【进阶实战】玩家排行榜赛季归档：过期榜的归档封装

local function archiveSeason(seasonId)
    local snapshot = {}
    for i, row in ipairs(currentRank) do
        snapshot[i] = { rank = i, name = row.name, score = row.score }
    end
    setsysvarex("Archive_" .. seasonId, os.time(), 1)
    local key = "RankData_" .. seasonId
    local serial = {}
    for _, s in ipairs(snapshot) do
        serial[#serial + 1] = s.rank .. "|" .. s.name .. "|" .. s.score
    end
    setsysvarex(key, table.concat(serial, ";"), 1)
    print("赛季 " .. seasonId .. " 归档完成")
end
local function queryArchive(seasonId)
    local data = getsysvar("RankData_" .. seasonId) or ""
    local rows = {}
    for r in string.gmatch(data, "[^;]+") do
        local rank, name, score = string.match(r, "^(%d+)|(.+)|(%d+)$")
        if rank then
            rows[#rows + 1] = { rank = tonumber(rank),
                name = name, score = tonumber(score) }
        end
    end
    return rows
end

local function cleanOldArchives(keepSeasons)
    local seasonId = tonumber(getsysvar("CurrentSeason")) or 1
    for i = 1, seasonId - keepSeasons do
        setsysvarex("RankData_" .. i, "", 1)
    end
end