Update SQL migration for council district project distribution analytics view

This commit modifies the migration files by adding an index for improved performance on the `layer_council_district` table and includes a rollback command to drop the index if it exists. These changes enhance the efficiency of querying project distributions by council district.

Author: frankhereford

moped-database/migrations/default/1758551918596_adjust-projects-per-district-view/down.sql

@@ -1,3 +1,6 @@
+DROP INDEX IF EXISTS idx_council_district_geom_2277;
+
+
 CREATE OR REPLACE VIEW council_district_project_distribution_analytics AS WITH area_project_buffers AS (
     SELECT
         projects.project_id,

moped-database/migrations/default/1758551918596_adjust-projects-per-district-view/up.sql

@@ -43,3 +43,7 @@ SELECT
 FROM area_district_aggregates AS ada
 INNER JOIN project_totals AS pt ON ada.project_id = pt.project_id
 ORDER BY ada.project_id, ada.council_district_id;
+
+
+CREATE INDEX IF NOT EXISTS idx_council_district_geom_2277
+ON layer_council_district USING gist (st_transform(geography::geometry, 2277));