Database creation too slow

Creating the database takes a long long time. So much that the app doesn't even finish. It came up to 5-10% twice now and it stopped again. It's like the app just gets killed after 15 minutes or something. Now I have to wait for a day to start over again.

I know it's a known issue that db creation takes time, but leaving it as is is not really an option either.

As far as I understood it's the db inserts that take so much time. Shouldn't the app implement some form of service that remains active during db creation? Can't it cache the downloaded csv for reuse if the import did not finish? Are there any other recommendations that allow for the import to finish?