feat: 数据库架构优化 v1.3.0

- 恢复MySQL主数据库配置，SQLite作为备份系统
- 修复工单详情API的数据库会话管理问题
- 新增备份管理系统(backup_manager.py)
- 添加备份管理API接口(/api/backup/*)
- 更新系统架构图和版本信息
- 完善README文档和更新日志

主要改进:
- MySQL作为主数据库存储所有业务数据
- SQLite文件作为数据备份和恢复使用
- 自动备份MySQL数据到SQLite文件
- 支持数据恢复和备份状态监控

src/web/app.py

@@ -29,7 +29,8 @@ from src.analytics.alert_system import AlertRule, AlertLevel, AlertType
 from src.dialogue.realtime_chat import RealtimeChatManager
 from src.vehicle.vehicle_data_manager import VehicleDataManager
 from src.core.database import db_manager
-from src.core.models import WorkOrder, Alert, Conversation, KnowledgeEntry, WorkOrderSuggestion
+from src.core.models import WorkOrder, Alert, Conversation, KnowledgeEntry, WorkOrderSuggestion, VehicleData
+from src.core.backup_manager import backup_manager
 
 app = Flask(__name__)
 CORS(app)
@@ -691,7 +692,8 @@ def get_workorder_details(workorder_id):
                     "assistant_response": c.assistant_response,
                     "timestamp": c.timestamp.isoformat() if c.timestamp else None
                 })
-        workorder = {
+            # 在会话内构建工单数据
+            workorder = {
                 "id": w.id,
                 "order_id": w.order_id,
                 "title": w.title,
@@ -704,8 +706,8 @@ def get_workorder_details(workorder_id):
                 "resolution": w.resolution,
                 "satisfaction_score": w.satisfaction_score,
                 "conversations": conv_list
-        }
-        return jsonify(workorder)
+            }
+            return jsonify(workorder)
     except Exception as e:
         return jsonify({"error": str(e)}), 500
 
@@ -1339,6 +1341,80 @@ def test_model_response():
     except Exception as e:
         return jsonify({"success": False, "error": str(e)}), 500
 
+# 数据库备份管理API
+@app.route('/api/backup/info')
+def get_backup_info():
+    """获取备份信息"""
+    try:
+        info = backup_manager.get_backup_info()
+        return jsonify({
+            "success": True,
+            "backup_info": info
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/backup/create', methods=['POST'])
+def create_backup():
+    """创建数据备份"""
+    try:
+        result = backup_manager.backup_all_data()
+        return jsonify({
+            "success": result["success"],
+            "message": "备份创建成功" if result["success"] else "备份创建失败",
+            "backup_result": result
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/backup/restore', methods=['POST'])
+def restore_backup():
+    """从备份恢复数据"""
+    try:
+        data = request.get_json() or {}
+        table_name = data.get('table_name')  # 可选：指定恢复特定表
+        
+        result = backup_manager.restore_from_backup(table_name)
+        return jsonify({
+            "success": result["success"],
+            "message": "数据恢复成功" if result["success"] else "数据恢复失败",
+            "restore_result": result
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
+@app.route('/api/database/status')
+def get_database_status():
+    """获取数据库状态信息"""
+    try:
+        # MySQL数据库状态
+        mysql_status = {
+            "type": "MySQL",
+            "url": str(db_manager.engine.url).replace(db_manager.engine.url.password, "******") if db_manager.engine.url.password else str(db_manager.engine.url),
+            "connected": db_manager.test_connection()
+        }
+        
+        # 统计MySQL数据
+        with db_manager.get_session() as session:
+            mysql_status["table_counts"] = {
+                "work_orders": session.query(WorkOrder).count(),
+                "conversations": session.query(Conversation).count(),
+                "knowledge_entries": session.query(KnowledgeEntry).count(),
+                "vehicle_data": session.query(VehicleData).count(),
+                "alerts": session.query(Alert).count()
+            }
+        
+        # SQLite备份状态
+        backup_info = backup_manager.get_backup_info()
+        
+        return jsonify({
+            "success": True,
+            "mysql": mysql_status,
+            "sqlite_backup": backup_info
+        })
+    except Exception as e:
+        return jsonify({"error": str(e)}), 500
+
 if __name__ == '__main__':
     import time
     app.config['START_TIME'] = time.time()