{
  "summary": [
    {"pkey": "id", "caption": "演示会话表", "tablename": "demo_session", "module": "demo"}
  ],
  "fields": [
    {"name": "id", "type": "str(64)", "comment": "会话ID"},
    {"name": "world_id", "type": "str(64)", "comment": "世界ID(W-01 world.id)"},
    {"name": "session_name", "type": "str(128)", "comment": "演示名称"},
    {"name": "status", "type": "str(16)", "comment": "preview=演示中 paused=已暂停 ended=已结束"},
    {"name": "camera_mode", "type": "str(16)", "comment": "视角模式 orbit/topdown/firstperson"},
    {"name": "owner_id", "type": "str(32)", "comment": "演示发起人"},
    {"name": "viewer_count", "type": "int", "comment": "在线观看人数"},
    {"name": "extra_json", "type": "text", "comment": "扩展JSON(全屏等)"},
    {"name": "created_at", "type": "datetime", "comment": "创建时间"},
    {"name": "updated_at", "type": "datetime", "comment": "更新时间"}
  ],
  "indexes": [
    {"name": "idx_demo_session_world", "fields": ["world_id"]},
    {"name": "idx_demo_session_status", "fields": ["status"]}
  ],
  "codes": []
}