retrieve
open override fun retrieveImageWithOptionalAdministrativeUnitName(): Flow<Pair<Image, AdministrativeUnitName?>>
Retrieves a Flow of Pair<Image, AdministrativeUnitName?>.
This method retrieves Image data along with an possibly missing associated AdministrativeUnitName entity. It utilizes Flow to emit data asynchronously.
To avoid emitting duplicate Image entries, it maintains a set of IDs (imagesSet). Only new (unseen) entries are emitted.