fix: 统一逐租户上下文执行

src/Infrastructure/TakeoutSaaS.Infrastructure/BackgroundServices/SubscriptionExpiryCheckService.cs

@@ -5,6 +5,7 @@ using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using TakeoutSaaS.Domain.Tenants.Enums;
 using TakeoutSaaS.Infrastructure.App.Persistence;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
 
 namespace TakeoutSaaS.Infrastructure.BackgroundServices;
 
@@ -67,45 +68,70 @@ public sealed class SubscriptionExpiryCheckService : BackgroundService
 
         using var scope = _serviceProvider.CreateScope();
         var dbContext = scope.ServiceProvider.GetRequiredService<TakeoutAppDbContext>();
+        var tenantContextAccessor = scope.ServiceProvider.GetRequiredService<ITenantContextAccessor>();
 
         var now = DateTime.UtcNow;
         var gracePeriodDays = _options.GracePeriodDays;
 
         try
         {
-            // 1. 检查活跃订阅中已到期的，转为宽限期
-            var expiredActive = await dbContext.TenantSubscriptions
-                .Where(s => s.Status == SubscriptionStatus.Active && s.EffectiveTo < now)
+            var tenants = await dbContext.Tenants
+                .AsNoTracking()
+                .Where(x => x.DeletedAt == null && x.Id > 0)
+                .Select(x => new { x.Id, x.Code })
                 .ToListAsync(cancellationToken);
-
-            foreach (var subscription in expiredActive)
+            if (tenants.Count == 0)
             {
-                subscription.Status = SubscriptionStatus.GracePeriod;
-                _logger.LogInformation(
-                    "订阅 {SubscriptionId} (租户 {TenantId}) 已到期，进入宽限期",
-                    subscription.Id, subscription.TenantId);
+                _logger.LogInformation("订阅到期检查完成：未找到可处理租户");
+                return;
             }
 
-            // 2. 检查宽限期订阅中超过宽限期的，转为暂停
-            var gracePeriodExpired = await dbContext.TenantSubscriptions
-                .Where(s => s.Status == SubscriptionStatus.GracePeriod
-                         && s.EffectiveTo.AddDays(gracePeriodDays) < now)
-                .ToListAsync(cancellationToken);
-
-            foreach (var subscription in gracePeriodExpired)
+            var changedTotal = 0;
+            var expiredTotal = 0;
+            var suspendedTotal = 0;
+            foreach (var tenant in tenants)
             {
-                subscription.Status = SubscriptionStatus.Suspended;
-                _logger.LogInformation(
-                    "订阅 {SubscriptionId} (租户 {TenantId}) 宽限期已结束，已暂停",
-                    subscription.Id, subscription.TenantId);
-            }
+                using (tenantContextAccessor.EnterTenantScope(tenant.Id, "background:subscription-expiry", tenant.Code))
+                {
+                    // 1. 检查活跃订阅中已到期的，转为宽限期
+                    var expiredActive = await dbContext.TenantSubscriptions
+                        .Where(s => s.Status == SubscriptionStatus.Active && s.EffectiveTo < now)
+                        .ToListAsync(cancellationToken);
 
-            // 3. 保存更改
-            var changedCount = await dbContext.SaveChangesAsync(cancellationToken);
+                    foreach (var subscription in expiredActive)
+                    {
+                        subscription.Status = SubscriptionStatus.GracePeriod;
+                        _logger.LogInformation(
+                            "订阅 {SubscriptionId} (租户 {TenantId}) 已到期，进入宽限期",
+                            subscription.Id, subscription.TenantId);
+                    }
+
+                    // 2. 检查宽限期订阅中超过宽限期的，转为暂停
+                    var gracePeriodExpired = await dbContext.TenantSubscriptions
+                        .Where(s => s.Status == SubscriptionStatus.GracePeriod
+                                 && s.EffectiveTo.AddDays(gracePeriodDays) < now)
+                        .ToListAsync(cancellationToken);
+
+                    foreach (var subscription in gracePeriodExpired)
+                    {
+                        subscription.Status = SubscriptionStatus.Suspended;
+                        _logger.LogInformation(
+                            "订阅 {SubscriptionId} (租户 {TenantId}) 宽限期已结束，已暂停",
+                            subscription.Id, subscription.TenantId);
+                    }
+
+                    // 3. 保存更改（逐租户保存，避免跨租户写入）
+                    var changedCount = await dbContext.SaveChangesAsync(cancellationToken);
+
+                    changedTotal += changedCount;
+                    expiredTotal += expiredActive.Count;
+                    suspendedTotal += gracePeriodExpired.Count;
+                }
+            }
 
             _logger.LogInformation(
                 "订阅到期检查完成，共更新 {Count} 条记录 (到期转宽限期: {ExpiredCount}, 宽限期转暂停: {SuspendedCount})",
-                changedCount, expiredActive.Count, gracePeriodExpired.Count);
+                changedTotal, expiredTotal, suspendedTotal);
         }
         catch (Exception ex)
         {