feat(rpm): RPM 限流模块优化

P0:
- rpm_override 嵌入 Auth Cache Snapshot，消除每请求 DB 查询 (snapshot v6→v7)
- 429 RPM 响应返回 Retry-After 头（当前分钟剩余秒数）

P1:
- ClearAll 按钮直连 DELETE API，带 loading 防重复
- 新增 GET /admin/users/:id/rpm-status 管理员 RPM 用量查询端点

优化:
- checkRPM 从级联互斥改为并行取最严，user.rpm_limit 作为全局硬上限始终生效
- Override/Group 变更后自动失效 auth cache
- fail-open 语义不变，Redis 故障不阻塞业务

backend/cmd/server/wire_gen.go

@@ -61,8 +61,9 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	billingCache := repository.NewBillingCache(redisClient)
 	userSubscriptionRepository := repository.NewUserSubscriptionRepository(client)
 	apiKeyRepository := repository.NewAPIKeyRepository(client, db)
-	billingCacheService := service.NewBillingCacheService(billingCache, userRepository, userSubscriptionRepository, apiKeyRepository, configConfig)
+	userRPMCache := repository.NewUserRPMCache(redisClient)
 	userGroupRateRepository := repository.NewUserGroupRateRepository(db)
+	billingCacheService := service.ProvideBillingCacheService(billingCache, userRepository, userSubscriptionRepository, apiKeyRepository, userRPMCache, userGroupRateRepository, configConfig)
 	apiKeyCache := repository.NewAPIKeyCache(redisClient)
 	apiKeyService := service.NewAPIKeyService(apiKeyRepository, userRepository, groupRepository, userSubscriptionRepository, userGroupRateRepository, apiKeyCache, configConfig)
 	apiKeyAuthCacheInvalidator := service.ProvideAPIKeyAuthCacheInvalidator(apiKeyService)
@@ -104,7 +105,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	proxyExitInfoProber := repository.NewProxyExitInfoProber(configConfig)
 	proxyLatencyCache := repository.NewProxyLatencyCache(redisClient)
 	privacyClientFactory := providePrivacyClientFactory()
-	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator, client, settingService, subscriptionService, userSubscriptionRepository, privacyClientFactory)
+	adminService := service.NewAdminService(userRepository, groupRepository, accountRepository, proxyRepository, apiKeyRepository, redeemCodeRepository, userGroupRateRepository, userRPMCache, billingCacheService, proxyExitInfoProber, proxyLatencyCache, apiKeyAuthCacheInvalidator, client, settingService, subscriptionService, userSubscriptionRepository, privacyClientFactory)
 	concurrencyCache := repository.ProvideConcurrencyCache(redisClient, configConfig)
 	concurrencyService := service.ProvideConcurrencyService(concurrencyCache, accountRepository, configConfig)
 	adminUserHandler := admin.NewUserHandler(adminService, concurrencyService)
@@ -137,7 +138,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	tlsFingerprintProfileCache := repository.NewTLSFingerprintProfileCache(redisClient)
 	tlsFingerprintProfileService := service.NewTLSFingerprintProfileService(tlsFingerprintProfileRepository, tlsFingerprintProfileCache)
 	accountUsageService := service.NewAccountUsageService(accountRepository, usageLogRepository, claudeUsageFetcher, geminiQuotaService, antigravityQuotaFetcher, usageCache, identityCache, tlsFingerprintProfileService)
-	oAuthRefreshAPI := service.NewOAuthRefreshAPI(accountRepository, geminiTokenCache)
+	oAuthRefreshAPI := service.ProvideOAuthRefreshAPI(accountRepository, geminiTokenCache)
 	geminiTokenProvider := service.ProvideGeminiTokenProvider(accountRepository, geminiTokenCache, geminiOAuthService, oAuthRefreshAPI)
 	gatewayCache := repository.NewGatewayCache(redisClient)
 	schedulerOutboxRepository := repository.NewSchedulerOutboxRepository(db)
@@ -184,6 +185,15 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	geminiMessagesCompatService := service.NewGeminiMessagesCompatService(accountRepository, groupRepository, gatewayCache, schedulerSnapshotService, geminiTokenProvider, rateLimitService, httpUpstream, antigravityGatewayService, configConfig)
 	opsSystemLogSink := service.ProvideOpsSystemLogSink(opsRepository)
 	opsService := service.NewOpsService(opsRepository, settingRepository, configConfig, accountRepository, userRepository, concurrencyService, gatewayService, openAIGatewayService, geminiMessagesCompatService, antigravityGatewayService, opsSystemLogSink)
+	encryptionKey, err := payment.ProvideEncryptionKey(configConfig)
+	if err != nil {
+		return nil, err
+	}
+	paymentConfigService := service.ProvidePaymentConfigService(client, settingRepository, encryptionKey)
+	registry := payment.ProvideRegistry()
+	defaultLoadBalancer := payment.ProvideDefaultLoadBalancer(client, encryptionKey)
+	paymentService := service.NewPaymentService(client, registry, defaultLoadBalancer, redeemService, subscriptionService, paymentConfigService, userRepository, groupRepository)
+	settingHandler := admin.NewSettingHandler(settingService, emailService, turnstileService, opsService, paymentConfigService, paymentService)
 	opsHandler := admin.NewOpsHandler(opsService)
 	updateCache := repository.NewUpdateCache(redisClient)
 	gitHubReleaseClient := repository.ProvideGitHubReleaseClient(configConfig)
@@ -211,16 +221,6 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	scheduledTestService := service.ProvideScheduledTestService(scheduledTestPlanRepository, scheduledTestResultRepository)
 	scheduledTestHandler := admin.NewScheduledTestHandler(scheduledTestService)
 	channelHandler := admin.NewChannelHandler(channelService, billingService)
-	registry := payment.ProvideRegistry()
-	encryptionKey, err := payment.ProvideEncryptionKey(configConfig)
-	if err != nil {
-		return nil, err
-	}
-	defaultLoadBalancer := payment.ProvideDefaultLoadBalancer(client, encryptionKey)
-	paymentConfigService := service.ProvidePaymentConfigService(client, settingRepository, encryptionKey)
-	paymentService := service.NewPaymentService(client, registry, defaultLoadBalancer, redeemService, subscriptionService, paymentConfigService, userRepository, groupRepository)
-	settingHandler := admin.NewSettingHandler(settingService, emailService, turnstileService, opsService, paymentConfigService, paymentService)
-	paymentOrderExpiryService := service.ProvidePaymentOrderExpiryService(paymentService)
 	paymentHandler := admin.NewPaymentHandler(paymentService, paymentConfigService)
 	adminHandlers := handler.ProvideAdminHandlers(dashboardHandler, adminUserHandler, groupHandler, accountHandler, adminAnnouncementHandler, dataManagementHandler, backupHandler, oAuthHandler, openAIOAuthHandler, geminiOAuthHandler, antigravityOAuthHandler, proxyHandler, adminRedeemHandler, promoHandler, settingHandler, opsHandler, systemHandler, adminSubscriptionHandler, adminUsageHandler, userAttributeHandler, errorPassthroughHandler, tlsFingerprintProfileHandler, adminAPIKeyHandler, scheduledTestHandler, channelHandler, paymentHandler)
 	usageRecordWorkerPool := service.NewUsageRecordWorkerPool(configConfig)
@@ -249,6 +249,7 @@ func initializeApplication(buildInfo handler.BuildInfo) (*Application, error) {
 	accountExpiryService := service.ProvideAccountExpiryService(accountRepository)
 	subscriptionExpiryService := service.ProvideSubscriptionExpiryService(userSubscriptionRepository)
 	scheduledTestRunnerService := service.ProvideScheduledTestRunnerService(scheduledTestPlanRepository, scheduledTestService, accountTestService, rateLimitService, configConfig)
+	paymentOrderExpiryService := service.ProvidePaymentOrderExpiryService(paymentService)
 	v := provideCleanup(client, redisClient, opsMetricsCollector, opsAggregationService, opsAlertEvaluatorService, opsCleanupService, opsScheduledReportService, opsSystemLogSink, schedulerSnapshotService, tokenRefreshService, accountExpiryService, subscriptionExpiryService, usageCleanupService, idempotencyCleanupService, pricingService, emailQueueService, billingCacheService, usageRecordWorkerPool, subscriptionService, oAuthService, openAIOAuthService, geminiOAuthService, antigravityOAuthService, openAIGatewayService, scheduledTestRunnerService, backupService, paymentOrderExpiryService)
 	application := &Application{
 		Server:  httpServer,

backend/cmd/server/wire_gen_test.go

@@ -43,7 +43,7 @@ func TestProvideCleanup_WithMinimalDependencies_NoPanic(t *testing.T) {
 	subscriptionExpirySvc := service.NewSubscriptionExpiryService(nil, time.Second)
 	pricingSvc := service.NewPricingService(cfg, nil)
 	emailQueueSvc := service.NewEmailQueueService(nil, 1)
-	billingCacheSvc := service.NewBillingCacheService(nil, nil, nil, nil, cfg)
+	billingCacheSvc := service.NewBillingCacheService(nil, nil, nil, nil, nil, nil, cfg)
 	idempotencyCleanupSvc := service.NewIdempotencyCleanupService(nil, cfg)
 	schedulerSnapshotSvc := service.NewSchedulerSnapshotService(nil, nil, nil, nil, cfg)
 	opsSystemLogSinkSvc := service.NewOpsSystemLogSink(nil)

backend/ent/group.go

@@ -79,6 +79,8 @@ type Group struct {
 	DefaultMappedModel string `json:"default_mapped_model,omitempty"`
 	// OpenAI Messages 调度模型配置：按 Claude 系列/精确模型映射到目标 GPT 模型
 	MessagesDispatchModelConfig domain.OpenAIMessagesDispatchModelConfig `json:"messages_dispatch_model_config,omitempty"`
+	// 分组 RPM 上限，0 表示不限制；设置后接管该分组用户的限流
+	RpmLimit int `json:"rpm_limit,omitempty"`
 	// Edges holds the relations/edges for other nodes in the graph.
 	// The values are being populated by the GroupQuery when eager-loading is set.
 	Edges        GroupEdges `json:"edges"`
@@ -191,7 +193,7 @@ func (*Group) scanValues(columns []string) ([]any, error) {
 			values[i] = new(sql.NullBool)
 		case group.FieldRateMultiplier, group.FieldDailyLimitUsd, group.FieldWeeklyLimitUsd, group.FieldMonthlyLimitUsd, group.FieldImagePrice1k, group.FieldImagePrice2k, group.FieldImagePrice4k:
 			values[i] = new(sql.NullFloat64)
-		case group.FieldID, group.FieldDefaultValidityDays, group.FieldFallbackGroupID, group.FieldFallbackGroupIDOnInvalidRequest, group.FieldSortOrder:
+		case group.FieldID, group.FieldDefaultValidityDays, group.FieldFallbackGroupID, group.FieldFallbackGroupIDOnInvalidRequest, group.FieldSortOrder, group.FieldRpmLimit:
 			values[i] = new(sql.NullInt64)
 		case group.FieldName, group.FieldDescription, group.FieldStatus, group.FieldPlatform, group.FieldSubscriptionType, group.FieldDefaultMappedModel:
 			values[i] = new(sql.NullString)
@@ -414,6 +416,12 @@ func (_m *Group) assignValues(columns []string, values []any) error {
 					return fmt.Errorf("unmarshal field messages_dispatch_model_config: %w", err)
 				}
 			}
+		case group.FieldRpmLimit:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for field rpm_limit", values[i])
+			} else if value.Valid {
+				_m.RpmLimit = int(value.Int64)
+			}
 		default:
 			_m.selectValues.Set(columns[i], values[i])
 		}
@@ -599,6 +607,9 @@ func (_m *Group) String() string {
 	builder.WriteString(", ")
 	builder.WriteString("messages_dispatch_model_config=")
 	builder.WriteString(fmt.Sprintf("%v", _m.MessagesDispatchModelConfig))
+	builder.WriteString(", ")
+	builder.WriteString("rpm_limit=")
+	builder.WriteString(fmt.Sprintf("%v", _m.RpmLimit))
 	builder.WriteByte(')')
 	return builder.String()
 }

backend/ent/group/group.go

@@ -76,6 +76,8 @@ const (
 	FieldDefaultMappedModel = "default_mapped_model"
 	// FieldMessagesDispatchModelConfig holds the string denoting the messages_dispatch_model_config field in the database.
 	FieldMessagesDispatchModelConfig = "messages_dispatch_model_config"
+	// FieldRpmLimit holds the string denoting the rpm_limit field in the database.
+	FieldRpmLimit = "rpm_limit"
 	// EdgeAPIKeys holds the string denoting the api_keys edge name in mutations.
 	EdgeAPIKeys = "api_keys"
 	// EdgeRedeemCodes holds the string denoting the redeem_codes edge name in mutations.
@@ -181,6 +183,7 @@ var Columns = []string{
 	FieldRequirePrivacySet,
 	FieldDefaultMappedModel,
 	FieldMessagesDispatchModelConfig,
+	FieldRpmLimit,
 }
 
 var (
@@ -258,6 +261,8 @@ var (
 	DefaultMappedModelValidator func(string) error
 	// DefaultMessagesDispatchModelConfig holds the default value on creation for the "messages_dispatch_model_config" field.
 	DefaultMessagesDispatchModelConfig domain.OpenAIMessagesDispatchModelConfig
+	// DefaultRpmLimit holds the default value on creation for the "rpm_limit" field.
+	DefaultRpmLimit int
 )
 
 // OrderOption defines the ordering options for the Group queries.
@@ -403,6 +408,11 @@ func ByDefaultMappedModel(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldDefaultMappedModel, opts...).ToFunc()
 }
 
+// ByRpmLimit orders the results by the rpm_limit field.
+func ByRpmLimit(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldRpmLimit, opts...).ToFunc()
+}
+
 // ByAPIKeysCount orders the results by api_keys count.
 func ByAPIKeysCount(opts ...sql.OrderTermOption) OrderOption {
 	return func(s *sql.Selector) {

backend/ent/group/where.go

@@ -190,6 +190,11 @@ func DefaultMappedModel(v string) predicate.Group {
 	return predicate.Group(sql.FieldEQ(FieldDefaultMappedModel, v))
 }
 
+// RpmLimit applies equality check predicate on the "rpm_limit" field. It's identical to RpmLimitEQ.
+func RpmLimit(v int) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldRpmLimit, v))
+}
+
 // CreatedAtEQ applies the EQ predicate on the "created_at" field.
 func CreatedAtEQ(v time.Time) predicate.Group {
 	return predicate.Group(sql.FieldEQ(FieldCreatedAt, v))
@@ -1320,6 +1325,46 @@ func DefaultMappedModelContainsFold(v string) predicate.Group {
 	return predicate.Group(sql.FieldContainsFold(FieldDefaultMappedModel, v))
 }
 
+// RpmLimitEQ applies the EQ predicate on the "rpm_limit" field.
+func RpmLimitEQ(v int) predicate.Group {
+	return predicate.Group(sql.FieldEQ(FieldRpmLimit, v))
+}
+
+// RpmLimitNEQ applies the NEQ predicate on the "rpm_limit" field.
+func RpmLimitNEQ(v int) predicate.Group {
+	return predicate.Group(sql.FieldNEQ(FieldRpmLimit, v))
+}
+
+// RpmLimitIn applies the In predicate on the "rpm_limit" field.
+func RpmLimitIn(vs ...int) predicate.Group {
+	return predicate.Group(sql.FieldIn(FieldRpmLimit, vs...))
+}
+
+// RpmLimitNotIn applies the NotIn predicate on the "rpm_limit" field.
+func RpmLimitNotIn(vs ...int) predicate.Group {
+	return predicate.Group(sql.FieldNotIn(FieldRpmLimit, vs...))
+}
+
+// RpmLimitGT applies the GT predicate on the "rpm_limit" field.
+func RpmLimitGT(v int) predicate.Group {
+	return predicate.Group(sql.FieldGT(FieldRpmLimit, v))
+}
+
+// RpmLimitGTE applies the GTE predicate on the "rpm_limit" field.
+func RpmLimitGTE(v int) predicate.Group {
+	return predicate.Group(sql.FieldGTE(FieldRpmLimit, v))
+}
+
+// RpmLimitLT applies the LT predicate on the "rpm_limit" field.
+func RpmLimitLT(v int) predicate.Group {
+	return predicate.Group(sql.FieldLT(FieldRpmLimit, v))
+}
+
+// RpmLimitLTE applies the LTE predicate on the "rpm_limit" field.
+func RpmLimitLTE(v int) predicate.Group {
+	return predicate.Group(sql.FieldLTE(FieldRpmLimit, v))
+}
+
 // HasAPIKeys applies the HasEdge predicate on the "api_keys" edge.
 func HasAPIKeys() predicate.Group {
 	return predicate.Group(func(s *sql.Selector) {

backend/ent/group_create.go

@@ -425,6 +425,20 @@ func (_c *GroupCreate) SetNillableMessagesDispatchModelConfig(v *domain.OpenAIMe
 	return _c
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_c *GroupCreate) SetRpmLimit(v int) *GroupCreate {
+	_c.mutation.SetRpmLimit(v)
+	return _c
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_c *GroupCreate) SetNillableRpmLimit(v *int) *GroupCreate {
+	if v != nil {
+		_c.SetRpmLimit(*v)
+	}
+	return _c
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_c *GroupCreate) AddAPIKeyIDs(ids ...int64) *GroupCreate {
 	_c.mutation.AddAPIKeyIDs(ids...)
@@ -630,6 +644,10 @@ func (_c *GroupCreate) defaults() error {
 		v := group.DefaultMessagesDispatchModelConfig
 		_c.mutation.SetMessagesDispatchModelConfig(v)
 	}
+	if _, ok := _c.mutation.RpmLimit(); !ok {
+		v := group.DefaultRpmLimit
+		_c.mutation.SetRpmLimit(v)
+	}
 	return nil
 }
 
@@ -717,6 +735,9 @@ func (_c *GroupCreate) check() error {
 	if _, ok := _c.mutation.MessagesDispatchModelConfig(); !ok {
 		return &ValidationError{Name: "messages_dispatch_model_config", err: errors.New(`ent: missing required field "Group.messages_dispatch_model_config"`)}
 	}
+	if _, ok := _c.mutation.RpmLimit(); !ok {
+		return &ValidationError{Name: "rpm_limit", err: errors.New(`ent: missing required field "Group.rpm_limit"`)}
+	}
 	return nil
 }
 
@@ -864,6 +885,10 @@ func (_c *GroupCreate) createSpec() (*Group, *sqlgraph.CreateSpec) {
 		_spec.SetField(group.FieldMessagesDispatchModelConfig, field.TypeJSON, value)
 		_node.MessagesDispatchModelConfig = value
 	}
+	if value, ok := _c.mutation.RpmLimit(); ok {
+		_spec.SetField(group.FieldRpmLimit, field.TypeInt, value)
+		_node.RpmLimit = value
+	}
 	if nodes := _c.mutation.APIKeysIDs(); len(nodes) > 0 {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1500,6 +1525,24 @@ func (u *GroupUpsert) UpdateMessagesDispatchModelConfig() *GroupUpsert {
 	return u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *GroupUpsert) SetRpmLimit(v int) *GroupUpsert {
+	u.Set(group.FieldRpmLimit, v)
+	return u
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *GroupUpsert) UpdateRpmLimit() *GroupUpsert {
+	u.SetExcluded(group.FieldRpmLimit)
+	return u
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *GroupUpsert) AddRpmLimit(v int) *GroupUpsert {
+	u.Add(group.FieldRpmLimit, v)
+	return u
+}
+
 // UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
@@ -2105,6 +2148,27 @@ func (u *GroupUpsertOne) UpdateMessagesDispatchModelConfig() *GroupUpsertOne {
 	})
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *GroupUpsertOne) SetRpmLimit(v int) *GroupUpsertOne {
+	return u.Update(func(s *GroupUpsert) {
+		s.SetRpmLimit(v)
+	})
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *GroupUpsertOne) AddRpmLimit(v int) *GroupUpsertOne {
+	return u.Update(func(s *GroupUpsert) {
+		s.AddRpmLimit(v)
+	})
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *GroupUpsertOne) UpdateRpmLimit() *GroupUpsertOne {
+	return u.Update(func(s *GroupUpsert) {
+		s.UpdateRpmLimit()
+	})
+}
+
 // Exec executes the query.
 func (u *GroupUpsertOne) Exec(ctx context.Context) error {
 	if len(u.create.conflict) == 0 {
@@ -2876,6 +2940,27 @@ func (u *GroupUpsertBulk) UpdateMessagesDispatchModelConfig() *GroupUpsertBulk {
 	})
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *GroupUpsertBulk) SetRpmLimit(v int) *GroupUpsertBulk {
+	return u.Update(func(s *GroupUpsert) {
+		s.SetRpmLimit(v)
+	})
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *GroupUpsertBulk) AddRpmLimit(v int) *GroupUpsertBulk {
+	return u.Update(func(s *GroupUpsert) {
+		s.AddRpmLimit(v)
+	})
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *GroupUpsertBulk) UpdateRpmLimit() *GroupUpsertBulk {
+	return u.Update(func(s *GroupUpsert) {
+		s.UpdateRpmLimit()
+	})
+}
+
 // Exec executes the query.
 func (u *GroupUpsertBulk) Exec(ctx context.Context) error {
 	if u.create.err != nil {

