Determine if location has been previously visited without performing an overpass query

[Teester]

It should be possible to determine if a location has been previously visited by storing locations of notifications and comparing location to them before performing the query rather than performing the query and comparing osmid to stored osmids as s currently done. (We're currently storing notified osmids for 7 days to prevent unnecessary renotifications)

This should reduce overpass queries which will reduce data use and overpass server use.