diff --git a/backend/internal/server/api_contract_test.go b/backend/internal/server/api_contract_test.go
index c8463da39d..6a6396bc07 100644
--- a/backend/internal/server/api_contract_test.go
+++ b/backend/internal/server/api_contract_test.go
@@ -344,6 +344,10 @@ func TestAPIContracts(t *testing.T) {
 						"description": "desc",
 						"platform": "anthropic",
 						"rate_multiplier": 1.5,
+						"peak_rate_enabled": false,
+						"peak_start": "",
+						"peak_end": "",
+						"peak_rate_multiplier": 0,
 						"is_exclusive": false,
 						"status": "active",
 						"subscription_type": "standard",
diff --git a/backend/internal/service/group.go b/backend/internal/service/group.go
index f1e7fcb283..d116d1f83f 100644
--- a/backend/internal/service/group.go
+++ b/backend/internal/service/group.go
@@ -26,8 +26,8 @@ type Group struct {
 	PeakEnd            string
 	PeakRateMultiplier float64
 	IsExclusive        bool
-	Status         string
-	Hydrated       bool // indicates the group was loaded from a trusted repository source
+	Status             string
+	Hydrated           bool // indicates the group was loaded from a trusted repository source
 
 	SubscriptionType    string
 	DailyLimitUSD       *float64
@@ -190,6 +190,7 @@ func parseMinutes(hhmm string) (int, bool) {
 //   - 未启用 / 未配置 / 配置非法（start>=end 或格式错误） / 非高峰时段 → 返回 1.0（安全降级）
 //   - 区间为左闭右开 [PeakStart, PeakEnd)，仅支持当日区间，不支持跨天（如 22:00-次日02:00）
 //   - 时刻基于全局系统时区（timezone.Location）判定
+//
 // 该方法是纯函数，不读取任何外部状态，便于单测。
 func (g *Group) PeakMultiplierAt(now time.Time) float64 {
 	if g == nil || !g.IsSubscriptionType() || !g.PeakRateEnabled || g.PeakStart == "" || g.PeakEnd == "" {
diff --git a/backend/internal/service/openai_gateway_service.go b/backend/internal/service/openai_gateway_service.go
index 0f1a6efee2..6626292376 100644
--- a/backend/internal/service/openai_gateway_service.go
+++ b/backend/internal/service/openai_gateway_service.go
@@ -24,9 +24,9 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/pkg/apicompat"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/ip"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/logger"
-	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/openai_compat"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/timezone"
 	"github.com/Wei-Shaw/sub2api/internal/pkg/xai"
 	"github.com/Wei-Shaw/sub2api/internal/util/responseheaders"
 	"github.com/Wei-Shaw/sub2api/internal/util/urlvalidator"