Merge pull request #670 from DaydreamCoding/feat/admin-apikey-group-update

feat(admin): 添加管理员直接修改用户 API Key 分组的功能 

backend/cmd/server/wire_gen.go

@@ -103,7 +103,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	proxyRepository := repository.NewProxyRepository(client, db)
 	proxyExitInfoProber := repository.NewProxyExitInfoProber(configConfig)
 	proxyLatencyCache := repository.NewProxyLatencyCache(redisClient)
-	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, soraAccountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator)
+	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, soraAccountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator, client)
 	concurrencyCache := repository.ProvideConcurrencyCache(redisClient, configConfig)
 	concurrencyService := service.ProvideConcurrencyService(concurrencyCache, accountRepository, configConfig)
 	adminUserHandler := admin.NewUserHandler(adminService, concurrencyService)
@@ -192,7 +192,8 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	errorPassthroughCache := repository.NewErrorPassthroughCache(redisClient)
 	errorPassthroughService := service.NewErrorPassthroughService(errorPassthroughRepository, errorPassthroughCache)
 	errorPassthroughHandler := admin.NewErrorPassthroughHandler(errorPassthroughService)
-	adminHandlers := handler.ProvideAdminHandlers(dashboardHandler, adminUserHandler, groupHandler, accountHandler, adminAnnouncementHandler, dataManagementHandler, oAuthHandler, openAIOAuthHandler, geminiOAuthHandler, antigravityOAuthHandler, proxyHandler, adminRedeemHandler, promoHandler, settingHandler, opsHandler, systemHandler, adminSubscriptionHandler, adminUsageHandler, userAttributeHandler, errorPassthroughHandler)
+	adminAPIKeyHandler := admin.NewAdminAPIKeyHandler(adminService)
+	adminHandlers := handler.ProvideAdminHandlers(dashboardHandler, adminUserHandler, groupHandler, accountHandler, adminAnnouncementHandler, dataManagementHandler, oAuthHandler, openAIOAuthHandler, geminiOAuthHandler, antigravityOAuthHandler, proxyHandler, adminRedeemHandler, promoHandler, settingHandler, opsHandler, systemHandler, adminSubscriptionHandler, adminUsageHandler, userAttributeHandler, errorPassthroughHandler, adminAPIKeyHandler)
 	usageRecordWorkerPool := service.NewUsageRecordWorkerPool(configConfig)
 	gatewayHandler := handler.NewGatewayHandler(gatewayService, geminiMessagesCompatService, antigravityGatewayService, userService, concurrencyService, billingCacheService, usageService, apiKeyService, usageRecordWorkerPool, errorPassthroughService, configConfig)
 	openAIGatewayHandler := handler.NewOpenAIGatewayHandler(openAIGatewayService, concurrencyService, billingCacheService, apiKeyService, usageRecordWorkerPool, errorPassthroughService, configConfig)

backend/go.mod

@@ -109,6 +109,7 @@ require (
 	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
+	github.com/google/subcommands v1.2.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/hcl/v2 v2.18.1 // indirect
@@ -177,6 +178,7 @@ require (
 	golang.org/x/mod v0.32.0 // indirect
 	golang.org/x/sys v0.41.0 // indirect
 	golang.org/x/text v0.34.0 // indirect
+	golang.org/x/tools v0.41.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250929231259-57b25ae835d4 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	modernc.org/libc v1.67.6 // indirect

backend/go.sum

@@ -182,6 +182,8 @@ github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
 github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
+github.com/google/subcommands v1.2.0 h1:vWQspBTo2nEqTUFita5/KeEWlUL8kQObDFbub/EN9oE=
+github.com/google/subcommands v1.2.0/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/wire v0.7.0 h1:JxUKI6+CVBgCO2WToKy/nQk0sS+amI9z9EjVmdaocj4=

backend/internal/handler/admin/admin_service_stub_test.go

@@ -403,5 +403,23 @@ func (s *stubAdminService) UpdateGroupSortOrders(ctx context.Context, updates []
 	return nil
 }
 
+func (s *stubAdminService) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*service.AdminUpdateAPIKeyGroupIDResult, error) {
+	for i := range s.apiKeys {
+		if s.apiKeys[i].ID == keyID {
+			k := s.apiKeys[i]
+			if groupID != nil {
+				if *groupID == 0 {
+					k.GroupID = nil
+				} else {
+					gid := *groupID
+					k.GroupID = &gid
+				}
+			}
+			return &service.AdminUpdateAPIKeyGroupIDResult{APIKey: &k}, nil
+		}
+	}
+	return nil, service.ErrAPIKeyNotFound
+}
+
 // Ensure stub implements interface.
 var _ service.AdminService = (*stubAdminService)(nil)

