chore: initial baseline with P0-safety .gitignore

backend/migrate_employee_v53.py

@@ -0,0 +1,24 @@
+import sqlite3
+conn = sqlite3.connect('it_smart_desk.db')
+cursor = conn.cursor()
+
+# Employee 表新增字段
+alterations = [
+    ("it_level", "VARCHAR(20)", "'silver'"),
+    ("it_level_source", "VARCHAR(20)", "'system'"),
+    ("notes", "JSON", "'{}'"),
+]
+
+for col_name, col_type, default_val in alterations:
+    try:
+        cursor.execute(f"ALTER TABLE employees ADD COLUMN {col_name} {col_type} NOT NULL DEFAULT {default_val}")
+        print(f"ADDED: employees.{col_name}")
+    except sqlite3.OperationalError as e:
+        if "duplicate column" in str(e).lower():
+            print(f"SKIP: employees.{col_name} already exists")
+        else:
+            print(f"ERROR: employees.{col_name} — {e}")
+
+conn.commit()
+conn.close()
+print("Done.")