Fix missing data after updating with Osm2Psql #221
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Part of #215
This solves part of the problem of missing track sections after updating data in the database.
Using filtered data, and touching the imported data in the Osm2Psql tables is still not supported nor correct by Osm2Psql. However without filtering the database would grow far too large to keep Europe imported and updatable for use on https://openrailwaymap.fly.dev.
Tested in Belgium with importing old OSM data, and then repeatedly updating it.
Before:
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After:
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