citu_vanna/citu_app.py

# 给dataops 对话助手返回结果
from vanna.flask import VannaFlaskApp
from vanna_llm_factory import create_vanna_instance
from flask import request, jsonify
import pandas as pd
import common.result as result
from datetime import datetime, timedelta
from common.session_aware_cache import SessionAwareMemoryCache

vn = create_vanna_instance()

# 创建带时间戳的缓存
timestamped_cache = SessionAwareMemoryCache()

# 实例化 VannaFlaskApp，使用自定义缓存
app = VannaFlaskApp(
    vn,
    cache=timestamped_cache,  # 使用带时间戳的缓存
    title="辞图智能数据问答平台",
    logo = "https://www.citupro.com/img/logo-black-2.png",
    subtitle="让 AI 为你写 SQL",
    chart=False,
    allow_llm_to_see_data=True,
    ask_results_correct=True,
    followup_questions=True,
    debug=True
)

# 修改ask接口，支持前端传递session_id
@app.flask_app.route('/api/v0/ask', methods=['POST'])
def ask_full():
    req = request.get_json(force=True)
    question = req.get("question", None)
    browser_session_id = req.get("session_id", None)  # 前端传递的会话ID
    
    if not question:
        return jsonify(result.failed(message="未提供问题", code=400)), 400

    # 如果使用WebSessionAwareMemoryCache
    if hasattr(app.cache, 'generate_id_with_browser_session') and browser_session_id:
        # 这里需要修改vanna的ask方法来支持传递session_id
        # 或者预先调用generate_id来建立会话关联
        conversation_id = app.cache.generate_id_with_browser_session(
            question=question, 
            browser_session_id=browser_session_id
        )

    try:
        sql, df, fig = vn.ask(
            question=question,
            print_results=False,
            visualize=False,
            allow_llm_to_see_data=True
        )

        rows, columns = [], []
        summary = None
        
        if isinstance(df, pd.DataFrame) and not df.empty:
            rows = df.head(1000).to_dict(orient="records")
            columns = list(df.columns)
            
            # 生成数据摘要
            try:
                summary = vn.generate_summary(question=question, df=df)
                print(f"[INFO] 成功生成摘要: {summary}")
            except Exception as e:
                print(f"[WARNING] 生成摘要失败: {str(e)}")
                summary = None

        return jsonify(result.success(data={
            "sql": sql,
            "rows": rows,
            "columns": columns,
            "summary": summary,  # 添加摘要到返回结果
            "conversation_id": conversation_id if 'conversation_id' in locals() else None,
            "session_id": browser_session_id
        }))
        
    except Exception as e:
        print(f"[ERROR] ask_full执行失败: {str(e)}")
        return jsonify(result.failed(
            message=f"查询处理失败: {str(e)}", 
            code=500
        )), 500


@app.flask_app.route('/api/v1/citu_train_question_sql', methods=['POST'])
def citu_train_question_sql():
    try:
        req = request.get_json(force=True)
        question = req.get('question')
        sql = req.get('sql')
        
        if not sql:
            return jsonify(result.failed(
                message="'sql' are required", 
                code=400
            )), 400
        
        # 正确的调用方式：同时传递question和sql
        if question:
            training_id = vn.train(question=question, sql=sql)
            print(f"训练成功，训练ID为：{training_id}，问题：{question}，SQL：{sql}")
        else:
            training_id = vn.train(sql=sql)
            print(f"训练成功，训练ID为：{training_id}，SQL：{sql}")

        return jsonify(result.success(data={
            "training_id": training_id,
            "message": "Question-SQL pair trained successfully"
        }))
        
    except Exception as e:
        return jsonify(result.failed(
            message=f"Training failed: {str(e)}", 
            code=500
        )), 500


