【数据存储】日志分级存储：核心日志与调试日志

---日志的分级写入
local LOG_LEVELS = { core = "core_logs", debug = "debug_logs", perf = "perf_logs" }
function Log.write(level, kind, data)
    local target = LOG_LEVELS[level]
    if target then
        QF_AppendLog(target, { kind = kind, data = data, at = os.time() })
    end
end

-- 核心日志：永久保留
Log.write("core", "trade", { orderId = "xxx", amount = 1000 })

-- 调试日志：7 天自动清理
Log.write("debug", "perf_sample", { fps = 58, memory = 120 })

---日志的分级查询
function LogQuery.search(level, kind, timeRange)
    local results = {}
    for _, row in ipairs(QF_LoadLogs(level, timeRange)) do
        if not kind or row.kind == kind then
            results[#results + 1] = row
        end
    end
    return results
end