backend/ent/group_update.go

@@ -567,6 +567,27 @@ func (_u *GroupUpdate) SetNillableMessagesDispatchModelConfig(v *domain.OpenAIMe
 	return _u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_u *GroupUpdate) SetRpmLimit(v int) *GroupUpdate {
+	_u.mutation.ResetRpmLimit()
+	_u.mutation.SetRpmLimit(v)
+	return _u
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_u *GroupUpdate) SetNillableRpmLimit(v *int) *GroupUpdate {
+	if v != nil {
+		_u.SetRpmLimit(*v)
+	}
+	return _u
+}
+
+// AddRpmLimit adds value to the "rpm_limit" field.
+func (_u *GroupUpdate) AddRpmLimit(v int) *GroupUpdate {
+	_u.mutation.AddRpmLimit(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *GroupUpdate) AddAPIKeyIDs(ids ...int64) *GroupUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -1030,6 +1051,12 @@ func (_u *GroupUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.MessagesDispatchModelConfig(); ok {
 		_spec.SetField(group.FieldMessagesDispatchModelConfig, field.TypeJSON, value)
 	}
+	if value, ok := _u.mutation.RpmLimit(); ok {
+		_spec.SetField(group.FieldRpmLimit, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedRpmLimit(); ok {
+		_spec.AddField(group.FieldRpmLimit, field.TypeInt, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1875,6 +1902,27 @@ func (_u *GroupUpdateOne) SetNillableMessagesDispatchModelConfig(v *domain.OpenA
 	return _u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_u *GroupUpdateOne) SetRpmLimit(v int) *GroupUpdateOne {
+	_u.mutation.ResetRpmLimit()
+	_u.mutation.SetRpmLimit(v)
+	return _u
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_u *GroupUpdateOne) SetNillableRpmLimit(v *int) *GroupUpdateOne {
+	if v != nil {
+		_u.SetRpmLimit(*v)
+	}
+	return _u
+}
+
+// AddRpmLimit adds value to the "rpm_limit" field.
+func (_u *GroupUpdateOne) AddRpmLimit(v int) *GroupUpdateOne {
+	_u.mutation.AddRpmLimit(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *GroupUpdateOne) AddAPIKeyIDs(ids ...int64) *GroupUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -2368,6 +2416,12 @@ func (_u *GroupUpdateOne) sqlSave(ctx context.Context) (_node *Group, err error)
 	if value, ok := _u.mutation.MessagesDispatchModelConfig(); ok {
 		_spec.SetField(group.FieldMessagesDispatchModelConfig, field.TypeJSON, value)
 	}
+	if value, ok := _u.mutation.RpmLimit(); ok {
+		_spec.SetField(group.FieldRpmLimit, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedRpmLimit(); ok {
+		_spec.AddField(group.FieldRpmLimit, field.TypeInt, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,

backend/ent/migrate/schema.go

@@ -491,6 +491,7 @@ var (
 		{Name: "require_privacy_set", Type: field.TypeBool, Default: false},
 		{Name: "default_mapped_model", Type: field.TypeString, Size: 100, Default: ""},
 		{Name: "messages_dispatch_model_config", Type: field.TypeJSON, SchemaType: map[string]string{"postgres": "jsonb"}},
+		{Name: "rpm_limit", Type: field.TypeInt, Default: 0},
 	}
 	// GroupsTable holds the schema information for the "groups" table.
 	GroupsTable = &schema.Table{
@@ -1276,7 +1277,7 @@ var (
 		{Name: "totp_secret_encrypted", Type: field.TypeString, Nullable: true, SchemaType: map[string]string{"postgres": "text"}},
 		{Name: "totp_enabled", Type: field.TypeBool, Default: false},
 		{Name: "totp_enabled_at", Type: field.TypeTime, Nullable: true},
-		{Name: "signup_source", Type: field.TypeString, Size: 20, Default: "email"},
+		{Name: "signup_source", Type: field.TypeString, Default: "email"},
 		{Name: "last_login_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "last_active_at", Type: field.TypeTime, Nullable: true, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "balance_notify_enabled", Type: field.TypeBool, Default: true},
@@ -1284,6 +1285,7 @@ var (
 		{Name: "balance_notify_threshold", Type: field.TypeFloat64, Nullable: true, SchemaType: map[string]string{"postgres": "decimal(20,8)"}},
 		{Name: "balance_notify_extra_emails", Type: field.TypeString, Default: "[]", SchemaType: map[string]string{"postgres": "text"}},
 		{Name: "total_recharged", Type: field.TypeFloat64, Default: 0, SchemaType: map[string]string{"postgres": "decimal(20,8)"}},
+		{Name: "rpm_limit", Type: field.TypeInt, Default: 0},
 	}
 	// UsersTable holds the schema information for the "users" table.
 	UsersTable = &schema.Table{

backend/ent/mutation.go

@@ -10102,6 +10102,8 @@ type GroupMutation struct {
 	require_privacy_set                     *bool
 	default_mapped_model                    *string
 	messages_dispatch_model_config          *domain.OpenAIMessagesDispatchModelConfig
+	rpm_limit                               *int
+	addrpm_limit                            *int
 	clearedFields                           map[string]struct{}
 	api_keys                                map[int64]struct{}
 	removedapi_keys                         map[int64]struct{}
@@ -11690,6 +11692,62 @@ func (m *GroupMutation) ResetMessagesDispatchModelConfig() {
 	m.messages_dispatch_model_config = nil
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (m *GroupMutation) SetRpmLimit(i int) {
+	m.rpm_limit = &i
+	m.addrpm_limit = nil
+}
+
+// RpmLimit returns the value of the "rpm_limit" field in the mutation.
+func (m *GroupMutation) RpmLimit() (r int, exists bool) {
+	v := m.rpm_limit
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldRpmLimit returns the old "rpm_limit" field's value of the Group entity.
+// If the Group object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *GroupMutation) OldRpmLimit(ctx context.Context) (v int, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldRpmLimit is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldRpmLimit requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldRpmLimit: %w", err)
+	}
+	return oldValue.RpmLimit, nil
+}
+
+// AddRpmLimit adds i to the "rpm_limit" field.
+func (m *GroupMutation) AddRpmLimit(i int) {
+	if m.addrpm_limit != nil {
+		*m.addrpm_limit += i
+	} else {
+		m.addrpm_limit = &i
+	}
+}
+
+// AddedRpmLimit returns the value that was added to the "rpm_limit" field in this mutation.
+func (m *GroupMutation) AddedRpmLimit() (r int, exists bool) {
+	v := m.addrpm_limit
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetRpmLimit resets all changes to the "rpm_limit" field.
+func (m *GroupMutation) ResetRpmLimit() {
+	m.rpm_limit = nil
+	m.addrpm_limit = nil
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by ids.
 func (m *GroupMutation) AddAPIKeyIDs(ids ...int64) {
 	if m.api_keys == nil {
@@ -12048,7 +12106,7 @@ func (m *GroupMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *GroupMutation) Fields() []string {
-	fields := make([]string, 0, 30)
+	fields := make([]string, 0, 31)
 	if m.created_at != nil {
 		fields = append(fields, group.FieldCreatedAt)
 	}
@@ -12139,6 +12197,9 @@ func (m *GroupMutation) Fields() []string {
 	if m.messages_dispatch_model_config != nil {
 		fields = append(fields, group.FieldMessagesDispatchModelConfig)
 	}
+	if m.rpm_limit != nil {
+		fields = append(fields, group.FieldRpmLimit)
+	}
 	return fields
 }
 
@@ -12207,6 +12268,8 @@ func (m *GroupMutation) Field(name string) (ent.Value, bool) {
 		return m.DefaultMappedModel()
 	case group.FieldMessagesDispatchModelConfig:
 		return m.MessagesDispatchModelConfig()
+	case group.FieldRpmLimit:
+		return m.RpmLimit()
 	}
 	return nil, false
 }
@@ -12276,6 +12339,8 @@ func (m *GroupMutation) OldField(ctx context.Context, name string) (ent.Value, e
 		return m.OldDefaultMappedModel(ctx)
 	case group.FieldMessagesDispatchModelConfig:
 		return m.OldMessagesDispatchModelConfig(ctx)
+	case group.FieldRpmLimit:
+		return m.OldRpmLimit(ctx)
 	}
 	return nil, fmt.Errorf("unknown Group field %s", name)
 }
@@ -12495,6 +12560,13 @@ func (m *GroupMutation) SetField(name string, value ent.Value) error {
 		}
 		m.SetMessagesDispatchModelConfig(v)
 		return nil
+	case group.FieldRpmLimit:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetRpmLimit(v)
+		return nil
 	}
 	return fmt.Errorf("unknown Group field %s", name)
 }
@@ -12536,6 +12608,9 @@ func (m *GroupMutation) AddedFields() []string {
 	if m.addsort_order != nil {
 		fields = append(fields, group.FieldSortOrder)
 	}
+	if m.addrpm_limit != nil {
+		fields = append(fields, group.FieldRpmLimit)
+	}
 	return fields
 }
 
@@ -12566,6 +12641,8 @@ func (m *GroupMutation) AddedField(name string) (ent.Value, bool) {
 		return m.AddedFallbackGroupIDOnInvalidRequest()
 	case group.FieldSortOrder:
 		return m.AddedSortOrder()
+	case group.FieldRpmLimit:
+		return m.AddedRpmLimit()
 	}
 	return nil, false
 }
@@ -12652,6 +12729,13 @@ func (m *GroupMutation) AddField(name string, value ent.Value) error {
 		}
 		m.AddSortOrder(v)
 		return nil
+	case group.FieldRpmLimit:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.AddRpmLimit(v)
+		return nil
 	}
 	return fmt.Errorf("unknown Group numeric field %s", name)
 }
@@ -12838,6 +12922,9 @@ func (m *GroupMutation) ResetField(name string) error {
 	case group.FieldMessagesDispatchModelConfig:
 		m.ResetMessagesDispatchModelConfig()
 		return nil
+	case group.FieldRpmLimit:
+		m.ResetRpmLimit()
+		return nil
 	}
 	return fmt.Errorf("unknown Group field %s", name)
 }
@@ -32681,6 +32768,8 @@ type UserMutation struct {
 	balance_notify_extra_emails   *string
 	total_recharged               *float64
 	addtotal_recharged            *float64
+	rpm_limit                     *int
+	addrpm_limit                  *int
 	clearedFields                 map[string]struct{}
 	api_keys                      map[int64]struct{}
 	removedapi_keys               map[int64]struct{}
@@ -33772,6 +33861,62 @@ func (m *UserMutation) ResetTotalRecharged() {
 	m.addtotal_recharged = nil
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (m *UserMutation) SetRpmLimit(i int) {
+	m.rpm_limit = &i
+	m.addrpm_limit = nil
+}
+
+// RpmLimit returns the value of the "rpm_limit" field in the mutation.
+func (m *UserMutation) RpmLimit() (r int, exists bool) {
+	v := m.rpm_limit
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldRpmLimit returns the old "rpm_limit" field's value of the User entity.
+// If the User object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *UserMutation) OldRpmLimit(ctx context.Context) (v int, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldRpmLimit is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldRpmLimit requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldRpmLimit: %w", err)
+	}
+	return oldValue.RpmLimit, nil
+}
+
+// AddRpmLimit adds i to the "rpm_limit" field.
+func (m *UserMutation) AddRpmLimit(i int) {
+	if m.addrpm_limit != nil {
+		*m.addrpm_limit += i
+	} else {
+		m.addrpm_limit = &i
+	}
+}
+
+// AddedRpmLimit returns the value that was added to the "rpm_limit" field in this mutation.
+func (m *UserMutation) AddedRpmLimit() (r int, exists bool) {
+	v := m.addrpm_limit
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// ResetRpmLimit resets all changes to the "rpm_limit" field.
+func (m *UserMutation) ResetRpmLimit() {
+	m.rpm_limit = nil
+	m.addrpm_limit = nil
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by ids.
 func (m *UserMutation) AddAPIKeyIDs(ids ...int64) {
 	if m.api_keys == nil {
@@ -34454,7 +34599,7 @@ func (m *UserMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *UserMutation) Fields() []string {
-	fields := make([]string, 0, 22)
+	fields := make([]string, 0, 23)
 	if m.created_at != nil {
 		fields = append(fields, user.FieldCreatedAt)
 	}
@@ -34521,6 +34666,9 @@ func (m *UserMutation) Fields() []string {
 	if m.total_recharged != nil {
 		fields = append(fields, user.FieldTotalRecharged)
 	}
+	if m.rpm_limit != nil {
+		fields = append(fields, user.FieldRpmLimit)
+	}
 	return fields
 }
 
@@ -34573,6 +34721,8 @@ func (m *UserMutation) Field(name string) (ent.Value, bool) {
 		return m.BalanceNotifyExtraEmails()
 	case user.FieldTotalRecharged:
 		return m.TotalRecharged()
+	case user.FieldRpmLimit:
+		return m.RpmLimit()
 	}
 	return nil, false
 }
@@ -34626,6 +34776,8 @@ func (m *UserMutation) OldField(ctx context.Context, name string) (ent.Value, er
 		return m.OldBalanceNotifyExtraEmails(ctx)
 	case user.FieldTotalRecharged:
 		return m.OldTotalRecharged(ctx)
+	case user.FieldRpmLimit:
+		return m.OldRpmLimit(ctx)
 	}
 	return nil, fmt.Errorf("unknown User field %s", name)
 }
@@ -34789,6 +34941,13 @@ func (m *UserMutation) SetField(name string, value ent.Value) error {
 		}
 		m.SetTotalRecharged(v)
 		return nil
+	case user.FieldRpmLimit:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetRpmLimit(v)
+		return nil
 	}
 	return fmt.Errorf("unknown User field %s", name)
 }
@@ -34809,6 +34968,9 @@ func (m *UserMutation) AddedFields() []string {
 	if m.addtotal_recharged != nil {
 		fields = append(fields, user.FieldTotalRecharged)
 	}
+	if m.addrpm_limit != nil {
+		fields = append(fields, user.FieldRpmLimit)
+	}
 	return fields
 }
 
@@ -34825,6 +34987,8 @@ func (m *UserMutation) AddedField(name string) (ent.Value, bool) {
 		return m.AddedBalanceNotifyThreshold()
 	case user.FieldTotalRecharged:
 		return m.AddedTotalRecharged()
+	case user.FieldRpmLimit:
+		return m.AddedRpmLimit()
 	}
 	return nil, false
 }
@@ -34862,6 +35026,13 @@ func (m *UserMutation) AddField(name string, value ent.Value) error {
 		}
 		m.AddTotalRecharged(v)
 		return nil
+	case user.FieldRpmLimit:
+		v, ok := value.(int)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.AddRpmLimit(v)
+		return nil
 	}
 	return fmt.Errorf("unknown User numeric field %s", name)
 }
@@ -34994,6 +35165,9 @@ func (m *UserMutation) ResetField(name string) error {
 	case user.FieldTotalRecharged:
 		m.ResetTotalRecharged()
 		return nil
+	case user.FieldRpmLimit:
+		m.ResetRpmLimit()
+		return nil
 	}
 	return fmt.Errorf("unknown User field %s", name)
 }

backend/ent/runtime/runtime.go

@@ -595,6 +595,10 @@ func init() {
 	groupDescMessagesDispatchModelConfig := groupFields[26].Descriptor()
 	// group.DefaultMessagesDispatchModelConfig holds the default value on creation for the messages_dispatch_model_config field.
 	group.DefaultMessagesDispatchModelConfig = groupDescMessagesDispatchModelConfig.Default.(domain.OpenAIMessagesDispatchModelConfig)
+	// groupDescRpmLimit is the schema descriptor for rpm_limit field.
+	groupDescRpmLimit := groupFields[27].Descriptor()
+	// group.DefaultRpmLimit holds the default value on creation for the rpm_limit field.
+	group.DefaultRpmLimit = groupDescRpmLimit.Default.(int)
 	idempotencyrecordMixin := schema.IdempotencyRecord{}.Mixin()
 	idempotencyrecordMixinFields0 := idempotencyrecordMixin[0].Fields()
 	_ = idempotencyrecordMixinFields0
@@ -1575,6 +1579,10 @@ func init() {
 	userDescTotalRecharged := userFields[18].Descriptor()
 	// user.DefaultTotalRecharged holds the default value on creation for the total_recharged field.
 	user.DefaultTotalRecharged = userDescTotalRecharged.Default.(float64)
+	// userDescRpmLimit is the schema descriptor for rpm_limit field.
+	userDescRpmLimit := userFields[19].Descriptor()
+	// user.DefaultRpmLimit holds the default value on creation for the rpm_limit field.
+	user.DefaultRpmLimit = userDescRpmLimit.Default.(int)
 	userallowedgroupFields := schema.UserAllowedGroup{}.Fields()
 	_ = userallowedgroupFields
 	// userallowedgroupDescCreatedAt is the schema descriptor for created_at field.

backend/ent/schema/group.go

@@ -145,6 +145,11 @@ func (Group) Fields() []ent.Field {
 			Default(domain.OpenAIMessagesDispatchModelConfig{}).
 			SchemaType(map[string]string{dialect.Postgres: "jsonb"}).
 			Comment("OpenAI Messages 调度模型配置：按 Claude 系列/精确模型映射到目标 GPT 模型"),
+
+		// 分组级每分钟请求数上限（0 = 不限制）。设置后优先于用户级兜底生效。
+		field.Int("rpm_limit").
+			Default(0).
+			Comment("分组 RPM 上限，0 表示不限制；设置后接管该分组用户的限流"),
 	}
 }
 

backend/ent/schema/user.go

@@ -108,6 +108,10 @@ func (User) Fields() []ent.Field {
 		field.Float("total_recharged").
 			SchemaType(map[string]string{dialect.Postgres: "decimal(20,8)"}).
 			Default(0),
+
+		// 用户级每分钟请求数上限（0 = 不限制）。仅当所在分组未设置 rpm_limit 时作为兜底生效。
+		field.Int("rpm_limit").
+			Default(0),
 	}
 }
 

backend/ent/user.go

@@ -61,6 +61,8 @@ type User struct {
 	BalanceNotifyExtraEmails string `json:"balance_notify_extra_emails,omitempty"`
 	// TotalRecharged holds the value of the "total_recharged" field.
 	TotalRecharged float64 `json:"total_recharged,omitempty"`
+	// RpmLimit holds the value of the "rpm_limit" field.
+	RpmLimit int `json:"rpm_limit,omitempty"`
 	// Edges holds the relations/edges for other nodes in the graph.
 	// The values are being populated by the UserQuery when eager-loading is set.
 	Edges        UserEdges `json:"edges"`
@@ -226,7 +228,7 @@ func (*User) scanValues(columns []string) ([]any, error) {
 			values[i] = new(sql.NullBool)
 		case user.FieldBalance, user.FieldBalanceNotifyThreshold, user.FieldTotalRecharged:
 			values[i] = new(sql.NullFloat64)
-		case user.FieldID, user.FieldConcurrency:
+		case user.FieldID, user.FieldConcurrency, user.FieldRpmLimit:
 			values[i] = new(sql.NullInt64)
 		case user.FieldEmail, user.FieldPasswordHash, user.FieldRole, user.FieldStatus, user.FieldUsername, user.FieldNotes, user.FieldTotpSecretEncrypted, user.FieldSignupSource, user.FieldBalanceNotifyThresholdType, user.FieldBalanceNotifyExtraEmails:
 			values[i] = new(sql.NullString)
@@ -391,6 +393,12 @@ func (_m *User) assignValues(columns []string, values []any) error {
 			} else if value.Valid {
 				_m.TotalRecharged = value.Float64
 			}
+		case user.FieldRpmLimit:
+			if value, ok := values[i].(*sql.NullInt64); !ok {
+				return fmt.Errorf("unexpected type %T for field rpm_limit", values[i])
+			} else if value.Valid {
+				_m.RpmLimit = int(value.Int64)
+			}
 		default:
 			_m.selectValues.Set(columns[i], values[i])
 		}
@@ -569,6 +577,9 @@ func (_m *User) String() string {
 	builder.WriteString(", ")
 	builder.WriteString("total_recharged=")
 	builder.WriteString(fmt.Sprintf("%v", _m.TotalRecharged))
+	builder.WriteString(", ")
+	builder.WriteString("rpm_limit=")
+	builder.WriteString(fmt.Sprintf("%v", _m.RpmLimit))
 	builder.WriteByte(')')
 	return builder.String()
 }

backend/ent/user/user.go

@@ -59,6 +59,8 @@ const (
 	FieldBalanceNotifyExtraEmails = "balance_notify_extra_emails"
 	// FieldTotalRecharged holds the string denoting the total_recharged field in the database.
 	FieldTotalRecharged = "total_recharged"
+	// FieldRpmLimit holds the string denoting the rpm_limit field in the database.
+	FieldRpmLimit = "rpm_limit"
 	// EdgeAPIKeys holds the string denoting the api_keys edge name in mutations.
 	EdgeAPIKeys = "api_keys"
 	// EdgeRedeemCodes holds the string denoting the redeem_codes edge name in mutations.
@@ -203,6 +205,7 @@ var Columns = []string{
 	FieldBalanceNotifyThreshold,
 	FieldBalanceNotifyExtraEmails,
 	FieldTotalRecharged,
+	FieldRpmLimit,
 }
 
 var (
@@ -271,6 +274,8 @@ var (
 	DefaultBalanceNotifyExtraEmails string
 	// DefaultTotalRecharged holds the default value on creation for the "total_recharged" field.
 	DefaultTotalRecharged float64
+	// DefaultRpmLimit holds the default value on creation for the "rpm_limit" field.
+	DefaultRpmLimit int
 )
 
 // OrderOption defines the ordering options for the User queries.
@@ -391,6 +396,11 @@ func ByTotalRecharged(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldTotalRecharged, opts...).ToFunc()
 }
 
+// ByRpmLimit orders the results by the rpm_limit field.
+func ByRpmLimit(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldRpmLimit, opts...).ToFunc()
+}
+
 // ByAPIKeysCount orders the results by api_keys count.
 func ByAPIKeysCount(opts ...sql.OrderTermOption) OrderOption {
 	return func(s *sql.Selector) {

backend/ent/user/where.go

@@ -165,6 +165,11 @@ func TotalRecharged(v float64) predicate.User {
 	return predicate.User(sql.FieldEQ(FieldTotalRecharged, v))
 }
 
+// RpmLimit applies equality check predicate on the "rpm_limit" field. It's identical to RpmLimitEQ.
+func RpmLimit(v int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldRpmLimit, v))
+}
+
 // CreatedAtEQ applies the EQ predicate on the "created_at" field.
 func CreatedAtEQ(v time.Time) predicate.User {
 	return predicate.User(sql.FieldEQ(FieldCreatedAt, v))
@@ -1295,6 +1300,46 @@ func TotalRechargedLTE(v float64) predicate.User {
 	return predicate.User(sql.FieldLTE(FieldTotalRecharged, v))
 }
 
