【数据存储】存档键版本迁移：双读双写的灰度切换方案

local KEY_MAP = { PK_VALUE = "PKVAL", MASTER = "MASTER_NAME" }
local function writeBoth(actor, oldKey, val)
    local player = class(actor)
    local newKey = KEY_MAP[oldKey] or oldKey
    setplayvar(actor, "HUMAN", newKey, val, 1)
    if newKey ~= oldKey then
        setplayvar(actor, "HUMAN", oldKey, val, 1)
    end
end

local function readMigrated(actor, oldKey)
    local player = class(actor)
    local newKey = KEY_MAP[oldKey] or oldKey
    local v = getplayvar(actor, 2, newKey)
    if v == nil or v == "" then
        v = getplayvar(actor, 2, oldKey)
    end
    return v
end