Session API takes too long to respond on production

[kuzdogan]

As discovered in #1270 right now the session API is not responding to requests in time. This happens even with the simplest contract and only on production (not staging).

We need to debug and see where the problem is happening. This is difficult to debug as we don't really have extensive logging or logs that would track the request's whole flow inside the code.

My initial suspicion would be that it's something related to the MemoryStore of express-session BUT when I try to upload a random file like a photo, it does respond on time, saying "no metadata found". So it is related to something downstream.

_{View in Huly HI-1251}

[kuzdogan]

Fixed with the last release.

However we should still implement the session database and review the related CheckedContract code. #1321