+// RpmLimitEQ applies the EQ predicate on the "rpm_limit" field.
+func RpmLimitEQ(v int) predicate.User {
+	return predicate.User(sql.FieldEQ(FieldRpmLimit, v))
+}
+
+// RpmLimitNEQ applies the NEQ predicate on the "rpm_limit" field.
+func RpmLimitNEQ(v int) predicate.User {
+	return predicate.User(sql.FieldNEQ(FieldRpmLimit, v))
+}
+
+// RpmLimitIn applies the In predicate on the "rpm_limit" field.
+func RpmLimitIn(vs ...int) predicate.User {
+	return predicate.User(sql.FieldIn(FieldRpmLimit, vs...))
+}
+
+// RpmLimitNotIn applies the NotIn predicate on the "rpm_limit" field.
+func RpmLimitNotIn(vs ...int) predicate.User {
+	return predicate.User(sql.FieldNotIn(FieldRpmLimit, vs...))
+}
+
+// RpmLimitGT applies the GT predicate on the "rpm_limit" field.
+func RpmLimitGT(v int) predicate.User {
+	return predicate.User(sql.FieldGT(FieldRpmLimit, v))
+}
+
+// RpmLimitGTE applies the GTE predicate on the "rpm_limit" field.
+func RpmLimitGTE(v int) predicate.User {
+	return predicate.User(sql.FieldGTE(FieldRpmLimit, v))
+}
+
+// RpmLimitLT applies the LT predicate on the "rpm_limit" field.
+func RpmLimitLT(v int) predicate.User {
+	return predicate.User(sql.FieldLT(FieldRpmLimit, v))
+}
+
+// RpmLimitLTE applies the LTE predicate on the "rpm_limit" field.
+func RpmLimitLTE(v int) predicate.User {
+	return predicate.User(sql.FieldLTE(FieldRpmLimit, v))
+}
+
 // HasAPIKeys applies the HasEdge predicate on the "api_keys" edge.
 func HasAPIKeys() predicate.User {
 	return predicate.User(func(s *sql.Selector) {

backend/ent/user_create.go

@@ -325,6 +325,20 @@ func (_c *UserCreate) SetNillableTotalRecharged(v *float64) *UserCreate {
 	return _c
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_c *UserCreate) SetRpmLimit(v int) *UserCreate {
+	_c.mutation.SetRpmLimit(v)
+	return _c
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_c *UserCreate) SetNillableRpmLimit(v *int) *UserCreate {
+	if v != nil {
+		_c.SetRpmLimit(*v)
+	}
+	return _c
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_c *UserCreate) AddAPIKeyIDs(ids ...int64) *UserCreate {
 	_c.mutation.AddAPIKeyIDs(ids...)
@@ -604,6 +618,10 @@ func (_c *UserCreate) defaults() error {
 		v := user.DefaultTotalRecharged
 		_c.mutation.SetTotalRecharged(v)
 	}
+	if _, ok := _c.mutation.RpmLimit(); !ok {
+		v := user.DefaultRpmLimit
+		_c.mutation.SetRpmLimit(v)
+	}
 	return nil
 }
 
@@ -687,6 +705,9 @@ func (_c *UserCreate) check() error {
 	if _, ok := _c.mutation.TotalRecharged(); !ok {
 		return &ValidationError{Name: "total_recharged", err: errors.New(`ent: missing required field "User.total_recharged"`)}
 	}
+	if _, ok := _c.mutation.RpmLimit(); !ok {
+		return &ValidationError{Name: "rpm_limit", err: errors.New(`ent: missing required field "User.rpm_limit"`)}
+	}
 	return nil
 }
 
@@ -802,6 +823,10 @@ func (_c *UserCreate) createSpec() (*User, *sqlgraph.CreateSpec) {
 		_spec.SetField(user.FieldTotalRecharged, field.TypeFloat64, value)
 		_node.TotalRecharged = value
 	}
+	if value, ok := _c.mutation.RpmLimit(); ok {
+		_spec.SetField(user.FieldRpmLimit, field.TypeInt, value)
+		_node.RpmLimit = value
+	}
 	if nodes := _c.mutation.APIKeysIDs(); len(nodes) > 0 {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1362,6 +1387,24 @@ func (u *UserUpsert) AddTotalRecharged(v float64) *UserUpsert {
 	return u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *UserUpsert) SetRpmLimit(v int) *UserUpsert {
+	u.Set(user.FieldRpmLimit, v)
+	return u
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *UserUpsert) UpdateRpmLimit() *UserUpsert {
+	u.SetExcluded(user.FieldRpmLimit)
+	return u
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *UserUpsert) AddRpmLimit(v int) *UserUpsert {
+	u.Add(user.FieldRpmLimit, v)
+	return u
+}
+
 // UpdateNewValues updates the mutable fields using the new values that were set on create.
 // Using this option is equivalent to using:
 //
@@ -1771,6 +1814,27 @@ func (u *UserUpsertOne) UpdateTotalRecharged() *UserUpsertOne {
 	})
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *UserUpsertOne) SetRpmLimit(v int) *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.SetRpmLimit(v)
+	})
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *UserUpsertOne) AddRpmLimit(v int) *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.AddRpmLimit(v)
+	})
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *UserUpsertOne) UpdateRpmLimit() *UserUpsertOne {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateRpmLimit()
+	})
+}
+
 // Exec executes the query.
 func (u *UserUpsertOne) Exec(ctx context.Context) error {
 	if len(u.create.conflict) == 0 {
@@ -2346,6 +2410,27 @@ func (u *UserUpsertBulk) UpdateTotalRecharged() *UserUpsertBulk {
 	})
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (u *UserUpsertBulk) SetRpmLimit(v int) *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.SetRpmLimit(v)
+	})
+}
+
+// AddRpmLimit adds v to the "rpm_limit" field.
+func (u *UserUpsertBulk) AddRpmLimit(v int) *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.AddRpmLimit(v)
+	})
+}
+
+// UpdateRpmLimit sets the "rpm_limit" field to the value that was provided on create.
+func (u *UserUpsertBulk) UpdateRpmLimit() *UserUpsertBulk {
+	return u.Update(func(s *UserUpsert) {
+		s.UpdateRpmLimit()
+	})
+}
+
 // Exec executes the query.
 func (u *UserUpsertBulk) Exec(ctx context.Context) error {
 	if u.create.err != nil {

backend/ent/user_update.go

@@ -389,6 +389,27 @@ func (_u *UserUpdate) AddTotalRecharged(v float64) *UserUpdate {
 	return _u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_u *UserUpdate) SetRpmLimit(v int) *UserUpdate {
+	_u.mutation.ResetRpmLimit()
+	_u.mutation.SetRpmLimit(v)
+	return _u
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_u *UserUpdate) SetNillableRpmLimit(v *int) *UserUpdate {
+	if v != nil {
+		_u.SetRpmLimit(*v)
+	}
+	return _u
+}
+
+// AddRpmLimit adds value to the "rpm_limit" field.
+func (_u *UserUpdate) AddRpmLimit(v int) *UserUpdate {
+	_u.mutation.AddRpmLimit(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdate) AddAPIKeyIDs(ids ...int64) *UserUpdate {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -1008,6 +1029,12 @@ func (_u *UserUpdate) sqlSave(ctx context.Context) (_node int, err error) {
 	if value, ok := _u.mutation.AddedTotalRecharged(); ok {
 		_spec.AddField(user.FieldTotalRecharged, field.TypeFloat64, value)
 	}
+	if value, ok := _u.mutation.RpmLimit(); ok {
+		_spec.SetField(user.FieldRpmLimit, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedRpmLimit(); ok {
+		_spec.AddField(user.FieldRpmLimit, field.TypeInt, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,
@@ -1930,6 +1957,27 @@ func (_u *UserUpdateOne) AddTotalRecharged(v float64) *UserUpdateOne {
 	return _u
 }
 
+// SetRpmLimit sets the "rpm_limit" field.
+func (_u *UserUpdateOne) SetRpmLimit(v int) *UserUpdateOne {
+	_u.mutation.ResetRpmLimit()
+	_u.mutation.SetRpmLimit(v)
+	return _u
+}
+
+// SetNillableRpmLimit sets the "rpm_limit" field if the given value is not nil.
+func (_u *UserUpdateOne) SetNillableRpmLimit(v *int) *UserUpdateOne {
+	if v != nil {
+		_u.SetRpmLimit(*v)
+	}
+	return _u
+}
+
+// AddRpmLimit adds value to the "rpm_limit" field.
+func (_u *UserUpdateOne) AddRpmLimit(v int) *UserUpdateOne {
+	_u.mutation.AddRpmLimit(v)
+	return _u
+}
+
 // AddAPIKeyIDs adds the "api_keys" edge to the APIKey entity by IDs.
 func (_u *UserUpdateOne) AddAPIKeyIDs(ids ...int64) *UserUpdateOne {
 	_u.mutation.AddAPIKeyIDs(ids...)
@@ -2579,6 +2627,12 @@ func (_u *UserUpdateOne) sqlSave(ctx context.Context) (_node *User, err error) {
 	if value, ok := _u.mutation.AddedTotalRecharged(); ok {
 		_spec.AddField(user.FieldTotalRecharged, field.TypeFloat64, value)
 	}
+	if value, ok := _u.mutation.RpmLimit(); ok {
+		_spec.SetField(user.FieldRpmLimit, field.TypeInt, value)
+	}
+	if value, ok := _u.mutation.AddedRpmLimit(); ok {
+		_spec.AddField(user.FieldRpmLimit, field.TypeInt, value)
+	}
 	if _u.mutation.APIKeysCleared() {
 		edge := &sqlgraph.EdgeSpec{
 			Rel:     sqlgraph.O2M,

backend/go.mod

@@ -104,6 +104,7 @@ 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

backend/go.sum

@@ -162,6 +162,8 @@ 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=
@@ -216,6 +218,8 @@ github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovk
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
 github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/mdelapenya/tlscert v0.2.0 h1:7H81W6Z/4weDvZBNOfQte5GpIMo0lGYEeWbkGp5LJHI=
@@ -249,6 +253,8 @@ github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
 github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
+github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/opencontainers/image-spec v1.1.1 h1:y0fUlFfIZhPF1W537XOLg0/fcx6zcHCJwooC2xJA040=
@@ -278,6 +284,8 @@ github.com/refraction-networking/utls v1.8.2 h1:j4Q1gJj0xngdeH+Ox/qND11aEfhpgoEv
 github.com/refraction-networking/utls v1.8.2/go.mod h1:jkSOEkLqn+S/jtpEHPOsVv/4V4EVnelwbMQl4vCWXAM=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
@@ -310,6 +318,8 @@ github.com/spf13/afero v1.11.0 h1:WJQKhtpdm3v2IzqG8VMqrr6Rf3UYpEF239Jy9wNepM8=
 github.com/spf13/afero v1.11.0/go.mod h1:GH9Y3pIexgf1MTIWtNGyogA5MwRIDXGUr+hbWNoBjkY=
 github.com/spf13/cast v1.6.0 h1:GEiTHELF+vaR5dhz3VqZfFSzZjYbgeKDpBxQVS4GYJ0=
 github.com/spf13/cast v1.6.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
+github.com/spf13/cobra v1.7.0 h1:hyqWnYt1ZQShIddO5kBpj3vu05/++x6tJ6dg8EC572I=
+github.com/spf13/cobra v1.7.0/go.mod h1:uLxZILRyS/50WlhOIKD7W6V5bgeIt+4sICxh6uRMrb0=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.18.2 h1:LUXCnvUvSM6FXAsj6nnfc8Q2tp1dIgUfY9Kc8GsSOiQ=

backend/internal/handler/admin/admin_service_stub_test.go

@@ -183,6 +183,17 @@ func (s *stubAdminService) GetUserUsageStats(ctx context.Context, userID int64,
 	return map[string]any{"user_id": userID}, nil
 }
 
+func (s *stubAdminService) GetUserRPMStatus(ctx context.Context, userID int64) (*service.UserRPMStatus, error) {
+	user, err := s.GetUser(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	return &service.UserRPMStatus{
+		UserRPMUsed:  0,
+		UserRPMLimit: user.RPMLimit,
+	}, nil
+}
+
 func (s *stubAdminService) BindUserAuthIdentity(ctx context.Context, userID int64, input service.AdminBindAuthIdentityInput) (*service.AdminBoundAuthIdentity, error) {
 	s.boundAuthIdentityFor = userID
 	copied := input
@@ -276,6 +287,14 @@ func (s *stubAdminService) BatchSetGroupRateMultipliers(_ context.Context, _ int
 	return nil
 }
 
+func (s *stubAdminService) ClearGroupRPMOverrides(_ context.Context, _ int64) error {
+	return nil
+}
+
+func (s *stubAdminService) BatchSetGroupRPMOverrides(_ context.Context, _ int64, _ []service.GroupRPMOverrideInput) error {
+	return nil
+}
+
 func (s *stubAdminService) ListAccounts(ctx context.Context, page, pageSize int, platform, accountType, status, search string, groupID int64, privacyMode string, sortBy, sortOrder string) ([]service.Account, int64, error) {
 	s.lastListAccounts.platform = platform
 	s.lastListAccounts.accountType = accountType

backend/internal/handler/admin/group_handler.go

@@ -110,6 +110,8 @@ type CreateGroupRequest struct {
 	RequirePrivacySet           bool                                      `json:"require_privacy_set"`
 	DefaultMappedModel          string                                    `json:"default_mapped_model"`
 	MessagesDispatchModelConfig service.OpenAIMessagesDispatchModelConfig `json:"messages_dispatch_model_config"`
+	// 分组 RPM 上限（0 = 不限制）
+	RPMLimit int `json:"rpm_limit"`
 	// 从指定分组复制账号（创建后自动绑定）
 	CopyAccountsFromGroupIDs []int64 `json:"copy_accounts_from_group_ids"`
 }
@@ -145,6 +147,8 @@ type UpdateGroupRequest struct {
 	RequirePrivacySet           *bool                                      `json:"require_privacy_set"`
 	DefaultMappedModel          *string                                    `json:"default_mapped_model"`
 	MessagesDispatchModelConfig *service.OpenAIMessagesDispatchModelConfig `json:"messages_dispatch_model_config"`
+	// 分组 RPM 上限（0 = 不限制）；nil 表示未提供不改动
+	RPMLimit *int `json:"rpm_limit"`
 	// 从指定分组复制账号（同步操作：先清空当前分组的账号绑定，再绑定源分组的账号）
 	CopyAccountsFromGroupIDs []int64 `json:"copy_accounts_from_group_ids"`
 }
@@ -262,6 +266,7 @@ func (h *GroupHandler) Create(c *gin.Context) {
 		RequirePrivacySet:               req.RequirePrivacySet,
 		DefaultMappedModel:              req.DefaultMappedModel,
 		MessagesDispatchModelConfig:     req.MessagesDispatchModelConfig,
+		RPMLimit:                        req.RPMLimit,
 		CopyAccountsFromGroupIDs:        req.CopyAccountsFromGroupIDs,
 	})
 	if err != nil {
@@ -313,6 +318,7 @@ func (h *GroupHandler) Update(c *gin.Context) {
 		RequirePrivacySet:               req.RequirePrivacySet,
 		DefaultMappedModel:              req.DefaultMappedModel,
 		MessagesDispatchModelConfig:     req.MessagesDispatchModelConfig,
+		RPMLimit:                        req.RPMLimit,
 		CopyAccountsFromGroupIDs:        req.CopyAccountsFromGroupIDs,
 	})
 	if err != nil {
@@ -477,6 +483,51 @@ func (h *GroupHandler) BatchSetGroupRateMultipliers(c *gin.Context) {
 	response.Success(c, gin.H{"message": "Rate multipliers updated successfully"})
 }
 
+// BatchSetGroupRPMOverridesRequest represents batch set rpm_override request
+type BatchSetGroupRPMOverridesRequest struct {
+	Entries []service.GroupRPMOverrideInput `json:"entries" binding:"required"`
+}
+
+// BatchSetGroupRPMOverrides handles batch setting rpm_override for users in a group
+// PUT /api/v1/admin/groups/:id/rpm-overrides
+func (h *GroupHandler) BatchSetGroupRPMOverrides(c *gin.Context) {
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid group ID")
+		return
+	}
+
+	var req BatchSetGroupRPMOverridesRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	if err := h.adminService.BatchSetGroupRPMOverrides(c.Request.Context(), groupID, req.Entries); err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"message": "RPM overrides updated successfully"})
+}
+
+// ClearGroupRPMOverrides handles clearing all rpm_override for a group
+// DELETE /api/v1/admin/groups/:id/rpm-overrides
+func (h *GroupHandler) ClearGroupRPMOverrides(c *gin.Context) {
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid group ID")
+		return
+	}
+
+	if err := h.adminService.ClearGroupRPMOverrides(c.Request.Context(), groupID); err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"message": "RPM overrides cleared successfully"})
+}
+
 // UpdateSortOrderRequest represents the request to update group sort orders
 type UpdateSortOrderRequest struct {
 	Updates []struct {

backend/internal/handler/admin/setting_handler.go

@@ -185,6 +185,7 @@ func (h *SettingHandler) GetSettings(c *gin.Context) {
 		CustomEndpoints:                        dto.ParseCustomEndpoints(settings.CustomEndpoints),
 		DefaultConcurrency:                     settings.DefaultConcurrency,
 		DefaultBalance:                         settings.DefaultBalance,
+		DefaultUserRPMLimit:                    settings.DefaultUserRPMLimit,
 		DefaultSubscriptions:                   defaultSubscriptions,
 		EnableModelFallback:                    settings.EnableModelFallback,
 		FallbackModelAnthropic:                 settings.FallbackModelAnthropic,
@@ -332,6 +333,7 @@ type UpdateSettingsRequest struct {
 	// 默认配置
 	DefaultConcurrency                       int                               `json:"default_concurrency"`
 	DefaultBalance                           float64                           `json:"default_balance"`
+	DefaultUserRPMLimit                      int                               `json:"default_user_rpm_limit"`
 	DefaultSubscriptions                     []dto.DefaultSubscriptionSetting  `json:"default_subscriptions"`
 	AuthSourceDefaultEmailBalance            *float64                          `json:"auth_source_default_email_balance"`
 	AuthSourceDefaultEmailConcurrency        *int                              `json:"auth_source_default_email_concurrency"`
@@ -1105,6 +1107,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		CustomEndpoints:                  customEndpointsJSON,
 		DefaultConcurrency:               req.DefaultConcurrency,
 		DefaultBalance:                   req.DefaultBalance,
+		DefaultUserRPMLimit:              req.DefaultUserRPMLimit,
 		DefaultSubscriptions:             defaultSubscriptions,
 		EnableModelFallback:              req.EnableModelFallback,
 		FallbackModelAnthropic:           req.FallbackModelAnthropic,
@@ -1400,6 +1403,7 @@ func (h *SettingHandler) UpdateSettings(c *gin.Context) {
 		CustomEndpoints:                        dto.ParseCustomEndpoints(updatedSettings.CustomEndpoints),
 		DefaultConcurrency:                     updatedSettings.DefaultConcurrency,
 		DefaultBalance:                         updatedSettings.DefaultBalance,
+		DefaultUserRPMLimit:                    updatedSettings.DefaultUserRPMLimit,
 		DefaultSubscriptions:                   updatedDefaultSubscriptions,
 		EnableModelFallback:                    updatedSettings.EnableModelFallback,
 		FallbackModelAnthropic:                 updatedSettings.FallbackModelAnthropic,

backend/internal/handler/admin/user_handler.go

@@ -40,6 +40,7 @@ type CreateUserRequest struct {
 	Notes         string  `json:"notes"`
 	Balance       float64 `json:"balance"`
 	Concurrency   int     `json:"concurrency"`
+	RPMLimit      int     `json:"rpm_limit"`
 	AllowedGroups []int64 `json:"allowed_groups"`
 }
 
@@ -52,6 +53,7 @@ type UpdateUserRequest struct {
 	Notes         *string  `json:"notes"`
 	Balance       *float64 `json:"balance"`
 	Concurrency   *int     `json:"concurrency"`
+	RPMLimit      *int     `json:"rpm_limit"`
 	Status        string   `json:"status" binding:"omitempty,oneof=active disabled"`
 	AllowedGroups *[]int64 `json:"allowed_groups"`
 	// GroupRates 用户专属分组倍率配置
@@ -243,6 +245,7 @@ func (h *UserHandler) Create(c *gin.Context) {
 		Notes:         req.Notes,
 		Balance:       req.Balance,
 		Concurrency:   req.Concurrency,
+		RPMLimit:      req.RPMLimit,
 		AllowedGroups: req.AllowedGroups,
 	})
 	if err != nil {
@@ -276,6 +279,7 @@ func (h *UserHandler) Update(c *gin.Context) {
 		Notes:         req.Notes,
 		Balance:       req.Balance,
 		Concurrency:   req.Concurrency,
+		RPMLimit:      req.RPMLimit,
 		Status:        req.Status,
 		AllowedGroups: req.AllowedGroups,
 		GroupRates:    req.GroupRates,
@@ -455,3 +459,21 @@ func (h *UserHandler) ReplaceGroup(c *gin.Context) {
 		"migrated_keys": result.MigratedKeys,
 	})
 }
+
+// GetUserRPMStatus 返回指定用户当前分钟的 RPM 用量
+// GET /api/v1/admin/users/:id/rpm-status
+func (h *UserHandler) GetUserRPMStatus(c *gin.Context) {
+	userID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid user ID")
+		return
+	}
+
+	status, err := h.adminService.GetUserRPMStatus(c.Request.Context(), userID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, status)
+}

backend/internal/handler/dto/mappers.go

@@ -29,6 +29,7 @@ func UserFromServiceShallow(u *service.User) *User {
 		BalanceNotifyThreshold:     u.BalanceNotifyThreshold,
 		BalanceNotifyExtraEmails:   NotifyEmailEntriesFromService(u.BalanceNotifyExtraEmails),
 		TotalRecharged:             u.TotalRecharged,
+		RPMLimit:                   u.RPMLimit,
 	}
 }
 
@@ -184,6 +185,7 @@ func groupFromServiceBase(g *service.Group) Group {
 		AllowMessagesDispatch:           g.AllowMessagesDispatch,
 		RequireOAuthOnly:                g.RequireOAuthOnly,
 		RequirePrivacySet:               g.RequirePrivacySet,
+		RPMLimit:                        g.RPMLimit,
 		CreatedAt:                       g.CreatedAt,
 		UpdatedAt:                       g.UpdatedAt,
 	}

backend/internal/handler/dto/settings.go

@@ -108,6 +108,7 @@ type SystemSettings struct {
 
 	DefaultConcurrency   int                          `json:"default_concurrency"`
 	DefaultBalance       float64                      `json:"default_balance"`
+	DefaultUserRPMLimit  int                          `json:"default_user_rpm_limit"`
 	DefaultSubscriptions []DefaultSubscriptionSetting `json:"default_subscriptions"`
 
 	// Model fallback configuration

backend/internal/handler/dto/types.go

@@ -26,6 +26,9 @@ type User struct {
 	BalanceNotifyExtraEmails   []NotifyEmailEntry `json:"balance_notify_extra_emails"`
 	TotalRecharged             float64            `json:"total_recharged"`
 
