✨ feat(sync): add data consistency compare (count + ID-set)

tests/test_access_reader.py

@@ -6,6 +6,7 @@ No real log rows are deleted.
 """
 import os
 import pytest
+from unittest.mock import MagicMock
 
 from sync.access_reader import AccessReader
 from sync.config import load_config
@@ -35,3 +36,23 @@ def test_read_log_and_row_and_delete():
         r.delete_log_ids([], 100, 3)  # empty list -> no-op, must not raise
     finally:
         r.close()
+
+
+def test_count_rows_executes_count_sql_and_returns_value():
+    r = AccessReader("dummy.accdb", "{Microsoft Access Driver (*.accdb, *.mdb)}")
+    cur = MagicMock()
+    cur.fetchone.return_value = (42,)
+    r._conn = MagicMock()  # bypass lazy connect
+    r._conn.cursor.return_value = cur
+    assert r.count_rows("表壳焊接记录") == 42
+    cur.execute.assert_called_once_with('SELECT COUNT(*) FROM "表壳焊接记录"')
+
+
+def test_read_ids_returns_ordered_id_list():
+    r = AccessReader("dummy.accdb", "{Microsoft Access Driver (*.accdb, *.mdb)}")
+    cur = MagicMock()
+    cur.fetchall.return_value = [(1,), (3,), (5,)]
+    r._conn = MagicMock()
+    r._conn.cursor.return_value = cur
+    assert r.read_ids("T") == [1, 3, 5]
+    cur.execute.assert_called_once_with('SELECT ID FROM "T" ORDER BY ID')