For reference on how to do this, see e. g. T255241 and T262198.

after running the maintenance script, some communication to the community is to be done - developers will rely on @Lea_Lacroix_WMDE @Lydia_Pintscher @Mohammed_Sadat_WMDE doing it.

@hoo During task inspection we operated under the assumption that you have the needed rights to perform this and kindly request that you let one (at least) of the team participate in doing this together with you.

Mentioned in SAL (#wikimedia-operations) [2020-10-07T14:04:15Z] <hoo> Ran "mwscript extensions/Wikibase/repo/maintenance/changePropertyDataType.php --wiki=wikidatawiki --property-id P1820 --new-data-type external-id" on mwmaint2001 (T263986)