This might need to be reverted when properly addressing files deletion
(while monitoring filesystem or when reloading)
However, as of now, I'm not confident this respect the object ownership
graph anyway

This is mostly a workaround before a proper architectural fix

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.

Until our sqlite race condition is fixed