Some graphs going back into the past?!

[mnalis]

Looking at some graph like building:use it produces very strange results, where graph goes backwards in time (timewarping from 2019 back to middle of 2018), and then becomes dotted line for years?

See here: https://taghistory.raifer.tech/#***//building:use

Is it some database corruption or?

[mnalis]

Anyway, that specific issue seem to be caused to caused by erroneous slash in URL. Why it displays anything resembling normal data up to 2018 is misleading. E.g.

• this works: https://taghistory.raifer.tech/#***/building:use/
  

• this goes crazy: https://taghistory.raifer.tech/#***//building:use
  

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Also note that this seems to be related, but separate issue from the less-popular tags not being updated after mid-2018 (e.g. like in https://taghistory.raifer.tech/#***/leisure/swimming_pool&***/amenity/swimming_pool) which seems to be design decision