fix: 6 bug fixes - timezone CST, knowledge_ids mismatch, skill uninstall, dashboard stats, chat knowledge retrieval, skill selection

backend/python/app/api/token_usage.py

@@ -4,7 +4,7 @@ from sqlalchemy import and_, desc, asc, func, extract
 from pydantic import BaseModel, Field
 from typing import Optional
 import uuid
-from datetime import datetime, date, timedelta
+from datetime import datetime, date, timedelta, timezone
 
 from ..database import get_db
 from ..models import (
@@ -16,6 +16,9 @@ from ..middleware.log_service import LogService
 
 router = APIRouter()
 
+# CST timezone (UTC+8)
+CST_TZ = timezone(timedelta(hours=8))
+
 
 class RechargeRequest(BaseModel):
     amount: int = Field(ge=1)
@@ -32,12 +35,15 @@ def get_overview(
         TokenUsageLog.user_id == current_user.id
     ).scalar()
 
-    # 今日使用中应用数
-    today_start = datetime.combine(date.today(), datetime.min.time())
+    # 今日使用中应用数 - 使用CST时区的"今天"
+    now_cst = datetime.now(CST_TZ)
+    today_start = now_cst.replace(hour=0, minute=0, second=0, microsecond=0)
+    # Convert to UTC for DB comparison since container uses UTC timestamps
+    today_start_utc = today_start.astimezone(timezone.utc).replace(tzinfo=None)
     today_apps = db.query(func.count(func.distinct(TokenUsageLog.model_id))).filter(
         and_(
             TokenUsageLog.user_id == current_user.id,
-            TokenUsageLog.created_at >= today_start,
+            TokenUsageLog.created_at >= today_start_utc,
         )
     ).scalar() or 0
 
@@ -46,9 +52,7 @@ def get_overview(
         TokenBalance.user_id == current_user.id
     ).first()
 
-    from datetime import timezone, timedelta
-    shanghai_tz = timezone(timedelta(hours=8))
-    server_time = datetime.now(shanghai_tz).isoformat()
+    server_time = datetime.now(CST_TZ).isoformat()
 
     return {
         "code": 0,
@@ -169,7 +173,7 @@ def get_token_logs(
             "completion_tokens": log_item.completion_tokens or 0,
             "total_tokens": log_item.total_tokens or 0,
             "conversation_id": log_item.conversation_id,
-            "created_at": log_item.created_at.isoformat() if log_item.created_at else None,
+            "created_at": _format_cst_time(log_item.created_at),
         })
 
     return {
@@ -245,3 +249,13 @@ def recharge(
         },
         "message": "充值成功",
     }
+
+
+def _format_cst_time(dt_value):
+    """Format datetime to CST ISO string. Input is UTC naive datetime from DB."""
+    if dt_value is None:
+        return None
+    # DB stores UTC naive datetime, convert to CST
+    utc_dt = dt_value.replace(tzinfo=timezone.utc)
+    cst_dt = utc_dt.astimezone(CST_TZ)
+    return cst_dt.isoformat()