perf: 全栈查询优化、前端缓存去重与页面可见性优化

后端:
- SQL count 查询统一改用 func.count() 子查询替代 query.count()
- Dashboard/Audit 等页面多次独立查询合并为单次聚合查询
- Provider summary 列表改为批量查询消除 N+1 问题
- DailyStats 逐天循环查询改为 CASE 分桶单次查询
- 使用 load_only() 减少不必要的列加载
- cache_decorator 支持嵌套属性路径解析(dotted vary_by)
- 多个管理/公共端点新增 @cache_result 缓存装饰

前端:
- cache.ts 新增 in-flight 请求复用、dedupedRequest、buildCacheKey
- 大量 API 调用添加前端缓存或去重
- 多个页面定时器在标签页隐藏时暂停、可见时恢复
- Auth 检查从 setInterval 改为 storage + visibilitychange 事件驱动
- 请求竞态防护(requestId 模式)

数据库:
- Usage 表新增 idx_usage_status_user_created 复合索引

src/api/admin/api_keys/routes.py

@@ -11,6 +11,7 @@ from typing import Any
 from zoneinfo import ZoneInfo
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request
+from sqlalchemy import func
 from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
@@ -366,7 +367,7 @@ class AdminListStandaloneKeysAdapter(AdminApiAdapter):
         if self.is_active is not None:
             query = query.filter(ApiKey.is_active == self.is_active)
 
-        total = query.count()
+        total = int(query.with_entities(func.count(ApiKey.id)).scalar() or 0)
         api_keys = (
             query.order_by(ApiKey.created_at.desc()).offset(self.skip).limit(self.limit).all()
         )

src/api/admin/billing/routes.py

@@ -13,6 +13,7 @@ from typing import Any, Literal
 
 from fastapi import APIRouter, Depends, Query, Request
 from pydantic import BaseModel, Field
+from sqlalchemy import func
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session
 
@@ -251,7 +252,7 @@ class BillingRuleListAdapter(AdminApiAdapter):
         if self.is_enabled is not None:
             q = q.filter(BillingRule.is_enabled == self.is_enabled)
 
-        total = q.count()
+        total = int(q.with_entities(func.count(BillingRule.id)).scalar() or 0)
         items = (
             q.order_by(BillingRule.updated_at.desc())
             .offset((self.page - 1) * self.page_size)
@@ -365,7 +366,7 @@ class DimensionCollectorListAdapter(AdminApiAdapter):
         if self.is_enabled is not None:
             q = q.filter(DimensionCollector.is_enabled == self.is_enabled)
 
-        total = q.count()
+        total = int(q.with_entities(func.count(DimensionCollector.id)).scalar() or 0)
         items = (
             q.order_by(DimensionCollector.updated_at.desc())
             .offset((self.page - 1) * self.page_size)

src/api/admin/gemini_files.py

@@ -21,7 +21,7 @@ from typing import Any
 from fastapi import APIRouter, Depends, File, HTTPException, Query, UploadFile
 from pydantic import BaseModel
 from sqlalchemy import delete, func
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, load_only
 
 from src.clients.http_client import HTTPClientPool
 from src.core.crypto import crypto_service
@@ -106,26 +106,45 @@ async def list_file_mappings(
     now = datetime.now(timezone.utc)
 
     query = db.query(GeminiFileMapping)
+    count_query = db.query(func.count(GeminiFileMapping.id))
 
     # 过滤过期
     if not include_expired:
-        query = query.filter(GeminiFileMapping.expires_at > now)
+        active_filter = GeminiFileMapping.expires_at > now
+        query = query.filter(active_filter)
+        count_query = count_query.filter(active_filter)
 
     # 搜索
     if search:
         search_pattern = f"%{search}%"
-        query = query.filter(
-            (GeminiFileMapping.file_name.ilike(search_pattern))
-            | (GeminiFileMapping.display_name.ilike(search_pattern))
+        search_filter = (GeminiFileMapping.file_name.ilike(search_pattern)) | (
+            GeminiFileMapping.display_name.ilike(search_pattern)
         )
+        query = query.filter(search_filter)
+        count_query = count_query.filter(search_filter)
 
     # 总数
-    total = query.count()
+    total = int(count_query.scalar() or 0)
 
     # 分页
     offset = (page - 1) * page_size
     mappings = (
-        query.order_by(GeminiFileMapping.created_at.desc()).offset(offset).limit(page_size).all()
+        query.options(
+            load_only(
+                GeminiFileMapping.id,
+                GeminiFileMapping.file_name,
+                GeminiFileMapping.key_id,
+                GeminiFileMapping.user_id,
+                GeminiFileMapping.display_name,
+                GeminiFileMapping.mime_type,
+                GeminiFileMapping.created_at,
+                GeminiFileMapping.expires_at,
+            )
+        )
+        .order_by(GeminiFileMapping.created_at.desc())
+        .offset(offset)
+        .limit(page_size)
+        .all()
     )
 
     # 获取关联的 Key 和 User 信息
@@ -134,12 +153,22 @@ async def list_file_mappings(
 
     keys_map = {}
     if key_ids:
-        keys = db.query(ProviderAPIKey).filter(ProviderAPIKey.id.in_(key_ids)).all()
+        keys = (
+            db.query(ProviderAPIKey)
+            .options(load_only(ProviderAPIKey.id, ProviderAPIKey.name))
+            .filter(ProviderAPIKey.id.in_(key_ids))
+            .all()
+        )
         keys_map = {str(k.id): k.name for k in keys}
 
     users_map = {}
     if user_ids:
-        users = db.query(User).filter(User.id.in_(user_ids)).all()
+        users = (
+            db.query(User)
+            .options(load_only(User.id, User.username))
+            .filter(User.id.in_(user_ids))
+            .all()
+        )
         users_map = {str(u.id): u.username for u in users}
 
     items = []
@@ -199,9 +228,11 @@ async def get_file_mapping_stats(
     by_mime_type = {(mt or "unknown"): count for mt, count in mime_stats}
 
     # 有 gemini_files 能力的 Key 数量
-    keys = db.query(ProviderAPIKey).filter(ProviderAPIKey.is_active.is_(True)).all()
+    keys = db.query(ProviderAPIKey.capabilities).filter(ProviderAPIKey.is_active.is_(True)).all()
     capable_keys_count = sum(
-        1 for key in keys if key.capabilities and key.capabilities.get("gemini_files", False)
+        1
+        for (capabilities,) in keys
+        if isinstance(capabilities, dict) and capabilities.get("gemini_files", False)
     )
 
     return FileMappingStatsResponse(
@@ -294,15 +325,28 @@ async def list_capable_keys(
     """获取所有具有 gemini_files 能力的 Key 列表"""
     from src.models.database import Provider
 
-    keys = db.query(ProviderAPIKey).filter(ProviderAPIKey.is_active.is_(True)).all()
+    key_rows = (
+        db.query(
+            ProviderAPIKey.id,
+            ProviderAPIKey.name,
+            ProviderAPIKey.provider_id,
+            ProviderAPIKey.capabilities,
+        )
+        .filter(ProviderAPIKey.is_active.is_(True))
+        .all()
+    )
     capable_keys = [
-        key for key in keys if key.capabilities and key.capabilities.get("gemini_files", False)
+        key
+        for key in key_rows
+        if isinstance(key.capabilities, dict) and key.capabilities.get("gemini_files", False)
     ]
 
     # 获取 Provider 名称
-    provider_ids = {key.provider_id for key in capable_keys}
-    providers = db.query(Provider).filter(Provider.id.in_(provider_ids)).all()
-    provider_map = {str(p.id): p.name for p in providers}
+    provider_ids = {key.provider_id for key in capable_keys if key.provider_id}
+    provider_map: dict[str, str] = {}
+    if provider_ids:
+        providers = db.query(Provider.id, Provider.name).filter(Provider.id.in_(provider_ids)).all()
+        provider_map = {str(provider_id): provider_name for provider_id, provider_name in providers}
 
     return [
         CapableKeyResponse(
@@ -454,6 +498,15 @@ async def upload_file(
     with create_session() as db:
         keys = (
             db.query(ProviderAPIKey)
+            .options(
+                load_only(
+                    ProviderAPIKey.id,
+                    ProviderAPIKey.name,
+                    ProviderAPIKey.api_key,
+                    ProviderAPIKey.capabilities,
+                    ProviderAPIKey.is_active,
+                )
+            )
             .filter(
                 ProviderAPIKey.id.in_(key_id_list),
                 ProviderAPIKey.is_active.is_(True),
@@ -483,6 +536,7 @@ async def upload_file(
             now = datetime.now(timezone.utc)
             existing = (
                 db.query(GeminiFileMapping)
+                .options(load_only(GeminiFileMapping.key_id, GeminiFileMapping.file_name))
                 .filter(
                     GeminiFileMapping.source_hash == source_hash,
                     GeminiFileMapping.key_id.in_(capable_key_ids),

src/api/admin/management_tokens/routes.py

@@ -7,6 +7,7 @@ from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request
 from fastapi.responses import JSONResponse
+from sqlalchemy import func
 from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
@@ -190,7 +191,7 @@ class AdminListManagementTokensAdapter(AdminManagementTokenApiAdapter):
         if self.is_active is not None:
             query = query.filter(ManagementToken.is_active == self.is_active)
 
