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775954da9d
To count phones in a custom polygon we need to work out the percentage of overlap with each known area. This means we need to get each known area from the database to compare it. At the moment we do this by running: - one SQLite query to get the details of all matching areas - a loop, which performs one SQLite query *per area* to get the polygons This commit reduces the number of SQLite queries to one, which uses a `JOIN` to get both the details of the areas and their polygons. This gives a speed increase of about 25% for a big area like Lincolnshire.