【数据存储】关键双录：高危操作的前后留痕

-- 关键双录：操作前留痕
local player = class(actor)
local function preSnapshot(player, opType, opTarget)
    local snapId = "SNAP_" .. os.date("%Y%m%d%H%M%S") .. "_" .. math.random(100, 999)
    local before = "guild=" .. (getmyguild(player) or "") ..
        "|contrib=" .. (getplayvar(player, "HUMAN", "SectContrib") or 0) ..
        "|fund=" .. (getsysvar("GuildFund") or 0)
    setplayvar(player, "HUMAN", "SnapBefore_" .. snapId, before, true)
    setplayvar(player, "HUMAN", "SnapOp_" .. snapId, opType .. "|" .. opTarget, true)
    sendmsg(player, 1, 0, "操作前快照 " .. snapId .. " 已留存。")
    return snapId
end

-- 关键双录：结果快照与差异
local player = class(actor)
local function postSnapshot(player, snapId)
    local after = "guild=" .. (getmyguild(player) or "") ..
        "|contrib=" .. (getplayvar(player, "HUMAN", "SectContrib") or 0) ..
        "|fund=" .. (getsysvar("GuildFund") or 0)
    setplayvar(player, "HUMAN", "SnapAfter_" .. snapId, after, true)
    local before = getplayvar(player, "HUMAN", "SnapBefore_" .. snapId) or ""
    sendmsg(player, 1, 0, "操作前：" .. before)
    sendmsg(player, 1, 0, "操作后：" .. after)
end