-        total = query.count()
+        total = int(query.with_entities(func.count(ManagementToken.id)).scalar() or 0)
         tokens = (
             query.order_by(ManagementToken.created_at.desc())
             .offset(self.skip)

src/api/admin/models/global_models.py

@@ -276,17 +276,24 @@ class AdminListGlobalModelsAdapter(AdminApiAdapter):
     search: str | None
 
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
-        from sqlalchemy import and_, case, func
+        from sqlalchemy import and_, case, func, or_
 
-        from src.models.database import Model, Provider
+        from src.models.database import GlobalModel, Model, Provider
 
-        models = GlobalModelService.list_global_models(
-            db=context.db,
-            skip=self.skip,
-            limit=self.limit,
-            is_active=self.is_active,
-            search=self.search,
-        )
+        query = context.db.query(GlobalModel)
+        if self.is_active is not None:
+            query = query.filter(GlobalModel.is_active == self.is_active)
+        if self.search:
+            search_pattern = f"%{self.search}%"
+            query = query.filter(
+                or_(
+                    GlobalModel.name.ilike(search_pattern),
+                    GlobalModel.display_name.ilike(search_pattern),
+                )
+            )
+
+        total = int(query.with_entities(func.count(GlobalModel.id)).scalar() or 0)
+        models = query.order_by(GlobalModel.name).offset(self.skip).limit(self.limit).all()
 
         # 一次性查询所有 GlobalModel 的 provider_count（优化 N+1 问题）
         # 用条件聚合同时获取总数和活跃数，减少一次 DB 往返
@@ -331,7 +338,7 @@ class AdminListGlobalModelsAdapter(AdminApiAdapter):
 
         return GlobalModelListResponse(
             models=model_responses,
-            total=len(models),
+            total=total,
         )
 
 
@@ -349,10 +356,9 @@ class AdminGetGlobalModelAdapter(AdminApiAdapter):
         global_model = GlobalModelService.get_global_model(context.db, self.global_model_id)
         stats = GlobalModelService.get_global_model_stats(context.db, self.global_model_id)
 
-        # 查询 provider_count 和 active_provider_count（与列表 API 一致）
-        count_row = (
+        # total_providers 已由 stats 提供，这里只查询活跃 provider 数量
+        active_count = (
             context.db.query(
-                func.count(func.distinct(Model.provider_id)),
                 func.count(
                     func.distinct(
                         case(
@@ -366,17 +372,17 @@ class AdminGetGlobalModelAdapter(AdminApiAdapter):
                             else_=None,
                         )
                     )
-                ),
+                )
             )
             .join(Provider, Model.provider_id == Provider.id)
             .filter(Model.global_model_id == global_model.id)
-            .first()
+            .scalar()
+            or 0
         )
-        total_count, active_count = count_row if count_row else (0, 0)
 
         response = GlobalModelResponse.model_validate(global_model)
-        response.provider_count = total_count
-        response.active_provider_count = active_count
+        response.provider_count = stats["total_providers"]
+        response.active_provider_count = int(active_count)
 
         return GlobalModelWithStats(
             **response.model_dump(),

src/api/admin/monitoring/audit.py

@@ -7,13 +7,14 @@ from datetime import datetime, timedelta, timezone
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request
-from sqlalchemy import func
+from sqlalchemy import case, func
 from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
-from src.api.base.pagination import PaginationMeta, build_pagination_payload, paginate_query
+from src.api.base.pagination import PaginationMeta, build_pagination_payload
 from src.api.base.pipeline import ApiRequestPipeline
+from src.config.constants import CacheTTL
 from src.core.logger import logger
 from src.database import get_db
 from src.models.database import (
@@ -26,6 +27,7 @@ from src.models.database import (
 from src.models.database import User as DBUser
 from src.services.health.monitor import HealthMonitor
 from src.services.system.audit import audit_service
+from src.utils.cache_decorator import cache_result
 from src.utils.database_helpers import escape_like_pattern
 
 router = APIRouter(prefix="/api/admin/monitoring", tags=["Admin - Monitoring"])
@@ -223,10 +225,26 @@ class AdminGetAuditLogsAdapter(AdminApiAdapter):
     # 查看审计日志本身不应该产生审计记录，避免刷新页面时产生大量无意义的日志
     audit_log_enabled: bool = False
 
+    @cache_result(
+        key_prefix="admin:monitoring:audit-logs",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+        vary_by=["username", "event_type", "days", "limit", "offset"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
         cutoff_time = datetime.now(timezone.utc) - timedelta(days=self.days)
 
+        count_query = db.query(func.count(AuditLog.id)).filter(AuditLog.created_at >= cutoff_time)
+        if self.username:
+            escaped = escape_like_pattern(self.username)
+            count_query = count_query.outerjoin(DBUser, AuditLog.user_id == DBUser.id).filter(
+                DBUser.username.ilike(f"%{escaped}%", escape="\\")
+            )
+        if self.event_type:
+            count_query = count_query.filter(AuditLog.event_type == self.event_type)
+        total = int(count_query.scalar() or 0)
+
         base_query = (
             db.query(AuditLog, DBUser)
             .outerjoin(DBUser, AuditLog.user_id == DBUser.id)
@@ -238,8 +256,12 @@ class AdminGetAuditLogsAdapter(AdminApiAdapter):
         if self.event_type:
             base_query = base_query.filter(AuditLog.event_type == self.event_type)
 
-        ordered_query = base_query.order_by(AuditLog.created_at.desc())
-        total, logs_with_users = paginate_query(ordered_query, self.limit, self.offset)
+        logs_with_users = (
+            base_query.order_by(AuditLog.created_at.desc())
+            .offset(self.offset)
+            .limit(self.limit)
+            .all()
+        )
 
         items = [
             {
@@ -287,39 +309,51 @@ class AdminGetAuditLogsAdapter(AdminApiAdapter):
 
 
 class AdminSystemStatusAdapter(AdminApiAdapter):
+    @cache_result(
+        key_prefix="admin:monitoring:system-status",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
 
-        total_users = db.query(func.count(DBUser.id)).scalar()
-        active_users = db.query(func.count(DBUser.id)).filter(DBUser.is_active.is_(True)).scalar()
+        user_stats = db.query(
+            func.count(DBUser.id).label("total"),
+            func.sum(case((DBUser.is_active.is_(True), 1), else_=0)).label("active"),
+        ).first()
+        total_users = int((user_stats.total if user_stats else 0) or 0)
+        active_users = int((user_stats.active if user_stats else 0) or 0)
 
-        total_providers = db.query(func.count(Provider.id)).scalar()
-        active_providers = (
-            db.query(func.count(Provider.id)).filter(Provider.is_active.is_(True)).scalar()
-        )
+        provider_stats = db.query(
+            func.count(Provider.id).label("total"),
+            func.sum(case((Provider.is_active.is_(True), 1), else_=0)).label("active"),
+        ).first()
+        total_providers = int((provider_stats.total if provider_stats else 0) or 0)
+        active_providers = int((provider_stats.active if provider_stats else 0) or 0)
 
