Adding index for prioritised column within assessments table

This is because of it being one of the filters within the assessor CMS

Author: Hassanmir92

app/models/assessment.rb

@@ -34,6 +34,7 @@
 # Indexes
 #
 #  index_assessments_on_application_form_id  (application_form_id)
+#  index_assessments_on_prioritised          (prioritised)
 #
 # Foreign Keys
 #

db/migrate/20250717130942_add_prioritised_index_to_assessment.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddPrioritisedIndexToAssessment < ActiveRecord::Migration[8.0]
+  def change
+    add_index :assessments, :prioritised
+  end
+end

db/schema.rb

@@ -34,6 +34,7 @@
 # Indexes
 #
 #  index_assessments_on_application_form_id  (application_form_id)
+#  index_assessments_on_prioritised          (prioritised)
 #
 # Foreign Keys
 #

docs/diagram.pdf

@@ -34,6 +34,7 @@
 # Indexes
 #
 #  index_assessments_on_application_form_id  (application_form_id)
+#  index_assessments_on_prioritised          (prioritised)
 #
 # Foreign Keys
 #