
@@ -56,9 +58,10 @@ public sealed class GetTenantPackageUsagesQueryHandler(IDapperExecutor dapperExe
 
     private static string BuildSql(long[]? ids, out (string Name, object? Value)[] parameters, DateTime now)
     {
-        // 1. 基础查询
+        // 1. 基础查询：先按订阅表聚合，再回连套餐表计算 MRR/ARR
         var builder = new System.Text.StringBuilder();
         builder.AppendLine("""
+            with stats as (
               select
                 "TenantPackageId" as "TenantPackageId",
                 count(*) filter (where "Status" = 1 and "EffectiveFrom" <= @now and "EffectiveTo" >= @now) as "ActiveSubscriptionCount",
@@ -92,8 +95,20 @@ public sealed class GetTenantPackageUsagesQueryHandler(IDapperExecutor dapperExe
             builder.AppendLine(")");
         }
 
-        // 3. (空行后) 分组
-        builder.AppendLine("group by \"TenantPackageId\";");
+        // 3. (空行后) 分组与回连套餐表
+        builder.AppendLine("""
+              group by "TenantPackageId"
+            )
+            select
+              s."TenantPackageId" as "TenantPackageId",
+              s."ActiveSubscriptionCount" as "ActiveSubscriptionCount",
+              s."ActiveTenantCount" as "ActiveTenantCount",
+              s."TotalSubscriptionCount" as "TotalSubscriptionCount",
+              (s."ActiveSubscriptionCount"::numeric * coalesce(p."MonthlyPrice", (p."YearlyPrice" / 12.0), 0))::numeric(18, 2) as "Mrr",
+              (s."ActiveSubscriptionCount"::numeric * coalesce(p."YearlyPrice", (p."MonthlyPrice" * 12), 0))::numeric(18, 2) as "Arr"
+            from stats s
+            left join public.tenant_packages p on p."Id" = s."TenantPackageId" and p."DeletedAt" is null;
+            """);
 
         parameters = list.ToArray();
         return builder.ToString();