Add index-dropping migrations

migrations/002.index-geometries.down.sql

@@ -0,0 +1,10 @@
+-- Drop geometric indexes
+
+-- Spatial index over geometries
+DROP INDEX IF EXISTS geometries_idx;
+
+-- Source ID index over geometries
+DROP INDEX IF EXISTS geometries_source_idx;
+
+-- Index over building geometry_id (expect to look up building by geometry_id for map tiles)
+DROP INDEX IF EXISTS building_geometry_idx;

migrations/003.index-buildings.down.sql

@@ -0,0 +1,4 @@
+-- Drop building indexes
+
+-- UPRN index over buildings
+DROP INDEX IF EXISTS building_uprn_idx;