local records_key = KEYS[1]

local now_ms = tonumber(ARGV[1])
local proxy_id = ARGV[2]

if not now_ms or now_ms <= 0 or type(proxy_id) ~= 'string' or proxy_id == '' then
    return cjson.encode({status = 'invalid'})
end

local raw = redis.call('HGET', records_key, proxy_id)
if not raw then
    return cjson.encode({status = 'not_found'})
end
local decoded, record = pcall(cjson.decode, raw)
if not decoded or type(record) ~= 'table' or type(record.sourceUpstream) ~= 'string' or
    record.sourceUpstream == '' or type(record.expiresAtMs) ~= 'number' then
    return cjson.encode({status = 'invalid'})
end
if record.expiresAtMs <= now_ms then
    return cjson.encode({status = 'not_found'})
end
return cjson.encode({status = 'ok', upstream = record.sourceUpstream})