【性能调优】数据库预热：开服前的热点数据加载

-- 数据库预热：热点加载
local player = class(actor)
local PRELOAD_LIST = {"rank_base", "shop_items", "guild_summary"}
local function preloadHotData(player)
    local done = 0
    for _, key in ipairs(PRELOAD_LIST) do
        if getsysvar("Preloaded_" .. key) ~= "1" then
            local data = loadFromDB(key)
            setsysvarex("Cache_" .. key, data, true)
            setsysvarex("Preloaded_" .. key, "1", true)
            done = done + 1
        end
    end
    sendmsg(player, 1, 0, "预热完成 " .. done .. "/" .. #PRELOAD_LIST .. " 项。")
end

-- 缓存刷新：定时同步
local player = class(actor)
local function refreshCache(player, key)
    local dbTs = tonumber(getsysvar("DbTs_" .. key) or 0)
    local cacheTs = tonumber(getsysvar("CacheTs_" .. key) or 0)
    if dbTs > cacheTs then
        local fresh = loadFromDB(key)
        setsysvarex("Cache_" .. key, fresh, true)
        setsysvarex("CacheTs_" .. key, dbTs, true)
        sendmsg(player, 1, 0, key .. " 缓存已刷新。")
    end
end