# ==================== 日常管理API ====================

@app.flask_app.route('/api/v0/cache_overview', methods=['GET'])
def cache_overview():
    """日常管理：轻量概览 - 合并原cache_inspect的核心功能"""
    try:
        cache = app.cache
        result_data = {
            'overview_summary': {
                'total_conversations': 0,
                'total_sessions': 0,
                'query_time': datetime.now().isoformat()
            },
            'recent_conversations': [],  # 最近的对话
            'session_summary': []       # 会话摘要
        }
        
        if hasattr(cache, 'cache') and isinstance(cache.cache, dict):
            result_data['overview_summary']['total_conversations'] = len(cache.cache)
            
            # 获取会话信息
            if hasattr(cache, 'get_all_sessions'):
                all_sessions = cache.get_all_sessions()
                result_data['overview_summary']['total_sessions'] = len(all_sessions)
                
                # 会话摘要（按最近活动排序）
                session_list = []
                for session_id, session_data in all_sessions.items():
                    session_summary = {
                        'session_id': session_id,
                        'start_time': session_data['start_time'].isoformat(),
                        'conversation_count': session_data.get('conversation_count', 0),
                        'duration_seconds': session_data.get('session_duration_seconds', 0),
                        'last_activity': session_data.get('last_activity', session_data['start_time']).isoformat(),
                        'is_active': (datetime.now() - session_data.get('last_activity', session_data['start_time'])).total_seconds() < 1800  # 30分钟内活跃
                    }
                    session_list.append(session_summary)
                
                # 按最后活动时间排序
                session_list.sort(key=lambda x: x['last_activity'], reverse=True)
                result_data['session_summary'] = session_list
            
            # 最近的对话（最多显示10个）
            conversation_list = []
            for conversation_id, conversation_data in cache.cache.items():
                conversation_start_time = cache.conversation_start_times.get(conversation_id)
                
                conversation_info = {
                    'conversation_id': conversation_id,
                    'conversation_start_time': conversation_start_time.isoformat() if conversation_start_time else None,
                    'session_id': cache.conversation_to_session.get(conversation_id),
                    'has_question': 'question' in conversation_data,
                    'has_sql': 'sql' in conversation_data,
                    'has_data': 'df' in conversation_data and conversation_data['df'] is not None,
                    'question_preview': conversation_data.get('question', '')[:80] + '...' if len(conversation_data.get('question', '')) > 80 else conversation_data.get('question', ''),
                }
                
                # 计算对话持续时间
                if conversation_start_time:
                    duration = datetime.now() - conversation_start_time
                    conversation_info['conversation_duration_seconds'] = duration.total_seconds()
                
                conversation_list.append(conversation_info)
            
            # 按对话开始时间排序，显示最新的10个
            conversation_list.sort(key=lambda x: x['conversation_start_time'] or '', reverse=True)
            result_data['recent_conversations'] = conversation_list[:10]
        
        return jsonify(result.success(data=result_data))
        
    except Exception as e:
        return jsonify(result.failed(
            message=f"获取缓存概览失败: {str(e)}", 
            code=500
        )), 500


@app.flask_app.route('/api/v0/cache_stats', methods=['GET'])
def cache_stats():
    """日常管理：统计信息 - 合并原session_stats和cache_stats功能"""
    try:
        cache = app.cache
        current_time = datetime.now()
        
        stats = {
            'basic_stats': {
                'total_sessions': len(getattr(cache, 'session_info', {})),
                'total_conversations': len(getattr(cache, 'cache', {})),
                'active_sessions': 0,  # 最近30分钟有活动
                'average_conversations_per_session': 0
            },
            'time_distribution': {
                'sessions': {
                    'last_1_hour': 0,
                    'last_6_hours': 0, 
                    'last_24_hours': 0,
                    'last_7_days': 0,
                    'older': 0
                },
                'conversations': {
                    'last_1_hour': 0,
                    'last_6_hours': 0,
                    'last_24_hours': 0, 
                    'last_7_days': 0,
                    'older': 0
                }
            },
            'session_details': [],
            'time_ranges': {
                'oldest_session': None,
                'newest_session': None,
                'oldest_conversation': None,
                'newest_conversation': None
            }
        }
        
        # 会话统计
        if hasattr(cache, 'session_info'):
            session_times = []
            total_conversations = 0
            
            for session_id, session_data in cache.session_info.items():
                start_time = session_data['start_time']
                session_times.append(start_time)
                conversation_count = len(session_data.get('conversations', []))
                total_conversations += conversation_count
                
