[digikam] [Bug 503009] New: DigiKam fails to detect imported photos on `add image`

[bug-control at kde.org]

https://bugs.kde.org/show_bug.cgi?id=503009

            Bug ID: 503009
           Summary: DigiKam fails to detect imported photos on `add image`
    Classification: Applications
           Product: digikam
           Version: 8.6.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Import-Albums
          Assignee: digikam-bugs-null at kde.org
          Reporter: kde_org at reepie.nl
  Target Milestone: ---

SUMMARY
Digikam doesn't indicate already uploaded images as being present. A record is
present in the `DownloadHistory` table.
When it uploads an already existing image, it doesn't show the `has already
been uploaded` mark on the import dialog screen when done. No duplicate image
seems to be present in the album nor on disk. BUT the `DownloadHistory` table
now lists TWO records for this image with DIFFERENT hashes.

This behaviour is inconsistent between uploads. A previous upload maybe handled
without problems. The next has this problem. So it is difficult to reproduce
clearly. These steps are based on trying to see why images were indicated as
not being downloaded.

STEPS TO REPRODUCE/happened
1. Add images option with a local directory with new images to add to the
album. Type *.HEIC (iPhone) 
2. 'Download all' -> images are processed. With `Date-based sub albums`
3. Album and images are present when done -
4. Re-visit `Add images` with the same directory
5. All images are shown as not being downloaded before
6. Focus on one image -> DownloadHistory entry exist for it
7. Select the image to download again and download it -> icon indicator doesn't
change: still `not downloaded before`
8a. DownloadHistory contains TWO records for the same image name and details
with DIFFERENT hashes
8b. NO duplicate image has been downloaded as there is no duplicate file in the
album (on disk) or in the album overview
9. Re-visit `Add images` with the same directory AGAIN
10. NOW the specific image IS indicated as being uploaded before

I am aware that DK is not able to de-duplicate already existing images which
are not downloaded with the tool. In this case images are downloaded from the
same folder from a different machine: e.g. it is the identical source.

It is unclear to me how the hash can be used to track relation in other tables. 

OBSERVED RESULT
Already downloaded image not being detected
Duplicate entries in Downloadhistory tabel after 2nd download with DIFFERENT
hashes (same name, size, date)

EXPECTED RESULT
Images being indicated as downloaded when present in (any) album
No duplicate entries in Downloadhistory table for the same image

SOFTWARE/OS VERSIONS
macOS: 15.5.1 with Digikam 8.6.0

ADDITIONAL INFORMATION
MariaDB: 11.7.2-MariaDB Homebrew 
Images located on a Linux Ubuntu 24.04 server

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