{
    "summary": [
        {
            "name": "world_snapshot",
            "title": "世界快照表",
            "primary": ["id"],
            "catelog": "entity"
        }
    ],
    "fields": [
        {"name": "id", "title": "主键ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "world_id", "title": "世界ID", "type": "str", "length": 32, "nullable": "no"},
        {"name": "name", "title": "快照名称", "type": "str", "length": 255, "nullable": "no"},
        {"name": "snapshot_type", "title": "快照类型", "type": "str", "length": 32, "nullable": "no", "default": "full"},
        {"name": "snapshot_json", "title": "快照内容", "type": "text"},
        {"name": "status", "title": "快照状态", "type": "str", "length": 32, "nullable": "no", "default": "active"},
        {"name": "snapshot_date", "title": "快照日期", "type": "date", "nullable": "no"},
        {"name": "created_at", "title": "创建时间", "type": "timestamp", "nullable": "no"}
    ],
    "indexes": [
        {"name": "idx_snapshot_world", "idxtype": "index", "idxfields": ["world_id", "snapshot_date"]},
        {"name": "idx_snapshot_list", "idxtype": "index", "idxfields": ["world_id", "status", "created_at"]}
    ],
    "codes": [
        {"field": "world_id", "table": "world", "valuefield": "id", "textfield": "name"},
        {"field": "snapshot_type", "table": "appcodes_kv", "valuefield": "k", "textfield": "v", "cond": "parentid='snapshot_type'"},
        {"field": "status", "table": "appcodes_kv", "valuefield": "k", "textfield": "v", "cond": "parentid='snapshot_status'"}
    ]
}