Added down migration

Signed-off-by: Sanjay Babu <sanjaytkbabu@gmail.com>

Author: sanjaytkbabu

app/src/db/migrations/20260105000000_050-remove-developed-in-bc.ts

@@ -13,4 +13,14 @@ export async function up(knex: Knex): Promise<void> {
   );
 }
 
-export async function down(): Promise<void> {}
+export async function down(knex: Knex): Promise<void> {
+  return (
+    Promise.resolve()
+      // Add is_developed_in_bc column to housing_project
+      .then(() =>
+        knex.schema.alterTable('housing_project', function (table) {
+          table.text('is_developed_in_bc');
+        })
+      )
+  );
+}