[Tile-serving] [osm2pgsql-dev/osm2pgsql] osm2pgsql using too much memory for expire lists (Issue #2190)

[Jochen Topf]

joto left a comment (osm2pgsql-dev/osm2pgsql#2190)

[This blog post](https://protomaps.com/blog/pmtiles-compressed-bitmaps/) describes a clever algorithm/storage method that could help us. Not sure though because we'd still have the worst case scenario of a checkerboard pattern. 

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