-        total_api_keys = db.query(func.count(ApiKey.id)).scalar()
-        active_api_keys = (
-            db.query(func.count(ApiKey.id)).filter(ApiKey.is_active.is_(True)).scalar()
-        )
+        api_key_stats = db.query(
+            func.count(ApiKey.id).label("total"),
+            func.sum(case((ApiKey.is_active.is_(True), 1), else_=0)).label("active"),
+        ).first()
+        total_api_keys = int((api_key_stats.total if api_key_stats else 0) or 0)
+        active_api_keys = int((api_key_stats.active if api_key_stats else 0) or 0)
 
         today_start = datetime.now(timezone.utc).replace(hour=0, minute=0, second=0, microsecond=0)
-        today_requests = (
-            db.query(func.count(Usage.id)).filter(Usage.created_at >= today_start).scalar()
-        )
-        today_tokens = (
-            db.query(func.sum(Usage.total_tokens)).filter(Usage.created_at >= today_start).scalar()
-            or 0
-        )
-        today_cost = (
-            db.query(func.sum(Usage.total_cost_usd))
+        today_stats = (
+            db.query(
+                func.count(Usage.id).label("requests"),
+                func.coalesce(func.sum(Usage.total_tokens), 0).label("tokens"),
+                func.coalesce(func.sum(Usage.total_cost_usd), 0.0).label("cost"),
+            )
             .filter(Usage.created_at >= today_start)
-            .scalar()
-            or 0
+            .first()
         )
+        today_requests = int((today_stats.requests if today_stats else 0) or 0)
+        today_tokens = int((today_stats.tokens if today_stats else 0) or 0)
+        today_cost = float((today_stats.cost if today_stats else 0.0) or 0.0)
 
         recent_errors = (
-            db.query(AuditLog)
+            db.query(func.count(AuditLog.id))
             .filter(
                 AuditLog.event_type.in_(
                     [
@@ -329,20 +363,21 @@ class AdminSystemStatusAdapter(AdminApiAdapter):
                 ),
                 AuditLog.created_at >= datetime.now(timezone.utc) - timedelta(hours=1),
             )
-            .count()
+            .scalar()
+            or 0
         )
 
         context.add_audit_metadata(
             action="system_status_snapshot",
-            total_users=int(total_users or 0),
-            active_users=int(active_users or 0),
-            total_providers=int(total_providers or 0),
-            active_providers=int(active_providers or 0),
-            total_api_keys=int(total_api_keys or 0),
-            active_api_keys=int(active_api_keys or 0),
-            today_requests=int(today_requests or 0),
-            today_tokens=int(today_tokens or 0),
-            today_cost=float(today_cost or 0.0),
+            total_users=total_users,
+            active_users=active_users,
+            total_providers=total_providers,
+            active_providers=active_providers,
+            total_api_keys=total_api_keys,
+            active_api_keys=active_api_keys,
+            today_requests=today_requests,
+            today_tokens=today_tokens,
+            today_cost=today_cost,
             recent_errors=int(recent_errors or 0),
         )
 

src/api/admin/pool/routes.py

@@ -617,13 +617,68 @@ class AdminPoolOverviewAdapter(AdminApiAdapter):
             .all()
         )
 
+        # 先批量计算池化 Provider 的 Key 总数/启用数，避免每个 Provider 单独查询（N+1）。
+        pool_provider_ids: list[str] = []
+        pool_enabled_map: dict[str, bool] = {}
+        for p in providers:
+            pid = str(p.id)
+            enabled = parse_pool_config(getattr(p, "config", None)) is not None
+            pool_enabled_map[pid] = enabled
+            if enabled:
+                pool_provider_ids.append(pid)
+
+        key_ids_by_provider: dict[str, list[str]] = {pid: [] for pid in pool_provider_ids}
+        key_stats_by_provider: dict[str, dict[str, int]] = {
+            pid: {"total": 0, "active": 0} for pid in pool_provider_ids
+        }
+        if pool_provider_ids:
+            key_rows = (
+                db.query(
+                    ProviderAPIKey.provider_id,
+                    ProviderAPIKey.id,
+                    ProviderAPIKey.is_active,
+                )
+                .filter(ProviderAPIKey.provider_id.in_(pool_provider_ids))
+                .all()
+            )
+            for provider_id, key_id, is_active in key_rows:
+                pid = str(provider_id)
+                kid = str(key_id)
+                key_ids_by_provider.setdefault(pid, []).append(kid)
+                stats = key_stats_by_provider.setdefault(pid, {"total": 0, "active": 0})
+                stats["total"] += 1
+                if is_active:
+                    stats["active"] += 1
+
+        # Redis 冷却状态并发获取，避免逐 Provider 串行等待。
+        cooldown_count_by_provider: dict[str, int] = {}
+        cooldown_targets = [
+            (pid, key_ids) for pid, key_ids in key_ids_by_provider.items() if key_ids
+        ]
+        if cooldown_targets:
+            cooldown_results = await asyncio.gather(
+                *[
+                    pool_redis.batch_get_cooldowns(pid, key_ids)
+                    for pid, key_ids in cooldown_targets
+                ],
+                return_exceptions=True,
+            )
+            for (pid, _key_ids), result in zip(cooldown_targets, cooldown_results, strict=False):
+                if isinstance(result, Exception):
+                    logger.warning(
+                        "池管理概览读取冷却状态失败",
+                        extra={"provider_id": pid, "error": str(result)},
+                    )
+                    cooldown_count_by_provider[pid] = 0
+                else:
+                    cooldown_count_by_provider[pid] = sum(
+                        1 for value in result.values() if value is not None
+                    )
+
         items: list[PoolOverviewItem] = []
         for p in providers:
             pid = str(p.id)
-            pcfg = parse_pool_config(getattr(p, "config", None))
-
-            # Non-pool providers: skip Redis + key queries entirely.
-            if pcfg is None:
+            if not pool_enabled_map.get(pid, False):
                 items.append(
                     PoolOverviewItem(
                         provider_id=pid,
@@ -634,22 +689,16 @@ class AdminPoolOverviewAdapter(AdminApiAdapter):
                 )
                 continue
 
-            keys = db.query(ProviderAPIKey).filter(ProviderAPIKey.provider_id == pid).all()
-            key_ids = [str(k.id) for k in keys]
-
-            cooldown_count = 0
-            if key_ids:
-                cooldowns = await pool_redis.batch_get_cooldowns(pid, key_ids)
-                cooldown_count = sum(1 for v in cooldowns.values() if v is not None)
+            key_stats = key_stats_by_provider.get(pid, {"total": 0, "active": 0})
 
             items.append(
                 PoolOverviewItem(
                     provider_id=pid,
                     provider_name=p.name,
                     provider_type=str(getattr(p, "provider_type", "custom") or "custom"),
-                    total_keys=len(keys),
-                    active_keys=sum(1 for k in keys if k.is_active),
-                    cooldown_count=cooldown_count,
+                    total_keys=key_stats["total"],
+                    active_keys=key_stats["active"],
+                    cooldown_count=cooldown_count_by_provider.get(pid, 0),
                     pool_enabled=True,
                 )
             )
@@ -688,7 +737,7 @@ class AdminListPoolKeysAdapter(AdminApiAdapter):
             q = q.filter(ProviderAPIKey.is_active.is_(False))
         # "cooldown" filtering is done post-query (Redis state)
 
-        total = q.count()
+        total = 0
 
         # For cooldown filtering we need to fetch all, then filter, then paginate.
         # Limit scan range to avoid loading the entire table into memory.
@@ -702,6 +751,7 @@ class AdminListPoolKeysAdapter(AdminApiAdapter):
             offset = (self.page - 1) * self.page_size
             keys = all_keys[offset : offset + self.page_size]
         else:
+            total = int(q.with_entities(func.count(ProviderAPIKey.id)).scalar() or 0)
             offset = (self.page - 1) * self.page_size
             keys = (
                 q.order_by(ProviderAPIKey.created_at.desc())

src/api/admin/providers/routes.py

@@ -9,12 +9,14 @@ from typing import Any
 
 from fastapi import APIRouter, Depends, Query, Request
 from pydantic import BaseModel, ConfigDict, Field, ValidationError
-from sqlalchemy.orm import Session
+from sqlalchemy import func
+from sqlalchemy.orm import Session, load_only
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
 from src.api.base.models_service import invalidate_models_list_cache
 from src.api.base.pipeline import ApiRequestPipeline
+from src.config.constants import CacheTTL
 from src.core.enums import ProviderBillingType
 from src.core.exceptions import InvalidRequestException, NotFoundException
 from src.core.logger import logger
@@ -27,6 +29,7 @@ from src.models.database import GlobalModel, Provider, ProviderAPIKey, ProviderE
 from src.models.endpoint_models import ProviderWithEndpointsSummary
 from src.services.cache.model_cache import ModelCacheService
 from src.services.cache.provider_cache import ProviderCacheService
+from src.utils.cache_decorator import cache_result
 
 from .summary import _build_provider_summary
 
@@ -341,9 +344,24 @@ class AdminListProvidersAdapter(AdminApiAdapter):
         self.limit = limit
         self.is_active = is_active
 
+    @cache_result(
+        key_prefix="admin:providers:list",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+        vary_by=["skip", "limit", "is_active"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
-        query = db.query(Provider)
+        query = db.query(Provider).options(
+            load_only(
+                Provider.id,
+                Provider.name,
+                Provider.provider_priority,
+                Provider.is_active,
+                Provider.created_at,
+                Provider.updated_at,
+            )
+        )
         if self.is_active is not None:
             query = query.filter(Provider.is_active == self.is_active)
         providers = query.offset(self.skip).limit(self.limit).all()
@@ -723,11 +741,22 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
     def __init__(self, provider_id: str):
         self.provider_id = provider_id
 