                # 检查活跃状态
                last_activity = session_data.get('last_activity', session_data['start_time'])
                if (current_time - last_activity).total_seconds() < 1800:
                    stats['basic_stats']['active_sessions'] += 1
                
                # 时间分布统计
                age_hours = (current_time - start_time).total_seconds() / 3600
                if age_hours <= 1:
                    stats['time_distribution']['sessions']['last_1_hour'] += 1
                elif age_hours <= 6:
                    stats['time_distribution']['sessions']['last_6_hours'] += 1
                elif age_hours <= 24:
                    stats['time_distribution']['sessions']['last_24_hours'] += 1
                elif age_hours <= 168:  # 7 days
                    stats['time_distribution']['sessions']['last_7_days'] += 1
                else:
                    stats['time_distribution']['sessions']['older'] += 1
                
                # 会话详细信息
                session_duration = current_time - start_time
                stats['session_details'].append({
                    'session_id': session_id,
                    'start_time': start_time.isoformat(),
                    'last_activity': last_activity.isoformat(),
                    'conversation_count': conversation_count,
                    'duration_seconds': session_duration.total_seconds(),
                    'duration_formatted': str(session_duration),
                    'is_active': (current_time - last_activity).total_seconds() < 1800,
                    'browser_session_id': session_data.get('browser_session_id')
                })
            
            # 计算平均值
            if len(cache.session_info) > 0:
                stats['basic_stats']['average_conversations_per_session'] = total_conversations / len(cache.session_info)
            
            # 时间范围
            if session_times:
                stats['time_ranges']['oldest_session'] = min(session_times).isoformat()
                stats['time_ranges']['newest_session'] = max(session_times).isoformat()
        
        # 对话统计
        if hasattr(cache, 'conversation_start_times'):
            conversation_times = []
            for conv_time in cache.conversation_start_times.values():
                conversation_times.append(conv_time)
                age_hours = (current_time - conv_time).total_seconds() / 3600
                
                if age_hours <= 1:
                    stats['time_distribution']['conversations']['last_1_hour'] += 1
                elif age_hours <= 6:
                    stats['time_distribution']['conversations']['last_6_hours'] += 1
                elif age_hours <= 24:
                    stats['time_distribution']['conversations']['last_24_hours'] += 1
                elif age_hours <= 168:
                    stats['time_distribution']['conversations']['last_7_days'] += 1
                else:
                    stats['time_distribution']['conversations']['older'] += 1
            
            if conversation_times:
                stats['time_ranges']['oldest_conversation'] = min(conversation_times).isoformat()
                stats['time_ranges']['newest_conversation'] = max(conversation_times).isoformat()
        
        # 按最近活动排序会话详情
        stats['session_details'].sort(key=lambda x: x['last_activity'], reverse=True)
        
        return jsonify(result.success(data=stats))
        
    except Exception as e:
        return jsonify(result.failed(
            message=f"获取缓存统计失败: {str(e)}", 
            code=500
        )), 500


# ==================== 高级功能API ====================

@app.flask_app.route('/api/v0/cache_export', methods=['GET'])
def cache_export():
    """高级功能：完整导出 - 保持原cache_raw_export的完整功能"""
    try:
        cache = app.cache
        
        # 验证缓存的实际结构
        if not hasattr(cache, 'cache'):
            return jsonify(result.failed(message="缓存对象没有cache属性", code=500)), 500
        
        if not isinstance(cache.cache, dict):
            return jsonify(result.failed(message="缓存不是字典类型", code=500)), 500
        
