{
    "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": "所属世界", "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": 16, "nullable": "no", "default": "0"},
        {"name": "snapshot_json", "title": "快照数据JSON", "type": "text", "nullable": "no"},
        {"name": "status", "title": "状态", "type": "str", "length": 16, "nullable": "no", "default": "0"},
        {"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"]},
        {"name": "idx_snapshot_world_date", "idxtype": "index", "idxfields": ["world_id", "snapshot_date"]}
    ],
    "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'"}
    ]
}