Docspell upload API not returning error when there is a database error

I was trying to insert a lot of documents and then I got the following error:

`docspell-restserver | org.postgresql.util.PSQLException: ERROR: could not resize shared memory segment "/PostgreSQL.261413272" to 8388608 bytes: No space left on device`

As a consequence this document was not saved to my database, but the API still returned a status 200.

This is related to default postgres docker image not having enough shared memory `shm-size`, however I feel that Docspell should return an error on the API in that case as the document does not get saved in this case.

More info on this issue:

https://signoz.io/guides/pq-could-not-resize-shared-memory-segment-no-space-left-on-device/