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Database is locked at the moment. Makes the pywikibot crash with this error:

Adding new Commons category claim to [[Commons:Category:Green Party of British Columbia]] based on [[en:Category:Green Party of British Columbia]]
Traceback (most recent call last):
  File "C:\pywikibot\core\commonscat_to_wikidata.py", line 238, in <module>
    main()
  File "C:\pywikibot\core\commonscat_to_wikidata.py", line 235, in main
    bot.run()
  File "C:\pywikibot\core\commonscat_to_wikidata.py", line 94, in run
    newclaim.addSource(source, bot=True)
  File "C:\pywikibot\core\pywikibot\page.py", line 2957, in addSource
    self.addSources([claim], **kwargs)
  File "C:\pywikibot\core\pywikibot\page.py", line 2965, in addSources
    data = self.repo.editSource(self, claims, new=True, **kwargs)
  File "C:\pywikibot\core\pywikibot\site.py", line 720, in callee
    return fn(self, *args, **kwargs)
  File "C:\pywikibot\core\pywikibot\site.py", line 3797, in editSource
    data = req.submit()
  File "C:\pywikibot\core\pywikibot\data\api.py", line 401, in submit
    raise APIError(code, info, **result["error"])
pywikibot.data.api.APIError: internal_api_error_ReadOnlyError: Exception Caught:
 The database is currently locked to new entries and other modifications, probably for routine database maintenance, after which it will be back to normal.

The administrator who locked it offered this explanation: The database has been automatically locked while the slave database servers catch up to the master

Should be caught like any other api error, back off, wait some time. Try again until we reach max tries.