backend/internal/handler/admin/apikey_handler.go

+package admin
+
+import (
+	"strconv"
+
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+// AdminAPIKeyHandler handles admin API key management
+type AdminAPIKeyHandler struct {
+	adminService service.AdminService
+}
+
+// NewAdminAPIKeyHandler creates a new admin API key handler
+func NewAdminAPIKeyHandler(adminService service.AdminService) *AdminAPIKeyHandler {
+	return &AdminAPIKeyHandler{
+		adminService: adminService,
+	}
+}
+
+// AdminUpdateAPIKeyGroupRequest represents the request to update an API key's group
+type AdminUpdateAPIKeyGroupRequest struct {
+	GroupID *int64 `json:"group_id"` // nil=不修改, 0=解绑, >0=绑定到目标分组
+}
+
+// UpdateGroup handles updating an API key's group binding
+// PUT /api/v1/admin/api-keys/:id
+func (h *AdminAPIKeyHandler) UpdateGroup(c *gin.Context) {
+	keyID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid API key ID")
+		return
+	}
+
+	var req AdminUpdateAPIKeyGroupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	result, err := h.adminService.AdminUpdateAPIKeyGroupID(c.Request.Context(), keyID, req.GroupID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	resp := struct {
+		APIKey                 *dto.APIKey `json:"api_key"`
+		AutoGrantedGroupAccess bool        `json:"auto_granted_group_access"`
+		GrantedGroupID         *int64      `json:"granted_group_id,omitempty"`
+		GrantedGroupName       string      `json:"granted_group_name,omitempty"`
+	}{
+		APIKey:                 dto.APIKeyFromService(result.APIKey),
+		AutoGrantedGroupAccess: result.AutoGrantedGroupAccess,
+		GrantedGroupID:         result.GrantedGroupID,
+		GrantedGroupName:       result.GrantedGroupName,
+	}
+	response.Success(c, resp)
+}

backend/internal/handler/admin/apikey_handler_test.go

+package admin
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/gin-gonic/gin"
+	"github.com/stretchr/testify/require"
+)
+
+func setupAPIKeyHandler(adminSvc service.AdminService) *gin.Engine {
+	gin.SetMode(gin.TestMode)
+	router := gin.New()
+	h := NewAdminAPIKeyHandler(adminSvc)
+	router.PUT("/api/v1/admin/api-keys/:id", h.UpdateGroup)
+	return router
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_InvalidID(t *testing.T) {
+	router := setupAPIKeyHandler(newStubAdminService())
+	body := `{"group_id": 2}`
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/abc", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusBadRequest, rec.Code)
+	require.Contains(t, rec.Body.String(), "Invalid API key ID")
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_InvalidJSON(t *testing.T) {
+	router := setupAPIKeyHandler(newStubAdminService())
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(`{bad json`))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusBadRequest, rec.Code)
+	require.Contains(t, rec.Body.String(), "Invalid request")
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_KeyNotFound(t *testing.T) {
+	router := setupAPIKeyHandler(newStubAdminService())
+	body := `{"group_id": 2}`
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/999", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	// ErrAPIKeyNotFound maps to 404
+	require.Equal(t, http.StatusNotFound, rec.Code)
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_BindGroup(t *testing.T) {
+	router := setupAPIKeyHandler(newStubAdminService())
+	body := `{"group_id": 2}`
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	var resp struct {
+		Code int             `json:"code"`
+		Data json.RawMessage `json:"data"`
+	}
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, 0, resp.Code)
+
+	var data struct {
+		APIKey struct {
+			ID      int64  `json:"id"`
+			GroupID *int64 `json:"group_id"`
+		} `json:"api_key"`
+		AutoGrantedGroupAccess bool `json:"auto_granted_group_access"`
+	}
+	require.NoError(t, json.Unmarshal(resp.Data, &data))
+	require.Equal(t, int64(10), data.APIKey.ID)
+	require.NotNil(t, data.APIKey.GroupID)
+	require.Equal(t, int64(2), *data.APIKey.GroupID)
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_Unbind(t *testing.T) {
+	svc := newStubAdminService()
+	gid := int64(2)
+	svc.apiKeys[0].GroupID = &gid
+	router := setupAPIKeyHandler(svc)
+	body := `{"group_id": 0}`
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	var resp struct {
+		Data struct {
+			APIKey struct {
+				GroupID *int64 `json:"group_id"`
+			} `json:"api_key"`
+		} `json:"data"`
+	}
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Nil(t, resp.Data.APIKey.GroupID)
+}
+
+func TestAdminAPIKeyHandler_UpdateGroup_ServiceError(t *testing.T) {
+	svc := &failingUpdateGroupService{
+		stubAdminService: newStubAdminService(),
+		err:              errors.New("internal failure"),
+	}
+	router := setupAPIKeyHandler(svc)
+	body := `{"group_id": 2}`
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(body))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusInternalServerError, rec.Code)
+}
+
+// H2: empty body → group_id is nil → no-op, returns original key
+func TestAdminAPIKeyHandler_UpdateGroup_EmptyBody_NoChange(t *testing.T) {
+	router := setupAPIKeyHandler(newStubAdminService())
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(`{}`))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	var resp struct {
+		Code int `json:"code"`
+		Data struct {
+			APIKey struct {
+				ID int64 `json:"id"`
+			} `json:"api_key"`
+		} `json:"data"`
+	}
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &resp))
+	require.Equal(t, 0, resp.Code)
+	require.Equal(t, int64(10), resp.Data.APIKey.ID)
+}
+
+// M2: service returns GROUP_NOT_ACTIVE → handler maps to 400
+func TestAdminAPIKeyHandler_UpdateGroup_GroupNotActive(t *testing.T) {
+	svc := &failingUpdateGroupService{
+		stubAdminService: newStubAdminService(),
+		err:              infraerrors.BadRequest("GROUP_NOT_ACTIVE", "target group is not active"),
+	}
+	router := setupAPIKeyHandler(svc)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(`{"group_id": 5}`))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusBadRequest, rec.Code)
+	require.Contains(t, rec.Body.String(), "GROUP_NOT_ACTIVE")
+}
+
+// M2: service returns INVALID_GROUP_ID → handler maps to 400
+func TestAdminAPIKeyHandler_UpdateGroup_NegativeGroupID(t *testing.T) {
+	svc := &failingUpdateGroupService{
+		stubAdminService: newStubAdminService(),
+		err:              infraerrors.BadRequest("INVALID_GROUP_ID", "group_id must be non-negative"),
+	}
+	router := setupAPIKeyHandler(svc)
+
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodPut, "/api/v1/admin/api-keys/10", bytes.NewBufferString(`{"group_id": -5}`))
+	req.Header.Set("Content-Type", "application/json")
+	router.ServeHTTP(rec, req)
+
+	require.Equal(t, http.StatusBadRequest, rec.Code)
+	require.Contains(t, rec.Body.String(), "INVALID_GROUP_ID")
+}
+
+// failingUpdateGroupService overrides AdminUpdateAPIKeyGroupID to return an error.
+type failingUpdateGroupService struct {
+	*stubAdminService
+	err error
+}
+
+func (f *failingUpdateGroupService) AdminUpdateAPIKeyGroupID(_ context.Context, _ int64, _ *int64) (*service.AdminUpdateAPIKeyGroupIDResult, error) {
+	return nil, f.err
+}

