Concurrency conflicts for download counter not detected using SQLite

[appel1]

Was looking at #716 and couldn't reproduce the issue using an SQLite db. I'm not sure, but I think the EF SQLite implementation does not update the specified rowVersion column automatically. You have to add a trigger that updates it yourself in a migration.

To reproduce download a package and check the RowVersion column in the db. It is still the default value, null.

Simulating a concurrency conflict does not trigger a DbUpdateConcurrencyException either.