v0.1.0: CRM/ERP 系统内测版本 - 安全加固完成

- Docker bridge 网络隔离（8000 端口封死）
- Gunicorn 4 Worker 多进程
- Alembic 数据库迁移基线
- 日志轮转 20m×3
- JWT 密钥 + DB 密码 + CORS 收紧
- 3-2-1 备份链路（NAS + R740-B 冷备）
- 连接池 pool_pre_ping + pool_recycle=3600

backend/_check_tables.py

@@ -0,0 +1,35 @@
+import psycopg2
+
+conn = psycopg2.connect(
+    host="192.168.1.85",
+    port=5432,
+    user="admin",
+    password="admin_password_2026",
+    dbname="lubrication_crm",
+)
+cur = conn.cursor()
+
+# Check table structures
+for t in ["users", "clients", "follow_ups", "expenses"]:
+    cur.execute(f"""
+        SELECT column_name, data_type, is_nullable, column_default
+        FROM information_schema.columns
+        WHERE table_name = '{t}'
+        ORDER BY ordinal_position
+    """)
+    print(f"\n=== {t} ===")
+    for row in cur.fetchall():
+        print(f"  {row[0]:20s} | {row[1]:20s} | null={row[2]} | default={row[3]}")
+
+    # Check constraints
+    cur.execute(f"""
+        SELECT conname, contype
+        FROM pg_constraint
+        JOIN pg_class ON conrelid = pg_class.oid
+        WHERE pg_class.relname = '{t}'
+    """)
+    constraints = cur.fetchall()
+    if constraints:
+        print(f"  Constraints: {constraints}")
+
+conn.close()