backend/internal/handler/handler.go

@@ -26,6 +26,7 @@ type AdminHandlers struct {
 	Usage            *admin.UsageHandler
 	UserAttribute    *admin.UserAttributeHandler
 	ErrorPassthrough *admin.ErrorPassthroughHandler
+	APIKey           *admin.AdminAPIKeyHandler
 }
 
 // Handlers contains all HTTP handlers

backend/internal/handler/sora_client_handler_test.go

@@ -945,6 +945,9 @@ func (r *stubUserRepoForHandler) RemoveGroupFromAllowedGroups(context.Context, i
 func (r *stubUserRepoForHandler) UpdateTotpSecret(context.Context, int64, *string) error { return nil }
 func (r *stubUserRepoForHandler) EnableTotp(context.Context, int64) error                { return nil }
 func (r *stubUserRepoForHandler) DisableTotp(context.Context, int64) error               { return nil }
+func (r *stubUserRepoForHandler) AddGroupToAllowedGroups(context.Context, int64, int64) error {
+	return nil
+}
 
 // ==================== NewSoraClientHandler ====================
 

backend/internal/handler/wire.go

@@ -29,6 +29,7 @@ func ProvideAdminHandlers(
 	usageHandler *admin.UsageHandler,
 	userAttributeHandler *admin.UserAttributeHandler,
 	errorPassthroughHandler *admin.ErrorPassthroughHandler,
+	apiKeyHandler *admin.AdminAPIKeyHandler,
 ) *AdminHandlers {
 	return &AdminHandlers{
 		Dashboard:        dashboardHandler,
@@ -51,6 +52,7 @@ func ProvideAdminHandlers(
 		Usage:            usageHandler,
 		UserAttribute:    userAttributeHandler,
 		ErrorPassthrough: errorPassthroughHandler,
+		APIKey:           apiKeyHandler,
 	}
 }
 
@@ -138,6 +140,7 @@ var ProviderSet = wire.NewSet(
 	admin.NewUsageHandler,
 	admin.NewUserAttributeHandler,
 	admin.NewErrorPassthroughHandler,
+	admin.NewAdminAPIKeyHandler,
 
 	// AdminHandlers and Handlers constructors
 	ProvideAdminHandlers,

backend/internal/repository/api_key_repo.go

@@ -171,8 +171,9 @@ func (r *apiKeyRepository) Update(ctx context.Context, key *service.APIKey) erro
 	// 则会更新已删除的记录。
 	// 这里选择 Update().Where()，确保只有未软删除记录能被更新。
 	// 同时显式设置 updated_at，避免二次查询带来的并发可见性问题。
+	client := clientFromContext(ctx, r.client)
 	now := time.Now()
-	builder := r.client.APIKey.Update().
+	builder := client.APIKey.Update().
 		Where(apikey.IDEQ(key.ID), apikey.DeletedAtIsNil()).
 		SetName(key.Name).
 		SetStatus(key.Status).

backend/internal/repository/user_repo.go

@@ -429,6 +429,16 @@ func (r *userRepository) ExistsByEmail(ctx context.Context, email string) (bool,
 	return r.client.User.Query().Where(dbuser.EmailEQ(email)).Exist(ctx)
 }
 
