diff --git a/app/migration.py b/app/migration.py
index 89ae255..5e45e23 100644
--- a/app/migration.py
+++ b/app/migration.py
@@ -4,12 +4,19 @@
 import logging
 
 from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import make_transient, sessionmaker
 
 from app.config import DB_PATH
 from app.models import MarketData, SymbolTimestamp
 from app.mysql_database import MySQLSessionLocal
 
+
+def _prepare_records_for_new_session(records):
+    """将 ORM 实例转换为可在新 session 中插入的 transient 状态。"""
+    for record in records:
+        make_transient(record)
+        record.id = None
+
 logger = logging.getLogger(__name__)
 
 
@@ -48,6 +55,9 @@ def migrate_sqlite_to_mysql():
         finally:
             sqlite_session.close()
 
+        _prepare_records_for_new_session(market_data_records)
+        _prepare_records_for_new_session(symbol_timestamp_records)
+
         if market_data_records:
             mysql_session.add_all(market_data_records)
         if symbol_timestamp_records:
diff --git a/tests/test_dual_write_and_migration.py b/tests/test_dual_write_and_migration.py
index b305830..244eb46 100644
--- a/tests/test_dual_write_and_migration.py
+++ b/tests/test_dual_write_and_migration.py
@@ -253,11 +253,6 @@ class TestMigrationIntegrity:
         assert len(added_symbol_timestamps) == 0
         mysql_session.commit.assert_not_called()
 
-    @pytest.mark.xfail(
-        reason="app/migration.py 对 detached ORM 实例直接 add_all 不会触发 INSERT，"
-        "需使用 make_transient() 或重新构造记录。",
-        strict=False,
-    )
     def test_migration_end_to_end_with_in_memory_databases(self, tmp_path):
         """使用真实内存数据库验证迁移前后数据条数一致（当前已知缺陷）。"""
         sqlite_engine, sqlite_market_count, sqlite_timestamp_count = (