Is it possible to skip some id's?

Question

PostgreSQL

Can I set an id limit for a table. For example, so that the values ​​54 and 37 are not filled in and after the line with id=53 there is a line with id=55?

Answer 1

Will run many telegram bots. I wanted them to work on port=id. But not all ports are free.

The correct solution is compound identifiers.
Those. the identifier must be simultaneously a pair of ports - record id and port (or device) id.
There is a practice when two are stuffed into one numeric identifier, the easiest way is to increase the value of the identifier for each new entry not by 1 but by N, where N is the maximum number of devices (in your case, bots), albeit with a margin. Those. if the port number is P, then the identifier will be equal to P + N * seq, until the number of devices is less than N, they do not intersect and by simple division modulo N, you can extract P from the identifier.
In your postgres it supports sequences