+func (r *userRepository) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	client := clientFromContext(ctx, r.client)
+	return client.UserAllowedGroup.Create().
+		SetUserID(userID).
+		SetGroupID(groupID).
+		OnConflictColumns(userallowedgroup.FieldUserID, userallowedgroup.FieldGroupID).
+		DoNothing().
+		Exec(ctx)
+}
+
 func (r *userRepository) RemoveGroupFromAllowedGroups(ctx context.Context, groupID int64) (int64, error) {
 	// 仅操作 user_allowed_groups 联接表，legacy users.allowed_groups 列已弃用。
 	affected, err := r.client.UserAllowedGroup.Delete().

backend/internal/server/api_contract_test.go

@@ -619,7 +619,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingRepo := newStubSettingRepo()
 	settingService := service.NewSettingService(settingRepo, cfg)
 
-	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, nil, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil)
+	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, nil, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, nil)
 	authHandler := handler.NewAuthHandler(cfg, nil, userService, settingService, nil, redeemService, nil)
 	apiKeyHandler := handler.NewAPIKeyHandler(apiKeyService)
 	usageHandler := handler.NewUsageHandler(usageService, apiKeyService)
@@ -779,6 +779,10 @@ func (r *stubUserRepo) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	return 0, errors.New("not implemented")
 }
 
+func (r *stubUserRepo) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	return errors.New("not implemented")
+}
+
 func (r *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	return errors.New("not implemented")
 }

backend/internal/server/middleware/admin_auth_test.go

@@ -181,6 +181,10 @@ func (s *stubUserRepo) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	panic("unexpected RemoveGroupFromAllowedGroups call")
 }
 
+func (s *stubUserRepo) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	panic("unexpected AddGroupToAllowedGroups call")
+}
+
 func (s *stubUserRepo) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	panic("unexpected UpdateTotpSecret call")
 }

backend/internal/server/routes/admin.go

@@ -75,6 +75,16 @@ func RegisterAdminRoutes(
 
 		// 错误透传规则管理
 		registerErrorPassthroughRoutes(admin, h)
+
+		// API Key 管理
+		registerAdminAPIKeyRoutes(admin, h)
+	}
+}
+
+func registerAdminAPIKeyRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
+	apiKeys := admin.Group("/api-keys")
+	{
+		apiKeys.PUT("/:id", h.Admin.APIKey.UpdateGroup)
 	}
 }
 

backend/internal/service/admin_service.go

@@ -9,6 +9,8 @@ import (
 	"strings"
 	"time"
 
+	dbent "github.com/Wei-Shaw/sub2api/ent"
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/httpclient"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
@@ -42,6 +44,9 @@ type AdminService interface {
 	GetGroupAPIKeys(ctx context.Context, groupID int64, page, pageSize int) ([]APIKey, int64, error)
 	UpdateGroupSortOrders(ctx context.Context, updates []GroupSortOrderUpdate) error
 
+	// API Key management (admin)
+	AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*AdminUpdateAPIKeyGroupIDResult, error)
+
 	// Account management
 	ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string, groupID int64) ([]Account, int64, error)
 	GetAccount(ctx context.Context, id int64) (*Account, error)
@@ -242,6 +247,14 @@ type BulkUpdateAccountResult struct {
 	Error     string `json:"error,omitempty"`
 }
 
+// AdminUpdateAPIKeyGroupIDResult is the result of AdminUpdateAPIKeyGroupID.
+type AdminUpdateAPIKeyGroupIDResult struct {
+	APIKey                 *APIKey
+	AutoGrantedGroupAccess bool   // true if a new exclusive group permission was auto-added
+	GrantedGroupID         *int64 // the group ID that was auto-granted
+	GrantedGroupName       string // the group name that was auto-granted
+}
+
 // BulkUpdateAccountsResult is the aggregated response for bulk updates.
 type BulkUpdateAccountsResult struct {
 	Success    int                       `json:"success"`
@@ -406,6 +419,7 @@ type adminServiceImpl struct {
 	proxyProber          ProxyExitInfoProber
 	proxyLatencyCache    ProxyLatencyCache
 	authCacheInvalidator APIKeyAuthCacheInvalidator
+	entClient            *dbent.Client // 用于开启数据库事务
 }
 
 type userGroupRateBatchReader interface {
@@ -430,6 +444,7 @@ func NewAdminService(
 	proxyProber ProxyExitInfoProber,
 	proxyLatencyCache ProxyLatencyCache,
 	authCacheInvalidator APIKeyAuthCacheInvalidator,
+	entClient *dbent.Client,
 ) AdminService {
 	return &adminServiceImpl{
 		userRepo:             userRepo,
@@ -444,6 +459,7 @@ func NewAdminService(
 		proxyProber:          proxyProber,
 		proxyLatencyCache:    proxyLatencyCache,
 		authCacheInvalidator: authCacheInvalidator,
+		entClient:            entClient,
 	}
 }
 