        # 定义JSON序列化辅助函数
        def make_json_serializable(obj):
            """将对象转换为JSON可序列化的格式"""
            if obj is None:
                return None
            elif isinstance(obj, (str, int, float, bool)):
                return obj
            elif isinstance(obj, (list, tuple)):
                return [make_json_serializable(item) for item in obj]
            elif isinstance(obj, dict):
                return {str(k): make_json_serializable(v) for k, v in obj.items()}
            elif hasattr(obj, 'isoformat'):  # datetime objects
                return obj.isoformat()
            elif hasattr(obj, 'item'):  # numpy scalars
                return obj.item()
            elif hasattr(obj, 'tolist'):  # numpy arrays
                return obj.tolist()
            elif hasattr(obj, '__dict__'):  # pandas dtypes and other objects
                return str(obj)
            else:
                return str(obj)
        
        # 获取完整的原始缓存数据
        raw_cache = cache.cache
        
        # 获取会话和对话时间信息
        conversation_times = getattr(cache, 'conversation_start_times', {})
        session_info = getattr(cache, 'session_info', {})
        conversation_to_session = getattr(cache, 'conversation_to_session', {})
        
        export_data = {
            'export_metadata': {
                'export_time': datetime.now().isoformat(),
                'total_conversations': len(raw_cache),
                'total_sessions': len(session_info),
                'cache_type': type(cache).__name__,
                'cache_object_info': str(cache),
                'has_session_times': bool(session_info),
                'has_conversation_times': bool(conversation_times)
            },
            'session_info': {
                session_id: {
                    'start_time': session_data['start_time'].isoformat(),
                    'last_activity': session_data.get('last_activity', session_data['start_time']).isoformat(),
                    'conversations': session_data['conversations'],
                    'conversation_count': len(session_data['conversations']),
                    'browser_session_id': session_data.get('browser_session_id'),
                    'user_info': session_data.get('user_info', {})
                }
                for session_id, session_data in session_info.items()
            },
            'conversation_times': {
                conversation_id: start_time.isoformat() 
                for conversation_id, start_time in conversation_times.items()
            },
            'conversation_to_session_mapping': conversation_to_session,
            'conversations': {}
        }
        
        # 处理每个对话的完整数据
        for conversation_id, conversation_data in raw_cache.items():
            # 获取时间信息
            conversation_start_time = conversation_times.get(conversation_id)
            session_id = conversation_to_session.get(conversation_id)
            session_start_time = None
            if session_id and session_id in session_info:
                session_start_time = session_info[session_id]['start_time']
            
            processed_conversation = {
                'conversation_id': conversation_id,
                'conversation_start_time': conversation_start_time.isoformat() if conversation_start_time else None,
                'session_id': session_id,
                'session_start_time': session_start_time.isoformat() if session_start_time else None,
                'field_count': len(conversation_data),
                'fields': {}
            }
            
            # 添加时间计算
            if conversation_start_time:
                conversation_duration = datetime.now() - conversation_start_time
                processed_conversation['conversation_duration_seconds'] = conversation_duration.total_seconds()
                processed_conversation['conversation_duration_formatted'] = str(conversation_duration)
            
            if session_start_time:
                session_duration = datetime.now() - session_start_time
                processed_conversation['session_duration_seconds'] = session_duration.total_seconds()
                processed_conversation['session_duration_formatted'] = str(session_duration)
            
            # 处理每个字段，确保JSON序列化安全
            for field_name, field_value in conversation_data.items():
                field_info = {
                    'field_name': field_name,
                    'data_type': type(field_value).__name__,
                    'is_none': field_value is None
                }
                
                try:
                    if field_value is None:
                        field_info['value'] = None
                        
                    elif field_name in ['conversation_start_time', 'session_start_time']:
                        # 处理时间字段
                        field_info['content'] = make_json_serializable(field_value)
                        
                    elif field_name == 'df' and field_value is not None:
                        # DataFrame的安全处理
                        if hasattr(field_value, 'to_dict'):
                            # 安全地处理dtypes
                            try:
                                dtypes_dict = {}
                                for col, dtype in field_value.dtypes.items():
                                    dtypes_dict[col] = str(dtype)
                            except Exception:
                                dtypes_dict = {"error": "无法序列化dtypes"}
                            
                            # 安全地处理内存使用
                            try:
                                memory_usage = field_value.memory_usage(deep=True)
                                memory_dict = {}
                                for idx, usage in memory_usage.items():
                                    memory_dict[str(idx)] = int(usage) if hasattr(usage, 'item') else int(usage)
                            except Exception:
                                memory_dict = {"error": "无法获取内存使用信息"}
                            
