{
    "summary": [
        {
            "name": "pipeline_conversations",
            "title": "平台会话消息表（回放缓存）",
            "primary": ["id"],
            "catelog": "entity"
        }
    ],
    "fields": [
        {"name": "id", "title": "主键ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "pipeline_id", "title": "产线ID（空串=通用会话，隔离键）", "type": "str", "length": 32, "default": ""},
        {"name": "iteration_id", "title": "项目ID（历史语义名，存project_id）", "type": "str", "length": 32, "default": ""},
        {"name": "task_id", "title": "Pipeline任务ID（预留，当前零写入）", "type": "str", "length": 32, "default": ""},
        {"name": "step_name", "title": "关联步骤名（预留，当前零写入）", "type": "str", "length": 100, "default": ""},
        {"name": "role", "title": "消息角色", "type": "str", "length": 20, "nullable": "no", "default": "user"},
        {"name": "content", "title": "消息正文（回放缓存，4000字截断）", "type": "text"},
        {"name": "attachments", "title": "附件列表JSON（预留，当前零写入）", "type": "text"},
        {"name": "msg_type", "title": "消息类型", "type": "str", "length": 20, "default": "text"},
        {"name": "org_id", "title": "组织ID（预留，当前零写入）", "type": "str", "length": 32, "default": "0"},
        {"name": "created_by", "title": "创建人用户ID", "type": "str", "length": 32, "default": ""},
        {"name": "created_at", "title": "创建时间", "type": "timestamp", "nullable": "no"},
        {"name": "session_id", "title": "会话ID（多tab隔离键，m0003补列）", "type": "str", "length": 32, "default": ""}
    ],
    "indexes": [
        {"name": "idx_conv_created_by", "idxtype": "index", "idxfields": ["created_by"]},
        {"name": "idx_conv_session", "idxtype": "index", "idxfields": ["session_id"]},
        {"name": "idx_conv_iteration", "idxtype": "index", "idxfields": ["iteration_id"]},
        {"name": "idx_conv_created", "idxtype": "index", "idxfields": ["created_at"]}
    ]
}