[Tile-serving] [openstreetmap/osm2pgsql] Rewrite tile expiry (management of expired tiles) (#709)

[Sarah Hoffmann]

If only one zoom level is requested for expiry, then the behavior is the same. For multiple level, people using scripts for the combined tiles will suddenly do a lot of unnecessary expiries. So it will increase the load but won't break anything.

You mentioned an increase in size by factor 20. For how many zoom levels was that and what are the absolute file sizes in the result. An increase from 100 kB to 2MB probably doesn't matter. However, going from 100MB to 2GB is a problem.

@SomeoneElseOSM The number of tiles grows with exponentially with each zoom level. I don't think there is much we can do about expiry at zoom level 28.

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