gravitystorm left a comment (openstreetmap/openstreetmap-website#6512)

For one tiny part of this - I would imagine the best way to designate an area 
is with a polygon - I think squares or circles would be too limiting for 
moderators and they would end up creating multiple adjacent regions to fit a 
real-world situation. If we go down this route, and use polygons, I think it 
would therefore be best built on top of PostGIS rather than rolling our own 
polygon storage and intersection testing.

Another tiny part - defining whether a changeset intersects a given polygon is 
not well defined. One example is when the entities are far apart - e.g. if a 
changeset contains a node in London and one in Australia, would that be blocked 
by a zone over the Middle East? It's the same problem we've had for years with 
the History view.

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