-    async def handle(self, context: ApiRequestContext) -> ProviderMappingPreviewResponse:  # type: ignore[override]
+    @cache_result(
+        key_prefix="admin:providers:mapping-preview",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+        vary_by=["provider_id"],
+    )
+    async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
 
         # 获取 Provider
-        provider = db.query(Provider).filter(Provider.id == self.provider_id).first()
+        provider = (
+            db.query(Provider)
+            .options(load_only(Provider.id, Provider.name))
+            .filter(Provider.id == self.provider_id)
+            .first()
+        )
         if not provider:
             raise NotFoundException("提供商不存在", "provider")
 
@@ -735,19 +764,6 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
         truncated_keys = 0
         truncated_models = 0
 
-        # 获取该 Provider 有白名单配置的 Key 总数（用于截断统计）
-        from sqlalchemy import func
-
-        total_keys_with_allowed_models = (
-            db.query(func.count(ProviderAPIKey.id))
-            .filter(
-                ProviderAPIKey.provider_id == self.provider_id,
-                ProviderAPIKey.allowed_models.isnot(None),
-            )
-            .scalar()
-            or 0
-        )
-
         # 获取该 Provider 有白名单配置的 Key（只查询需要的字段）
         keys = (
             db.query(
@@ -761,25 +777,22 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
                 ProviderAPIKey.provider_id == self.provider_id,
                 ProviderAPIKey.allowed_models.isnot(None),
             )
-            .limit(MAPPING_PREVIEW_MAX_KEYS)
+            .limit(MAPPING_PREVIEW_MAX_KEYS + 1)
             .all()
         )
 
-        # 计算被截断的 Key 数量
-        if total_keys_with_allowed_models > MAPPING_PREVIEW_MAX_KEYS:
-            truncated_keys = total_keys_with_allowed_models - MAPPING_PREVIEW_MAX_KEYS
-
-        # 获取有 model_mappings 配置的 GlobalModel 总数（用于截断统计）
-        total_models_with_mappings = (
-            db.query(func.count(GlobalModel.id))
-            .filter(
-                GlobalModel.config.isnot(None),
-                GlobalModel.config["model_mappings"].isnot(None),
-                func.jsonb_array_length(GlobalModel.config["model_mappings"]) > 0,
+        if len(keys) > MAPPING_PREVIEW_MAX_KEYS:
+            keys = keys[:MAPPING_PREVIEW_MAX_KEYS]
+            total_keys_with_allowed_models = (
+                db.query(func.count(ProviderAPIKey.id))
+                .filter(
+                    ProviderAPIKey.provider_id == self.provider_id,
+                    ProviderAPIKey.allowed_models.isnot(None),
+                )
+                .scalar()
+                or 0
             )
-            .scalar()
-            or 0
-        )
+            truncated_keys = total_keys_with_allowed_models - MAPPING_PREVIEW_MAX_KEYS
 
         # 只查询有 model_mappings 配置的 GlobalModel（使用 SQLAlchemy JSONB 操作符）
         global_models = (
@@ -795,12 +808,22 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
                 GlobalModel.config["model_mappings"].isnot(None),
                 func.jsonb_array_length(GlobalModel.config["model_mappings"]) > 0,
             )
-            .limit(MAPPING_PREVIEW_MAX_MODELS)
+            .limit(MAPPING_PREVIEW_MAX_MODELS + 1)
             .all()
         )
 
-        # 计算被截断的 GlobalModel 数量
-        if total_models_with_mappings > MAPPING_PREVIEW_MAX_MODELS:
+        if len(global_models) > MAPPING_PREVIEW_MAX_MODELS:
+            global_models = global_models[:MAPPING_PREVIEW_MAX_MODELS]
+            total_models_with_mappings = (
+                db.query(func.count(GlobalModel.id))
+                .filter(
+                    GlobalModel.config.isnot(None),
+                    GlobalModel.config["model_mappings"].isnot(None),
+                    func.jsonb_array_length(GlobalModel.config["model_mappings"]) > 0,
+                )
+                .scalar()
+                or 0
+            )
             truncated_models = total_models_with_mappings - MAPPING_PREVIEW_MAX_MODELS
 
         # 构建有映射配置的 GlobalModel 映射
@@ -819,10 +842,10 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
                 keys=[],
                 total_keys=0,
                 total_matches=0,
-                truncated=False,
-                truncated_keys=0,
-                truncated_models=0,
-            )
+                truncated=truncated_keys > 0 or truncated_models > 0,
+                truncated_keys=truncated_keys,
+                truncated_models=truncated_models,
+            ).model_dump()
 
         key_infos: list[MappingMatchingKey] = []
         total_matches = 0
@@ -837,18 +860,6 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
             if not allowed_models_list:
                 continue
 
-            # 生成脱敏 Key
-            masked_key = "***"
-            if key.api_key:
-                try:
-                    decrypted_key = crypto.decrypt(key.api_key, silent=True)
-                    if len(decrypted_key) > 8:
-                        masked_key = f"{decrypted_key[:4]}***{decrypted_key[-4:]}"
-                    else:
-                        masked_key = f"{decrypted_key[:2]}***"
-                except Exception:
-                    pass
-
             # 查找匹配的 GlobalModel
             matching_global_models: list[MappingMatchingGlobalModel] = []
 
@@ -879,6 +890,18 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
                     total_matches += 1
 
             if matching_global_models:
+                # 只有有匹配结果的 key 才做解密脱敏，减少 CPU 开销
+                masked_key = "***"
+                if key.api_key:
+                    try:
+                        decrypted_key = crypto.decrypt(key.api_key, silent=True)
+                        if len(decrypted_key) > 8:
+                            masked_key = f"{decrypted_key[:4]}***{decrypted_key[-4:]}"
+                        else:
+                            masked_key = f"{decrypted_key[:2]}***"
+                    except Exception:
+                        pass
+
                 key_infos.append(
                     MappingMatchingKey(
                         key_id=key.id or "",
@@ -901,7 +924,7 @@ class AdminGetProviderMappingPreviewAdapter(AdminApiAdapter):
             truncated=is_truncated,
             truncated_keys=truncated_keys,
             truncated_models=truncated_models,
-        )
+        ).model_dump()
 
 
 # ========== Claude Code Pool Management ==========

src/api/admin/providers/summary.py

@@ -8,12 +8,13 @@ from typing import Any
 
 from fastapi import APIRouter, Depends, Query, Request
 from sqlalchemy import case, func
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, load_only
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
 from src.api.base.models_service import invalidate_models_list_cache
 from src.api.base.pipeline import ApiRequestPipeline
+from src.config.constants import CacheTTL
 from src.core.enums import ProviderBillingType
 from src.core.exceptions import InvalidRequestException, NotFoundException
 from src.core.logger import logger
@@ -39,6 +40,7 @@ from src.models.endpoint_models import (
 )
 from src.services.cache.model_cache import ModelCacheService
 from src.services.cache.provider_cache import ProviderCacheService
+from src.utils.cache_decorator import cache_result
 
 router = APIRouter(tags=["Provider Summary"])
 pipeline = ApiRequestPipeline()
@@ -130,11 +132,8 @@ async def get_provider_summary(
     - `created_at`: 创建时间
     - `updated_at`: 更新时间
     """
-    provider = db.query(Provider).filter(Provider.id == provider_id).first()
-    if not provider:
-        raise NotFoundException(f"Provider {provider_id} not found")
-
-    return _build_provider_summary(db, provider)
+    adapter = AdminProviderDetailAdapter(provider_id=provider_id)
+    return await pipeline.run(adapter=adapter, http_request=request, db=db, mode=adapter.mode)
 
 
 @router.get("/{provider_id}/health-monitor", response_model=ProviderEndpointHealthMonitorResponse)
@@ -319,12 +318,20 @@ def _extract_failover_rules_from_config(
 
 
 def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndpointsSummary:
-    endpoints = db.query(ProviderEndpoint).filter(ProviderEndpoint.provider_id == provider.id).all()
+    endpoints = (
+        db.query(ProviderEndpoint)
+        .options(
+            load_only(
+                ProviderEndpoint.id,
+                ProviderEndpoint.provider_id,
+                ProviderEndpoint.api_format,
+                ProviderEndpoint.is_active,
+            )
+        )
+        .filter(ProviderEndpoint.provider_id == provider.id)
+        .all()
+    )
 
-    total_endpoints = len(endpoints)
-    active_endpoints = sum(1 for e in endpoints if e.is_active)
-
-    # Key 统计（合并为单个查询）
     key_stats = (
         db.query(
             func.count(ProviderAPIKey.id).label("total"),
@@ -333,10 +340,9 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
         .filter(ProviderAPIKey.provider_id == provider.id)
         .first()
     )
-    total_keys = key_stats.total or 0
+    total_keys = int(key_stats.total or 0)
     active_keys = int(key_stats.active or 0)
 
