At the moment, result-set-management is not implemented, the whole history
(well, at most 1024 messages) is returned.

Use strftime instead

[skip ci]

Instead of doing a broken SQL request that returns weird lines

Not messages coming from the room, for example

This should fix #3205

It’s now easier to use. The distinction between a nick and a channel name is
based on the first character (by default it's '#' and '&'). The user doesn’t
have to worry about which separator to use anymore.

fix #3066