                            field_info.update({
                                'dataframe_info': {
                                    'shape': list(field_value.shape),
                                    'columns': list(field_value.columns),
                                    'dtypes': dtypes_dict,
                                    'index_info': {
                                        'type': type(field_value.index).__name__,
                                        'length': len(field_value.index)
                                    }
                                },
                                'data': make_json_serializable(field_value.to_dict('records')),
                                'memory_usage': memory_dict
                            })
                        else:
                            field_info['value'] = str(field_value)
                            field_info['note'] = 'not_standard_dataframe'
                    
                    elif field_name == 'fig_json':
                        # 图表JSON数据处理
                        if isinstance(field_value, str):
                            try:
                                import json
                                parsed_fig = json.loads(field_value)
                                field_info.update({
                                    'json_valid': True,
                                    'json_size_bytes': len(field_value),
                                    'plotly_structure': {
                                        'has_data': 'data' in parsed_fig,
                                        'has_layout': 'layout' in parsed_fig,
                                        'data_traces_count': len(parsed_fig.get('data', [])),
                                    },
                                    'raw_json': field_value
                                })
                            except json.JSONDecodeError:
                                field_info.update({
                                    'json_valid': False,
                                    'raw_content': str(field_value)
                                })
                        else:
                            field_info['value'] = make_json_serializable(field_value)
                    
                    elif field_name == 'followup_questions':
                        # 后续问题列表
                        field_info.update({
                            'content': make_json_serializable(field_value)
                        })
                    
                    elif field_name in ['question', 'sql', 'summary']:
                        # 文本字段
                        if isinstance(field_value, str):
                            field_info.update({
                                'text_length': len(field_value),
                                'content': field_value
                            })
                        else:
                            field_info['value'] = make_json_serializable(field_value)
                    
                    else:
                        # 未知字段的安全处理
                        field_info['content'] = make_json_serializable(field_value)
                
                except Exception as e:
                    field_info.update({
                        'processing_error': str(e),
                        'fallback_value': str(field_value)[:500] + '...' if len(str(field_value)) > 500 else str(field_value)
                    })
                
                processed_conversation['fields'][field_name] = field_info
            
            export_data['conversations'][conversation_id] = processed_conversation
        
        # 添加缓存统计信息
        field_frequency = {}
        data_types_found = set()
        total_dataframes = 0
        total_questions = 0
        
        for conv_data in export_data['conversations'].values():
            for field_name, field_info in conv_data['fields'].items():
                field_frequency[field_name] = field_frequency.get(field_name, 0) + 1
                data_types_found.add(field_info['data_type'])
                
                if field_name == 'df' and not field_info['is_none']:
                    total_dataframes += 1
                if field_name == 'question' and not field_info['is_none']:
                    total_questions += 1
        
        export_data['cache_statistics'] = {
            'field_frequency': field_frequency,
            'data_types_found': list(data_types_found),
            'total_dataframes': total_dataframes,
            'total_questions': total_questions,
            'has_session_timing': 'session_start_time' in field_frequency,
            'has_conversation_timing': 'conversation_start_time' in field_frequency
        }
        
        return jsonify(result.success(data=export_data))
        
    except Exception as e:
        import traceback
        error_details = {
            'error_message': str(e),
            'error_type': type(e).__name__,
            'traceback': traceback.format_exc()
        }
        return jsonify(result.failed(
            message=f"导出缓存失败: {str(e)}", 
            code=500,
            data=error_details
        )), 500


# ==================== 清理功能API ====================

@app.flask_app.route('/api/v0/cache_preview_cleanup', methods=['POST'])
def cache_preview_cleanup():
    """清理功能：预览删除操作 - 保持原功能"""
    try:
        req = request.get_json(force=True)
        
