Системи, які не падають. Техніка, яка знову працює.

export async function sha256Hex(text) {
  return toHex(await crypto.subtle.digest('SHA-256', enc.encode(text)));
}
// …
const now = new Date().toISOString();
await env.DB.prepare(
  `update contracts
      set status = 'signed', signed_at = ?, signer_name = ?, signer_image = ?,
          signer_ip = ?, signer_ua = ?, signed_hash = ?,
          signer_phone = ?, signer_address = ?
    where id = ? and status <> 'signed'`,
)
  .bind(
    // …
    await sha256Hex(row.body),
    // …
  )
  .run();

const status = ALL_STATUSES.includes(b.status) ? b.status : row.status;
const now = new Date().toISOString();
// …
if (status !== row.status || clean(b.comment, 500)) {
  await addEvent(env, id, status, clean(b.comment, 500), now);
}

let mailed = false;
if (status === 'ready' && row.status !== 'ready') {
  mailed = await mailOrder(env, 'ready', {
    email: row.client_email,
    lang: row.lang,
    number: row.number,
    device: row.device,
    url: new URL(`/o/${id}`, SITE.url).href,
  });
}

function canary(d) {
  const f = new Intl.DateTimeFormat('en-CA', {
    timeZone: 'Atlantic/Canary', year: 'numeric', month: '2-digit', day: '2-digit',
    hour: '2-digit', minute: '2-digit', hourCycle: 'h23', weekday: 'short',
  });
  const p = Object.fromEntries(f.formatToParts(d).map((x) => [x.type, x.value]));
  const dow = { Sun: 0, Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6 }[p.weekday];
  return { date: `${p.year}-${p.month}-${p.day}`, dow, mins: Number(p.hour) * 60 + Number(p.minute) };
}
const toMins = (hhmm) => Number(hhmm.slice(0, 2)) * 60 + Number(hhmm.slice(3, 5));
const workday = (c) => (HOURS[c.dow] && !HOLIDAYS.has(c.date) ? HOURS[c.dow] : null);

export function shopStatus(now = new Date()) {
  const c = canary(now);
  const h = workday(c);
  if (h && c.mins >= toMins(h[0]) && c.mins < toMins(h[1])) return { open: true, closes: h[1] };
  // …
}