+	// RPMLimit 用户级每分钟请求数上限（0 = 不限制），仅在所用分组未设置 rpm_limit 时作为兜底生效。
+	RPMLimit int `json:"rpm_limit"`
+
 	APIKeys       []APIKey           `json:"api_keys,omitempty"`
 	Subscriptions []UserSubscription `json:"subscriptions,omitempty"`
 }
@@ -108,6 +111,9 @@ type Group struct {
 	RequireOAuthOnly  bool `json:"require_oauth_only"`
 	RequirePrivacySet bool `json:"require_privacy_set"`
 
+	// RPMLimit 分组级每分钟请求数上限（0 = 不限制），设置后覆盖用户级 rpm_limit。
+	RPMLimit int `json:"rpm_limit"`
+
 	CreatedAt time.Time `json:"created_at"`
 	UpdatedAt time.Time `json:"updated_at"`
 }

backend/internal/handler/gateway_handler.go

@@ -243,7 +243,10 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 	// 2. 【新增】Wait后二次检查余额/订阅
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("gateway.billing_eligibility_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.handleStreamingAwareError(c, status, code, message, streamStarted)
 		return
 	}
@@ -735,7 +738,10 @@ func (h *GatewayHandler) Messages(c *gin.Context) {
 						}
 						fallbackAPIKey := cloneAPIKeyWithGroup(apiKey, fallbackGroup)
 						if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), fallbackAPIKey.User, fallbackAPIKey, fallbackGroup, nil); err != nil {
-							status, code, message := billingErrorDetails(err)
+							status, code, message, retryAfter := billingErrorDetails(err)
+							if retryAfter > 0 {
+								c.Header("Retry-After", strconv.Itoa(retryAfter))
+							}
 							h.handleStreamingAwareError(c, status, code, message, streamStarted)
 							return
 						}
@@ -1441,7 +1447,10 @@ func (h *GatewayHandler) CountTokens(c *gin.Context) {
 	// 校验 billing eligibility（订阅/余额）
 	// 【注意】不计算并发，但需要校验订阅/余额
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.errorResponse(c, status, code, message)
 		return
 	}
@@ -1684,25 +1693,32 @@ func sendMockInterceptResponse(c *gin.Context, model string, interceptType Inter
 	c.JSON(http.StatusOK, response)
 }
 
-func billingErrorDetails(err error) (status int, code, message string) {
+func billingErrorDetails(err error) (status int, code, message string, retryAfter int) {
 	if errors.Is(err, service.ErrBillingServiceUnavailable) {
 		msg := pkgerrors.Message(err)
 		if msg == "" {
 			msg = "Billing service temporarily unavailable. Please retry later."
 		}
-		return http.StatusServiceUnavailable, "billing_service_error", msg
+		return http.StatusServiceUnavailable, "billing_service_error", msg, 0
 	}
 	if errors.Is(err, service.ErrAPIKeyRateLimit5hExceeded) {
 		msg := pkgerrors.Message(err)
-		return http.StatusTooManyRequests, "rate_limit_exceeded", msg
+		return http.StatusTooManyRequests, "rate_limit_exceeded", msg, 0
 	}
 	if errors.Is(err, service.ErrAPIKeyRateLimit1dExceeded) {
 		msg := pkgerrors.Message(err)
-		return http.StatusTooManyRequests, "rate_limit_exceeded", msg
+		return http.StatusTooManyRequests, "rate_limit_exceeded", msg, 0
 	}
 	if errors.Is(err, service.ErrAPIKeyRateLimit7dExceeded) {
 		msg := pkgerrors.Message(err)
-		return http.StatusTooManyRequests, "rate_limit_exceeded", msg
+		return http.StatusTooManyRequests, "rate_limit_exceeded", msg, 0
+	}
+	// 用户/分组 RPM 超限统一映射为 HTTP 429；保留与其它 rate_limit 一致的错误码便于客户端分类。
+	// 返回 Retry-After 秒数（当前分钟剩余秒数），让 SDK 自动退避。
+	if errors.Is(err, service.ErrGroupRPMExceeded) || errors.Is(err, service.ErrUserRPMExceeded) {
+		msg := pkgerrors.Message(err)
+		retrySeconds := 60 - int(time.Now().Unix()%60)
+		return http.StatusTooManyRequests, "rate_limit_exceeded", msg, retrySeconds
 	}
 	msg := pkgerrors.Message(err)
 	if msg == "" {
@@ -1712,7 +1728,7 @@ func billingErrorDetails(err error) (status int, code, message string) {
 		).Warn("gateway.billing_error_missing_message")
 		msg = "Billing error"
 	}
-	return http.StatusForbidden, "billing_error", msg
+	return http.StatusForbidden, "billing_error", msg, 0
 }
 
 func (h *GatewayHandler) metadataBridgeEnabled() bool {

backend/internal/handler/gateway_handler_billing_error_test.go

@@ -0,0 +1,54 @@
+package handler
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBillingErrorDetails_MapsGroupRPMExceededToTooManyRequests(t *testing.T) {
+	status, code, msg, retryAfter := billingErrorDetails(service.ErrGroupRPMExceeded)
+	require.Equal(t, http.StatusTooManyRequests, status)
+	require.Equal(t, "rate_limit_exceeded", code)
+	require.NotEmpty(t, msg)
+	require.Greater(t, retryAfter, 0, "RPM exceeded should return positive Retry-After")
+	require.LessOrEqual(t, retryAfter, 60)
+}
+
+func TestBillingErrorDetails_MapsUserRPMExceededToTooManyRequests(t *testing.T) {
+	status, code, msg, retryAfter := billingErrorDetails(service.ErrUserRPMExceeded)
+	require.Equal(t, http.StatusTooManyRequests, status)
+	require.Equal(t, "rate_limit_exceeded", code)
+	require.NotEmpty(t, msg)
+	require.Greater(t, retryAfter, 0, "RPM exceeded should return positive Retry-After")
+	require.LessOrEqual(t, retryAfter, 60)
+}
+
+func TestBillingErrorDetails_APIKeyRateLimitStillMaps(t *testing.T) {
+	// 回归保护：加 RPM 分支后不应影响已有 APIKey rate limit 的映射。
+	for _, err := range []error{
+		service.ErrAPIKeyRateLimit5hExceeded,
+		service.ErrAPIKeyRateLimit1dExceeded,
+		service.ErrAPIKeyRateLimit7dExceeded,
+	} {
+		status, code, _, _ := billingErrorDetails(err)
+		require.Equal(t, http.StatusTooManyRequests, status, "status for %v", err)
+		require.Equal(t, "rate_limit_exceeded", code)
+	}
+}
+
+func TestBillingErrorDetails_BillingServiceUnavailableMapsTo503(t *testing.T) {
+	status, code, _, retryAfter := billingErrorDetails(service.ErrBillingServiceUnavailable)
+	require.Equal(t, http.StatusServiceUnavailable, status)
+	require.Equal(t, "billing_service_error", code)
+	require.Equal(t, 0, retryAfter, "non-RPM errors should not set Retry-After")
+}
+
+func TestBillingErrorDetails_UnknownErrorFallsBackTo403(t *testing.T) {
+	status, code, msg, _ := billingErrorDetails(service.ErrInsufficientBalance)
+	require.Equal(t, http.StatusForbidden, status)
+	require.Equal(t, "billing_error", code)
+	require.NotEmpty(t, msg)
+}

backend/internal/handler/gateway_handler_chat_completions.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"strconv"
 	"time"
 
 	pkghttputil "github.com/Wei-Shaw/sub2api/internal/pkg/httputil"
@@ -136,7 +137,10 @@ func (h *GatewayHandler) ChatCompletions(c *gin.Context) {
 	// 2. Re-check billing
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("gateway.cc.billing_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.chatCompletionsErrorResponse(c, status, code, message)
 		return
 	}

backend/internal/handler/gateway_handler_responses.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"strconv"
 	"time"
 
 	pkghttputil "github.com/Wei-Shaw/sub2api/internal/pkg/httputil"
@@ -141,7 +142,10 @@ func (h *GatewayHandler) Responses(c *gin.Context) {
 	// 2. Re-check billing
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("gateway.responses.billing_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.responsesErrorResponse(c, status, code, message)
 		return
 	}

backend/internal/handler/gateway_handler_warmup_intercept_unit_test.go

@@ -173,7 +173,7 @@ func newTestGatewayHandler(t *testing.T, group *service.Group, accounts []*servi
 
 	// RunModeSimple：跳过计费检查，避免引入 repo/cache 依赖。
 	cfg := &config.Config{RunMode: config.RunModeSimple}
-	billingCacheSvc := service.NewBillingCacheService(nil, nil, nil, nil, cfg)
+	billingCacheSvc := service.NewBillingCacheService(nil, nil, nil, nil, nil, nil, cfg)
 
 	concurrencySvc := service.NewConcurrencyService(&fakeConcurrencyCache{})
 	concurrencyHelper := NewConcurrencyHelper(concurrencySvc, SSEPingFormatClaude, 0)

backend/internal/handler/gemini_v1beta_handler.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"net/http"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/Wei-Shaw/sub2api/internal/domain"
@@ -241,7 +242,10 @@ func (h *GatewayHandler) GeminiV1BetaModels(c *gin.Context) {
 	// 2) billing eligibility check (after wait)
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("gemini.billing_eligibility_check_failed", zap.Error(err))
-		status, _, message := billingErrorDetails(err)
+		status, _, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		googleError(c, status, message)
 		return
 	}

backend/internal/handler/openai_chat_completions.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"strconv"
 	"time"
 
 	pkghttputil "github.com/Wei-Shaw/sub2api/internal/pkg/httputil"
@@ -101,7 +102,10 @@ func (h *OpenAIGatewayHandler) ChatCompletions(c *gin.Context) {
 
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("openai_chat_completions.billing_eligibility_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.handleStreamingAwareError(c, status, code, message, streamStarted)
 		return
 	}

backend/internal/handler/openai_gateway_handler.go

@@ -228,7 +228,10 @@ func (h *OpenAIGatewayHandler) Responses(c *gin.Context) {
 	// 2. Re-check billing eligibility after wait
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("openai.billing_eligibility_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.handleStreamingAwareError(c, status, code, message, streamStarted)
 		return
 	}
@@ -594,7 +597,10 @@ func (h *OpenAIGatewayHandler) Messages(c *gin.Context) {
 
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("openai_messages.billing_eligibility_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.anthropicStreamingAwareError(c, status, code, message, streamStarted)
 		return
 	}

backend/internal/handler/openai_images.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"net/http"
+	"strconv"
 	"strings"
 	"time"
 
@@ -108,7 +109,10 @@ func (h *OpenAIGatewayHandler) Images(c *gin.Context) {
 
 	if err := h.billingCacheService.CheckBillingEligibility(c.Request.Context(), apiKey.User, apiKey, apiKey.Group, subscription); err != nil {
 		reqLog.Info("openai.images.billing_eligibility_check_failed", zap.Error(err))
-		status, code, message := billingErrorDetails(err)
+		status, code, message, retryAfter := billingErrorDetails(err)
+		if retryAfter > 0 {
+			c.Header("Retry-After", strconv.Itoa(retryAfter))
+		}
 		h.handleStreamingAwareError(c, status, code, message, streamStarted)
 		return
 	}

backend/internal/repository/api_key_repo.go

@@ -152,6 +152,7 @@ func (r *apiKeyRepository) GetByKeyForAuth(ctx context.Context, key string) (*se
 				user.FieldSignupSource,
 				user.FieldLastLoginAt,
 				user.FieldLastActiveAt,
+				user.FieldRpmLimit,
 			)
 		}).
 		WithGroup(func(q *dbent.GroupQuery) {
@@ -178,6 +179,7 @@ func (r *apiKeyRepository) GetByKeyForAuth(ctx context.Context, key string) (*se
 				group.FieldAllowMessagesDispatch,
 				group.FieldDefaultMappedModel,
 				group.FieldMessagesDispatchModelConfig,
+				group.FieldRpmLimit,
 			)
 		}).
 		Only(ctx)
@@ -669,6 +671,7 @@ func userEntityToService(u *dbent.User) *service.User {
 		BalanceNotifyThresholdType: u.BalanceNotifyThresholdType,
 		BalanceNotifyThreshold:     u.BalanceNotifyThreshold,
 		TotalRecharged:             u.TotalRecharged,
+		RPMLimit:                   u.RpmLimit,
 		CreatedAt:                  u.CreatedAt,
 		UpdatedAt:                  u.UpdatedAt,
 	}
@@ -713,6 +716,7 @@ func groupEntityToService(g *dbent.Group) *service.Group {
 		RequirePrivacySet:               g.RequirePrivacySet,
 		DefaultMappedModel:              g.DefaultMappedModel,
 		MessagesDispatchModelConfig:     g.MessagesDispatchModelConfig,
+		RPMLimit:                        g.RpmLimit,
 		CreatedAt:                       g.CreatedAt,
 		UpdatedAt:                       g.UpdatedAt,
 	}

backend/internal/repository/group_repo.go

@@ -63,7 +63,8 @@ func (r *groupRepository) Create(ctx context.Context, groupIn *service.Group) er
 		SetRequireOauthOnly(groupIn.RequireOAuthOnly).
 		SetRequirePrivacySet(groupIn.RequirePrivacySet).
 		SetDefaultMappedModel(groupIn.DefaultMappedModel).
-		SetMessagesDispatchModelConfig(groupIn.MessagesDispatchModelConfig)
+		SetMessagesDispatchModelConfig(groupIn.MessagesDispatchModelConfig).
+		SetRpmLimit(groupIn.RPMLimit)
 
 	// 设置模型路由配置
 	if groupIn.ModelRouting != nil {
@@ -130,7 +131,8 @@ func (r *groupRepository) Update(ctx context.Context, groupIn *service.Group) er
 		SetRequireOauthOnly(groupIn.RequireOAuthOnly).
 		SetRequirePrivacySet(groupIn.RequirePrivacySet).
 		SetDefaultMappedModel(groupIn.DefaultMappedModel).
-		SetMessagesDispatchModelConfig(groupIn.MessagesDispatchModelConfig)
+		SetMessagesDispatchModelConfig(groupIn.MessagesDispatchModelConfig).
+		SetRpmLimit(groupIn.RPMLimit)
 
 	// 显式处理可空字段：nil 需要 clear，非 nil 需要 set。
 	if groupIn.DailyLimitUSD != nil {

backend/internal/repository/user_group_rate_repo.go

@@ -13,14 +13,14 @@ type userGroupRateRepository struct {
 	sql sqlExecutor
 }
 
-// NewUserGroupRateRepository 创建用户专属分组倍率仓储
+// NewUserGroupRateRepository 创建用户专属分组倍率/RPM 仓储
 func NewUserGroupRateRepository(sqlDB *sql.DB) service.UserGroupRateRepository {
 	return &userGroupRateRepository{sql: sqlDB}
 }
 
-// GetByUserID 获取用户的所有专属分组倍率
+// GetByUserID 获取用户所有专属分组 rate_multiplier（仅返回非 NULL 的条目）
 func (r *userGroupRateRepository) GetByUserID(ctx context.Context, userID int64) (map[int64]float64, error) {
-	query := `SELECT group_id, rate_multiplier FROM user_group_rate_multipliers WHERE user_id = $1`
+	query := `SELECT group_id, rate_multiplier FROM user_group_rate_multipliers WHERE user_id = $1 AND rate_multiplier IS NOT NULL`
 	rows, err := r.sql.QueryContext(ctx, query, userID)
 	if err != nil {
 		return nil, err
@@ -42,8 +42,7 @@ func (r *userGroupRateRepository) GetByUserID(ctx context.Context, userID int64)
 	return result, nil
 }
 
-// GetByUserIDs 批量获取多个用户的专属分组倍率。
-// 返回结构：map[userID]map[groupID]rate
+// GetByUserIDs 批量获取多个用户的专属分组 rate_multiplier（仅返回非 NULL 的条目）
 func (r *userGroupRateRepository) GetByUserIDs(ctx context.Context, userIDs []int64) (map[int64]map[int64]float64, error) {
 	result := make(map[int64]map[int64]float64, len(userIDs))
 	if len(userIDs) == 0 {
@@ -70,7 +69,7 @@ func (r *userGroupRateRepository) GetByUserIDs(ctx context.Context, userIDs []in
 	rows, err := r.sql.QueryContext(ctx, `
 		SELECT user_id, group_id, rate_multiplier
 		FROM user_group_rate_multipliers
-		WHERE user_id = ANY($1)
+		WHERE user_id = ANY($1) AND rate_multiplier IS NOT NULL
 	`, pq.Array(uniqueIDs))
 	if err != nil {
 		return nil, err
@@ -95,10 +94,10 @@ func (r *userGroupRateRepository) GetByUserIDs(ctx context.Context, userIDs []in
 	return result, nil
 }
 
-// GetByGroupID 获取指定分组下所有用户的专属倍率
+// GetByGroupID 获取指定分组下所有用户的专属配置（rate 与 rpm_override 任一非 NULL 即返回）
 func (r *userGroupRateRepository) GetByGroupID(ctx context.Context, groupID int64) ([]service.UserGroupRateEntry, error) {
 	query := `
-		SELECT ugr.user_id, u.username, u.email, COALESCE(u.notes, ''), u.status, ugr.rate_multiplier
+		SELECT ugr.user_id, u.username, u.email, COALESCE(u.notes, ''), u.status, ugr.rate_multiplier, ugr.rpm_override
 		FROM user_group_rate_multipliers ugr
 		JOIN users u ON u.id = ugr.user_id AND u.deleted_at IS NULL
 		WHERE ugr.group_id = $1
@@ -113,9 +112,19 @@ func (r *userGroupRateRepository) GetByGroupID(ctx context.Context, groupID int6
 	var result []service.UserGroupRateEntry
 	for rows.Next() {
 		var entry service.UserGroupRateEntry
-		if err := rows.Scan(&entry.UserID, &entry.UserName, &entry.UserEmail, &entry.UserNotes, &entry.UserStatus, &entry.RateMultiplier); err != nil {
+		var rate sql.NullFloat64
+		var rpm sql.NullInt32
+		if err := rows.Scan(&entry.UserID, &entry.UserName, &entry.UserEmail, &entry.UserNotes, &entry.UserStatus, &rate, &rpm); err != nil {
 			return nil, err
 		}
+		if rate.Valid {
+			v := rate.Float64
+			entry.RateMultiplier = &v
+		}
+		if rpm.Valid {
+			v := int(rpm.Int32)
+			entry.RPMOverride = &v
+		}
 		result = append(result, entry)
 	}
 	if err := rows.Err(); err != nil {
@@ -124,10 +133,10 @@ func (r *userGroupRateRepository) GetByGroupID(ctx context.Context, groupID int6
 	return result, nil
 }
 
-// GetByUserAndGroup 获取用户在特定分组的专属倍率
+// GetByUserAndGroup 获取用户在特定分组的专属 rate_multiplier（NULL 返回 nil）
 func (r *userGroupRateRepository) GetByUserAndGroup(ctx context.Context, userID, groupID int64) (*float64, error) {
 	query := `SELECT rate_multiplier FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = $2`
-	var rate float64
+	var rate sql.NullFloat64
 	err := scanSingleRow(ctx, r.sql, query, []any{userID, groupID}, &rate)
 	if err == sql.ErrNoRows {
 		return nil, nil
@@ -135,42 +144,79 @@ func (r *userGroupRateRepository) GetByUserAndGroup(ctx context.Context, userID,
 	if err != nil {
 		return nil, err
 	}
-	return &rate, nil
+	if !rate.Valid {
+		return nil, nil
+	}
+	v := rate.Float64
+	return &v, nil
 }
 
-// SyncUserGroupRates 同步用户的分组专属倍率
+// GetRPMOverrideByUserAndGroup 获取用户在特定分组的 rpm_override（NULL 返回 nil）
+func (r *userGroupRateRepository) GetRPMOverrideByUserAndGroup(ctx context.Context, userID, groupID int64) (*int, error) {
+	query := `SELECT rpm_override FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = $2`
+	var rpm sql.NullInt32
+	err := scanSingleRow(ctx, r.sql, query, []any{userID, groupID}, &rpm)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	if !rpm.Valid {
+		return nil, nil
+	}
+	v := int(rpm.Int32)
+	return &v, nil
+}
+
+// SyncUserGroupRates 同步用户的分组专属 rate_multiplier。
+//   - 传入空 map：清空该用户所有行的 rate_multiplier；若 rpm_override 也为 NULL 则整行删除。
+//   - 值为 nil：清空对应行的 rate_multiplier（保留 rpm_override）。
+//   - 值非 nil：upsert rate_multiplier（保留已有 rpm_override）。
 func (r *userGroupRateRepository) SyncUserGroupRates(ctx context.Context, userID int64, rates map[int64]*float64) error {
 	if len(rates) == 0 {
-		// 如果传入空 map，删除该用户的所有专属倍率
-		_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE user_id = $1`, userID)
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rate_multiplier = NULL, updated_at = NOW()
+			WHERE user_id = $1
+		`, userID); err != nil {
+			return err
+		}
+		_, err := r.sql.ExecContext(ctx,
+			`DELETE FROM user_group_rate_multipliers WHERE user_id = $1 AND rate_multiplier IS NULL AND rpm_override IS NULL`,
+			userID)
 		return err
 	}
 
-	// 分离需要删除和需要 upsert 的记录
-	var toDelete []int64
+	var clearGroupIDs []int64
 	upsertGroupIDs := make([]int64, 0, len(rates))
 	upsertRates := make([]float64, 0, len(rates))
 	for groupID, rate := range rates {
 		if rate == nil {
-			toDelete = append(toDelete, groupID)
+			clearGroupIDs = append(clearGroupIDs, groupID)
 		} else {
 			upsertGroupIDs = append(upsertGroupIDs, groupID)
 			upsertRates = append(upsertRates, *rate)
 		}
 	}
 
-	// 删除指定的记录
-	if len(toDelete) > 0 {
+	if len(clearGroupIDs) > 0 {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rate_multiplier = NULL, updated_at = NOW()
+			WHERE user_id = $1 AND group_id = ANY($2)
+		`, userID, pq.Array(clearGroupIDs)); err != nil {
+			return err
+		}
 		if _, err := r.sql.ExecContext(ctx,
-			`DELETE FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = ANY($2)`,
-			userID, pq.Array(toDelete)); err != nil {
+			`DELETE FROM user_group_rate_multipliers WHERE user_id = $1 AND group_id = ANY($2) AND rate_multiplier IS NULL AND rpm_override IS NULL`,
+			userID, pq.Array(clearGroupIDs)); err != nil {
 			return err
 		}
 	}
 