@@ -1185,6 +1201,103 @@ func (s *adminServiceImpl) UpdateGroupSortOrders(ctx context.Context, updates []
 	return s.groupRepo.UpdateSortOrders(ctx, updates)
 }
 
+// AdminUpdateAPIKeyGroupID 管理员修改 API Key 分组绑定
+// groupID: nil=不修改, 指向0=解绑, 指向正整数=绑定到目标分组
+func (s *adminServiceImpl) AdminUpdateAPIKeyGroupID(ctx context.Context, keyID int64, groupID *int64) (*AdminUpdateAPIKeyGroupIDResult, error) {
+	apiKey, err := s.apiKeyRepo.GetByID(ctx, keyID)
+	if err != nil {
+		return nil, err
+	}
+
+	if groupID == nil {
+		// nil 表示不修改，直接返回
+		return &AdminUpdateAPIKeyGroupIDResult{APIKey: apiKey}, nil
+	}
+
+	if *groupID < 0 {
+		return nil, infraerrors.BadRequest("INVALID_GROUP_ID", "group_id must be non-negative")
+	}
+
+	result := &AdminUpdateAPIKeyGroupIDResult{}
+
+	if *groupID == 0 {
+		// 0 表示解绑分组（不修改 user_allowed_groups，避免影响用户其他 Key）
+		apiKey.GroupID = nil
+		apiKey.Group = nil
+	} else {
+		// 验证目标分组存在且状态为 active
+		group, err := s.groupRepo.GetByID(ctx, *groupID)
+		if err != nil {
+			return nil, err
+		}
+		if group.Status != StatusActive {
+			return nil, infraerrors.BadRequest("GROUP_NOT_ACTIVE", "target group is not active")
+		}
+		// 订阅类型分组：不允许通过此 API 直接绑定，需通过订阅管理流程
+		if group.IsSubscriptionType() {
+			return nil, infraerrors.BadRequest("SUBSCRIPTION_GROUP_NOT_ALLOWED", "subscription groups must be managed through the subscription workflow")
+		}
+
+		gid := *groupID
+		apiKey.GroupID = &gid
+		apiKey.Group = group
+
+		// 专属标准分组：使用事务保证「添加分组权限」与「更新 API Key」的原子性
+		if group.IsExclusive {
+			opCtx := ctx
+			var tx *dbent.Tx
+			if s.entClient == nil {
+				logger.LegacyPrintf("service.admin", "Warning: entClient is nil, skipping transaction protection for exclusive group binding")
+			} else {
+				var txErr error
+				tx, txErr = s.entClient.Tx(ctx)
+				if txErr != nil {
+					return nil, fmt.Errorf("begin transaction: %w", txErr)
+				}
+				defer func() { _ = tx.Rollback() }()
+				opCtx = dbent.NewTxContext(ctx, tx)
+			}
+
+			if addErr := s.userRepo.AddGroupToAllowedGroups(opCtx, apiKey.UserID, gid); addErr != nil {
+				return nil, fmt.Errorf("add group to user allowed groups: %w", addErr)
+			}
+			if err := s.apiKeyRepo.Update(opCtx, apiKey); err != nil {
+				return nil, fmt.Errorf("update api key: %w", err)
+			}
+			if tx != nil {
+				if err := tx.Commit(); err != nil {
+					return nil, fmt.Errorf("commit transaction: %w", err)
+				}
+			}
+
+			result.AutoGrantedGroupAccess = true
+			result.GrantedGroupID = &gid
+			result.GrantedGroupName = group.Name
+
+			// 失效认证缓存（在事务提交后执行）
+			if s.authCacheInvalidator != nil {
+				s.authCacheInvalidator.InvalidateAuthCacheByKey(ctx, apiKey.Key)
+			}
+
+			result.APIKey = apiKey
+			return result, nil
+		}
+	}
+
+	// 非专属分组 / 解绑：无需事务，单步更新即可
+	if err := s.apiKeyRepo.Update(ctx, apiKey); err != nil {
+		return nil, fmt.Errorf("update api key: %w", err)
+	}
+
+	// 失效认证缓存
+	if s.authCacheInvalidator != nil {
+		s.authCacheInvalidator.InvalidateAuthCacheByKey(ctx, apiKey.Key)
+	}
+
+	result.APIKey = apiKey
+	return result, nil
+}
+
 // Account management implementations
 func (s *adminServiceImpl) ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string, groupID int64) ([]Account, int64, error) {
 	params := pagination.PaginationParams{Page: page, PageSize: pageSize}

