I have read about situations where chips are exhausted, or vouchers are not enough and some things like that. With this notice which surely will give rise to traffic, how are you preparing for it?.
Chip shortage occurs when there is much higher input traffic than expected. Redeeming vouchers does not affect it because we keep more chips in pool than sum of all vouchers.
what would happen if before site goes "offline", we still have open session waiting for deposit
and the bitcoin deposit got stuck in limbo because very low tx fee was used
then we couldn't extend it when site goes "offline" for a few days
can we recover it by proof of signature from sender address or something?
Last time we have added big red sign. It did not work - we still had a lot of customers sending their coins to mix. We had to froze sessions (disable deletion after 48h), so they could be refrozen at support request.
If your session will be active while we go offline, send us an e-mail to support. We will solve your problem (but you may have to wait till we get online, so mix now, do not wait for fork).