-    # Model 统计（合并为单个查询）
     model_stats = (
         db.query(
             func.count(Model.id).label("total"),
@@ -345,25 +351,62 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
         .filter(Model.provider_id == provider.id)
         .first()
     )
-    total_models = model_stats.total or 0
+    total_models = int(model_stats.total or 0)
     active_models = int(model_stats.active or 0)
 
-    # 活跃模型关联的全局模型 ID 列表
     global_model_ids = [
         row[0]
         for row in db.query(Model.global_model_id)
         .filter(
             Model.provider_id == provider.id,
             Model.is_active == True,
+            Model.global_model_id.isnot(None),
         )
         .distinct()
         .all()
     ]
 
-    api_formats = [e.api_format for e in endpoints]
+    all_keys = (
+        db.query(ProviderAPIKey)
+        .options(
+            load_only(
+                ProviderAPIKey.id,
+                ProviderAPIKey.provider_id,
+                ProviderAPIKey.is_active,
+                ProviderAPIKey.api_formats,
+                ProviderAPIKey.health_by_format,
+            )
+        )
+        .filter(ProviderAPIKey.provider_id == provider.id)
+        .all()
+    )
 
-    # 优化: 一次性加载 Provider 的 keys，避免 N+1 查询
-    all_keys = db.query(ProviderAPIKey).filter(ProviderAPIKey.provider_id == provider.id).all()
+    return _compose_provider_summary(
+        provider=provider,
+        endpoints=endpoints,
+        all_keys=all_keys,
+        total_keys=total_keys,
+        active_keys=active_keys,
+        total_models=total_models,
+        active_models=active_models,
+        global_model_ids=global_model_ids,
+    )
+
+
+def _compose_provider_summary(
+    *,
+    provider: Provider,
+    endpoints: list[ProviderEndpoint],
+    all_keys: list[ProviderAPIKey],
+    total_keys: int,
+    active_keys: int,
+    total_models: int,
+    active_models: int,
+    global_model_ids: list[Any],
+) -> ProviderWithEndpointsSummary:
+    total_endpoints = len(endpoints)
+    active_endpoints = sum(1 for e in endpoints if e.is_active)
+    api_formats = [e.api_format for e in endpoints]
 
     # 按 api_formats 分组 keys（通过 api_formats 关联）
     format_to_endpoint_id: dict[str, str] = {e.api_format: e.id for e in endpoints}
@@ -379,9 +422,8 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
     for endpoint in endpoints:
         keys = keys_by_endpoint.get(endpoint.id, [])
         if keys:
-            # 从 health_by_format 获取对应格式的健康度
             api_fmt = endpoint.api_format
-            health_scores = []
+            health_scores: list[float] = []
             for k in keys:
                 health_by_format = k.health_by_format or {}
                 if api_fmt in health_by_format:
@@ -389,7 +431,7 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
                     if score is not None:
                         health_scores.append(float(score))
                 else:
-                    health_scores.append(1.0)  # 默认健康度
+                    health_scores.append(1.0)
             avg_health = sum(health_scores) / len(health_scores) if health_scores else 1.0
             endpoint_health_map[endpoint.id] = avg_health
         else:
@@ -399,7 +441,6 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
     avg_health_score = sum(all_health_scores) / len(all_health_scores) if all_health_scores else 1.0
     unhealthy_endpoints = sum(1 for score in all_health_scores if score < 0.5)
 
-    # 计算每个端点的活跃密钥数量
     active_keys_by_endpoint: dict[str, int] = {}
     for endpoint_id, keys in keys_by_endpoint.items():
         active_keys_by_endpoint[endpoint_id] = sum(1 for k in keys if k.is_active)
@@ -484,6 +525,119 @@ def _build_provider_summary(db: Session, provider: Provider) -> ProviderWithEndp
     )
 
 
+def _build_provider_summaries_batch(
+    db: Session, providers: list[Provider]
+) -> list[ProviderWithEndpointsSummary]:
+    if not providers:
+        return []
+
+    provider_ids = [provider.id for provider in providers]
+
+    endpoint_rows = (
+        db.query(ProviderEndpoint)
+        .options(
+            load_only(
+                ProviderEndpoint.id,
+                ProviderEndpoint.provider_id,
+                ProviderEndpoint.api_format,
+                ProviderEndpoint.is_active,
+            )
+        )
+        .filter(ProviderEndpoint.provider_id.in_(provider_ids))
+        .all()
+    )
+    endpoints_by_provider: dict[str, list[ProviderEndpoint]] = {}
+    for endpoint in endpoint_rows:
+        endpoints_by_provider.setdefault(str(endpoint.provider_id), []).append(endpoint)
+
+    key_rows = (
+        db.query(ProviderAPIKey)
+        .options(
+            load_only(
+                ProviderAPIKey.id,
+                ProviderAPIKey.provider_id,
+                ProviderAPIKey.is_active,
+                ProviderAPIKey.api_formats,
+                ProviderAPIKey.health_by_format,
+            )
+        )
+        .filter(ProviderAPIKey.provider_id.in_(provider_ids))
+        .all()
+    )
+    keys_by_provider: dict[str, list[ProviderAPIKey]] = {}
+    for key in key_rows:
+        keys_by_provider.setdefault(str(key.provider_id), []).append(key)
+
+    key_stats_rows = (
+        db.query(
+            ProviderAPIKey.provider_id.label("provider_id"),
+            func.count(ProviderAPIKey.id).label("total"),
+            func.sum(case((ProviderAPIKey.is_active == True, 1), else_=0)).label("active"),
+        )
+        .filter(ProviderAPIKey.provider_id.in_(provider_ids))
+        .group_by(ProviderAPIKey.provider_id)
+        .all()
+    )
+    key_stats_by_provider: dict[str, dict[str, int]] = {
+        str(row.provider_id): {
+            "total": int(row.total or 0),
+            "active": int(row.active or 0),
+        }
+        for row in key_stats_rows
+    }
+
+    model_stats_rows = (
+        db.query(
+            Model.provider_id.label("provider_id"),
+            func.count(Model.id).label("total"),
+            func.sum(case((Model.is_active == True, 1), else_=0)).label("active"),
+        )
+        .filter(Model.provider_id.in_(provider_ids))
+        .group_by(Model.provider_id)
+        .all()
+    )
+    model_stats_by_provider: dict[str, dict[str, int]] = {
+        str(row.provider_id): {
+            "total": int(row.total or 0),
+            "active": int(row.active or 0),
+        }
+        for row in model_stats_rows
+    }
+
+    global_model_rows = (
+        db.query(Model.provider_id, Model.global_model_id)
+        .filter(
+            Model.provider_id.in_(provider_ids),
+            Model.is_active == True,
+            Model.global_model_id.isnot(None),
+        )
+        .distinct()
+        .all()
+    )
+    global_model_ids_by_provider: dict[str, list[Any]] = {}
+    for provider_id, global_model_id in global_model_rows:
+        global_model_ids_by_provider.setdefault(str(provider_id), []).append(global_model_id)
+
+    summaries: list[ProviderWithEndpointsSummary] = []
+    for provider in providers:
+        pid = str(provider.id)
+        key_stats = key_stats_by_provider.get(pid, {"total": 0, "active": 0})
+        model_stats = model_stats_by_provider.get(pid, {"total": 0, "active": 0})
+        summaries.append(
+            _compose_provider_summary(
+                provider=provider,
+                endpoints=endpoints_by_provider.get(pid, []),
+                all_keys=keys_by_provider.get(pid, []),
+                total_keys=key_stats["total"],
+                active_keys=key_stats["active"],
+                total_models=model_stats["total"],
+                active_models=model_stats["active"],
+                global_model_ids=global_model_ids_by_provider.get(pid, []),
+            )
+        )
+    return summaries
+
+
 # -------- Adapters --------
 
 
@@ -493,6 +647,12 @@ class AdminProviderHealthMonitorAdapter(AdminApiAdapter):
     lookback_hours: int
     per_endpoint_limit: int
 
+    @cache_result(
+        key_prefix="admin:providers:health-monitor",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+        vary_by=["provider_id", "lookback_hours", "per_endpoint_limit"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
         provider = db.query(Provider).filter(Provider.id == self.provider_id).first()
@@ -501,6 +661,14 @@ class AdminProviderHealthMonitorAdapter(AdminApiAdapter):
 
         endpoints = (
             db.query(ProviderEndpoint)
+            .options(
+                load_only(
+                    ProviderEndpoint.id,
+                    ProviderEndpoint.provider_id,
+                    ProviderEndpoint.api_format,
+                    ProviderEndpoint.is_active,
+                )
+            )
             .filter(ProviderEndpoint.provider_id == self.provider_id)
             .all()
         )
@@ -508,7 +676,7 @@ class AdminProviderHealthMonitorAdapter(AdminApiAdapter):
         now = datetime.now(timezone.utc)
         since = now - timedelta(hours=self.lookback_hours)
 