-	// Upsert 记录
-	now := time.Now()
 	if len(upsertGroupIDs) > 0 {
+		now := time.Now()
 		_, err := r.sql.ExecContext(ctx, `
 			INSERT INTO user_group_rate_multipliers (user_id, group_id, rate_multiplier, created_at, updated_at)
 			SELECT
@@ -193,14 +239,47 @@ func (r *userGroupRateRepository) SyncUserGroupRates(ctx context.Context, userID
 	return nil
 }
 
-// SyncGroupRateMultipliers 批量同步分组的用户专属倍率（先删后插）
+// SyncGroupRateMultipliers 同步分组的 rate_multiplier 部分（不触动 rpm_override）。
+// 语义：
+//   - 未出现在 entries 中的用户行：rate_multiplier 归 NULL；若 rpm_override 也为 NULL 则整行删除。
+//   - 出现的用户行：upsert rate_multiplier。
 func (r *userGroupRateRepository) SyncGroupRateMultipliers(ctx context.Context, groupID int64, entries []service.GroupRateMultiplierInput) error {
-	if _, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE group_id = $1`, groupID); err != nil {
+	keepUserIDs := make([]int64, 0, len(entries))
+	for _, e := range entries {
+		keepUserIDs = append(keepUserIDs, e.UserID)
+	}
+
+	// 未在 entries 列表中的行：清空 rate_multiplier。
+	if len(keepUserIDs) == 0 {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rate_multiplier = NULL, updated_at = NOW()
+			WHERE group_id = $1
+		`, groupID); err != nil {
+			return err
+		}
+	} else {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rate_multiplier = NULL, updated_at = NOW()
+			WHERE group_id = $1 AND user_id <> ALL($2)
+		`, groupID, pq.Array(keepUserIDs)); err != nil {
+			return err
+		}
+	}
+
+	// 清空后若整行 NULL 则删除。
+	if _, err := r.sql.ExecContext(ctx, `
+		DELETE FROM user_group_rate_multipliers
+		WHERE group_id = $1 AND rate_multiplier IS NULL AND rpm_override IS NULL
+	`, groupID); err != nil {
 		return err
 	}
+
 	if len(entries) == 0 {
 		return nil
 	}
+
 	userIDs := make([]int64, len(entries))
 	rates := make([]float64, len(entries))
 	for i, e := range entries {
@@ -218,13 +297,103 @@ func (r *userGroupRateRepository) SyncGroupRateMultipliers(ctx context.Context,
 	return err
 }
 
-// DeleteByGroupID 删除指定分组的所有用户专属倍率
+// SyncGroupRPMOverrides 同步分组的 rpm_override 部分（不触动 rate_multiplier）。
+// 语义：
+//   - 未出现的用户行：rpm_override 归 NULL；若 rate_multiplier 也为 NULL 则整行删除。
+//   - 出现的用户行：若 RPMOverride 为 nil 则清空；非 nil 则 upsert。
+func (r *userGroupRateRepository) SyncGroupRPMOverrides(ctx context.Context, groupID int64, entries []service.GroupRPMOverrideInput) error {
+	keepUserIDs := make([]int64, 0, len(entries))
+	var clearUserIDs []int64
+	upsertUserIDs := make([]int64, 0, len(entries))
+	upsertValues := make([]int32, 0, len(entries))
+	for _, e := range entries {
+		keepUserIDs = append(keepUserIDs, e.UserID)
+		if e.RPMOverride == nil {
+			clearUserIDs = append(clearUserIDs, e.UserID)
+		} else {
+			upsertUserIDs = append(upsertUserIDs, e.UserID)
+			upsertValues = append(upsertValues, int32(*e.RPMOverride))
+		}
+	}
+
+	// 未在 entries 列表中的行：清空 rpm_override。
+	if len(keepUserIDs) == 0 {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rpm_override = NULL, updated_at = NOW()
+			WHERE group_id = $1
+		`, groupID); err != nil {
+			return err
+		}
+	} else {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rpm_override = NULL, updated_at = NOW()
+			WHERE group_id = $1 AND user_id <> ALL($2)
+		`, groupID, pq.Array(keepUserIDs)); err != nil {
+			return err
+		}
+	}
+
+	// 显式 clear 的行。
+	if len(clearUserIDs) > 0 {
+		if _, err := r.sql.ExecContext(ctx, `
+			UPDATE user_group_rate_multipliers
+			SET rpm_override = NULL, updated_at = NOW()
+			WHERE group_id = $1 AND user_id = ANY($2)
+		`, groupID, pq.Array(clearUserIDs)); err != nil {
+			return err
+		}
+	}
+
+	// 清空后若整行 NULL 则删除。
+	if _, err := r.sql.ExecContext(ctx, `
+		DELETE FROM user_group_rate_multipliers
+		WHERE group_id = $1 AND rate_multiplier IS NULL AND rpm_override IS NULL
+	`, groupID); err != nil {
+		return err
+	}
+
+	if len(upsertUserIDs) > 0 {
+		now := time.Now()
+		_, err := r.sql.ExecContext(ctx, `
+			INSERT INTO user_group_rate_multipliers (user_id, group_id, rpm_override, created_at, updated_at)
+			SELECT data.user_id, $1::bigint, data.rpm_override, $2::timestamptz, $2::timestamptz
+			FROM unnest($3::bigint[], $4::integer[]) AS data(user_id, rpm_override)
+			ON CONFLICT (user_id, group_id)
+			DO UPDATE SET rpm_override = EXCLUDED.rpm_override, updated_at = EXCLUDED.updated_at
+		`, groupID, now, pq.Array(upsertUserIDs), pq.Array(upsertValues))
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// ClearGroupRPMOverrides 清空指定分组所有行的 rpm_override。
+func (r *userGroupRateRepository) ClearGroupRPMOverrides(ctx context.Context, groupID int64) error {
+	if _, err := r.sql.ExecContext(ctx, `
+		UPDATE user_group_rate_multipliers
+		SET rpm_override = NULL, updated_at = NOW()
+		WHERE group_id = $1
+	`, groupID); err != nil {
+		return err
+	}
+	_, err := r.sql.ExecContext(ctx, `
+		DELETE FROM user_group_rate_multipliers
+		WHERE group_id = $1 AND rate_multiplier IS NULL AND rpm_override IS NULL
+	`, groupID)
+	return err
+}
+
+// DeleteByGroupID 删除指定分组的所有用户专属条目
 func (r *userGroupRateRepository) DeleteByGroupID(ctx context.Context, groupID int64) error {
 	_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE group_id = $1`, groupID)
 	return err
 }
 
-// DeleteByUserID 删除指定用户的所有专属倍率
+// DeleteByUserID 删除指定用户的所有专属条目
 func (r *userGroupRateRepository) DeleteByUserID(ctx context.Context, userID int64) error {
 	_, err := r.sql.ExecContext(ctx, `DELETE FROM user_group_rate_multipliers WHERE user_id = $1`, userID)
 	return err

backend/internal/repository/user_repo.go

@@ -93,6 +93,7 @@ func (r *userRepository) Create(ctx context.Context, userIn *service.User) error
 		SetSignupSource(userSignupSourceOrDefault(userIn.SignupSource)).
 		SetNillableLastLoginAt(userIn.LastLoginAt).
 		SetNillableLastActiveAt(userIn.LastActiveAt).
+		SetRpmLimit(userIn.RPMLimit).
 		Save(txCtx)
 	if err != nil {
 		return translatePersistenceError(err, nil, service.ErrEmailExists)
@@ -219,7 +220,8 @@ func (r *userRepository) Update(ctx context.Context, userIn *service.User) error
 		SetBalanceNotifyThresholdType(userIn.BalanceNotifyThresholdType).
 		SetNillableBalanceNotifyThreshold(userIn.BalanceNotifyThreshold).
 		SetBalanceNotifyExtraEmails(marshalExtraEmails(userIn.BalanceNotifyExtraEmails)).
-		SetTotalRecharged(userIn.TotalRecharged)
+		SetTotalRecharged(userIn.TotalRecharged).
+		SetRpmLimit(userIn.RPMLimit)
 	if userIn.SignupSource != "" {
 		updateOp = updateOp.SetSignupSource(userIn.SignupSource)
 	}

backend/internal/repository/user_rpm_cache.go

@@ -0,0 +1,108 @@
+package repository
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+	"github.com/redis/go-redis/v9"
+)
+
+// 用户/分组级 RPM 计数器 Redis 实现。
+//
+// 设计说明：
+//   - key 形式：rpm:ug:{uid}:{gid}:{minute}、rpm:u:{uid}:{minute}
+//   - 时间来源：rdb.Time()（Redis 服务端时间），避免多实例时钟漂移。
+//   - 原子操作：TxPipeline (MULTI/EXEC) 执行 INCR+EXPIRE，兼容 Redis Cluster。
+//   - TTL：120s，覆盖当前分钟窗口 + 少量冗余。
+//   - 返回值语义：超限判断由调用方（billing_cache_service.checkRPM）与 RPMLimit 比较完成。
+const (
+	userGroupRPMKeyPrefix = "rpm:ug:"
+	userRPMKeyPrefix      = "rpm:u:"
+
+	userRPMKeyTTL = 120 * time.Second
+)
+
+type userRPMCacheImpl struct {
+	rdb *redis.Client
+}
+
+// NewUserRPMCache 创建用户/分组级 RPM 计数器。
+func NewUserRPMCache(rdb *redis.Client) service.UserRPMCache {
+	return &userRPMCacheImpl{rdb: rdb}
+}
+
+// minuteTS 获取当前 Redis 服务端分钟时间戳。
+func (c *userRPMCacheImpl) minuteTS(ctx context.Context) (int64, error) {
+	t, err := c.rdb.Time(ctx).Result()
+	if err != nil {
+		return 0, fmt.Errorf("redis TIME: %w", err)
+	}
+	return t.Unix() / 60, nil
+}
+
+// atomicIncr 原子 INCR+EXPIRE。
+func (c *userRPMCacheImpl) atomicIncr(ctx context.Context, key string) (int, error) {
+	pipe := c.rdb.TxPipeline()
+	incr := pipe.Incr(ctx, key)
+	pipe.Expire(ctx, key, userRPMKeyTTL)
+	if _, err := pipe.Exec(ctx); err != nil {
+		return 0, fmt.Errorf("user rpm increment: %w", err)
+	}
+	return int(incr.Val()), nil
+}
+
+// IncrementUserGroupRPM 递增 (user, group) 分钟计数。
+func (c *userRPMCacheImpl) IncrementUserGroupRPM(ctx context.Context, userID, groupID int64) (int, error) {
+	minute, err := c.minuteTS(ctx)
+	if err != nil {
+		return 0, err
+	}
+	key := fmt.Sprintf("%s%d:%d:%d", userGroupRPMKeyPrefix, userID, groupID, minute)
+	return c.atomicIncr(ctx, key)
+}
+
+// IncrementUserRPM 递增用户分钟计数。
+func (c *userRPMCacheImpl) IncrementUserRPM(ctx context.Context, userID int64) (int, error) {
+	minute, err := c.minuteTS(ctx)
+	if err != nil {
+		return 0, err
+	}
+	key := fmt.Sprintf("%s%d:%d", userRPMKeyPrefix, userID, minute)
+	return c.atomicIncr(ctx, key)
+}
+
+// GetUserGroupRPM 获取 (user, group) 当前分钟已用 RPM（只读）。
+func (c *userRPMCacheImpl) GetUserGroupRPM(ctx context.Context, userID, groupID int64) (int, error) {
+	minute, err := c.minuteTS(ctx)
+	if err != nil {
+		return 0, err
+	}
+	key := fmt.Sprintf("%s%d:%d:%d", userGroupRPMKeyPrefix, userID, groupID, minute)
+	val, err := c.rdb.Get(ctx, key).Int()
+	if err == redis.Nil {
+		return 0, nil
+	}
+	if err != nil {
+		return 0, fmt.Errorf("user group rpm get: %w", err)
+	}
+	return val, nil
+}
+
+// GetUserRPM 获取用户当前分钟已用 RPM（只读）。
+func (c *userRPMCacheImpl) GetUserRPM(ctx context.Context, userID int64) (int, error) {
+	minute, err := c.minuteTS(ctx)
+	if err != nil {
+		return 0, err
+	}
+	key := fmt.Sprintf("%s%d:%d", userRPMKeyPrefix, userID, minute)
+	val, err := c.rdb.Get(ctx, key).Int()
+	if err == redis.Nil {
+		return 0, nil
+	}
+	if err != nil {
+		return 0, fmt.Errorf("user rpm get: %w", err)
+	}
+	return val, nil
+}

backend/internal/repository/wire.go

@@ -101,6 +101,7 @@ var ProviderSet = wire.NewSet(
 	ProvideConcurrencyCache,
 	ProvideSessionLimitCache,
 	NewRPMCache,
+	NewUserRPMCache,
 	NewUserMsgQueueCache,
 	NewDashboardCache,
 	NewEmailCache,

backend/internal/server/api_contract_test.go

@@ -55,6 +55,7 @@ func TestAPIContracts(t *testing.T) {
 					"role": "user",
 					"balance": 12.5,
 					"concurrency": 5,
+					"rpm_limit": 0,
 					"status": "active",
 					"allowed_groups": null,
 					"created_at": "2025-01-02T03:04:05Z",
@@ -333,6 +334,7 @@ func TestAPIContracts(t *testing.T) {
 						"fallback_group_id_on_invalid_request": null,
 						"require_oauth_only": false,
 						"require_privacy_set": false,
+						"rpm_limit": 0,
 						"created_at": "2025-01-02T03:04:05Z",
 						"updated_at": "2025-01-02T03:04:05Z"
 					}
@@ -713,6 +715,7 @@ func TestAPIContracts(t *testing.T) {
 					"force_email_on_third_party_signup": false,
 					"default_concurrency": 5,
 					"default_balance": 1.25,
+					"default_user_rpm_limit": 0,
 					"default_subscriptions": [],
 					"enable_model_fallback": false,
 					"fallback_model_anthropic": "claude-3-5-sonnet-20241022",
@@ -889,6 +892,7 @@ func TestAPIContracts(t *testing.T) {
 					"custom_endpoints": [],
 					"default_concurrency": 0,
 					"default_balance": 0,
+					"default_user_rpm_limit": 0,
 					"default_subscriptions": [],
 					"enable_model_fallback": false,
 					"fallback_model_anthropic": "claude-3-5-sonnet-20241022",
@@ -1084,7 +1088,7 @@ func newContractDeps(t *testing.T) *contractDeps {
 	settingRepo := newStubSettingRepo()
 	settingService := service.NewSettingService(settingRepo, cfg)
 
-	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil)
+	adminService := service.NewAdminService(userRepo, groupRepo, &accountRepo, proxyRepo, apiKeyRepo, redeemRepo, nil, nil, nil, nil, nil, 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)

backend/internal/server/routes/admin.go

@@ -221,6 +221,7 @@ func registerUserManagementRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 		users.GET("/:id/usage", h.Admin.User.GetUserUsage)
 		users.GET("/:id/balance-history", h.Admin.User.GetBalanceHistory)
 		users.POST("/:id/replace-group", h.Admin.User.ReplaceGroup)
+		users.GET("/:id/rpm-status", h.Admin.User.GetUserRPMStatus)
 
 		// User attribute values
 		users.GET("/:id/attributes", h.Admin.UserAttribute.GetUserAttributes)
@@ -244,6 +245,8 @@ func registerGroupRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 		groups.GET("/:id/rate-multipliers", h.Admin.Group.GetGroupRateMultipliers)
 		groups.PUT("/:id/rate-multipliers", h.Admin.Group.BatchSetGroupRateMultipliers)
 		groups.DELETE("/:id/rate-multipliers", h.Admin.Group.ClearGroupRateMultipliers)
+		groups.PUT("/:id/rpm-overrides", h.Admin.Group.BatchSetGroupRPMOverrides)
+		groups.DELETE("/:id/rpm-overrides", h.Admin.Group.ClearGroupRPMOverrides)
 		groups.GET("/:id/api-keys", h.Admin.Group.GetGroupAPIKeys)
 	}
 }

backend/internal/service/admin_service.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"log/slog"
 	"net/http"
+	"sort"
 	"strings"
 	"time"
 
@@ -32,6 +33,7 @@ type AdminService interface {
 	UpdateUserBalance(ctx context.Context, userID int64, balance float64, operation string, notes string) (*User, error)
 	GetUserAPIKeys(ctx context.Context, userID int64, page, pageSize int, sortBy, sortOrder string) ([]APIKey, int64, error)
 	GetUserUsageStats(ctx context.Context, userID int64, period string) (any, error)
+	GetUserRPMStatus(ctx context.Context, userID int64) (*UserRPMStatus, error)
 	// GetUserBalanceHistory returns paginated balance/concurrency change records for a user.
 	// codeType is optional - pass empty string to return all types.
 	// Also returns totalRecharged (sum of all positive balance top-ups).
@@ -50,6 +52,8 @@ type AdminService interface {
 	GetGroupRateMultipliers(ctx context.Context, groupID int64) ([]UserGroupRateEntry, error)
 	ClearGroupRateMultipliers(ctx context.Context, groupID int64) error
 	BatchSetGroupRateMultipliers(ctx context.Context, groupID int64, entries []GroupRateMultiplierInput) error
+	ClearGroupRPMOverrides(ctx context.Context, groupID int64) error
+	BatchSetGroupRPMOverrides(ctx context.Context, groupID int64, entries []GroupRPMOverrideInput) error
 	UpdateGroupSortOrders(ctx context.Context, updates []GroupSortOrderUpdate) error
 
 	// API Key management (admin)
@@ -114,6 +118,7 @@ type CreateUserInput struct {
 	Notes         string
 	Balance       float64
 	Concurrency   int
+	RPMLimit      int
 	AllowedGroups []int64
 }
 
@@ -124,6 +129,7 @@ type UpdateUserInput struct {
 	Notes         *string
 	Balance       *float64 // 使用指针区分"未提供"和"设置为0"
 	Concurrency   *int     // 使用指针区分"未提供"和"设置为0"
+	RPMLimit      *int     // 使用指针区分"未提供"和"设置为0"
 	Status        string
 	AllowedGroups *[]int64 // 使用指针区分"未提供"和"设置为空数组"
 	// GroupRates 用户专属分组倍率配置
@@ -199,6 +205,8 @@ type CreateGroupInput struct {
 	RequireOAuthOnly            bool
 	RequirePrivacySet           bool
 	MessagesDispatchModelConfig OpenAIMessagesDispatchModelConfig
+	// RPMLimit 分组 RPM 上限（0 = 不限制）
+	RPMLimit int
 	// 从指定分组复制账号（创建分组后在同一事务内绑定）
 	CopyAccountsFromGroupIDs []int64
 }
@@ -234,6 +242,8 @@ type UpdateGroupInput struct {
 	RequireOAuthOnly            *bool
 	RequirePrivacySet           *bool
 	MessagesDispatchModelConfig *OpenAIMessagesDispatchModelConfig
+	// RPMLimit 分组 RPM 上限（0 = 不限制），nil 表示未提供不改动。
+	RPMLimit *int
 	// 从指定分组复制账号（同步操作：先清空当前分组的账号绑定，再绑定源分组的账号）
 	CopyAccountsFromGroupIDs []int64
 }
@@ -317,6 +327,22 @@ type ReplaceUserGroupResult struct {
 	MigratedKeys int64 // 迁移的 Key 数量
 }
 
+// UserRPMStatus describes a user's current per-minute RPM usage.
+type UserRPMStatus struct {
+	UserRPMUsed  int                  `json:"user_rpm_used"`
+	UserRPMLimit int                  `json:"user_rpm_limit"`
+	PerGroup     []UserGroupRPMStatus `json:"per_group"`
+}
+
+// UserGroupRPMStatus describes current per-minute RPM usage for one user/group pair.
+type UserGroupRPMStatus struct {
+	GroupID   int64  `json:"group_id"`
+	GroupName string `json:"group_name"`
+	Used      int    `json:"used"`
+	Limit     int    `json:"limit"`
+	Source    string `json:"source"` // "group" | "override"
+}
+
 // BulkUpdateAccountsResult is the aggregated response for bulk updates.
 type BulkUpdateAccountsResult struct {
 	Success    int                       `json:"success"`
@@ -463,6 +489,8 @@ const (
 	proxyQualityClientUserAgent       = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36"
 )
 
+var ErrRPMStatusUnavailable = infraerrors.New(http.StatusNotImplemented, "RPM_STATUS_UNAVAILABLE", "RPM cache not available")
+
 // adminServiceImpl implements AdminService
 type adminServiceImpl struct {
 	userRepo             UserRepository
@@ -472,6 +500,7 @@ type adminServiceImpl struct {
 	apiKeyRepo           APIKeyRepository
 	redeemCodeRepo       RedeemCodeRepository
 	userGroupRateRepo    UserGroupRateRepository
+	userRPMCache         UserRPMCache
 	billingCacheService  *BillingCacheService
 	proxyProber          ProxyExitInfoProber
 	proxyLatencyCache    ProxyLatencyCache
@@ -496,6 +525,7 @@ func NewAdminService(
 	apiKeyRepo APIKeyRepository,
 	redeemCodeRepo RedeemCodeRepository,
 	userGroupRateRepo UserGroupRateRepository,
+	userRPMCache UserRPMCache,
 	billingCacheService *BillingCacheService,
 	proxyProber ProxyExitInfoProber,
 	proxyLatencyCache ProxyLatencyCache,
@@ -514,6 +544,7 @@ func NewAdminService(
 		apiKeyRepo:           apiKeyRepo,
 		redeemCodeRepo:       redeemCodeRepo,
 		userGroupRateRepo:    userGroupRateRepo,
+		userRPMCache:         userRPMCache,
 		billingCacheService:  billingCacheService,
 		proxyProber:          proxyProber,
 		proxyLatencyCache:    proxyLatencyCache,
@@ -617,6 +648,7 @@ func (s *adminServiceImpl) CreateUser(ctx context.Context, input *CreateUserInpu
 		Role:          RoleUser, // Always create as regular user, never admin
 		Balance:       input.Balance,
 		Concurrency:   input.Concurrency,
+		RPMLimit:      input.RPMLimit,
 		Status:        StatusActive,
 		AllowedGroups: input.AllowedGroups,
 	}
@@ -670,6 +702,7 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda
 	oldConcurrency := user.Concurrency
 	oldStatus := user.Status
 	oldRole := user.Role
+	oldRPMLimit := user.RPMLimit
 
 	if input.Email != "" {
 		user.Email = input.Email
@@ -695,6 +728,10 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda
 		user.Concurrency = *input.Concurrency
 	}
 
