feat: 添加 /api/stats/daily 每日统计接口

backend/app/routers/stats.py

@@ -7,7 +7,7 @@ from sqlalchemy import func
 
 from ..database import get_db
 from ..config import get_settings
-from ..models.stats import AICallEvent
+from ..models.stats import AICallEvent, TenantUsageDaily
 from ..schemas.stats import AICallEventCreate, AICallEventResponse, BatchReportRequest
 from ..services.auth import decode_token
 
@@ -131,3 +131,42 @@ async def get_stats_trend(
         current += timedelta(days=1)
     
     return {"trend": trend}
+
+
+@router.get("/daily")
+async def get_daily_stats(
+    tenant_id: Optional[str] = None,
+    app_code: Optional[str] = None,
+    start_date: Optional[str] = None,
+    end_date: Optional[str] = None,
+    db: Session = Depends(get_db),
+    user = Depends(get_current_user_optional)
+):
+    """获取每日统计数据"""
+    query = db.query(TenantUsageDaily)
+    
+    if tenant_id:
+        query = query.filter(TenantUsageDaily.tenant_id == tenant_id)
+    if app_code:
+        query = query.filter(TenantUsageDaily.app_code == app_code)
+    if start_date:
+        query = query.filter(TenantUsageDaily.stat_date >= start_date)
+    if end_date:
+        query = query.filter(TenantUsageDaily.stat_date <= end_date)
+    
+    results = query.order_by(TenantUsageDaily.stat_date.desc()).all()
+    
+    return {
+        "items": [
+            {
+                "id": r.id,
+                "tenant_id": r.tenant_id,
+                "app_code": r.app_code,
+                "stat_date": str(r.stat_date) if r.stat_date else None,
+                "ai_calls": r.ai_calls or 0,
+                "ai_tokens": r.ai_tokens or 0,
+                "ai_cost": float(r.ai_cost) if r.ai_cost else 0.0
+            }
+            for r in results
+        ]
+    }