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Everything was already cherry-picked, or something like that, so no changes
are involved, at all.

If we can’t open it at startup, we exit.
If we can’t open it on reload, we keep the previously-opened database.

This way, we’re assured to always have a valid and open database available.

fix #3269

ref #3269

Pure c++ sqlite3 ORM

Closes #3271

See merge request !11

Entirely replace LiteSQL

fix #3271

Simplifies the CMakeLists.txt a little bit

fix #3266

fix #3266