        # 时间条件 - 支持三种方式
        older_than_hours = req.get('older_than_hours')
        older_than_days = req.get('older_than_days') 
        before_timestamp = req.get('before_timestamp')  # YYYY-MM-DD HH:MM:SS 格式
        
        cache = app.cache
        
        # 计算截止时间
        cutoff_time = None
        time_condition = None
        
        if older_than_hours:
            cutoff_time = datetime.now() - timedelta(hours=older_than_hours)
            time_condition = f"older_than_hours: {older_than_hours}"
        elif older_than_days:
            cutoff_time = datetime.now() - timedelta(days=older_than_days)
            time_condition = f"older_than_days: {older_than_days}"
        elif before_timestamp:
            try:
                # 支持 YYYY-MM-DD HH:MM:SS 格式
                cutoff_time = datetime.strptime(before_timestamp, '%Y-%m-%d %H:%M:%S')
                time_condition = f"before_timestamp: {before_timestamp}"
            except ValueError:
                return jsonify(result.failed(
                    message="before_timestamp格式错误，请使用 YYYY-MM-DD HH:MM:SS 格式", 
                    code=400
                )), 400
        else:
            return jsonify(result.failed(
                message="必须提供时间条件：older_than_hours, older_than_days 或 before_timestamp (YYYY-MM-DD HH:MM:SS)", 
                code=400
            )), 400
        
        preview = {
            'time_condition': time_condition,
            'cutoff_time': cutoff_time.isoformat(),
            'will_be_removed': {
                'sessions': []
            },
            'will_be_kept': {
                'sessions_count': 0,
                'conversations_count': 0
            },
            'summary': {
                'sessions_to_remove': 0,
                'conversations_to_remove': 0,
                'sessions_to_keep': 0,
                'conversations_to_keep': 0
            }
        }
        
        # 预览按session删除
        sessions_to_remove_count = 0
        conversations_to_remove_count = 0
        
        for session_id, session_data in cache.session_info.items():
            session_preview = {
                'session_id': session_id,
                'start_time': session_data['start_time'].isoformat(),
                'conversation_count': len(session_data['conversations']),
                'conversations': []
            }
            
            # 添加conversation详情
            for conv_id in session_data['conversations']:
                if conv_id in cache.cache:
                    conv_data = cache.cache[conv_id]
                    session_preview['conversations'].append({
                        'conversation_id': conv_id,
                        'question': conv_data.get('question', '')[:50] + '...' if conv_data.get('question') else '',
                        'start_time': cache.conversation_start_times.get(conv_id, '').isoformat() if cache.conversation_start_times.get(conv_id) else ''
                    })
            
            if session_data['start_time'] < cutoff_time:
                preview['will_be_removed']['sessions'].append(session_preview)
                sessions_to_remove_count += 1
                conversations_to_remove_count += len(session_data['conversations'])
            else:
                preview['will_be_kept']['sessions_count'] += 1
                preview['will_be_kept']['conversations_count'] += len(session_data['conversations'])
        
        # 更新摘要统计
        preview['summary'] = {
            'sessions_to_remove': sessions_to_remove_count,
            'conversations_to_remove': conversations_to_remove_count,
            'sessions_to_keep': preview['will_be_kept']['sessions_count'],
            'conversations_to_keep': preview['will_be_kept']['conversations_count']
        }
        
        return jsonify(result.success(data=preview))
        
    except Exception as e:
        return jsonify(result.failed(
            message=f"预览清理操作失败: {str(e)}", 
            code=500
        )), 500


@app.flask_app.route('/api/v0/cache_cleanup', methods=['POST'])
def cache_cleanup():
    """清理功能：实际删除缓存 - 保持原功能"""
    try:
        req = request.get_json(force=True)
        
        # 时间条件 - 支持三种方式
        older_than_hours = req.get('older_than_hours')
        older_than_days = req.get('older_than_days') 
        before_timestamp = req.get('before_timestamp')  # YYYY-MM-DD HH:MM:SS 格式
        
        cache = app.cache
        
        if not hasattr(cache, 'session_info'):
            return jsonify(result.failed(
                message="缓存不支持会话功能", 
                code=400
            )), 400
        