+	if input.RPMLimit != nil {
+		user.RPMLimit = *input.RPMLimit
+	}
+
 	if input.AllowedGroups != nil {
 		user.AllowedGroups = *input.AllowedGroups
 	}
@@ -711,7 +748,9 @@ func (s *adminServiceImpl) UpdateUser(ctx context.Context, id int64, input *Upda
 	}
 
 	if s.authCacheInvalidator != nil {
-		if user.Concurrency != oldConcurrency || user.Status != oldStatus || user.Role != oldRole {
+		// RPMLimit 直接参与 billing_cache_service.checkRPM 的三级级联，
+		// 不失效缓存会让修改在一个 L2 TTL 内失去效果。
+		if user.Concurrency != oldConcurrency || user.Status != oldStatus || user.Role != oldRole || user.RPMLimit != oldRPMLimit {
 			s.authCacheInvalidator.InvalidateAuthCacheByUserID(ctx, user.ID)
 		}
 	}
@@ -833,6 +872,81 @@ func (s *adminServiceImpl) GetUserAPIKeys(ctx context.Context, userID int64, pag
 	return keys, result.Total, nil
 }
 
+func (s *adminServiceImpl) GetUserRPMStatus(ctx context.Context, userID int64) (*UserRPMStatus, error) {
+	if s.userRPMCache == nil {
+		return nil, ErrRPMStatusUnavailable
+	}
+
+	user, err := s.userRepo.GetByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	userRPMUsed, err := s.userRPMCache.GetUserRPM(ctx, userID)
+	if err != nil {
+		logger.LegacyPrintf("service.admin", "failed to get user rpm: user_id=%d err=%v", userID, err)
+	}
+
+	keys, _, err := s.GetUserAPIKeys(ctx, userID, 1, 1000, "", "")
+	if err != nil {
+		return nil, err
+	}
+
+	groupIDSet := make(map[int64]struct{})
+	for _, key := range keys {
+		if key.GroupID != nil && *key.GroupID > 0 {
+			groupIDSet[*key.GroupID] = struct{}{}
+		}
+	}
+
+	groupIDs := make([]int64, 0, len(groupIDSet))
+	for groupID := range groupIDSet {
+		groupIDs = append(groupIDs, groupID)
+	}
+	sort.Slice(groupIDs, func(i, j int) bool { return groupIDs[i] < groupIDs[j] })
+
+	var perGroup []UserGroupRPMStatus
+	for _, groupID := range groupIDs {
+		used, getErr := s.userRPMCache.GetUserGroupRPM(ctx, userID, groupID)
+		if getErr != nil {
+			logger.LegacyPrintf("service.admin", "failed to get user group rpm: user_id=%d group_id=%d err=%v", userID, groupID, getErr)
+		}
+
+		entry := UserGroupRPMStatus{
+			GroupID: groupID,
+			Used:    used,
+		}
+
+		if s.groupRepo != nil {
+			if group, groupErr := s.groupRepo.GetByIDLite(ctx, groupID); groupErr == nil && group != nil {
+				entry.GroupName = group.Name
+				entry.Limit = group.RPMLimit
+				entry.Source = "group"
+			} else if groupErr != nil {
+				logger.LegacyPrintf("service.admin", "failed to get group rpm status metadata: group_id=%d err=%v", groupID, groupErr)
+			}
+		}
+
+		if s.userGroupRateRepo != nil {
+			override, overrideErr := s.userGroupRateRepo.GetRPMOverrideByUserAndGroup(ctx, userID, groupID)
+			if overrideErr != nil {
+				logger.LegacyPrintf("service.admin", "failed to get rpm override: user_id=%d group_id=%d err=%v", userID, groupID, overrideErr)
+			} else if override != nil {
+				entry.Limit = *override
+				entry.Source = "override"
+			}
+		}
+
+		perGroup = append(perGroup, entry)
+	}
+
+	return &UserRPMStatus{
+		UserRPMUsed:  userRPMUsed,
+		UserRPMLimit: user.RPMLimit,
+		PerGroup:     perGroup,
+	}, nil
+}
+
 func (s *adminServiceImpl) GetUserUsageStats(ctx context.Context, userID int64, period string) (any, error) {
 	// Return mock data for now
 	return map[string]any{
@@ -1314,6 +1428,7 @@ func (s *adminServiceImpl) CreateGroup(ctx context.Context, input *CreateGroupIn
 		RequirePrivacySet:               input.RequirePrivacySet,
 		DefaultMappedModel:              input.DefaultMappedModel,
 		MessagesDispatchModelConfig:     normalizeOpenAIMessagesDispatchModelConfig(input.MessagesDispatchModelConfig),
+		RPMLimit:                        input.RPMLimit,
 	}
 	sanitizeGroupMessagesDispatchFields(group)
 	if err := s.groupRepo.Create(ctx, group); err != nil {
@@ -1548,12 +1663,19 @@ func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *Upd
 	if input.MessagesDispatchModelConfig != nil {
 		group.MessagesDispatchModelConfig = normalizeOpenAIMessagesDispatchModelConfig(*input.MessagesDispatchModelConfig)
 	}
+	if input.RPMLimit != nil {
+		group.RPMLimit = *input.RPMLimit
+	}
 	sanitizeGroupMessagesDispatchFields(group)
 
 	if err := s.groupRepo.Update(ctx, group); err != nil {
 		return nil, err
 	}
 
+	if s.authCacheInvalidator != nil {
+		s.authCacheInvalidator.InvalidateAuthCacheByGroupID(ctx, id)
+	}
+
 	// 如果指定了复制账号的源分组，同步绑定（替换当前分组的账号）
 	if len(input.CopyAccountsFromGroupIDs) > 0 {
 		// 去重源分组 IDs
@@ -1622,9 +1744,6 @@ func (s *adminServiceImpl) UpdateGroup(ctx context.Context, id int64, input *Upd
 		}
 	}
 
-	if s.authCacheInvalidator != nil {
-		s.authCacheInvalidator.InvalidateAuthCacheByGroupID(ctx, id)
-	}
 	return group, nil
 }
 
@@ -1700,6 +1819,39 @@ func (s *adminServiceImpl) BatchSetGroupRateMultipliers(ctx context.Context, gro
 	return s.userGroupRateRepo.SyncGroupRateMultipliers(ctx, groupID, entries)
 }
 
+func (s *adminServiceImpl) ClearGroupRPMOverrides(ctx context.Context, groupID int64) error {
+	if s.userGroupRateRepo == nil {
+		return nil
+	}
+	if err := s.userGroupRateRepo.ClearGroupRPMOverrides(ctx, groupID); err != nil {
+		return err
+	}
+	// RPM override 已嵌入 auth cache snapshot (v7)，变更后必须失效相关缓存。
+	if s.authCacheInvalidator != nil {
+		s.authCacheInvalidator.InvalidateAuthCacheByGroupID(ctx, groupID)
+	}
+	return nil
+}
+
+func (s *adminServiceImpl) BatchSetGroupRPMOverrides(ctx context.Context, groupID int64, entries []GroupRPMOverrideInput) error {
+	if s.userGroupRateRepo == nil {
+		return nil
+	}
+	for _, e := range entries {
+		if e.RPMOverride != nil && *e.RPMOverride < 0 {
+			return infraerrors.BadRequest("INVALID_RPM_OVERRIDE", fmt.Sprintf("rpm_override must be >= 0 (user_id=%d)", e.UserID))
+		}
+	}
+	if err := s.userGroupRateRepo.SyncGroupRPMOverrides(ctx, groupID, entries); err != nil {
+		return err
+	}
+	// RPM override 已嵌入 auth cache snapshot (v7)，变更后必须失效相关缓存。
+	if s.authCacheInvalidator != nil {
+		s.authCacheInvalidator.InvalidateAuthCacheByGroupID(ctx, groupID)
+	}
+	return nil
+}
+
 func (s *adminServiceImpl) UpdateGroupSortOrders(ctx context.Context, updates []GroupSortOrderUpdate) error {
 	return s.groupRepo.UpdateSortOrders(ctx, updates)
 }

backend/internal/service/admin_service_group_rate_test.go

@@ -5,8 +5,10 @@ package service
 import (
 	"context"
 	"errors"
+	"net/http"
 	"testing"
 
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
 	"github.com/stretchr/testify/require"
 )
 
@@ -21,6 +23,10 @@ type userGroupRateRepoStubForGroupRate struct {
 	syncedGroupID int64
 	syncedEntries []GroupRateMultiplierInput
 	syncGroupErr  error
+
+	rpmSyncedGroupID int64
+	rpmSyncedEntries []GroupRPMOverrideInput
+	rpmSyncErr       error
 }
 
 func (s *userGroupRateRepoStubForGroupRate) GetByUserID(_ context.Context, _ int64) (map[int64]float64, error) {
@@ -31,6 +37,10 @@ func (s *userGroupRateRepoStubForGroupRate) GetByUserAndGroup(_ context.Context,
 	panic("unexpected GetByUserAndGroup call")
 }
 
+func (s *userGroupRateRepoStubForGroupRate) GetRPMOverrideByUserAndGroup(_ context.Context, _, _ int64) (*int, error) {
+	panic("unexpected GetRPMOverrideByUserAndGroup call")
+}
+
 func (s *userGroupRateRepoStubForGroupRate) GetByGroupID(_ context.Context, groupID int64) ([]UserGroupRateEntry, error) {
 	if s.getByGroupIDErr != nil {
 		return nil, s.getByGroupIDErr
@@ -48,6 +58,16 @@ func (s *userGroupRateRepoStubForGroupRate) SyncGroupRateMultipliers(_ context.C
 	return s.syncGroupErr
 }
 
+func (s *userGroupRateRepoStubForGroupRate) SyncGroupRPMOverrides(_ context.Context, groupID int64, entries []GroupRPMOverrideInput) error {
+	s.rpmSyncedGroupID = groupID
+	s.rpmSyncedEntries = entries
+	return s.rpmSyncErr
+}
+
+func (s *userGroupRateRepoStubForGroupRate) ClearGroupRPMOverrides(_ context.Context, _ int64) error {
+	panic("unexpected ClearGroupRPMOverrides call")
+}
+
 func (s *userGroupRateRepoStubForGroupRate) DeleteByGroupID(_ context.Context, groupID int64) error {
 	s.deletedGroupIDs = append(s.deletedGroupIDs, groupID)
 	return s.deleteByGroupErr
@@ -62,8 +82,8 @@ func TestAdminService_GetGroupRateMultipliers(t *testing.T) {
 		repo := &userGroupRateRepoStubForGroupRate{
 			getByGroupIDData: map[int64][]UserGroupRateEntry{
 				10: {
-					{UserID: 1, UserName: "alice", UserEmail: "alice@test.com", RateMultiplier: 1.5},
-					{UserID: 2, UserName: "bob", UserEmail: "bob@test.com", RateMultiplier: 0.8},
+					{UserID: 1, UserName: "alice", UserEmail: "alice@test.com", RateMultiplier: ptrFloat(1.5)},
+					{UserID: 2, UserName: "bob", UserEmail: "bob@test.com", RateMultiplier: ptrFloat(0.8)},
 				},
 			},
 		}
@@ -74,9 +94,11 @@ func TestAdminService_GetGroupRateMultipliers(t *testing.T) {
 		require.Len(t, entries, 2)
 		require.Equal(t, int64(1), entries[0].UserID)
 		require.Equal(t, "alice", entries[0].UserName)
-		require.Equal(t, 1.5, entries[0].RateMultiplier)
+		require.NotNil(t, entries[0].RateMultiplier)
+		require.Equal(t, 1.5, *entries[0].RateMultiplier)
 		require.Equal(t, int64(2), entries[1].UserID)
-		require.Equal(t, 0.8, entries[1].RateMultiplier)
+		require.NotNil(t, entries[1].RateMultiplier)
+		require.Equal(t, 0.8, *entries[1].RateMultiplier)
 	})
 
 	t.Run("returns nil when repo is nil", func(t *testing.T) {
@@ -174,3 +196,30 @@ func TestAdminService_BatchSetGroupRateMultipliers(t *testing.T) {
 		require.Contains(t, err.Error(), "sync failed")
 	})
 }
+
+func TestAdminService_BatchSetGroupRPMOverrides(t *testing.T) {
+	t.Run("syncs entries to repo", func(t *testing.T) {
+		repo := &userGroupRateRepoStubForGroupRate{}
+		svc := &adminServiceImpl{userGroupRateRepo: repo}
+		override := 20
+		entries := []GroupRPMOverrideInput{{UserID: 2, RPMOverride: &override}}
+
+		err := svc.BatchSetGroupRPMOverrides(context.Background(), 10, entries)
+		require.NoError(t, err)
+		require.Equal(t, int64(10), repo.rpmSyncedGroupID)
+		require.Equal(t, entries, repo.rpmSyncedEntries)
+	})
+
+	t.Run("rejects negative override as bad request", func(t *testing.T) {
+		repo := &userGroupRateRepoStubForGroupRate{}
+		svc := &adminServiceImpl{userGroupRateRepo: repo}
+		negative := -1
+
+		err := svc.BatchSetGroupRPMOverrides(context.Background(), 10, []GroupRPMOverrideInput{
+			{UserID: 2, RPMOverride: &negative},
+		})
+		require.Error(t, err)
+		require.Equal(t, http.StatusBadRequest, infraerrors.Code(err))
+		require.Zero(t, repo.rpmSyncedGroupID)
+	})
+}

backend/internal/service/admin_service_group_test.go

@@ -266,6 +266,31 @@ func TestAdminService_UpdateGroup_PartialImagePricing(t *testing.T) {
 	require.Nil(t, repo.updated.ImagePrice4K)
 }
 
+func TestAdminService_UpdateGroup_InvalidatesAuthCacheOnRPMLimitChange(t *testing.T) {
+	existingGroup := &Group{
+		ID:       1,
+		Name:     "existing-group",
+		Platform: PlatformAnthropic,
+		Status:   StatusActive,
+		RPMLimit: 10,
+	}
+	repo := &groupRepoStubForAdmin{getByID: existingGroup}
+	invalidator := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{
+		groupRepo:            repo,
+		authCacheInvalidator: invalidator,
+	}
+
+	rpmLimit := 60
+	group, err := svc.UpdateGroup(context.Background(), 1, &UpdateGroupInput{
+		RPMLimit: &rpmLimit,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, group)
+	require.Equal(t, 60, repo.updated.RPMLimit)
+	require.Equal(t, []int64{1}, invalidator.groupIDs, "分组 RPMLimit 写入 auth snapshot，变更后必须失效 API Key 认证缓存")
+}
+
 func TestAdminService_CreateGroup_NormalizesMessagesDispatchModelConfig(t *testing.T) {
 	repo := &groupRepoStubForAdmin{}
 	svc := &adminServiceImpl{groupRepo: repo}

backend/internal/service/admin_service_list_users_test.go

@@ -89,6 +89,10 @@ func (s *userGroupRateRepoStubForListUsers) GetByUserAndGroup(_ context.Context,
 	panic("unexpected GetByUserAndGroup call")
 }
 
+func (s *userGroupRateRepoStubForListUsers) GetRPMOverrideByUserAndGroup(_ context.Context, _, _ int64) (*int, error) {
+	panic("unexpected GetRPMOverrideByUserAndGroup call")
+}
+
 func (s *userGroupRateRepoStubForListUsers) SyncUserGroupRates(_ context.Context, userID int64, rates map[int64]*float64) error {
 	panic("unexpected SyncUserGroupRates call")
 }
@@ -101,6 +105,14 @@ func (s *userGroupRateRepoStubForListUsers) SyncGroupRateMultipliers(_ context.C
 	panic("unexpected SyncGroupRateMultipliers call")
 }
 
+func (s *userGroupRateRepoStubForListUsers) SyncGroupRPMOverrides(_ context.Context, _ int64, _ []GroupRPMOverrideInput) error {
+	panic("unexpected SyncGroupRPMOverrides call")
+}
+
+func (s *userGroupRateRepoStubForListUsers) ClearGroupRPMOverrides(_ context.Context, _ int64) error {
+	panic("unexpected ClearGroupRPMOverrides call")
+}
+
 func (s *userGroupRateRepoStubForListUsers) DeleteByGroupID(_ context.Context, _ int64) error {
 	panic("unexpected DeleteByGroupID call")
 }

backend/internal/service/admin_service_rpm_status_test.go

@@ -0,0 +1,112 @@
+//go:build unit
+
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/stretchr/testify/require"
+)
+
+type rpmStatusUserRepoStub struct {
+	UserRepository
+	user *User
+}
+
+func (s *rpmStatusUserRepoStub) GetByID(_ context.Context, _ int64) (*User, error) {
+	return s.user, nil
+}
+
+type rpmStatusAPIKeyRepoStub struct {
+	APIKeyRepository
+	keys []APIKey
+}
+
+func (s *rpmStatusAPIKeyRepoStub) ListByUserID(_ context.Context, _ int64, _ pagination.PaginationParams, _ APIKeyListFilters) ([]APIKey, *pagination.PaginationResult, error) {
+	return s.keys, &pagination.PaginationResult{Total: int64(len(s.keys))}, nil
+}
+
+type rpmStatusGroupRepoStub struct {
+	GroupRepository
+	groups map[int64]*Group
+}
+
+func (s *rpmStatusGroupRepoStub) GetByIDLite(_ context.Context, id int64) (*Group, error) {
+	return s.groups[id], nil
+}
+
+type rpmStatusRateRepoStub struct {
+	UserGroupRateRepository
+	overrides map[int64]*int
+}
+
+func (s *rpmStatusRateRepoStub) GetRPMOverrideByUserAndGroup(_ context.Context, _, groupID int64) (*int, error) {
+	return s.overrides[groupID], nil
+}
+
+type rpmStatusCacheStub struct {
+	UserRPMCache
+	userUsed  int
+	groupUsed map[int64]int
+}
+
+func (s *rpmStatusCacheStub) IncrementUserGroupRPM(context.Context, int64, int64) (int, error) {
+	return 0, nil
+}
+
+func (s *rpmStatusCacheStub) IncrementUserRPM(context.Context, int64) (int, error) {
+	return 0, nil
+}
+
+func (s *rpmStatusCacheStub) GetUserGroupRPM(_ context.Context, _, groupID int64) (int, error) {
+	return s.groupUsed[groupID], nil
+}
+
+func (s *rpmStatusCacheStub) GetUserRPM(context.Context, int64) (int, error) {
+	return s.userUsed, nil
+}
+
+func TestAdminService_GetUserRPMStatus_AggregatesUserAndGroupLimits(t *testing.T) {
+	groupOneID := int64(1)
+	groupTwoID := int64(2)
+	override := 7
+	svc := &adminServiceImpl{
+		userRepo: &rpmStatusUserRepoStub{user: &User{
+			ID:       42,
+			RPMLimit: 20,
+		}},
+		apiKeyRepo: &rpmStatusAPIKeyRepoStub{keys: []APIKey{
+			{ID: 100, UserID: 42, GroupID: &groupTwoID},
+			{ID: 101, UserID: 42, GroupID: &groupOneID},
+			{ID: 102, UserID: 42, GroupID: &groupTwoID},
+			{ID: 103, UserID: 42},
+		}},
+		groupRepo: &rpmStatusGroupRepoStub{groups: map[int64]*Group{
+			groupOneID: {ID: groupOneID, Name: "group-one", RPMLimit: 10},
+			groupTwoID: {ID: groupTwoID, Name: "group-two", RPMLimit: 60},
+		}},
+		userGroupRateRepo: &rpmStatusRateRepoStub{overrides: map[int64]*int{
+			groupTwoID: &override,
+		}},
+		userRPMCache: &rpmStatusCacheStub{
+			userUsed: 5,
+			groupUsed: map[int64]int{
+				groupOneID: 3,
+				groupTwoID: 4,
+			},
+		},
+	}
+
+	status, err := svc.GetUserRPMStatus(context.Background(), 42)
+	require.NoError(t, err)
+	require.Equal(t, &UserRPMStatus{
+		UserRPMUsed:  5,
+		UserRPMLimit: 20,
+		PerGroup: []UserGroupRPMStatus{
+			{GroupID: groupOneID, GroupName: "group-one", Used: 3, Limit: 10, Source: "group"},
+			{GroupID: groupTwoID, GroupName: "group-two", Used: 4, Limit: 7, Source: "override"},
+		},
+	}, status)
+}

backend/internal/service/admin_service_update_user_rpm_test.go

@@ -0,0 +1,69 @@
+//go:build unit
+
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// rpmUserRepoStub 复用 admin_service_update_balance_test.go 的基础 stub 结构，
+// 只在 Update 时把入参克隆一份，便于断言修改后的 RPMLimit。
+type rpmUserRepoStub struct {
+	*userRepoStub
+	lastUpdated *User
+}
+
+func (s *rpmUserRepoStub) Update(_ context.Context, user *User) error {
+	if user == nil {
+		return nil
+	}
+	clone := *user
+	s.lastUpdated = &clone
+	if s.userRepoStub != nil {
+		s.userRepoStub.user = &clone
+	}
+	return nil
+}
+
+func TestAdminService_UpdateUser_InvalidatesAuthCacheOnRPMLimitChange(t *testing.T) {
+	base := &userRepoStub{user: &User{ID: 42, Email: "u@example.com", RPMLimit: 10}}
+	repo := &rpmUserRepoStub{userRepoStub: base}
+	invalidator := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{
+		userRepo:             repo,
+		redeemCodeRepo:       &redeemRepoStub{},
+		authCacheInvalidator: invalidator,
+	}
+
+	newRPM := 60
+	updated, err := svc.UpdateUser(context.Background(), 42, &UpdateUserInput{
+		RPMLimit: &newRPM,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, updated)
+	require.Equal(t, 60, updated.RPMLimit)
+	require.Equal(t, []int64{42}, invalidator.userIDs, "仅修改 RPMLimit 也应失效 API Key 认证缓存")
+}
+
+func TestAdminService_UpdateUser_NoInvalidateWhenRPMLimitUnchanged(t *testing.T) {
+	base := &userRepoStub{user: &User{ID: 42, Email: "u@example.com", RPMLimit: 10, Username: "old"}}
+	repo := &rpmUserRepoStub{userRepoStub: base}
+	invalidator := &authCacheInvalidatorStub{}
+	svc := &adminServiceImpl{
+		userRepo:             repo,
+		redeemCodeRepo:       &redeemRepoStub{},
+		authCacheInvalidator: invalidator,
+	}
+
+	newName := "new"
+	sameRPM := 10
+	_, err := svc.UpdateUser(context.Background(), 42, &UpdateUserInput{
+		Username: &newName,
+		RPMLimit: &sameRPM,
+	})
+	require.NoError(t, err)
+	require.Empty(t, invalidator.userIDs, "只改 username 不应触发认证缓存失效")
+}

backend/internal/service/api_key_auth_cache.go

@@ -43,6 +43,13 @@ type APIKeyAuthUserSnapshot struct {
 	BalanceNotifyThreshold     *float64           `json:"balance_notify_threshold,omitempty"`
 	BalanceNotifyExtraEmails   []NotifyEmailEntry `json:"balance_notify_extra_emails,omitempty"`
 	TotalRecharged             float64            `json:"total_recharged"`
+
+	// RPMLimit 用户级每分钟请求数上限（0 = 不限制）；用于 billing_cache_service.checkRPM 兜底判断。
+	RPMLimit int `json:"rpm_limit"`
+
+	// UserGroupRPMOverride 该 API Key 对应的 (user, group) 专属 RPM 覆盖值。
+	// nil = 无 override（回退到 group/user 级）；0 = 不限流；>0 = 专属上限。
+	UserGroupRPMOverride *int `json:"user_group_rpm_override,omitempty"`
 }
 