-        endpoint_ids = [endpoint.id for endpoint in endpoints]
+        endpoint_ids = [str(endpoint.id) for endpoint in endpoints]
         if not endpoint_ids:
             response = ProviderEndpointHealthMonitorResponse(
                 provider_id=provider.id,
@@ -522,46 +690,65 @@ class AdminProviderHealthMonitorAdapter(AdminApiAdapter):
                 endpoint_count=0,
                 lookback_hours=self.lookback_hours,
             )
-            return response
+            return response.model_dump()
 
-        limit_rows = max(200, self.per_endpoint_limit * max(1, len(endpoint_ids)) * 2)
-        attempts_query = (
+        ranked_attempts_subq = (
             db.query(RequestCandidate)
+            .with_entities(
+                RequestCandidate.endpoint_id.label("endpoint_id"),
+                RequestCandidate.status.label("status"),
+                RequestCandidate.status_code.label("status_code"),
+                RequestCandidate.latency_ms.label("latency_ms"),
+                RequestCandidate.error_type.label("error_type"),
+                RequestCandidate.error_message.label("error_message"),
+                func.coalesce(
+                    RequestCandidate.finished_at,
+                    RequestCandidate.started_at,
+                    RequestCandidate.created_at,
+                ).label("event_timestamp"),
+                func.row_number()
+                .over(
+                    partition_by=RequestCandidate.endpoint_id,
+                    order_by=RequestCandidate.created_at.desc(),
+                )
+                .label("rn"),
+            )
             .filter(
                 RequestCandidate.endpoint_id.in_(endpoint_ids),
                 RequestCandidate.created_at >= since,
             )
-            .order_by(RequestCandidate.created_at.desc())
+            .subquery()
+        )
+        attempt_rows = (
+            db.query(ranked_attempts_subq)
+            .filter(ranked_attempts_subq.c.rn <= self.per_endpoint_limit)
+            .order_by(
+                ranked_attempts_subq.c.endpoint_id.asc(),
+                ranked_attempts_subq.c.event_timestamp.asc(),
+            )
+            .all()
         )
-        attempts = attempts_query.limit(limit_rows).all()
 
-        buffered_attempts: dict[str, list[RequestCandidate]] = {eid: [] for eid in endpoint_ids}
-        counters: dict[str, int] = {eid: 0 for eid in endpoint_ids}
-
-        for attempt in attempts:
-            if not attempt.endpoint_id or attempt.endpoint_id not in buffered_attempts:
+        events_by_endpoint: dict[str, list[EndpointHealthEvent]] = {eid: [] for eid in endpoint_ids}
+        for row in attempt_rows:
+            endpoint_id = str(row.endpoint_id) if row.endpoint_id is not None else ""
+            if not endpoint_id or endpoint_id not in events_by_endpoint:
                 continue
-            if counters[attempt.endpoint_id] >= self.per_endpoint_limit:
-                continue
-            buffered_attempts[attempt.endpoint_id].append(attempt)
-            counters[attempt.endpoint_id] += 1
+            events_by_endpoint[endpoint_id].append(
+                EndpointHealthEvent(
+                    timestamp=row.event_timestamp,
+                    status=row.status,
+                    status_code=row.status_code,
+                    latency_ms=row.latency_ms,
+                    error_type=row.error_type,
+                    error_message=row.error_message,
+                )
+            )
 
         endpoint_monitors: list[EndpointHealthMonitor] = []
         for endpoint in endpoints:
-            attempt_list = list(reversed(buffered_attempts.get(endpoint.id, [])))
-            events: list[EndpointHealthEvent] = []
-            for attempt in attempt_list:
-                event_timestamp = attempt.finished_at or attempt.started_at or attempt.created_at
-                events.append(
-                    EndpointHealthEvent(
-                        timestamp=event_timestamp,
-                        status=attempt.status,
-                        status_code=attempt.status_code,
-                        latency_ms=attempt.latency_ms,
-                        error_type=attempt.error_type,
-                        error_message=attempt.error_message,
-                    )
-                )
+            endpoint_id = str(endpoint.id)
+            events = events_by_endpoint.get(endpoint_id, [])
 
             success_count = sum(1 for event in events if event.status == "success")
             failed_count = sum(1 for event in events if event.status == "failed")
@@ -598,10 +785,15 @@ class AdminProviderHealthMonitorAdapter(AdminApiAdapter):
             lookback_hours=self.lookback_hours,
             per_endpoint_limit=self.per_endpoint_limit,
         )
-        return response
+        return response.model_dump()
 
 
 class AdminProviderSummaryAdapter(AdminApiAdapter):
+    @cache_result(
+        key_prefix="admin:providers:summary",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
         providers = (
@@ -609,7 +801,25 @@ class AdminProviderSummaryAdapter(AdminApiAdapter):
             .order_by(Provider.provider_priority.asc(), Provider.created_at.asc())
             .all()
         )
-        return [_build_provider_summary(db, provider) for provider in providers]
+        return [item.model_dump() for item in _build_provider_summaries_batch(db, providers)]
+
+
+@dataclass
+class AdminProviderDetailAdapter(AdminApiAdapter):
+    provider_id: str
+
+    @cache_result(
+        key_prefix="admin:providers:summary:detail",
+        ttl=CacheTTL.ADMIN_USAGE_RECORDS,
+        user_specific=False,
+        vary_by=["provider_id"],
+    )
+    async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
+        db = context.db
+        provider = db.query(Provider).filter(Provider.id == self.provider_id).first()
+        if not provider:
+            raise NotFoundException(f"Provider {self.provider_id} not found")
+        return _build_provider_summary(db, provider).model_dump()
 
 
 @dataclass

src/api/admin/stats/comparison.py

@@ -10,9 +10,11 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.database import get_db
 from src.services.system.stats_aggregator import AggregatedStats, StatsFilter, query_stats_hybrid
 from src.services.system.time_range import TimeRangeParams
+from src.utils.cache_decorator import cache_result
 
 from .common import pipeline
 
@@ -34,6 +36,18 @@ class AdminComparisonAdapter(AdminApiAdapter):
         self.timezone_name = timezone_name
         self.tz_offset_minutes = tz_offset_minutes
 
+    @cache_result(
+        key_prefix="admin:stats:comparison",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "current_start",
+            "current_end",
+            "comparison_type",
+            "timezone_name",
+            "tz_offset_minutes",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         if self.current_start > self.current_end:
             raise HTTPException(status_code=400, detail="current_start must be <= current_end")

src/api/admin/stats/cost.py

@@ -11,10 +11,12 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.database import get_db
 from src.models.database import Usage
 from src.services.system.stats_aggregator import query_time_series
 from src.services.system.time_range import TimeRangeParams
+from src.utils.cache_decorator import cache_result
 
 from .common import (
     _apply_admin_default_range,
@@ -40,11 +42,27 @@ class AdminCostForecastAdapter(AdminApiAdapter):
         self.days = days
         self.forecast_days = forecast_days
         self.timezone_name = timezone_name
-        self.tz_offset_minutes = tz_offset_minutes
+        self.fallback_tz_offset_minutes = tz_offset_minutes
 
+    @cache_result(
+        key_prefix="admin:stats:cost:forecast",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "time_range.start_date",
+            "time_range.end_date",
+            "time_range.preset",
+            "time_range.timezone",
+            "time_range.tz_offset_minutes",
+            "days",
+            "forecast_days",
+            "timezone_name",
+            "fallback_tz_offset_minutes",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         time_range = self.time_range or _build_time_range_from_days(
-            self.days, self.timezone_name, self.tz_offset_minutes
+            self.days, self.timezone_name, self.fallback_tz_offset_minutes
         )
         time_range.granularity = "day"
         try:
@@ -120,6 +138,20 @@ class AdminCostSavingsAdapter(AdminApiAdapter):
         self.provider_name = provider_name
         self.model = model
 
+    @cache_result(
+        key_prefix="admin:stats:cost:savings",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "time_range.start_date",
+            "time_range.end_date",
+            "time_range.preset",
+            "time_range.timezone",
+            "time_range.tz_offset_minutes",
+            "provider_name",
+            "model",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         if not self.time_range:
             return {

src/api/admin/stats/errors.py

@@ -11,9 +11,11 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.database import get_db
 from src.models.database import StatsDailyError, Usage
 from src.services.system.time_range import TimeRangeParams
+from src.utils.cache_decorator import cache_result
 
 from .common import _apply_admin_default_range, _build_time_range_params, pipeline
 