backend/internal/service/admin_service_apikey_test.go

+//go:build unit
+
+package service
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/stretchr/testify/require"
+)
+
+// ---------------------------------------------------------------------------
+// Stubs
+// ---------------------------------------------------------------------------
+
+// userRepoStubForGroupUpdate implements UserRepository for AdminUpdateAPIKeyGroupID tests.
+type userRepoStubForGroupUpdate struct {
+	addGroupErr    error
+	addGroupCalled bool
+	addedUserID    int64
+	addedGroupID   int64
+}
+
+func (s *userRepoStubForGroupUpdate) AddGroupToAllowedGroups(_ context.Context, userID int64, groupID int64) error {
+	s.addGroupCalled = true
+	s.addedUserID = userID
+	s.addedGroupID = groupID
+	return s.addGroupErr
+}
+
+func (s *userRepoStubForGroupUpdate) Create(context.Context, *User) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetByID(context.Context, int64) (*User, error)      { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetByEmail(context.Context, string) (*User, error)  { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) GetFirstAdmin(context.Context) (*User, error)       { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) Update(context.Context, *User) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) Delete(context.Context, int64) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) List(context.Context, pagination.PaginationParams) ([]User, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) ListWithFilters(context.Context, pagination.PaginationParams, UserListFilters) ([]User, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) UpdateBalance(context.Context, int64, float64) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) DeductBalance(context.Context, int64, float64) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) UpdateConcurrency(context.Context, int64, int) error   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) ExistsByEmail(context.Context, string) (bool, error)   { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) RemoveGroupFromAllowedGroups(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *userRepoStubForGroupUpdate) UpdateTotpSecret(context.Context, int64, *string) error { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) EnableTotp(context.Context, int64) error                { panic("unexpected") }
+func (s *userRepoStubForGroupUpdate) DisableTotp(context.Context, int64) error               { panic("unexpected") }
+
+// apiKeyRepoStubForGroupUpdate implements APIKeyRepository for AdminUpdateAPIKeyGroupID tests.
+type apiKeyRepoStubForGroupUpdate struct {
+	key       *APIKey
+	getErr    error
+	updateErr error
+	updated   *APIKey // captures what was passed to Update
+}
+
+func (s *apiKeyRepoStubForGroupUpdate) GetByID(_ context.Context, _ int64) (*APIKey, error) {
+	if s.getErr != nil {
+		return nil, s.getErr
+	}
+	clone := *s.key
+	return &clone, nil
+}
+func (s *apiKeyRepoStubForGroupUpdate) Update(_ context.Context, key *APIKey) error {
+	if s.updateErr != nil {
+		return s.updateErr
+	}
+	clone := *key
+	s.updated = &clone
+	return nil
+}
+
+// Unused methods – panic on unexpected call.
+func (s *apiKeyRepoStubForGroupUpdate) Create(context.Context, *APIKey) error { panic("unexpected") }
+func (s *apiKeyRepoStubForGroupUpdate) GetKeyAndOwnerID(context.Context, int64) (string, int64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) GetByKey(context.Context, string) (*APIKey, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) GetByKeyForAuth(context.Context, string) (*APIKey, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) Delete(context.Context, int64) error { panic("unexpected") }
+func (s *apiKeyRepoStubForGroupUpdate) ListByUserID(context.Context, int64, pagination.PaginationParams) ([]APIKey, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) VerifyOwnership(context.Context, int64, []int64) ([]int64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) CountByUserID(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) ExistsByKey(context.Context, string) (bool, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) ListByGroupID(context.Context, int64, pagination.PaginationParams) ([]APIKey, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) SearchAPIKeys(context.Context, int64, string, int) ([]APIKey, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) ClearGroupIDByGroupID(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) CountByGroupID(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) ListKeysByUserID(context.Context, int64) ([]string, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) ListKeysByGroupID(context.Context, int64) ([]string, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) IncrementQuotaUsed(context.Context, int64, float64) (float64, error) {
+	panic("unexpected")
+}
+func (s *apiKeyRepoStubForGroupUpdate) UpdateLastUsed(context.Context, int64, time.Time) error {
+	panic("unexpected")
+}
+
+// groupRepoStubForGroupUpdate implements GroupRepository for AdminUpdateAPIKeyGroupID tests.
+type groupRepoStubForGroupUpdate struct {
+	group          *Group
+	getErr         error
+	lastGetByIDArg int64
+}
+
+func (s *groupRepoStubForGroupUpdate) GetByID(_ context.Context, id int64) (*Group, error) {
+	s.lastGetByIDArg = id
+	if s.getErr != nil {
+		return nil, s.getErr
+	}
+	clone := *s.group
+	return &clone, nil
+}
+
+// Unused methods – panic on unexpected call.
+func (s *groupRepoStubForGroupUpdate) Create(context.Context, *Group) error { panic("unexpected") }
+func (s *groupRepoStubForGroupUpdate) GetByIDLite(context.Context, int64) (*Group, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) Update(context.Context, *Group) error { panic("unexpected") }
+func (s *groupRepoStubForGroupUpdate) Delete(context.Context, int64) error  { panic("unexpected") }
+func (s *groupRepoStubForGroupUpdate) DeleteCascade(context.Context, int64) ([]int64, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) List(context.Context, pagination.PaginationParams) ([]Group, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) ListWithFilters(context.Context, pagination.PaginationParams, string, string, string, *bool) ([]Group, *pagination.PaginationResult, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) ListActive(context.Context) ([]Group, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) ListActiveByPlatform(context.Context, string) ([]Group, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) ExistsByName(context.Context, string) (bool, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) GetAccountCount(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) DeleteAccountGroupsByGroupID(context.Context, int64) (int64, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) GetAccountIDsByGroupIDs(context.Context, []int64) ([]int64, error) {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) BindAccountsToGroup(context.Context, int64, []int64) error {
+	panic("unexpected")
+}
+func (s *groupRepoStubForGroupUpdate) UpdateSortOrders(context.Context, []GroupSortOrderUpdate) error {
+	panic("unexpected")
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_KeyNotFound(t *testing.T) {
+	repo := &apiKeyRepoStubForGroupUpdate{getErr: ErrAPIKeyNotFound}
+	svc := &adminServiceImpl{apiKeyRepo: repo}
+
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 999, int64Ptr(1))
+	require.ErrorIs(t, err, ErrAPIKeyNotFound)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_NilGroupID_NoOp(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: int64Ptr(5)}
+	repo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	svc := &adminServiceImpl{apiKeyRepo: repo}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, nil)
