[Tilesathome] [PATCH] To delete a tile

[Martijn van Oosterhout]

Hi,

As part of the plan to reduce the number of entries needed in the
blank tiles database, I'd like to propose the attached patch that,
when you upload a tile which is zero bytes long, deletes the real tile
as well as the entry from the tiles_blank database.

Two reasons:
1. There are places in the world were in the past blank land has been
uploaded where there should be blank sea. There is a fall back
machanism, so it'd be better to simply delete them than overwrite
them.

2. When a client renders a blank area it ends up uploading blank tiles
for zoom-12 to 17 which is overkill. With this patch we open the way
to the client uploading only say zoom-12 and zoom-15 and deleting all
the other tiles. This saves 1300 entries in the blank tiles db per
zoom-12 tile, while having the fallback system only have to search a
maximum of three levels. Also, files coming from the clients will
still have exactly 1365 files, a complete set. The same principle can
also optimise areas of the world where there is only sea.

Please consider applying (after appropriate testing ofcourse),
-- 
Martijn van Oosterhout <kleptog at gmail.com> http://svana.org/kleptog/
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