Importing a taxonomy seems to work every other operations (maybe only in debug mode)

[alexgarel]

What

If I'm importing a taxonomy (eg. countries),
I cannot get the list of open projects.

Steps to reproduce the behavior:

1. go to home page and create a new project
2. start a project with countries taxonomies
3. open the app in a new tab, and try to list existing projects

The list is not displayed… you wait with the animation circling and eventually you get a timeout.

Expected behavior

We should be able to run those operations concurrently.

Note: 
I suspect this might be because the parser uses the database in synchronous mode, while we use async with FastAPI !
The parser must support using async (and this is a good occasion to separate database operation from the rest of the code).