I can confirm very similar issues on my Chakra install (kdemod from Arch linux), same digikam and kde version. I have tried to remove all digikam config and rescan the database without luck. The last line "..died unexpectedly" comes every time I double click on a folder in digikam folder view.
$ digikam
QSqlDatabasePrivate::removeDatabase: connection 'ConnectionTest' is still in use, all queries will cease to work.
Time elapsed: 259 ms
Time elapsed: 5 ms
Model: Time elapsed: 336 ms
TextureColorizer: Time elapsed: 47 ms
Time elapsed: 5 ms
Time elapsed: 4 ms
Model: Time elapsed: 16 ms
digikam(27185)/digikam (core) Digikam::AlbumManager::slotDatesJobResult: Failed to list dates
digikam(27185)/digikam (core) Digikam::ImageAlbumModel::slotResult: Failed to list url: "The process for the digikamalbums protocol died unexpectedly."