feat: migrate snowflake ids and refresh migrations

src/Infrastructure/TakeoutSaaS.Infrastructure/Common/Persistence/AppDbContext.cs

@@ -3,15 +3,20 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Metadata.Builders;
 using TakeoutSaaS.Shared.Abstractions.Entities;
 using TakeoutSaaS.Shared.Abstractions.Security;
+using TakeoutSaaS.Shared.Abstractions.Ids;
 
 namespace TakeoutSaaS.Infrastructure.Common.Persistence;
 
 /// <summary>
 /// 应用基础 DbContext，统一处理审计字段、软删除与全局查询过滤。
 /// </summary>
-public abstract class AppDbContext(DbContextOptions options, ICurrentUserAccessor? currentUserAccessor = null) : DbContext(options)
+public abstract class AppDbContext(
+    DbContextOptions options,
+    ICurrentUserAccessor? currentUserAccessor = null,
+    IIdGenerator? idGenerator = null) : DbContext(options)
 {
     private readonly ICurrentUserAccessor? _currentUserAccessor = currentUserAccessor;
+    private readonly IIdGenerator? _idGenerator = idGenerator;
 
     /// <summary>
     /// 构建模型时应用软删除过滤器。
@@ -50,10 +55,35 @@ public abstract class AppDbContext(DbContextOptions options, ICurrentUserAccesso
     /// </summary>
     protected virtual void OnBeforeSaving()
     {
+        ApplyIdGeneration();
         ApplySoftDeleteMetadata();
         ApplyAuditMetadata();
     }
 
+    /// <summary>
+    /// 为新增实体生成雪花 ID。
+    /// </summary>
+    private void ApplyIdGeneration()
+    {
+        if (_idGenerator == null)
+        {
+            return;
+        }
+
+        foreach (var entry in ChangeTracker.Entries<EntityBase>())
+        {
+            if (entry.State != EntityState.Added)
+            {
+                continue;
+            }
+
+            if (entry.Entity.Id == 0)
+            {
+                entry.Entity.Id = _idGenerator.NextId();
+            }
+        }
+    }
+
     /// <summary>
     /// 将软删除实体的删除操作转换为设置 DeletedAt。
     /// </summary>
@@ -114,10 +144,10 @@ public abstract class AppDbContext(DbContextOptions options, ICurrentUserAccesso
         }
     }
 
-    private Guid? GetCurrentUserIdOrNull()
+    private long? GetCurrentUserIdOrNull()
     {
-        var userId = _currentUserAccessor?.UserId ?? Guid.Empty;
-        return userId == Guid.Empty ? null : userId;
+        var userId = _currentUserAccessor?.UserId ?? 0;
+        return userId == 0 ? null : userId;
     }
 
     /// <summary>

src/Infrastructure/TakeoutSaaS.Infrastructure/Common/Persistence/DesignTime/DesignTimeDbContextFactoryBase.cs

@@ -141,12 +141,12 @@ internal abstract class DesignTimeDbContextFactoryBase<TContext> : IDesignTimeDb
 
     private sealed class DesignTimeTenantProvider : ITenantProvider
     {
-        public Guid GetCurrentTenantId() => Guid.Empty;
+        public long GetCurrentTenantId() => 0;
     }
 
     private sealed class DesignTimeCurrentUserAccessor : ICurrentUserAccessor
     {
-        public Guid UserId => Guid.Empty;
+        public long UserId => 0;
         public bool IsAuthenticated => false;
     }
 }

src/Infrastructure/TakeoutSaaS.Infrastructure/Common/Persistence/TenantAwareDbContext.cs

@@ -3,6 +3,7 @@ using Microsoft.EntityFrameworkCore;
 using TakeoutSaaS.Shared.Abstractions.Entities;
 using TakeoutSaaS.Shared.Abstractions.Security;
 using TakeoutSaaS.Shared.Abstractions.Tenancy;
+using TakeoutSaaS.Shared.Abstractions.Ids;
 
 namespace TakeoutSaaS.Infrastructure.Common.Persistence;
 
@@ -12,14 +13,15 @@ namespace TakeoutSaaS.Infrastructure.Common.Persistence;
 public abstract class TenantAwareDbContext(
     DbContextOptions options,
     ITenantProvider tenantProvider,
-    ICurrentUserAccessor? currentUserAccessor = null) : AppDbContext(options, currentUserAccessor)
+    ICurrentUserAccessor? currentUserAccessor = null,
+    IIdGenerator? idGenerator = null) : AppDbContext(options, currentUserAccessor, idGenerator)
 {
     private readonly ITenantProvider _tenantProvider = tenantProvider ?? throw new ArgumentNullException(nameof(tenantProvider));
 
     /// <summary>
     /// 当前请求租户 ID。
     /// </summary>
-    protected Guid CurrentTenantId => _tenantProvider.GetCurrentTenantId();
+    protected long CurrentTenantId => _tenantProvider.GetCurrentTenantId();
 
     /// <summary>
     /// 保存前填充租户元数据并执行基础处理。
@@ -71,7 +73,7 @@ public abstract class TenantAwareDbContext(
 
         foreach (var entry in ChangeTracker.Entries<IMultiTenantEntity>())
         {
-            if (entry.State == EntityState.Added && entry.Entity.TenantId == Guid.Empty && tenantId != Guid.Empty)
+            if (entry.State == EntityState.Added && entry.Entity.TenantId == 0 && tenantId != 0)
             {
                 entry.Entity.TenantId = tenantId;
             }