@@ -24,6 +26,18 @@ class AdminErrorDistributionAdapter(AdminApiAdapter):
     def __init__(self, time_range: TimeRangeParams | None) -> None:
         self.time_range = _apply_admin_default_range(time_range)
 
+    @cache_result(
+        key_prefix="admin:stats:errors:distribution",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "time_range.start_date",
+            "time_range.end_date",
+            "time_range.preset",
+            "time_range.timezone",
+            "time_range.tz_offset_minutes",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         if not self.time_range:
             return {"distribution": [], "trend": []}

src/api/admin/stats/performance.py

@@ -10,10 +10,12 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.database import get_db
 from src.models.database import StatsDaily
 from src.services.system.stats_aggregator import StatsAggregatorService
 from src.services.system.time_range import TimeRangeParams
+from src.utils.cache_decorator import cache_result
 
 from .common import _apply_admin_default_range, _build_time_range_params, pipeline
 
@@ -24,6 +26,18 @@ class AdminPercentilesAdapter(AdminApiAdapter):
     def __init__(self, time_range: TimeRangeParams | None) -> None:
         self.time_range = _apply_admin_default_range(time_range)
 
+    @cache_result(
+        key_prefix="admin:stats:performance:percentiles",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "time_range.start_date",
+            "time_range.end_date",
+            "time_range.preset",
+            "time_range.timezone",
+            "time_range.tz_offset_minutes",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         if not self.time_range:
             return []

src/api/admin/stats/quota.py

@@ -10,9 +10,11 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.core.enums import ProviderBillingType
 from src.database import get_db
 from src.models.database import Provider
+from src.utils.cache_decorator import cache_result
 
 from .common import pipeline
 
@@ -20,6 +22,11 @@ router = APIRouter()
 
 
 class AdminQuotaUsageAdapter(AdminApiAdapter):
+    @cache_result(
+        key_prefix="admin:stats:providers:quota_usage",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
         providers = (

src/api/admin/stats/time_series.py

@@ -10,9 +10,11 @@ from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
+from src.config.constants import CacheTTL
 from src.database import get_db
 from src.services.system.stats_aggregator import TimeSeriesFilter, query_time_series
 from src.services.system.time_range import TimeRangeParams
+from src.utils.cache_decorator import cache_result
 
 from .common import _apply_admin_default_range, _build_time_range_params, pipeline
 
@@ -32,6 +34,22 @@ class AdminTimeSeriesAdapter(AdminApiAdapter):
         self.model = model
         self.provider_name = provider_name
 
+    @cache_result(
+        key_prefix="admin:stats:time_series",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=[
+            "time_range.start_date",
+            "time_range.end_date",
+            "time_range.preset",
+            "time_range.timezone",
+            "time_range.tz_offset_minutes",
+            "time_range.granularity",
+            "user_id",
+            "model",
+            "provider_name",
+        ],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         if not self.time_range:
             return []

src/api/admin/system.py

@@ -9,11 +9,13 @@ from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Request, status
 from pydantic import ValidationError
+from sqlalchemy import case, func
 from sqlalchemy.orm import Session
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
 from src.api.base.pipeline import ApiRequestPipeline
+from src.config.constants import CacheTTL
 from src.core.exceptions import InvalidRequestException, NotFoundException, translate_pydantic_error
 from src.core.logger import logger
 from src.database import get_db
@@ -21,6 +23,7 @@ from src.models.api import SystemSettingsRequest, SystemSettingsResponse
 from src.models.database import ApiKey, Provider, Usage, User
 from src.services.email.email_template import EmailTemplate
 from src.services.system.config import SystemConfigService
+from src.utils.cache_decorator import cache_result
 
 router = APIRouter(prefix="/api/admin/system", tags=["Admin - System"])
 
@@ -749,14 +752,27 @@ class AdminDeleteSystemConfigAdapter(AdminApiAdapter):
 
 
 class AdminSystemStatsAdapter(AdminApiAdapter):
+    @cache_result(
+        key_prefix="admin:system:stats",
+        ttl=CacheTTL.DASHBOARD_STATS,
+        user_specific=False,
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
-        total_users = db.query(User).count()
-        active_users = db.query(User).filter(User.is_active.is_(True)).count()
-        total_providers = db.query(Provider).count()
-        active_providers = db.query(Provider).filter(Provider.is_active.is_(True)).count()
-        total_api_keys = db.query(ApiKey).count()
-        total_requests = db.query(Usage).count()
+        user_stats = db.query(
+            func.count(User.id).label("total"),
+            func.sum(case((User.is_active.is_(True), 1), else_=0)).label("active"),
+        ).first()
+        provider_stats = db.query(
+            func.count(Provider.id).label("total"),
+            func.sum(case((Provider.is_active.is_(True), 1), else_=0)).label("active"),
+        ).first()
+        total_api_keys = int(db.query(func.count(ApiKey.id)).scalar() or 0)
+        total_requests = int(db.query(func.count(Usage.id)).scalar() or 0)
+        total_users = int(user_stats.total or 0) if user_stats else 0
+        active_users = int(user_stats.active or 0) if user_stats else 0
+        total_providers = int(provider_stats.total or 0) if provider_stats else 0
+        active_providers = int(provider_stats.active or 0) if provider_stats else 0
 
         return {
             "users": {"total": total_users, "active": active_users},
@@ -776,16 +792,18 @@ class AdminTriggerCleanupAdapter(AdminApiAdapter):
         db = context.db
 
         # 获取清理前的统计信息
-        total_before = db.query(Usage).count()
+        total_before = int(db.query(func.count(Usage.id)).scalar() or 0)
         with_body_before = (
-            db.query(Usage)
+            db.query(func.count(Usage.id))
             .filter((Usage.request_body.isnot(None)) | (Usage.response_body.isnot(None)))
-            .count()
+            .scalar()
+            or 0
         )
         with_headers_before = (
-            db.query(Usage)
+            db.query(func.count(Usage.id))
             .filter((Usage.request_headers.isnot(None)) | (Usage.response_headers.isnot(None)))
-            .count()
+            .scalar()
+            or 0
         )
 
         # 触发清理
@@ -793,16 +811,18 @@ class AdminTriggerCleanupAdapter(AdminApiAdapter):
         await maintenance_scheduler._perform_cleanup()
 
         # 获取清理后的统计信息
-        total_after = db.query(Usage).count()
+        total_after = int(db.query(func.count(Usage.id)).scalar() or 0)
         with_body_after = (
-            db.query(Usage)
+            db.query(func.count(Usage.id))
             .filter((Usage.request_body.isnot(None)) | (Usage.response_body.isnot(None)))
-            .count()
+            .scalar()
+            or 0
         )
         with_headers_after = (
-            db.query(Usage)
+            db.query(func.count(Usage.id))
             .filter((Usage.request_headers.isnot(None)) | (Usage.response_headers.isnot(None)))
-            .count()
+            .scalar()
+            or 0
         )
 
         return {
@@ -2402,11 +2422,11 @@ class AdminPurgeConfigAdapter(AdminApiAdapter):
         db = context.db
 
         # 统计
-        providers_count = db.query(Provider).count()
-        endpoints_count = db.query(ProviderEndpoint).count()
-        keys_count = db.query(ProviderAPIKey).count()
-        models_count = db.query(Model).count()
-        global_models_count = db.query(GlobalModel).count()
+        providers_count = int(db.query(func.count(Provider.id)).scalar() or 0)
+        endpoints_count = int(db.query(func.count(ProviderEndpoint.id)).scalar() or 0)
+        keys_count = int(db.query(func.count(ProviderAPIKey.id)).scalar() or 0)
+        models_count = int(db.query(func.count(Model.id)).scalar() or 0)
+        global_models_count = int(db.query(func.count(GlobalModel.id)).scalar() or 0)
 
         # VideoTask 的 provider_id/endpoint_id/key_id 无 ondelete，置 NULL 保留任务记录
         db.query(VideoTask).filter(
@@ -2471,7 +2491,9 @@ class AdminPurgeUsersAdapter(AdminApiAdapter):
             )
 
             # 统计关联 API Keys 数量（DB 级别 CASCADE 会随 User 自动删除）
-            keys_count = db.query(ApiKey).filter(ApiKey.user_id.in_(user_ids)).count()
+            keys_count = int(
+                db.query(func.count(ApiKey.id)).filter(ApiKey.user_id.in_(user_ids)).scalar() or 0
+            )
 
             # 将使用记录的 user_id 置空（保留记录）
             db.query(Usage).filter(Usage.user_id.in_(user_ids)).update(
@@ -2565,9 +2587,9 @@ class AdminPurgeUsageAdapter(AdminApiAdapter):
 
         db = context.db
 
-        usage_count = db.query(Usage).count()
-        candidates_count = db.query(RequestCandidate).count()
-        usage_counts_count = db.query(UserModelUsageCount).count()
+        usage_count = int(db.query(func.count(Usage.id)).scalar() or 0)
+        candidates_count = int(db.query(func.count(RequestCandidate.id)).scalar() or 0)
+        usage_counts_count = int(db.query(func.count(UserModelUsageCount.id)).scalar() or 0)
 