+	require.NoError(t, err)
+	require.Equal(t, int64(1), got.APIKey.ID)
+	// Update should NOT have been called (updated stays nil)
+	require.Nil(t, repo.updated)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_Unbind(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: int64Ptr(5), Group: &Group{ID: 5, Name: "Old"}}
+	repo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: repo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(0))
+	require.NoError(t, err)
+	require.Nil(t, got.APIKey.GroupID, "group_id should be nil after unbind")
+	require.Nil(t, got.APIKey.Group, "group object should be nil after unbind")
+	require.NotNil(t, repo.updated, "Update should have been called")
+	require.Nil(t, repo.updated.GroupID)
+	require.Equal(t, []string{"sk-test"}, cache.keys, "cache should be invalidated")
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_BindActiveGroup(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Pro", Status: StatusActive}}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
+	require.Equal(t, int64(10), *apiKeyRepo.updated.GroupID)
+	require.Equal(t, []string{"sk-test"}, cache.keys)
+	// M3: verify correct group ID was passed to repo
+	require.Equal(t, int64(10), groupRepo.lastGetByIDArg)
+	// C1 fix: verify Group object is populated
+	require.NotNil(t, got.APIKey.Group)
+	require.Equal(t, "Pro", got.APIKey.Group.Name)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_SameGroup_Idempotent(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: int64Ptr(10), Group: &Group{ID: 10, Name: "Pro"}}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Pro", Status: StatusActive}}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
+	// Update is still called (current impl doesn't short-circuit on same group)
+	require.NotNil(t, apiKeyRepo.updated)
+	require.Equal(t, []string{"sk-test"}, cache.keys)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_GroupNotFound(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test"}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{getErr: ErrGroupNotFound}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo}
+
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(99))
+	require.ErrorIs(t, err, ErrGroupNotFound)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_GroupNotActive(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test"}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 5, Status: StatusDisabled}}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo}
+
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(5))
+	require.Error(t, err)
+	require.Equal(t, "GROUP_NOT_ACTIVE", infraerrors.Reason(err))
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_UpdateFails(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: int64Ptr(3)}
+	repo := &apiKeyRepoStubForGroupUpdate{key: existing, updateErr: errors.New("db write error")}
+	svc := &adminServiceImpl{apiKeyRepo: repo}
+
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(0))
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "update api key")
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_NegativeGroupID(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test"}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo}
+
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(-5))
+	require.Error(t, err)
+	require.Equal(t, "INVALID_GROUP_ID", infraerrors.Reason(err))
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_PointerIsolation(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Pro", Status: StatusActive}}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, authCacheInvalidator: cache}
+
+	inputGID := int64(10)
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, &inputGID)
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	// Mutating the input pointer must NOT affect the stored value
+	inputGID = 999
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
+	require.Equal(t, int64(10), *apiKeyRepo.updated.GroupID)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_NilCacheInvalidator(t *testing.T) {
+	existing := &APIKey{ID: 1, Key: "sk-test"}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 7, Status: StatusActive}}
+	// authCacheInvalidator is nil – should not panic
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(7))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(7), *got.APIKey.GroupID)
+}
+
+// ---------------------------------------------------------------------------
+// Tests: AllowedGroup auto-sync
+// ---------------------------------------------------------------------------
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_ExclusiveGroup_AddsAllowedGroup(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Exclusive", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	require.Equal(t, int64(10), *got.APIKey.GroupID)
+	// 验证 AddGroupToAllowedGroups 被调用，且参数正确
+	require.True(t, userRepo.addGroupCalled)
+	require.Equal(t, int64(42), userRepo.addedUserID)
+	require.Equal(t, int64(10), userRepo.addedGroupID)
+	// 验证 result 标记了自动授权
+	require.True(t, got.AutoGrantedGroupAccess)
+	require.NotNil(t, got.GrantedGroupID)
+	require.Equal(t, int64(10), *got.GrantedGroupID)
+	require.Equal(t, "Exclusive", got.GrantedGroupName)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_NonExclusiveGroup_NoAllowedGroupUpdate(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Public", Status: StatusActive, IsExclusive: false, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.NoError(t, err)
+	require.NotNil(t, got.APIKey.GroupID)
+	// 非专属分组不触发 AddGroupToAllowedGroups
+	require.False(t, userRepo.addGroupCalled)
+	require.False(t, got.AutoGrantedGroupAccess)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_SubscriptionGroup_Blocked(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Sub", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeSubscription}}
+	userRepo := &userRepoStubForGroupUpdate{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo}
+
+	// 订阅类型分组应被阻止绑定
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.Error(t, err)
+	require.Equal(t, "SUBSCRIPTION_GROUP_NOT_ALLOWED", infraerrors.Reason(err))
+	require.False(t, userRepo.addGroupCalled)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_ExclusiveGroup_AllowedGroupAddFails_ReturnsError(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: nil}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	groupRepo := &groupRepoStubForGroupUpdate{group: &Group{ID: 10, Name: "Exclusive", Status: StatusActive, IsExclusive: true, SubscriptionType: SubscriptionTypeStandard}}
+	userRepo := &userRepoStubForGroupUpdate{addGroupErr: errors.New("db error")}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, groupRepo: groupRepo, userRepo: userRepo}
+
+	// 严格模式：AddGroupToAllowedGroups 失败时，整体操作报错
+	_, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(10))
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "add group to user allowed groups")
+	require.True(t, userRepo.addGroupCalled)
+	// apiKey 不应被更新
+	require.Nil(t, apiKeyRepo.updated)
+}
+
+func TestAdminService_AdminUpdateAPIKeyGroupID_Unbind_NoAllowedGroupUpdate(t *testing.T) {
+	existing := &APIKey{ID: 1, UserID: 42, Key: "sk-test", GroupID: int64Ptr(10), Group: &Group{ID: 10, Name: "Exclusive"}}
+	apiKeyRepo := &apiKeyRepoStubForGroupUpdate{key: existing}
+	userRepo := &userRepoStubForGroupUpdate{}
+	cache := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{apiKeyRepo: apiKeyRepo, userRepo: userRepo, authCacheInvalidator: cache}
+
+	got, err := svc.AdminUpdateAPIKeyGroupID(context.Background(), 1, int64Ptr(0))
+	require.NoError(t, err)
+	require.Nil(t, got.APIKey.GroupID)
+	// 解绑时不修改 allowed_groups
+	require.False(t, userRepo.addGroupCalled)
+	require.False(t, got.AutoGrantedGroupAccess)
+}

