{
    "summary": [
        {
            "name": "usage_logs",
            "title": "用量日志",
            "primary": ["id"]
        }
    ],
    "fields": [
        {"name": "id", "title": "ID", "type": "str", "length": 32},
        {"name": "org_id", "title": "机构ID", "type": "str", "length": 32},
        {"name": "kb_id", "title": "知识库ID", "type": "str", "length": 32},
        {"name": "operation", "title": "操作类型", "type": "str", "length": 32},
        {"name": "bytes_delta", "title": "磁盘变化(字节)", "type": "int", "default": 0},
        {"name": "bytes_total", "title": "累计磁盘", "type": "int", "default": 0},
        {"name": "api_calls", "title": "API调用数", "type": "int", "default": 1},
        {"name": "engine_type", "title": "引擎类型", "type": "str", "length": 32},
        {"name": "tokens_used", "title": "Token消耗", "type": "int", "default": 0},
        {"name": "cost_estimate", "title": "预估费用", "type": "float", "dec": 4},
        {"name": "detail", "title": "详情JSON", "type": "text", "length": 2000},
        {"name": "created_at", "title": "创建时间", "type": "datetime"}
    ],
    "codes": [
        {"field": "operation", "table": "appcodes_kv", "valuefield": "k", "textfield": "v", "cond": "parentid='usage_op'"}
    ],
    "indexes": [
        {"name": "idx_usage_org", "idxtype": "index", "idxfields": ["org_id", "created_at"]},
        {"name": "idx_usage_kb", "idxtype": "index", "idxfields": ["kb_id"]}
    ]
}