diff --git a/backend/internal/handler/admin/account_handler.go b/backend/internal/handler/admin/account_handler.go
index f42159a8..358d71f6 100644
--- a/backend/internal/handler/admin/account_handler.go
+++ b/backend/internal/handler/admin/account_handler.go
@@ -288,48 +288,32 @@ func (h *AccountHandler) List(c *gin.Context) {
 		}
 	}
 
-	// 窗口费用获取：lite 模式从快照缓存读取，非 lite 模式执行 PostgreSQL 查询后写入缓存
+	// 始终获取窗口费用（PostgreSQL 聚合查询）
 	if len(windowCostAccountIDs) > 0 {
-		if lite {
-			// lite 模式：尝试从快照缓存读取
-			cacheKey := buildWindowCostCacheKey(windowCostAccountIDs)
-			if cached, ok := accountWindowCostCache.Get(cacheKey); ok {
-				if costs, ok := cached.Payload.(map[int64]float64); ok {
-					windowCosts = costs
-				}
-			}
-			// 缓存未命中则 windowCosts 保持 nil（仅发生在服务刚启动时）
-		} else {
-			// 非 lite 模式：执行 PostgreSQL 聚合查询（高开销）
-			windowCosts = make(map[int64]float64)
-			var mu sync.Mutex
-			g, gctx := errgroup.WithContext(c.Request.Context())
-			g.SetLimit(10) // 限制并发数
+		windowCosts = make(map[int64]float64)
+		var mu sync.Mutex
+		g, gctx := errgroup.WithContext(c.Request.Context())
+		g.SetLimit(10) // 限制并发数
 
-			for i := range accounts {
-				acc := &accounts[i]
-				if !acc.IsAnthropicOAuthOrSetupToken() || acc.GetWindowCostLimit() <= 0 {
-					continue
-				}
-				accCopy := acc // 闭包捕获
-				g.Go(func() error {
-					// 使用统一的窗口开始时间计算逻辑（考虑窗口过期情况）
-					startTime := accCopy.GetCurrentWindowStartTime()
-					stats, err := h.accountUsageService.GetAccountWindowStats(gctx, accCopy.ID, startTime)
-					if err == nil && stats != nil {
-						mu.Lock()
-						windowCosts[accCopy.ID] = stats.StandardCost // 使用标准费用
-						mu.Unlock()
-					}
-					return nil // 不返回错误，允许部分失败
-				})
+		for i := range accounts {
+			acc := &accounts[i]
+			if !acc.IsAnthropicOAuthOrSetupToken() || acc.GetWindowCostLimit() <= 0 {
+				continue
 			}
-			_ = g.Wait()
-
-			// 查询完毕后写入快照缓存，供 lite 模式使用
-			cacheKey := buildWindowCostCacheKey(windowCostAccountIDs)
-			accountWindowCostCache.Set(cacheKey, windowCosts)
+			accCopy := acc // 闭包捕获
+			g.Go(func() error {
+				// 使用统一的窗口开始时间计算逻辑（考虑窗口过期情况）
+				startTime := accCopy.GetCurrentWindowStartTime()
+				stats, err := h.accountUsageService.GetAccountWindowStats(gctx, accCopy.ID, startTime)
+				if err == nil && stats != nil {
+					mu.Lock()
+					windowCosts[accCopy.ID] = stats.StandardCost // 使用标准费用
+					mu.Unlock()
+				}
+				return nil // 不返回错误，允许部分失败
+			})
 		}
+		_ = g.Wait()
 	}
 
 	// Build response with concurrency info
diff --git a/backend/internal/handler/admin/account_window_cost_cache.go b/backend/internal/handler/admin/account_window_cost_cache.go
deleted file mode 100644
index 3271b630..00000000
--- a/backend/internal/handler/admin/account_window_cost_cache.go
+++ /dev/null
@@ -1,25 +0,0 @@
-package admin
-
-import (
-	"strconv"
-	"strings"
-	"time"
-)
-
-var accountWindowCostCache = newSnapshotCache(30 * time.Second)
-
-func buildWindowCostCacheKey(accountIDs []int64) string {
-	if len(accountIDs) == 0 {
-		return "accounts_window_cost_empty"
-	}
-	var b strings.Builder
-	b.Grow(len(accountIDs) * 6)
-	_, _ = b.WriteString("accounts_window_cost:")
-	for i, id := range accountIDs {
-		if i > 0 {
-			_ = b.WriteByte(',')
-		}
-		_, _ = b.WriteString(strconv.FormatInt(id, 10))
-	}
-	return b.String()
-}