tiels are cached and reused properly

SatelliteProvider.DataAccess/Migrations/004_AddVersionColumn.sql

@@ -0,0 +1,13 @@
+ALTER TABLE tiles ADD COLUMN version INT NOT NULL DEFAULT 2025;
+
+DELETE FROM tiles a
+USING tiles b
+WHERE a.id > b.id
+  AND a.latitude = b.latitude
+  AND a.longitude = b.longitude
+  AND a.zoom_level = b.zoom_level
+  AND a.tile_size_meters = b.tile_size_meters
+  AND a.version = b.version;
+
+CREATE UNIQUE INDEX idx_tiles_unique_location ON tiles(latitude, longitude, zoom_level, tile_size_meters, version);
+