 // APIKeyAuthGroupSnapshot 分组快照
@@ -76,6 +83,9 @@ type APIKeyAuthGroupSnapshot struct {
 	AllowMessagesDispatch       bool                              `json:"allow_messages_dispatch"`
 	DefaultMappedModel          string                            `json:"default_mapped_model,omitempty"`
 	MessagesDispatchModelConfig OpenAIMessagesDispatchModelConfig `json:"messages_dispatch_model_config,omitempty"`
+
+	// RPMLimit 分组级每分钟请求数上限（0 = 不限制）；用于 billing_cache_service.checkRPM 级联判断。
+	RPMLimit int `json:"rpm_limit"`
 }
 
 // APIKeyAuthCacheEntry 缓存条目，支持负缓存

backend/internal/service/api_key_auth_cache_impl.go

@@ -14,7 +14,7 @@ import (
 	"github.com/dgraph-io/ristretto"
 )
 
-const apiKeyAuthSnapshotVersion = 5 // v5: added TotalRecharged for percentage threshold
+const apiKeyAuthSnapshotVersion = 7 // v7: added UserGroupRPMOverride on user snapshot
 
 type apiKeyAuthCacheConfig struct {
 	l1Size        int
@@ -176,7 +176,7 @@ func (s *APIKeyService) loadAuthCacheEntry(ctx context.Context, key, cacheKey st
 		return nil, fmt.Errorf("get api key: %w", err)
 	}
 	apiKey.Key = key
-	snapshot := s.snapshotFromAPIKey(apiKey)
+	snapshot := s.snapshotFromAPIKey(ctx, apiKey)
 	if snapshot == nil {
 		return nil, fmt.Errorf("get api key: %w", ErrAPIKeyNotFound)
 	}
@@ -201,7 +201,7 @@ func (s *APIKeyService) applyAuthCacheEntry(key string, entry *APIKeyAuthCacheEn
 	return s.snapshotToAPIKey(key, entry.Snapshot), true, nil
 }
 
-func (s *APIKeyService) snapshotFromAPIKey(apiKey *APIKey) *APIKeyAuthSnapshot {
+func (s *APIKeyService) snapshotFromAPIKey(ctx context.Context, apiKey *APIKey) *APIKeyAuthSnapshot {
 	if apiKey == nil || apiKey.User == nil {
 		return nil
 	}
@@ -232,8 +232,18 @@ func (s *APIKeyService) snapshotFromAPIKey(apiKey *APIKey) *APIKeyAuthSnapshot {
 			BalanceNotifyThreshold:     apiKey.User.BalanceNotifyThreshold,
 			BalanceNotifyExtraEmails:   apiKey.User.BalanceNotifyExtraEmails,
 			TotalRecharged:             apiKey.User.TotalRecharged,
+			RPMLimit:                   apiKey.User.RPMLimit,
 		},
 	}
+
+	// 填充 (user, group) RPM override —— snapshot 构建时查一次 DB，后续请求零 DB 往返。
+	if apiKey.GroupID != nil && *apiKey.GroupID > 0 && s.userGroupRateRepo != nil {
+		override, err := s.userGroupRateRepo.GetRPMOverrideByUserAndGroup(ctx, apiKey.UserID, *apiKey.GroupID)
+		if err == nil && override != nil {
+			snapshot.User.UserGroupRPMOverride = override
+		}
+		// 查询失败或无 override 时留 nil，checkRPM 会回退到 DB 查询
+	}
 	if apiKey.Group != nil {
 		snapshot.Group = &APIKeyAuthGroupSnapshot{
 			ID:                              apiKey.Group.ID,
@@ -258,6 +268,7 @@ func (s *APIKeyService) snapshotFromAPIKey(apiKey *APIKey) *APIKeyAuthSnapshot {
 			AllowMessagesDispatch:           apiKey.Group.AllowMessagesDispatch,
 			DefaultMappedModel:              apiKey.Group.DefaultMappedModel,
 			MessagesDispatchModelConfig:     apiKey.Group.MessagesDispatchModelConfig,
+			RPMLimit:                        apiKey.Group.RPMLimit,
 		}
 	}
 	return snapshot
@@ -294,6 +305,8 @@ func (s *APIKeyService) snapshotToAPIKey(key string, snapshot *APIKeyAuthSnapsho
 			BalanceNotifyThreshold:     snapshot.User.BalanceNotifyThreshold,
 			BalanceNotifyExtraEmails:   snapshot.User.BalanceNotifyExtraEmails,
 			TotalRecharged:             snapshot.User.TotalRecharged,
+			RPMLimit:                   snapshot.User.RPMLimit,
+			UserGroupRPMOverride:       snapshot.User.UserGroupRPMOverride,
 		},
 	}
 	if snapshot.Group != nil {
@@ -321,6 +334,7 @@ func (s *APIKeyService) snapshotToAPIKey(key string, snapshot *APIKeyAuthSnapsho
 			AllowMessagesDispatch:           snapshot.Group.AllowMessagesDispatch,
 			DefaultMappedModel:              snapshot.Group.DefaultMappedModel,
 			MessagesDispatchModelConfig:     snapshot.Group.MessagesDispatchModelConfig,
+			RPMLimit:                        snapshot.Group.RPMLimit,
 		}
 	}
 	s.compileAPIKeyIPRules(apiKey)

backend/internal/service/api_key_service_cache_test.go

@@ -263,7 +263,7 @@ func TestAPIKeyService_SnapshotRoundTrip_PreservesMessagesDispatchModelConfig(t
 		},
 	}
 
-	snapshot := svc.snapshotFromAPIKey(apiKey)
+	snapshot := svc.snapshotFromAPIKey(context.Background(), apiKey)
 	roundTrip := svc.snapshotToAPIKey(apiKey.Key, snapshot)
 
 	require.NotNil(t, roundTrip)

backend/internal/service/auth_service.go

@@ -196,6 +196,12 @@ func (s *AuthService) RegisterWithVerification(ctx context.Context, email, passw
 
 	grantPlan := s.resolveSignupGrantPlan(ctx, "email")
 
+	// 新用户默认 RPM（0 = 不限制）。注册时写入，后续作为用户级兜底。
+	var defaultRPMLimit int
+	if s.settingService != nil {
+		defaultRPMLimit = s.settingService.GetDefaultUserRPMLimit(ctx)
+	}
+
 	// 创建用户
 	user := &User{
 		Email:        email,
@@ -203,6 +209,7 @@ func (s *AuthService) RegisterWithVerification(ctx context.Context, email, passw
 		Role:         RoleUser,
 		Balance:      grantPlan.Balance,
 		Concurrency:  grantPlan.Concurrency,
+		RPMLimit:     defaultRPMLimit,
 		Status:       StatusActive,
 	}
 
@@ -481,6 +488,10 @@ func (s *AuthService) LoginOrRegisterOAuth(ctx context.Context, email, username
 
 			signupSource := inferLegacySignupSource(email)
 			grantPlan := s.resolveSignupGrantPlan(ctx, signupSource)
+			var defaultRPMLimit int
+			if s.settingService != nil {
+				defaultRPMLimit = s.settingService.GetDefaultUserRPMLimit(ctx)
+			}
 
 			newUser := &User{
 				Email:        email,
@@ -489,6 +500,7 @@ func (s *AuthService) LoginOrRegisterOAuth(ctx context.Context, email, username
 				Role:         RoleUser,
 				Balance:      grantPlan.Balance,
 				Concurrency:  grantPlan.Concurrency,
+				RPMLimit:     defaultRPMLimit,
 				Status:       StatusActive,
 				SignupSource: signupSource,
 			}
@@ -592,6 +604,10 @@ func (s *AuthService) LoginOrRegisterOAuthWithTokenPair(ctx context.Context, ema
 
 			signupSource := inferLegacySignupSource(email)
 			grantPlan := s.resolveSignupGrantPlan(ctx, signupSource)
+			var defaultRPMLimit int
+			if s.settingService != nil {
+				defaultRPMLimit = s.settingService.GetDefaultUserRPMLimit(ctx)
+			}
 
 			newUser := &User{
 				Email:        email,
@@ -600,6 +616,7 @@ func (s *AuthService) LoginOrRegisterOAuthWithTokenPair(ctx context.Context, ema
 				Role:         RoleUser,
 				Balance:      grantPlan.Balance,
 				Concurrency:  grantPlan.Concurrency,
+				RPMLimit:     defaultRPMLimit,
 				Status:       StatusActive,
 				SignupSource: signupSource,
 			}

backend/internal/service/billing_cache_service.go

@@ -20,6 +20,9 @@ import (
 var (
 	ErrSubscriptionInvalid       = infraerrors.Forbidden("SUBSCRIPTION_INVALID", "subscription is invalid or expired")
 	ErrBillingServiceUnavailable = infraerrors.ServiceUnavailable("BILLING_SERVICE_ERROR", "Billing service temporarily unavailable. Please retry later.")
+	// RPM 超限错误。gateway_handler 负责映射为 HTTP 429。
+	ErrGroupRPMExceeded = infraerrors.TooManyRequests("GROUP_RPM_EXCEEDED", "group requests-per-minute limit exceeded")
+	ErrUserRPMExceeded  = infraerrors.TooManyRequests("USER_RPM_EXCEEDED", "user requests-per-minute limit exceeded")
 )
 
 // subscriptionCacheData 订阅缓存数据结构（内部使用）
@@ -87,6 +90,8 @@ type BillingCacheService struct {
 	userRepo              UserRepository
 	subRepo               UserSubscriptionRepository
 	apiKeyRateLimitLoader apiKeyRateLimitLoader
+	userRPMCache          UserRPMCache
+	userGroupRateRepo     UserGroupRateRepository
 	cfg                   *config.Config
 	circuitBreaker        *billingCircuitBreaker
 
@@ -104,12 +109,22 @@ type BillingCacheService struct {
 }
 
 // NewBillingCacheService 创建计费缓存服务
-func NewBillingCacheService(cache BillingCache, userRepo UserRepository, subRepo UserSubscriptionRepository, apiKeyRepo APIKeyRepository, cfg *config.Config) *BillingCacheService {
+func NewBillingCacheService(
+	cache BillingCache,
+	userRepo UserRepository,
+	subRepo UserSubscriptionRepository,
+	apiKeyRepo APIKeyRepository,
+	userRPMCache UserRPMCache,
+	userGroupRateRepo UserGroupRateRepository,
+	cfg *config.Config,
+) *BillingCacheService {
 	svc := &BillingCacheService{
 		cache:                 cache,
 		userRepo:              userRepo,
 		subRepo:               subRepo,
 		apiKeyRateLimitLoader: apiKeyRepo,
+		userRPMCache:          userRPMCache,
+		userGroupRateRepo:     userGroupRateRepo,
 		cfg:                   cfg,
 	}
 	svc.circuitBreaker = newBillingCircuitBreaker(cfg.Billing.CircuitBreaker)
@@ -664,6 +679,95 @@ func (s *BillingCacheService) CheckBillingEligibility(ctx context.Context, user
 		}
 	}
 
+	// RPM 限流：级联回落（Override → Group → User），放在最后以避免为注定失败的请求增加计数。
+	if err := s.checkRPM(ctx, user, group); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// checkRPM 执行并行 RPM 限流，所有适用的限制同时生效，任一超限即拒绝：
+//
+//  1. (用户, 分组) rpm_override       — 最细粒度：管理员为特定用户在特定分组设定的专属限额。
+//     override=0 表示该用户在该分组免检（绿灯），但 user 级全局上限仍然生效。
+//  2. group.rpm_limit                 — 分组级：该分组的统一 RPM 容量（仅当无 override 时生效）。
+//  3. user.rpm_limit                  — 用户级全局硬上限：无论 override/group 如何配置，始终生效。
+//
+// 与旧版"级联互斥"设计不同，新版确保 user.rpm_limit 作为全局天花板不会被 group 或 override 覆盖。
+// Redis 故障一律 fail-open（打 warning，不阻塞业务）。
+func (s *BillingCacheService) checkRPM(ctx context.Context, user *User, group *Group) error {
+	if s == nil || s.userRPMCache == nil || user == nil {
+		return nil
+	}
+
+	// ── 第一层：分组级检查（override 或 group.rpm_limit） ──
+	if group != nil {
+		// 解析 override：优先从 auth cache snapshot，nil 时回退 DB。
+		var override *int
+		if user.UserGroupRPMOverride != nil {
+			override = user.UserGroupRPMOverride
+		} else if s.userGroupRateRepo != nil {
+			dbOverride, err := s.userGroupRateRepo.GetRPMOverrideByUserAndGroup(ctx, user.ID, group.ID)
+			if err != nil {
+				logger.LegacyPrintf(
+					"service.billing_cache",
+					"Warning: rpm override lookup failed for user=%d group=%d: %v",
+					user.ID, group.ID, err,
+				)
+			} else {
+				override = dbOverride
+			}
+		}
+
+		if override != nil {
+			// override=0 → 该用户在该分组免检（但 user 级仍会在下面检查）。
+			if *override > 0 {
+				count, incErr := s.userRPMCache.IncrementUserGroupRPM(ctx, user.ID, group.ID)
+				if incErr != nil {
+					logger.LegacyPrintf(
+						"service.billing_cache",
+						"Warning: rpm increment (override) failed for user=%d group=%d: %v",
+						user.ID, group.ID, incErr,
+					)
+					// fail-open
+				} else if count > *override {
+					return ErrGroupRPMExceeded
+				}
+			}
+			// override 命中后跳过 group.rpm_limit（override 替代 group），但不 return——继续检查 user 级。
+		} else if group.RPMLimit > 0 {
+			// 无 override，检查 group.rpm_limit。
+			count, err := s.userRPMCache.IncrementUserGroupRPM(ctx, user.ID, group.ID)
+			if err != nil {
+				logger.LegacyPrintf(
+					"service.billing_cache",
+					"Warning: rpm increment (group) failed for user=%d group=%d: %v",
+					user.ID, group.ID, err,
+				)
+				// fail-open
+			} else if count > group.RPMLimit {
+				return ErrGroupRPMExceeded
+			}
+		}
+	}
+
+	// ── 第二层：用户级全局硬上限（始终生效） ──
+	if user.RPMLimit > 0 {
+		count, err := s.userRPMCache.IncrementUserRPM(ctx, user.ID)
+		if err != nil {
+			logger.LegacyPrintf(
+				"service.billing_cache",
+				"Warning: rpm increment (user) failed for user=%d: %v",
+				user.ID, err,
+			)
+			return nil // fail-open
+		}
+		if count > user.RPMLimit {
+			return ErrUserRPMExceeded
+		}
+	}
+
 	return nil
 }
 

backend/internal/service/billing_cache_service_rpm_test.go

@@ -0,0 +1,253 @@
+//go:build unit
+
+package service
+
+import (
+	"context"
+	"errors"
+	"sync/atomic"
+	"testing"
+
+	"github.com/Wei-Shaw/sub2api/internal/config"
+	"github.com/stretchr/testify/require"
+)
+
+// userRPMCacheStub 记录每种计数器被调用的次数，并可注入返回值与错误。
+type userRPMCacheStub struct {
+	userGroupCalls int32
+	userCalls      int32
+
+	userGroupCounts []int // 依次返回的计数值
+	userGroupErr    error
+	userCounts      []int
+	userErr         error
+}
+
+func (s *userRPMCacheStub) IncrementUserGroupRPM(_ context.Context, _, _ int64) (int, error) {
+	idx := int(atomic.AddInt32(&s.userGroupCalls, 1)) - 1
+	if s.userGroupErr != nil {
+		return 0, s.userGroupErr
+	}
+	if idx < len(s.userGroupCounts) {
+		return s.userGroupCounts[idx], nil
+	}
+	return 1, nil
+}
+
+func (s *userRPMCacheStub) IncrementUserRPM(_ context.Context, _ int64) (int, error) {
+	idx := int(atomic.AddInt32(&s.userCalls, 1)) - 1
+	if s.userErr != nil {
+		return 0, s.userErr
+	}
+	if idx < len(s.userCounts) {
+		return s.userCounts[idx], nil
+	}
+	return 1, nil
+}
+
+func (s *userRPMCacheStub) GetUserGroupRPM(_ context.Context, _, _ int64) (int, error) {
+	return 0, nil
+}
+
+func (s *userRPMCacheStub) GetUserRPM(_ context.Context, _ int64) (int, error) {
+	return 0, nil
+}
+
+// rpmOverrideRepoStub 专用于 checkRPM 分支测试，只实现必要方法。
+type rpmOverrideRepoStub struct {
+	UserGroupRateRepository
+
+	override *int
+	err      error
+	calls    int32
+}
+
+func (s *rpmOverrideRepoStub) GetRPMOverrideByUserAndGroup(_ context.Context, _, _ int64) (*int, error) {
+	atomic.AddInt32(&s.calls, 1)
+	if s.err != nil {
+		return nil, s.err
+	}
+	return s.override, nil
+}
+
+func newBillingServiceForRPM(t *testing.T, cache UserRPMCache, rateRepo UserGroupRateRepository) *BillingCacheService {
+	t.Helper()
+	// 用 nil BillingCache 走 "无缓存" 分支，避免 CheckBillingEligibility 副作用。
+	// 我们只直接测 checkRPM。
+	svc := NewBillingCacheService(nil, nil, nil, nil, cache, rateRepo, &config.Config{})
+	t.Cleanup(svc.Stop)
+	return svc
+}
+
+func TestBillingCacheService_CheckRPM_OverrideTakesPrecedenceOverGroup(t *testing.T) {
+	override := 2
+	// user-group 计数: 1, 2, 3；user 计数: 默认返回 1（远小于 RPMLimit=100，不干扰）
+	cache := &userRPMCacheStub{userGroupCounts: []int{1, 2, 3}}
+	repo := &rpmOverrideRepoStub{override: &override}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 100} // 全局上限设高，不干扰 override 测试
+	group := &Group{ID: 10, RPMLimit: 100}
+
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, group), ErrGroupRPMExceeded)
+
+	require.EqualValues(t, 3, atomic.LoadInt32(&cache.userGroupCalls), "override 命中分支应走 user-group 计数")
+	// 并行设计：前 2 次 override 未超→继续检查 user；第 3 次 override 超了→直接 return，不检查 user
+	require.EqualValues(t, 2, atomic.LoadInt32(&cache.userCalls), "override 超限前 user 计数器应被调用")
+	require.EqualValues(t, 3, atomic.LoadInt32(&repo.calls))
+}
+
+func TestBillingCacheService_CheckRPM_UserLimitIsGlobalHardCap(t *testing.T) {
+	override := 100 // override 很高
+	// user-group 计数: 默认返回 1（远小于 override）；user 计数: 1, 2, 3
+	cache := &userRPMCacheStub{userCounts: []int{1, 2, 3}}
+	repo := &rpmOverrideRepoStub{override: &override}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 2} // 全局硬上限=2，应覆盖 override=100
+	group := &Group{ID: 10, RPMLimit: 100}
+
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, group), ErrUserRPMExceeded, "user 全局硬上限应优先于 override")
+}
+
+func TestBillingCacheService_CheckRPM_OverrideZeroSkipsGroupButUserStillApplies(t *testing.T) {
+	zero := 0
+	// user 计数: 依次返回 1..6
+	cache := &userRPMCacheStub{userCounts: []int{1, 2, 3, 4, 5, 6}}
+	repo := &rpmOverrideRepoStub{override: &zero}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 5}
+	group := &Group{ID: 10, RPMLimit: 100}
+
+	// override=0 跳过分组计数，但 user.RPMLimit=5 仍生效
+	for i := 0; i < 5; i++ {
+		require.NoError(t, svc.checkRPM(context.Background(), user, group), "request %d should pass", i+1)
+	}
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, group), ErrUserRPMExceeded,
+		"override=0 跳过分组但 user 全局上限仍应生效")
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userGroupCalls), "override=0 不应触发分组计数器")
+	require.EqualValues(t, 6, atomic.LoadInt32(&cache.userCalls), "user 计数器应被调用")
+}
+
+func TestBillingCacheService_CheckRPM_OverrideZeroAndUserZeroIsFullyUnlimited(t *testing.T) {
+	zero := 0
+	cache := &userRPMCacheStub{}
+	repo := &rpmOverrideRepoStub{override: &zero}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 0} // user 也不限
+	group := &Group{ID: 10, RPMLimit: 100}
+
+	for i := 0; i < 50; i++ {
+		require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	}
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userGroupCalls), "override=0 不触发分组计数")
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userCalls), "user.RPMLimit=0 也不触发用户计数")
+}
+
+func TestBillingCacheService_CheckRPM_NilOverrideFallsThroughToGroup(t *testing.T) {
+	// user-group 计数: 5, 6；user 计数: 默认 1（不干扰）
+	cache := &userRPMCacheStub{userGroupCounts: []int{5, 6}}
+	repo := &rpmOverrideRepoStub{override: nil}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 999} // 全局上限很高，group 先超
+	group := &Group{ID: 10, RPMLimit: 5}
+
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))                      // ug=5, user=1, 都没超
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, group), ErrGroupRPMExceeded) // ug=6 > 5
+
+	require.EqualValues(t, 2, atomic.LoadInt32(&cache.userGroupCalls))
+	// 并行模式：第 1 次 group 没超 → 继续检查 user；第 2 次 group 超了 → 直接 return，不检查 user
+	require.EqualValues(t, 1, atomic.LoadInt32(&cache.userCalls), "group 未超时 user 也应检查；group 超时直接返回")
+}
+
+func TestBillingCacheService_CheckRPM_OverrideLookupErrorFallsThroughToGroup(t *testing.T) {
+	cache := &userRPMCacheStub{userGroupCounts: []int{3}}
+	repo := &rpmOverrideRepoStub{err: errors.New("db down")}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 0}
+	group := &Group{ID: 10, RPMLimit: 10}
+
+	// override 查询失败后应继续尝试 group 分支（不直接拒绝）
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.EqualValues(t, 1, atomic.LoadInt32(&cache.userGroupCalls))
+	require.EqualValues(t, 1, atomic.LoadInt32(&repo.calls))
+}
+
+func TestBillingCacheService_CheckRPM_UserLevelFallbackWhenGroupUnlimited(t *testing.T) {
+	cache := &userRPMCacheStub{userCounts: []int{1, 2, 3}}
+	repo := &rpmOverrideRepoStub{override: nil}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 2}
+	group := &Group{ID: 10, RPMLimit: 0} // 分组未设限
+
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, group), ErrUserRPMExceeded)
+
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userGroupCalls), "group 未设限时不应 INCR user-group 键")
+	require.EqualValues(t, 3, atomic.LoadInt32(&cache.userCalls))
+}
+
+func TestBillingCacheService_CheckRPM_NoLimitsConfiguredIsNoop(t *testing.T) {
+	cache := &userRPMCacheStub{}
+	repo := &rpmOverrideRepoStub{override: nil}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 0}
+	group := &Group{ID: 10, RPMLimit: 0}
+
+	for i := 0; i < 10; i++ {
+		require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	}
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userGroupCalls))
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userCalls))
+}
+
+func TestBillingCacheService_CheckRPM_RedisErrorFailOpen(t *testing.T) {
+	cache := &userRPMCacheStub{userGroupErr: errors.New("redis unavailable")}
+	repo := &rpmOverrideRepoStub{override: nil}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 0}
+	group := &Group{ID: 10, RPMLimit: 5}
+
+	// Redis 故障时应 fail-open，不拒绝请求
+	require.NoError(t, svc.checkRPM(context.Background(), user, group))
+	require.EqualValues(t, 1, atomic.LoadInt32(&cache.userGroupCalls))
+}
+
+func TestBillingCacheService_CheckRPM_NoGroupUsesUserOnly(t *testing.T) {
+	cache := &userRPMCacheStub{userCounts: []int{1, 2, 3}}
+	repo := &rpmOverrideRepoStub{}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	user := &User{ID: 1, RPMLimit: 2}
+
+	// 无 group（纯用户级限流场景），不应查询 rpm_override。
+	require.NoError(t, svc.checkRPM(context.Background(), user, nil))
+	require.NoError(t, svc.checkRPM(context.Background(), user, nil))
+	require.ErrorIs(t, svc.checkRPM(context.Background(), user, nil), ErrUserRPMExceeded)
+
+	require.EqualValues(t, 0, atomic.LoadInt32(&repo.calls), "无 group 时不应查询 rpm_override")
+	require.EqualValues(t, 3, atomic.LoadInt32(&cache.userCalls))
+}
+
+func TestBillingCacheService_CheckRPM_NilUserIsNoop(t *testing.T) {
+	cache := &userRPMCacheStub{}
+	repo := &rpmOverrideRepoStub{}
+	svc := newBillingServiceForRPM(t, cache, repo)
+
+	require.NoError(t, svc.checkRPM(context.Background(), nil, &Group{ID: 1, RPMLimit: 10}))
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userGroupCalls))
+	require.EqualValues(t, 0, atomic.LoadInt32(&cache.userCalls))
+	require.EqualValues(t, 0, atomic.LoadInt32(&repo.calls))
+}

