【案例复盘】成就历史补发：漏发事件的追溯结算复盘

function migrateV1(actor)
    local player = class(actor)
    local old = getplayvar(actor, 2, "ACH_KILL")
    setplayvar(actor, "HUMAN", "ACH_SLAY", old, 1)
end

function migrateV2(actor)
    local player = class(actor)
    if getplayvar(actor, 2, "MIG_DONE") == 1 then
        return
    end
    local old = tonumber(getplayvar(actor, 2, "ACH_KILL") or "0")
    local cur = tonumber(getplayvar(actor, 2, "ACH_SLAY") or "0")
    if old > cur then
        setplayvar(actor, "HUMAN", "ACH_SLAY", old, 1)
    end
    setplayvar(actor, "HUMAN", "MIG_DONE", 1, 1)
end