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This makes it easier to scan a row and extract values to variables,
without having to manually pass the column index.
In the likely event we add/remove columns, this will help prevent
regressions as well.

Traits function expect signed int, as this is what sqlite expect

It allows us not to share connections between threads, and will do for
the time being.
It's quite unsafe, as TLS is used to store the connection, but doesn't
mark the connections as released.
This is mostly commited as such to move forward, we'll have to rewrite
the databases interactions in a near future
Now I'll be in the corner, crying.

This is more convenient to set a FK to null when it's unset, rather than
having to write 2 different insert statements

It only does binding a nullptr to sqlite, since we can't write to a
nullptr, nor can we assign nullptr to int/string/float/...

This will avoid random crash due to dangling pointer in case the DB was
released

So we don't have to call .c_str() every 10 lines

Objects were always created and added to cache, regardless of their
status in DB