backend/internal/service/billing_cache_service_singleflight_test.go

@@ -100,7 +100,7 @@ func TestBillingCacheServiceGetUserBalance_Singleflight(t *testing.T) {
 		delay:   80 * time.Millisecond,
 		balance: 12.34,
 	}
-	svc := NewBillingCacheService(cache, userRepo, nil, nil, &config.Config{})
+	svc := NewBillingCacheService(cache, userRepo, nil, nil, nil, nil, &config.Config{})
 	t.Cleanup(svc.Stop)
 
 	const goroutines = 16

backend/internal/service/billing_cache_service_test.go

@@ -70,7 +70,7 @@ func (b *billingCacheWorkerStub) InvalidateAPIKeyRateLimit(ctx context.Context,
 
 func TestBillingCacheServiceQueueHighLoad(t *testing.T) {
 	cache := &billingCacheWorkerStub{}
-	svc := NewBillingCacheService(cache, nil, nil, nil, &config.Config{})
+	svc := NewBillingCacheService(cache, nil, nil, nil, nil, nil, &config.Config{})
 	t.Cleanup(svc.Stop)
 
 	start := time.Now()
@@ -92,7 +92,7 @@ func TestBillingCacheServiceQueueHighLoad(t *testing.T) {
 
 func TestBillingCacheServiceEnqueueAfterStopReturnsFalse(t *testing.T) {
 	cache := &billingCacheWorkerStub{}
-	svc := NewBillingCacheService(cache, nil, nil, nil, &config.Config{})
+	svc := NewBillingCacheService(cache, nil, nil, nil, nil, nil, &config.Config{})
 	svc.Stop()
 
 	enqueued := svc.enqueueCacheWrite(cacheWriteTask{

backend/internal/service/domain_constants.go

@@ -170,9 +170,10 @@ const (
 	SettingKeyCustomEndpoints             = "custom_endpoints"              // 自定义端点列表（JSON 数组）
 
 	// 默认配置
-	SettingKeyDefaultConcurrency   = "default_concurrency"   // 新用户默认并发量
-	SettingKeyDefaultBalance       = "default_balance"       // 新用户默认余额
-	SettingKeyDefaultSubscriptions = "default_subscriptions" // 新用户默认订阅列表（JSON）
+	SettingKeyDefaultConcurrency   = "default_concurrency"    // 新用户默认并发量
+	SettingKeyDefaultBalance       = "default_balance"        // 新用户默认余额
+	SettingKeyDefaultSubscriptions = "default_subscriptions"  // 新用户默认订阅列表（JSON）
+	SettingKeyDefaultUserRPMLimit  = "default_user_rpm_limit" // 新用户默认 RPM 限制（0 = 不限制）
 
 	// 第三方认证来源默认授予配置
 	SettingKeyAuthSourceDefaultEmailBalance            = "auth_source_default_email_balance"

backend/internal/service/group.go

@@ -59,6 +59,10 @@ type Group struct {
 	DefaultMappedModel          string
 	MessagesDispatchModelConfig OpenAIMessagesDispatchModelConfig
 
+	// RPMLimit 分组级每分钟请求数上限（0 = 不限制）。
+	// 一旦设置即接管该分组用户的限流（覆盖用户级 rpm_limit），可被 user-group rpm_override 进一步覆盖。
+	RPMLimit int
+
 	CreatedAt time.Time
 	UpdatedAt time.Time
 

backend/internal/service/setting_service.go

@@ -1060,6 +1060,7 @@ func (s *SettingService) buildSystemSettingsUpdates(ctx context.Context, setting
 	// 默认配置
 	updates[SettingKeyDefaultConcurrency] = strconv.Itoa(settings.DefaultConcurrency)
 	updates[SettingKeyDefaultBalance] = strconv.FormatFloat(settings.DefaultBalance, 'f', 8, 64)
+	updates[SettingKeyDefaultUserRPMLimit] = strconv.Itoa(settings.DefaultUserRPMLimit)
 	defaultSubsJSON, err := json.Marshal(settings.DefaultSubscriptions)
 	if err != nil {
 		return nil, fmt.Errorf("marshal default subscriptions: %w", err)
@@ -1422,6 +1423,18 @@ func (s *SettingService) GetDefaultBalance(ctx context.Context) float64 {
 	return s.cfg.Default.UserBalance
 }
 
+// GetDefaultUserRPMLimit 获取新用户默认 RPM 限制（0 = 不限制）。未配置则返回 0。
+func (s *SettingService) GetDefaultUserRPMLimit(ctx context.Context) int {
+	value, err := s.settingRepo.GetValue(ctx, SettingKeyDefaultUserRPMLimit)
+	if err != nil || value == "" {
+		return 0
+	}
+	if v, err := strconv.Atoi(value); err == nil && v >= 0 {
+		return v
+	}
+	return 0
+}
+
 // GetDefaultSubscriptions 获取新用户默认订阅配置列表。
 func (s *SettingService) GetDefaultSubscriptions(ctx context.Context) []DefaultSubscriptionSetting {
 	value, err := s.settingRepo.GetValue(ctx, SettingKeyDefaultSubscriptions)
@@ -1590,6 +1603,7 @@ func (s *SettingService) InitializeDefaultSettings(ctx context.Context) error {
 		SettingKeyOIDCConnectUserInfoUsernamePath:          "",
 		SettingKeyDefaultConcurrency:                       strconv.Itoa(s.cfg.Default.UserConcurrency),
 		SettingKeyDefaultBalance:                           strconv.FormatFloat(s.cfg.Default.UserBalance, 'f', 8, 64),
+		SettingKeyDefaultUserRPMLimit:                      "0",
 		SettingKeyDefaultSubscriptions:                     "[]",
 		SettingKeyAuthSourceDefaultEmailBalance:            "0",
 		SettingKeyAuthSourceDefaultEmailConcurrency:        "5",
@@ -1699,6 +1713,10 @@ func (s *SettingService) parseSettings(settings map[string]string) *SystemSettin
 		result.DefaultConcurrency = s.cfg.Default.UserConcurrency
 	}
 
+	if rpm, err := strconv.Atoi(settings[SettingKeyDefaultUserRPMLimit]); err == nil && rpm >= 0 {
+		result.DefaultUserRPMLimit = rpm
+	}
+
 	// 解析浮点数类型
 	if balance, err := strconv.ParseFloat(settings[SettingKeyDefaultBalance], 64); err == nil {
 		result.DefaultBalance = balance

backend/internal/service/settings_view.go

@@ -106,6 +106,7 @@ type SystemSettings struct {
 
 	DefaultConcurrency   int
 	DefaultBalance       float64
+	DefaultUserRPMLimit  int
 	DefaultSubscriptions []DefaultSubscriptionSetting
 
 	// Model fallback configuration

backend/internal/service/user.go

@@ -49,6 +49,15 @@ type User struct {
 	BalanceNotifyExtraEmails   []NotifyEmailEntry
 	TotalRecharged             float64
 
+	// RPMLimit 用户级每分钟请求数上限（0 = 不限制）。仅在所用分组未设置 rpm_limit
+	// 且该 (用户, 分组) 无 rpm_override 时作为全局兜底生效，计数键 rpm:u:{userID}:{min}。
+	RPMLimit int
+
+	// UserGroupRPMOverride 来自 auth cache snapshot 的 (user, group) RPM 覆盖值。
+	// nil = 该 API Key 对应的 (user, group) 无 override；非 nil 时 checkRPM 直接使用，
+	// 避免每请求查 DB。字段不持久化到数据库。
+	UserGroupRPMOverride *int
+
 	APIKeys       []APIKey
 	Subscriptions []UserSubscription
 }

backend/internal/service/user_group_rate.go

@@ -2,14 +2,16 @@ package service
 
 import "context"
 
-// UserGroupRateEntry 分组下用户专属倍率条目
+// UserGroupRateEntry 分组下用户专属倍率/RPM 条目。
+// RateMultiplier 与 RPMOverride 均为指针以支持"未设置"语义（NULL）。
 type UserGroupRateEntry struct {
-	UserID         int64   `json:"user_id"`
-	UserName       string  `json:"user_name"`
-	UserEmail      string  `json:"user_email"`
-	UserNotes      string  `json:"user_notes"`
-	UserStatus     string  `json:"user_status"`
-	RateMultiplier float64 `json:"rate_multiplier"`
+	UserID         int64    `json:"user_id"`
+	UserName       string   `json:"user_name"`
+	UserEmail      string   `json:"user_email"`
+	UserNotes      string   `json:"user_notes"`
+	UserStatus     string   `json:"user_status"`
+	RateMultiplier *float64 `json:"rate_multiplier,omitempty"`
+	RPMOverride    *int     `json:"rpm_override,omitempty"`
 }
 
 // GroupRateMultiplierInput 批量设置分组倍率的输入条目
@@ -18,30 +20,44 @@ type GroupRateMultiplierInput struct {
 	RateMultiplier float64 `json:"rate_multiplier"`
 }
 
-// UserGroupRateRepository 用户专属分组倍率仓储接口
-// 允许管理员为特定用户设置分组的专属计费倍率，覆盖分组默认倍率
+// GroupRPMOverrideInput 批量设置分组 RPM override 的输入条目。
+// RPMOverride 为 *int 以支持清除（nil）语义。
+type GroupRPMOverrideInput struct {
+	UserID      int64 `json:"user_id"`
+	RPMOverride *int  `json:"rpm_override"`
+}
+
+// UserGroupRateRepository 用户专属分组倍率/RPM 仓储接口。
+// 允许管理员为特定用户设置分组的专属计费倍率与 RPM 上限，覆盖分组默认值。
 type UserGroupRateRepository interface {
-	// GetByUserID 获取用户的所有专属分组倍率
-	// 返回 map[groupID]rateMultiplier
+	// GetByUserID 获取用户所有专属分组 rate_multiplier（仅返回非 NULL 的条目）
 	GetByUserID(ctx context.Context, userID int64) (map[int64]float64, error)
 
-	// GetByUserAndGroup 获取用户在特定分组的专属倍率
-	// 如果未设置专属倍率，返回 nil
+	// GetByUserAndGroup 获取用户在特定分组的专属 rate_multiplier（NULL 返回 nil）
 	GetByUserAndGroup(ctx context.Context, userID, groupID int64) (*float64, error)
 
-	// GetByGroupID 获取指定分组下所有用户的专属倍率
+	// GetRPMOverrideByUserAndGroup 获取用户在特定分组的 rpm_override（NULL 返回 nil）
+	GetRPMOverrideByUserAndGroup(ctx context.Context, userID, groupID int64) (*int, error)
+
+	// GetByGroupID 获取指定分组下所有用户的专属配置（rate 与 rpm_override 任一非 NULL 即返回）
 	GetByGroupID(ctx context.Context, groupID int64) ([]UserGroupRateEntry, error)
 
-	// SyncUserGroupRates 同步用户的分组专属倍率
-	// rates: map[groupID]*rateMultiplier，nil 表示删除该分组的专属倍率
+	// SyncUserGroupRates 同步用户的分组专属倍率；nil 表示清空该分组的 rate_multiplier
 	SyncUserGroupRates(ctx context.Context, userID int64, rates map[int64]*float64) error
 
-	// SyncGroupRateMultipliers 批量同步分组的用户专属倍率（替换整组数据）
+	// SyncGroupRateMultipliers 批量同步分组的用户专属倍率（替换整组 rate 部分）
 	SyncGroupRateMultipliers(ctx context.Context, groupID int64, entries []GroupRateMultiplierInput) error
 
-	// DeleteByGroupID 删除指定分组的所有用户专属倍率（分组删除时调用）
+	// SyncGroupRPMOverrides 批量同步分组的用户专属 RPM（替换整组 rpm_override 部分）。
+	// 条目中 RPMOverride 为 nil 时清空对应行的 rpm_override；非 nil 时 upsert。
+	SyncGroupRPMOverrides(ctx context.Context, groupID int64, entries []GroupRPMOverrideInput) error
+
+	// ClearGroupRPMOverrides 清空指定分组的所有 rpm_override（整组 rpm 部分归 NULL）
+	ClearGroupRPMOverrides(ctx context.Context, groupID int64) error
+
+	// DeleteByGroupID 删除指定分组的所有用户专属条目（分组删除时调用）
 	DeleteByGroupID(ctx context.Context, groupID int64) error
 
-	// DeleteByUserID 删除指定用户的所有专属倍率（用户删除时调用）
+	// DeleteByUserID 删除指定用户的所有专属条目（用户删除时调用）
 	DeleteByUserID(ctx context.Context, userID int64) error
 }

backend/internal/service/user_rpm_cache.go

@@ -0,0 +1,25 @@
+package service
+
+import "context"
+
+// UserRPMCache 用户/分组级 RPM 计数器接口。
+//
+// 与账号级 RPMCache 的区别：
+//   - RPMCache    —— 按外部 AI provider 账号聚合（key: rpm:{accountID}:{min}）。
+//   - UserRPMCache —— 按用户或 (用户, 分组) 聚合，杜绝"同一用户创建多个 API Key 绕过 RPM"的路径。
+//     key 形如 rpm:ug:{userID}:{groupID}:{min} 或 rpm:u:{userID}:{min}。
+type UserRPMCache interface {
+	// IncrementUserGroupRPM 原子递增 (user, group) 级分钟计数并返回最新值。
+	// 用于分组 rpm_limit 与 user-group rpm_override 两种命中分支。
+	IncrementUserGroupRPM(ctx context.Context, userID, groupID int64) (count int, err error)
+
+	// IncrementUserRPM 原子递增用户级分钟计数并返回最新值。
+	// 用于用户全局 rpm_limit 兜底分支（分组未设且无 override 时）。
+	IncrementUserRPM(ctx context.Context, userID int64) (count int, err error)
+
+	// GetUserGroupRPM 获取 (user, group) 当前分钟已用 RPM（只读，不递增）。
+	GetUserGroupRPM(ctx context.Context, userID, groupID int64) (count int, err error)
+
+	// GetUserRPM 获取用户当前分钟已用 RPM（只读，不递增）。
+	GetUserRPM(ctx context.Context, userID int64) (count int, err error)
+}

backend/internal/service/wire.go

@@ -39,6 +39,11 @@ func ProvideEmailQueueService(emailService *EmailService) *EmailQueueService {
 	return NewEmailQueueService(emailService, 3)
 }
 
+// ProvideOAuthRefreshAPI creates OAuthRefreshAPI with the default lock TTL.
+func ProvideOAuthRefreshAPI(accountRepo AccountRepository, tokenCache GeminiTokenCache) *OAuthRefreshAPI {
+	return NewOAuthRefreshAPI(accountRepo, tokenCache)
+}
+
 // ProvideTokenRefreshService creates and starts TokenRefreshService
 func ProvideTokenRefreshService(
 	accountRepo AccountRepository,
@@ -383,6 +388,19 @@ func ProvideSettingService(settingRepo SettingRepository, groupRepo GroupReposit
 	return svc
 }
 
+// ProvideBillingCacheService wires BillingCacheService with its RPM dependencies.
+func ProvideBillingCacheService(
+	cache BillingCache,
+	userRepo UserRepository,
+	subRepo UserSubscriptionRepository,
+	apiKeyRepo APIKeyRepository,
+	rpmCache UserRPMCache,
+	rateRepo UserGroupRateRepository,
+	cfg *config.Config,
+) *BillingCacheService {
+	return NewBillingCacheService(cache, userRepo, subRepo, apiKeyRepo, rpmCache, rateRepo, cfg)
+}
+
 // ProviderSet is the Wire provider set for all services
 var ProviderSet = wire.NewSet(
 	// Core services
@@ -399,7 +417,7 @@ var ProviderSet = wire.NewSet(
 	NewDashboardService,
 	ProvidePricingService,
 	NewBillingService,
-	NewBillingCacheService,
+	ProvideBillingCacheService,
 	NewAnnouncementService,
 	NewAdminService,
 	NewGatewayService,
@@ -411,7 +429,7 @@ var ProviderSet = wire.NewSet(
 	NewCompositeTokenCacheInvalidator,
 	wire.Bind(new(TokenCacheInvalidator), new(*CompositeTokenCacheInvalidator)),
 	NewAntigravityOAuthService,
-	NewOAuthRefreshAPI,
+	ProvideOAuthRefreshAPI,
 	ProvideGeminiTokenProvider,
 	NewGeminiMessagesCompatService,
 	ProvideAntigravityTokenProvider,

backend/migrations/125_add_group_rpm_limit.sql

@@ -0,0 +1,7 @@
+-- Add per-group Requests-Per-Minute limit.
+-- rpm_limit: 分组统一 RPM 上限（0 = 不限制）。
+-- 一旦配置即接管该用户在该分组的限流，覆盖用户级 users.rpm_limit。
+-- 计数键：rpm:ug:{user_id}:{group_id}:{minute}。
+ALTER TABLE groups ADD COLUMN IF NOT EXISTS rpm_limit integer NOT NULL DEFAULT 0;
+
+COMMENT ON COLUMN groups.rpm_limit IS '分组 RPM 上限；0 表示不限制；设置后接管该分组用户的限流（覆盖用户级 rpm_limit）。';

backend/migrations/126_add_user_rpm_limit.sql

@@ -0,0 +1,7 @@
+-- Add per-user Requests-Per-Minute cap.
+-- rpm_limit: 用户全局 RPM 兜底（0 = 不限制）。
+-- 仅当所访问分组未设置 rpm_limit 且无 user-group rpm_override 时作为兜底生效。
+-- 计数键：rpm:u:{user_id}:{minute}。
+ALTER TABLE users ADD COLUMN IF NOT EXISTS rpm_limit integer NOT NULL DEFAULT 0;
+
+COMMENT ON COLUMN users.rpm_limit IS '用户级 RPM 兜底上限；0 表示不限制；仅当分组未设置 rpm_limit 时生效。';

backend/migrations/127_add_user_group_rpm_override.sql

@@ -0,0 +1,16 @@
+-- 在已有的"用户专属分组倍率表"上扩展 rpm_override 列；同时放宽 rate_multiplier 为可空，
+-- 使一行记录可以只覆盖 rate、只覆盖 rpm，或同时覆盖两者。
+-- 语义：
+--   - rate_multiplier NULL  → 该用户在此分组使用 groups.rate_multiplier 默认值
+--   - rate_multiplier 非 NULL → 覆盖分组默认计费倍率
+--   - rpm_override NULL     → 该用户在此分组使用 groups.rpm_limit 默认值
+--   - rpm_override 非 NULL  → 覆盖分组默认 RPM（0 = 不限制）
+-- 用户级 users.rpm_limit 仍独立生效（跨分组总配额）。
+ALTER TABLE user_group_rate_multipliers
+    ADD COLUMN IF NOT EXISTS rpm_override integer NULL;
+
+ALTER TABLE user_group_rate_multipliers
+    ALTER COLUMN rate_multiplier DROP NOT NULL;
+
+COMMENT ON COLUMN user_group_rate_multipliers.rate_multiplier IS '专属计费倍率；NULL 表示沿用分组默认倍率。';
+COMMENT ON COLUMN user_group_rate_multipliers.rpm_override IS '专属 RPM 上限；NULL 表示沿用分组默认；0 表示该用户在此分组不受 RPM 限制。';