backend/internal/service/admin_service_delete_test.go

@@ -93,6 +93,10 @@ func (s *userRepoStub) RemoveGroupFromAllowedGroups(ctx context.Context, groupID
 	panic("unexpected RemoveGroupFromAllowedGroups call")
 }
 
+func (s *userRepoStub) AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error {
+	panic("unexpected AddGroupToAllowedGroups call")
+}
+
 func (s *userRepoStub) UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error {
 	panic("unexpected UpdateTotpSecret call")
 }

backend/internal/service/sora_generation_service_test.go

@@ -165,6 +165,9 @@ func (r *stubUserRepoForQuota) RemoveGroupFromAllowedGroups(context.Context, int
 func (r *stubUserRepoForQuota) UpdateTotpSecret(context.Context, int64, *string) error { return nil }
 func (r *stubUserRepoForQuota) EnableTotp(context.Context, int64) error                { return nil }
 func (r *stubUserRepoForQuota) DisableTotp(context.Context, int64) error               { return nil }
+func (r *stubUserRepoForQuota) AddGroupToAllowedGroups(context.Context, int64, int64) error {
+	return nil
+}
 
 // ==================== 辅助函数：构造带 CDN 缓存的 SoraS3Storage ====================
 

backend/internal/service/user_service.go

@@ -40,6 +40,8 @@ type UserRepository interface {
 	UpdateConcurrency(ctx context.Context, id int64, amount int) error
 	ExistsByEmail(ctx context.Context, email string) (bool, error)
 	RemoveGroupFromAllowedGroups(ctx context.Context, groupID int64) (int64, error)
+	// AddGroupToAllowedGroups 将指定分组增量添加到用户的 allowed_groups（幂等，冲突忽略）
+	AddGroupToAllowedGroups(ctx context.Context, userID int64, groupID int64) error
 
 	// TOTP 双因素认证
 	UpdateTotpSecret(ctx context.Context, userID int64, encryptedSecret *string) error

backend/internal/service/user_service_test.go

@@ -45,7 +45,8 @@ func (m *mockUserRepo) ExistsByEmail(context.Context, string) (bool, error) { re
 func (m *mockUserRepo) RemoveGroupFromAllowedGroups(context.Context, int64) (int64, error) {
 	return 0, nil
 }
-func (m *mockUserRepo) UpdateTotpSecret(context.Context, int64, *string) error { return nil }
+func (m *mockUserRepo) AddGroupToAllowedGroups(context.Context, int64, int64) error { return nil }
+func (m *mockUserRepo) UpdateTotpSecret(context.Context, int64, *string) error      { return nil }
 func (m *mockUserRepo) EnableTotp(context.Context, int64) error                { return nil }
 func (m *mockUserRepo) DisableTotp(context.Context, int64) error               { return nil }