Merge PR #105: fix(数据层): 修复软删除与唯一约束冲突问题 和 添加 model 参数必填验证

backend/ent/migrate/schema.go

@@ -204,7 +204,7 @@ var (
 		{Name: "created_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "deleted_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
-		{Name: "name", Type: field.TypeString, Unique: true, Size: 100},
+		{Name: "name", Type: field.TypeString, Size: 100},
 		{Name: "description", Type: field.TypeString, Nullable: true, SchemaType: map[string]string{"postgres": "text"}},
 		{Name: "rate_multiplier", Type: field.TypeFloat64, Default: 1, SchemaType: map[string]string{"postgres": "decimal(10,4)"}},
 		{Name: "is_exclusive", Type: field.TypeBool, Default: false},
@@ -470,7 +470,7 @@ var (
 		{Name: "created_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "deleted_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
-		{Name: "email", Type: field.TypeString, Unique: true, Size: 255},
+		{Name: "email", Type: field.TypeString, Size: 255},
 		{Name: "password_hash", Type: field.TypeString, Size: 255},
 		{Name: "role", Type: field.TypeString, Size: 20, Default: "user"},
 		{Name: "balance", Type: field.TypeFloat64, Default: 0, SchemaType: map[string]string{"postgres": "decimal(20,8)"}},
@@ -605,7 +605,7 @@ var (
 			},
 			{
 				Name:    "usersubscription_user_id_group_id",
-				Unique:  true,
+				Unique:  false,
 				Columns: []*schema.Column{UserSubscriptionsColumns[16], UserSubscriptionsColumns[15]},
 			},
 			{

backend/ent/schema/group.go

@@ -33,10 +33,11 @@ func (Group) Mixin() []ent.Mixin {
 
 func (Group) Fields() []ent.Field {
 	return []ent.Field{
+		// 唯一约束通过部分索引实现（WHERE deleted_at IS NULL），支持软删除后重用
+		// 见迁移文件 016_soft_delete_partial_unique_indexes.sql
 		field.String("name").
 			MaxLen(100).
-			NotEmpty().
-			Unique(),
+			NotEmpty(),
 		field.String("description").
 			Optional().
 			Nillable().

backend/ent/schema/user.go

@@ -33,10 +33,11 @@ func (User) Mixin() []ent.Mixin {
 
 func (User) Fields() []ent.Field {
 	return []ent.Field{
+		// 唯一约束通过部分索引实现（WHERE deleted_at IS NULL），支持软删除后重用
+		// 见迁移文件 016_soft_delete_partial_unique_indexes.sql
 		field.String("email").
 			MaxLen(255).
-			NotEmpty().
-			Unique(),
+			NotEmpty(),
 		field.String("password_hash").
 			MaxLen(255).
 			NotEmpty(),

backend/ent/schema/user_subscription.go

@@ -109,7 +109,9 @@ func (UserSubscription) Indexes() []ent.Index {
 		index.Fields("status"),
 		index.Fields("expires_at"),
 		index.Fields("assigned_by"),
-		index.Fields("user_id", "group_id").Unique(),
+		// 唯一约束通过部分索引实现（WHERE deleted_at IS NULL），支持软删除后重新订阅
+		// 见迁移文件 016_soft_delete_partial_unique_indexes.sql
+		index.Fields("user_id", "group_id"),
 		index.Fields("deleted_at"),
 	}
 }

backend/internal/handler/gateway_handler.go

@@ -88,6 +88,12 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	reqModel := parsedReq.Model
 	reqStream := parsedReq.Stream
 
+	// 验证 model 必填
+	if reqModel == "" {
+		h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
+		return
+	}
+
 	// Track if we've started streaming (for error handling)
 	streamStarted := false
 
@@ -517,6 +523,12 @@ func (h *GatewayHandler) CountTokens(c *gin.Context) {
 		return
 	}
 
+	// 验证 model 必填
+	if parsedReq.Model == "" {
+		h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
+		return
+	}
+
 	// 获取订阅信息（可能为nil）
 	subscription, _ := middleware2.GetSubscriptionFromContext(c)
 

backend/internal/handler/openai_gateway_handler.go

@@ -80,6 +80,12 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	reqModel, _ := reqBody["model"].(string)
 	reqStream, _ := reqBody["stream"].(bool)
 
+	// 验证 model 必填
+	if reqModel == "" {
+		h.errorResponse(c, http.StatusBadRequest, "invalid_request_error", "model is required")
+		return
+	}
+
 	// For non-Codex CLI requests, set default instructions
 	userAgent := c.GetHeader("User-Agent")
 	if !openai.IsCodexCLIRequest(userAgent) {

backend/migrations/016_soft_delete_partial_unique_indexes.sql

+-- 016_soft_delete_partial_unique_indexes.sql
+-- 修复软删除 + 唯一约束冲突问题
+-- 将普通唯一约束替换为部分唯一索引（WHERE deleted_at IS NULL）
+-- 这样软删除的记录不会占用唯一约束位置，允许删后重建同名/同邮箱/同订阅关系
+
+-- ============================================================================
+-- 1. users 表: email 字段
+-- ============================================================================
+
+-- 删除旧的唯一约束（可能的命名方式）
+ALTER TABLE users DROP CONSTRAINT IF EXISTS users_email_key;
+DROP INDEX IF EXISTS users_email_key;
+DROP INDEX IF EXISTS user_email_key;
+
+-- 创建部分唯一索引：只对未删除的记录建立唯一约束
+CREATE UNIQUE INDEX IF NOT EXISTS users_email_unique_active
+    ON users(email)
+    WHERE deleted_at IS NULL;
+
+-- ============================================================================
+-- 2. groups 表: name 字段
+-- ============================================================================
+
+-- 删除旧的唯一约束
+ALTER TABLE groups DROP CONSTRAINT IF EXISTS groups_name_key;
+DROP INDEX IF EXISTS groups_name_key;
+DROP INDEX IF EXISTS group_name_key;
+
+-- 创建部分唯一索引
+CREATE UNIQUE INDEX IF NOT EXISTS groups_name_unique_active
+    ON groups(name)
+    WHERE deleted_at IS NULL;
+
+-- ============================================================================
+-- 3. user_subscriptions 表: (user_id, group_id) 组合字段
+-- ============================================================================
+
+-- 删除旧的唯一约束/索引
+ALTER TABLE user_subscriptions DROP CONSTRAINT IF EXISTS user_subscriptions_user_id_group_id_key;
+DROP INDEX IF EXISTS user_subscriptions_user_id_group_id_key;
+DROP INDEX IF EXISTS usersubscription_user_id_group_id;
+
+-- 创建部分唯一索引
+CREATE UNIQUE INDEX IF NOT EXISTS user_subscriptions_user_group_unique_active
+    ON user_subscriptions(user_id, group_id)
+    WHERE deleted_at IS NULL;
+
+-- ============================================================================
+-- 注意: api_keys 表的 key 字段保留普通唯一约束
+-- API Key 即使软删除后也不应该重复使用（安全考虑）
+-- ============================================================================