Database import fails when folder is prefixed with `db-`

[hvitved]

Describe the bug

It is not a big problem, except the DBs we download from DCA all contain this prefix.

[hvitved]

Ping @esbena so you are aware as well (perhaps the easiest fix is just for DCA to not add the db- prefix).

[esbena]

Can you check if database- is an acceptable prefix?

[hvitved]

It is.

[aeisenberg]

I put in a fix.