[MapProxy] Seeding - Conditional request based on timestamp?

[andrew kovacs]

I have several instances of MapProxy setup which all receive data from a
central source (source servers are setup as tile servers).  The sources get
updated frequently but not on a set schedule.  And the data that will get
updated is at the higher levels of the cache ie: > level 15.  I am hoping
to avoid running a cleanup and seed on each layer of each dataset to
repopulate the cache, when there might not even be new data.

So the question is - can the seed process be configured to query the source
tiles to determine if the data has a later create/modified timestamp than
the cached data on MapProxy?

Much appreciated, thanks.
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