Telegram Webhook

Telegram update ingest.

Returns 200 on every accepted update — Telegram retries non-200s and we never want to be a retry source for non-reply spam. The only non-200 we return is 403 on a bad / missing secret token.

We deliberately accept-and-ignore many shapes (channel posts, inline queries, edited messages, ...) — we ONLY act on update.message.reply_to_message.message_id matches against a pending decision row.