[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add max_tiles_per_run setting for tile generalizers (PR #2450)

[Jochen Topf]

Limits the number of tiles for which the generalizer is run. Used when generalization is too expensive to always run for all expired tiles. There is a good chance that later changes in the data affect the same tile again, so in the long run this saves effort.

Tiles are generalized oldest first when this is used. Don't set `max_tiles_per_run` or set to 0 to run generalization for all tiles
in the expire table for that zoom level.
You can view, comment on, or merge this pull request online at:

  https://github.com/osm2pgsql-dev/osm2pgsql/pull/2450

-- Commit Summary --

  * Fix: Delete to be expired tiles at the same time as reading them
  * Add max_tiles_per_run setting for tile generalizers

-- File Changes --

    M src/gen/osm2pgsql-gen.cpp (32)

-- Patch Links --

https://github.com/osm2pgsql-dev/osm2pgsql/pull/2450.patch
https://github.com/osm2pgsql-dev/osm2pgsql/pull/2450.diff

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