Make tile expire order configurable#2493
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When limiting the number of tiles to be expired with `max_tiles_per_run` we are ordering the tiles by `first`, i.e. oldest first. The new setting `order_by` allows this to be changed. It must be set to a proper SQL ORDER BY clause, the default is "first" as before. A useful different order for instance is "last, first". This will order tiles first that have not been touched the longest.
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When limiting the number of tiles to be expired with
max_tiles_per_runwe are ordering the tiles byfirst, i.e. oldest first. The new settingorder_byallows this to be changed. It must be set to a proper SQL ORDER BY clause, the default is "first" as before.A useful different order for instance is "last, first". This will order tiles first that have not been touched the longest.