diff --git a/app/admin/repositories/queries.py b/app/admin/repositories/queries.py
index 75550e7..21a3775 100644
--- a/app/admin/repositories/queries.py
+++ b/app/admin/repositories/queries.py
@@ -1228,6 +1228,11 @@ def _cn_wall_to_utc(dt: datetime) -> datetime:
     return dt.replace(tzinfo=rewards.CN_TZ).astimezone(timezone.utc).replace(tzinfo=None)
 
 
+def _coin_record_sort_key(row: dict) -> datetime:
+    """金币明细跨数据源排序键：兼容 SQLite naive 与 PostgreSQL aware 时间。"""
+    return _as_utc(row["created_at"])
+
+
 def user_coin_records(
     db: Session,
     user_id: int,
@@ -1319,7 +1324,10 @@ def user_coin_records(
             "coin": rec.amount,
         })
 
-    rows.sort(key=lambda r: r["created_at"], reverse=True)
+    # SQLite 常返回 naive datetime，PostgreSQL timestamptz 返回 aware datetime；
+    # 统一成 aware UTC 排序，避免线上合并广告记录与签到记录时抛
+    # “can't compare offset-naive and offset-aware datetimes”。
+    rows.sort(key=_coin_record_sort_key, reverse=True)
     has_more = len(rows) > offset + limit
 
     # 总数 = 三源在窗口内 granted 计数之和(供前端页码分页渲染页码/共 N 条)
diff --git a/app/admin/routers/users.py b/app/admin/routers/users.py
index fce483a..da4c8c3 100644
--- a/app/admin/routers/users.py
+++ b/app/admin/routers/users.py
@@ -86,7 +86,7 @@ def get_user_reward_stats(
     date_to: Annotated[datetime | None, Query()] = None,
 ) -> UserRewardStats:
     """提现详情抽屉「用户统计区」。date_from/date_to 都不传 = 注册至今(全量)。"""
-    if user_repo.get_user_by_id(db, user_id) is None:
+    if not user_repo.user_exists(db, user_id):
         raise HTTPException(status_code=404, detail="用户不存在")
     return UserRewardStats(
         **queries.user_reward_stats(db, user_id, date_from=date_from, date_to=date_to)
diff --git a/app/repositories/user.py b/app/repositories/user.py
index 2157cfc..f0a2a0a 100644
--- a/app/repositories/user.py
+++ b/app/repositories/user.py
@@ -93,6 +93,11 @@ def get_user_by_id(db: Session, user_id: int) -> User | None:
     return db.get(User, user_id)
 
 
+def user_exists(db: Session, user_id: int) -> bool:
+    """只查主键判断用户是否存在，避免只读统计接口依赖完整用户表结构。"""
+    return db.scalar(select(User.id).where(User.id == user_id)) is not None
+
+
 def get_user_by_phone(db: Session, phone: str) -> User | None:
     stmt = select(User).where(User.phone == phone)
     return db.execute(stmt).scalar_one_or_none()
diff --git a/tests/test_admin_read.py b/tests/test_admin_read.py
index 06b19aa..dfe720d 100644
--- a/tests/test_admin_read.py
+++ b/tests/test_admin_read.py
@@ -1,7 +1,7 @@
 """Admin M2 读接口测试:大盘聚合 + 用户/流水/提现/反馈列表 + 鉴权拦截。"""
 from __future__ import annotations
 
-from datetime import datetime
+from datetime import UTC, datetime
 
 import pytest
 from fastapi.testclient import TestClient
@@ -9,6 +9,7 @@ from sqlalchemy import event
 
 from app.admin.main import admin_app
 from app.admin.repositories import admin_user as admin_repo
+from app.admin.repositories import queries
 from app.db.session import SessionLocal, engine
 from app.models.comparison import ComparisonRecord
 from app.models.feedback import Feedback
@@ -144,6 +145,8 @@ def test_user_reward_detail_does_not_select_unrelated_new_ad_columns(
     ) -> None:
         if "ad_reward_record.boost_round_id" in statement:
             raise AssertionError("提现详情不应查询未使用的 boost_round_id")
+        if "FROM user" in statement and "user.phone" in statement:
+            raise AssertionError("奖励统计的用户存在性检查不应展开完整 user 表")
 
     event.listen(engine, "before_cursor_execute", reject_full_ad_reward_projection)
     try:
@@ -162,6 +165,17 @@ def test_user_reward_detail_does_not_select_unrelated_new_ad_columns(
     assert records.status_code == 200, records.text
 
 
+def test_user_coin_record_sort_accepts_mixed_timezone_datetimes() -> None:
+    """线上 PostgreSQL 返回 aware，SQLite/历史转换可能返回 naive，二者必须可混排。"""
+    naive = datetime(2038, 1, 1, 8, 0)
+    aware = datetime(2038, 1, 1, 7, 0, tzinfo=UTC)
+
+    rows = [{"created_at": aware}, {"created_at": naive}]
+    rows.sort(key=queries._coin_record_sort_key, reverse=True)
+
+    assert rows == [{"created_at": naive}, {"created_at": aware}]
+
+
 def test_user_filter_by_status(admin_client: TestClient, admin_token: str) -> None:
     _seed_user_with_data("13800000003")
     r = admin_client.get("/admin/api/users", params={"status": "active"}, headers=_auth(admin_token))