【入门夯实】数据寿命：各类数据的保留周期表

local function purgeOld(ts)
    if ts < os.time() - 30 * 86400 then
        delete(ts)
    end
end

local LIFE = {
    chat = 30,
    trade = 180,
    login = 30,
    auction = 365,
}
local function isExpired(kind, ts)
    local days = LIFE[kind]
    if days == nil then
        return false
    end
    return ts < os.time() - days * 86400
end
local function purge(kind, rows)
    local removed = 0
    for i = #rows, 1, -1 do
        if isExpired(kind, rows[i].ts) then
            table.remove(rows, i)
            removed = removed + 1
        end
    end
    return removed
end

local gone = purge("trade", tradeRows)
sendmsg(nil, 1, "过期交易流水清理 " .. gone .. " 条")

local frozen = {}
local function isProtected(kind, id)
    return frozen[kind .. "_" .. id] == true
end