         # 清空使用记录
         db.query(RequestCandidate).delete()
@@ -2594,7 +2616,7 @@ class AdminPurgeAuditLogsAdapter(AdminApiAdapter):
 
         db = context.db
 
-        count = db.query(AuditLog).count()
+        count = int(db.query(func.count(AuditLog.id)).scalar() or 0)
         db.query(AuditLog).delete()
         db.commit()
 
@@ -2612,8 +2634,8 @@ class AdminPurgeRequestBodiesAdapter(AdminApiAdapter):
         db = context.db
 
         # 统计有 body 的记录数
-        with_body = (
-            db.query(Usage)
+        with_body = int(
+            db.query(func.count(Usage.id))
             .filter(
                 (Usage.request_body.isnot(None))
                 | (Usage.response_body.isnot(None))
@@ -2624,7 +2646,8 @@ class AdminPurgeRequestBodiesAdapter(AdminApiAdapter):
                 | (Usage.provider_request_body_compressed.isnot(None))
                 | (Usage.client_response_body_compressed.isnot(None))
             )
-            .count()
+            .scalar()
+            or 0
         )
 
         # 批量清空所有 body 字段

src/api/admin/usage/routes.py

@@ -2117,7 +2117,7 @@ class CacheHitAnalysisAdapter(AdminApiAdapter):
 async def get_interval_timeline(
     request: Request,
     hours: int = Query(24, ge=1, le=720, description="分析最近多少小时的数据"),
-    limit: int = Query(10000, ge=100, le=50000, description="最大返回数据点数量"),
+    limit: int = Query(3000, ge=100, le=50000, description="最大返回数据点数量"),
     user_id: str | None = Query(None, description="指定用户 ID"),
     include_user_info: bool = Query(False, description="是否包含用户信息（用于管理员多用户视图）"),
     db: Session = Depends(get_db),
@@ -2156,6 +2156,12 @@ class IntervalTimelineAdapter(AdminApiAdapter):
         self.user_id = user_id
         self.include_user_info = include_user_info
 
+    @cache_result(
+        key_prefix="admin:usage:interval_timeline",
+        ttl=CacheTTL.ADMIN_USAGE_AGGREGATION,
+        user_specific=False,
+        vary_by=["hours", "limit", "user_id", "include_user_info"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
 

src/api/admin/users/routes.py

@@ -7,11 +7,13 @@ from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
 from pydantic import ValidationError
-from sqlalchemy.orm import Session
+from sqlalchemy import func
+from sqlalchemy.orm import Session, load_only
 
 from src.api.base.admin_adapter import AdminApiAdapter
 from src.api.base.context import ApiRequestContext
 from src.api.base.pipeline import ApiRequestPipeline
+from src.config.constants import CacheTTL
 from src.core.exceptions import InvalidRequestException, NotFoundException, translate_pydantic_error
 from src.core.logger import logger
 from src.database import get_db
@@ -21,6 +23,7 @@ from src.models.database import ApiKey, User, UserRole
 from src.services.system.config import SystemConfigService
 from src.services.user.apikey import ApiKeyService
 from src.services.user.service import UserService
+from src.utils.cache_decorator import cache_result
 
 router = APIRouter(prefix="/api/admin/users", tags=["Admin - Users"])
 pipeline = ApiRequestPipeline()
@@ -282,10 +285,43 @@ class AdminListUsersAdapter(AdminApiAdapter):
         self.role = role
         self.is_active = is_active
 
+    @cache_result(
+        key_prefix="admin:users:list",
+        ttl=CacheTTL.USER,
+        user_specific=False,
+        vary_by=["skip", "limit", "role", "is_active"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:  # type: ignore[override]
         db = context.db
-        role_enum = UserRole[self.role.upper()] if self.role else None
-        users = UserService.list_users(db, self.skip, self.limit, role_enum, self.is_active)
+        role_enum = None
+        if self.role:
+            try:
+                role_enum = UserRole[self.role.upper()]
+            except KeyError as exc:
+                raise InvalidRequestException("角色参数不合法") from exc
+
+        query = db.query(User).options(
+            load_only(
+                User.id,
+                User.email,
+                User.username,
+                User.role,
+                User.allowed_providers,
+                User.allowed_api_formats,
+                User.allowed_models,
+                User.quota_usd,
+                User.used_usd,
+                User.total_usd,
+                User.is_active,
+                User.created_at,
+            )
+        )
+        if role_enum:
+            query = query.filter(User.role == role_enum)
+        if self.is_active is not None:
+            query = query.filter(User.is_active == self.is_active)
+
+        users = query.order_by(User.created_at.desc()).offset(self.skip).limit(self.limit).all()
         return [
             {
                 "id": u.id,
@@ -416,7 +452,9 @@ class AdminDeleteUserAdapter(AdminApiAdapter):
             raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="用户不存在")
 
         if user.role == UserRole.ADMIN:
-            admin_count = db.query(User).filter(User.role == UserRole.ADMIN).count()
+            admin_count = int(
+                db.query(func.count(User.id)).filter(User.role == UserRole.ADMIN).scalar() or 0
+            )
             if admin_count <= 1:
                 raise InvalidRequestException("不能删除最后一个管理员账户")
 

src/api/admin/video_tasks/routes.py

@@ -18,11 +18,13 @@ from src.api.base.context import ApiRequestContext
 from src.api.base.pipeline import ApiRequestPipeline
 from src.api.dashboard.routes import DashboardAdapter
 from src.clients.http_client import HTTPClientPool
+from src.config.constants import CacheTTL
 from src.core.crypto import crypto_service
 from src.core.enums import UserRole
 from src.core.logger import logger
 from src.database import get_db
 from src.models.database import Provider, ProviderAPIKey, ProviderEndpoint, User, VideoTask
+from src.utils.cache_decorator import cache_result
 
 router = APIRouter(prefix="/api/admin/video-tasks", tags=["Admin - Video Tasks"])
 pipeline = ApiRequestPipeline()
@@ -247,6 +249,12 @@ class VideoTaskListAdapter(DashboardAdapter):
     page: int
     page_size: int
 
+    @cache_result(
+        key_prefix="admin:video_tasks:list",
+        ttl=min(5, CacheTTL.ADMIN_USAGE_RECORDS),
+        user_specific=True,
+        vary_by=["status", "user_id", "model", "page", "page_size"],
+    )
     async def handle(self, context: ApiRequestContext) -> Any:
         db = context.db
         user = context.user
@@ -270,8 +278,8 @@ class VideoTaskListAdapter(DashboardAdapter):
             escaped = self.model.replace("%", "\\%").replace("_", "\\_")
             query = query.filter(VideoTask.model.ilike(f"%{escaped}%"))
 
-        # 统计总数
-        total = query.count()
+        # 统计总数（避免 Query.count() 生成大子查询）
+        total = int(query.with_entities(func.count(VideoTask.id)).scalar() or 0)
 
         # 分页
         offset = (self.page - 1) * self.page_size
@@ -341,6 +349,11 @@ class VideoTaskListAdapter(DashboardAdapter):
 class VideoTaskStatsAdapter(DashboardAdapter):
     """视频任务统计适配器"""
 
+    @cache_result(
+        key_prefix="admin:video_tasks:stats",
+        ttl=min(5, CacheTTL.ADMIN_USAGE_RECORDS),
+        user_specific=True,
+    )
     async def handle(self, context: ApiRequestContext) -> Any:
         db = context.db
         user = context.user
@@ -350,8 +363,8 @@ class VideoTaskStatsAdapter(DashboardAdapter):
         if not is_admin:
             base_query = base_query.filter(VideoTask.user_id == user.id)
 
-        # 总数
-        total = base_query.count()
+        # 总数（避免 Query.count() 生成大子查询）
+        total = int(base_query.with_entities(func.count(VideoTask.id)).scalar() or 0)
 
         # 按状态分组
         status_stats = (
@@ -379,7 +392,12 @@ class VideoTaskStatsAdapter(DashboardAdapter):
 
         # 今日任务数
         today = datetime.now(timezone.utc).replace(hour=0, minute=0, second=0, microsecond=0)
-        today_count = base_query.filter(VideoTask.created_at >= today).count()
+        today_count = int(
+            base_query.filter(VideoTask.created_at >= today)
+            .with_entities(func.count(VideoTask.id))
+            .scalar()
+            or 0
+        )
 
         # 管理员额外统计
         result = {