        # 计算截止时间
        cutoff_time = None
        time_condition = None
        
        if older_than_hours:
            cutoff_time = datetime.now() - timedelta(hours=older_than_hours)
            time_condition = f"older_than_hours: {older_than_hours}"
        elif older_than_days:
            cutoff_time = datetime.now() - timedelta(days=older_than_days)
            time_condition = f"older_than_days: {older_than_days}"
        elif before_timestamp:
            try:
                # 支持 YYYY-MM-DD HH:MM:SS 格式
                cutoff_time = datetime.strptime(before_timestamp, '%Y-%m-%d %H:%M:%S')
                time_condition = f"before_timestamp: {before_timestamp}"
            except ValueError:
                return jsonify(result.failed(
                    message="before_timestamp格式错误，请使用 YYYY-MM-DD HH:MM:SS 格式", 
                    code=400
                )), 400
        else:
            return jsonify(result.failed(
                message="必须提供时间条件：older_than_hours, older_than_days 或 before_timestamp (YYYY-MM-DD HH:MM:SS)", 
                code=400
            )), 400
        
        cleanup_stats = {
            'time_condition': time_condition,
            'cutoff_time': cutoff_time.isoformat(),
            'sessions_removed': 0,
            'conversations_removed': 0,
            'sessions_kept': 0,
            'conversations_kept': 0,
            'removed_session_ids': [],
            'removed_conversation_ids': []
        }
        
        # 按session删除
        sessions_to_remove = []
        
        for session_id, session_data in cache.session_info.items():
            if session_data['start_time'] < cutoff_time:
                sessions_to_remove.append(session_id)
        
        # 删除符合条件的sessions及其所有conversations
        for session_id in sessions_to_remove:
            session_data = cache.session_info[session_id]
            conversations_in_session = session_data['conversations'].copy()
            
            # 删除session中的所有conversations
            for conv_id in conversations_in_session:
                if conv_id in cache.cache:
                    del cache.cache[conv_id]
                    cleanup_stats['conversations_removed'] += 1
                    cleanup_stats['removed_conversation_ids'].append(conv_id)
                
                # 清理conversation相关的时间记录
                if hasattr(cache, 'conversation_start_times') and conv_id in cache.conversation_start_times:
                    del cache.conversation_start_times[conv_id]
                
                if hasattr(cache, 'conversation_to_session') and conv_id in cache.conversation_to_session:
                    del cache.conversation_to_session[conv_id]
            
            # 删除session记录
            del cache.session_info[session_id]
            cleanup_stats['sessions_removed'] += 1
            cleanup_stats['removed_session_ids'].append(session_id)
        
        # 统计保留的sessions和conversations
        cleanup_stats['sessions_kept'] = len(cache.session_info)
        cleanup_stats['conversations_kept'] = len(cache.cache)
        
        return jsonify(result.success(data=cleanup_stats))
        
    except Exception as e:
        return jsonify(result.failed(
            message=f"清理缓存失败: {str(e)}", 
            code=500
        )), 500



# 前端JavaScript示例 - 如何维持会话
"""
// 前端需要维护一个会话ID
class ChatSession {
    constructor() {
        // 从localStorage获取或创建新的会话ID
        this.sessionId = localStorage.getItem('chat_session_id') || this.generateSessionId();
        localStorage.setItem('chat_session_id', this.sessionId);
    }
    
    generateSessionId() {
        return 'session_' + Date.now() + '_' + Math.random().toString(36).substr(2, 9);
    }
    
    async askQuestion(question) {
        const response = await fetch('/api/v0/ask', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({
                question: question,
                session_id: this.sessionId  // 关键：传递会话ID
            })
        });
        return await response.json();
    }
    
    // 开始新会话
    startNewSession() {
        this.sessionId = this.generateSessionId();
        localStorage.setItem('chat_session_id', this.sessionId);
    }
}

// 使用示例
const chatSession = new ChatSession();
chatSession.askQuestion("各年龄段客户的流失率如何？");
"""
    

print("正在启动Flask应用: http://localhost:8084")
app.run(host="0.0.0.0", port=8084, debug=True)