【数据存储】变更日志：角色关键变更的流水留存

-- 变更日志：关键域流水
local player = class(actor)
local WATCHED = {level = true, gold = true, guild = true, equipcnt = true}
local function logChange(player, field, oldV, newV, source)
    if WATCHED[field] ~= true then return end
    if oldV == newV then return end
    local line = os.date("%Y%m%d%H%M%S") .. "|" .. field .. "|" ..
        oldV .. "|" .. newV .. "|" .. source
    setplayvar(player, "HUMAN", "Audit_" .. os.date("%Y%m%d"),
        (getplayvar(player, "HUMAN", "Audit_" .. os.date("%Y%m%d")) or "") .. line .. ";", true)
end

-- 审计查询：检索与异常标记
local player = class(actor)
local function auditQuery(player, day, field)
    local blob = getplayvar(player, "HUMAN", "Audit_" .. day) or ""
    local out = {}
    for line in string.gmatch(blob, "[^;]+") do
        local ts, f, oldV, newV, src = string.match(line, "([^|]+)|([^|]+)|([^|]+)|([^|]+)|(.+)")
        if f == field then
            local jump = tonumber(newV) and tonumber(oldV) and
                math.abs(tonumber(newV) - tonumber(oldV)) > 100
            out[#out + 1] = (jump and "【异常】" or "") .. ts .. " " .. oldV .. "→" .. newV .. "（" .. src .. "）"
        end
    end
    for i = 1, math.min(20, #out) do
        sendmsg(player, 1, 0, out[i])
    end
end