SCIdude created this task.
SCIdude added a project: Wikidata.
Restricted Application added a subscriber: Aklapper.

TASK DESCRIPTION
  Worsening of Query Service performance is inevitable. This is of concern for 
maintenance bots that work with existing items, because queries to the WDQS may 
not even return with large datasets (articles, chemical compounds, proteins). 
So the maintainer works with a WD dump that has certain age, moreover the 
processing of the dump can take a long time (days). Items may change in that 
time.
  
  One solution, other than improving the service, may be to offer functionality 
in the WD API that allows to set a parameter of date type and value **//x//**, 
a date in the past. The effect of it should be to return an error if a change 
was attempted, within the same edit group, to an item that has a last changed 
date later than **//x//**. This way no items are overwritten that have changed 
in the meantime, e.g. after the dump was made.
  
  Or something to that effect, please improve the idea! I have little knowledge 
about the API so maybe the best implementation might look quite different. 
However, there is real need for such functionality, in my opinion.

TASK DETAIL
  https://phabricator.wikimedia.org/T270003

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: SCIdude
Cc: Aklapper, SCIdude, Akuckartz, Nandana, Lahi, Gq86, GoranSMilovanovic, 
QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, 
Mbch331
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