language-screenshots-VisualEditor/69 failed with MediawikiApi::ApiError: The database has been automatically locked while the slave database servers catch up to the master (readonly). I have thought that f9ebb1f would make that impossible.

rescue MediawikiApi::ApiError => mwerr
  return 'exists: fileexists-no-change' if mwerr.code == 'fileexists-no-change'
  return 'exists: fileexists-shared-forbidden' if mwerr.code == 'fileexists-shared-forbidden'
  return "error: #{mwerr}"
ensure

Apparently, I did not test it. 🤦‍♂️

To test it:

• Run the upload script targeting mediawiki-vagrant. At one point shut down mediawiki-vagrant VM.
• Alternatively, run the script targeting Commons at beta cluster. At one point, introduce an error, like turning of wifi.

The script should report the error, but continue to the next file.