Duplicate page entries
We always add a new page entry, while we should check whether it already exists.
https://gitlab.kwant-project.org/zesje/zesje/-/blob/master/zesje/raw_scans.py#L31
We always add a new page entry, while we should check whether it already exists.
https://gitlab.kwant-project.org/zesje/zesje/-/blob/master/zesje/raw_scans.py#L31