diff --git a/db/migrate/20240926225916_create_hourly_workflow_classification_count.rb b/db/migrate/20240926225916_create_hourly_workflow_classification_count.rb
index ef0c334..e4be895 100644
--- a/db/migrate/20240926225916_create_hourly_workflow_classification_count.rb
+++ b/db/migrate/20240926225916_create_hourly_workflow_classification_count.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true.
+
 class CreateHourlyWorkflowClassificationCount < ActiveRecord::Migration[7.0]
   # we have to disable the migration transaction because creating materialized views within it is not allowed.
 
diff --git a/db/migrate/20240926231010_add_refresh_policy_for_hourly_workflow_count.rb b/db/migrate/20240926231010_add_refresh_policy_for_hourly_workflow_count.rb
index 3960e70..e273a34 100644
--- a/db/migrate/20240926231010_add_refresh_policy_for_hourly_workflow_count.rb
+++ b/db/migrate/20240926231010_add_refresh_policy_for_hourly_workflow_count.rb
@@ -1,3 +1,6 @@
+# frozen_string_literal: true
+
+
 class AddRefreshPolicyForHourlyWorkflowCount < ActiveRecord::Migration[7.0]
   disable_ddl_transaction!
   def change
diff --git a/db/migrate/20240926231325_create_data_retention_policy_for_hourly_workflow_count.rb b/db/migrate/20240926231325_create_data_retention_policy_for_hourly_workflow_count.rb
index 1f26b0b..23c7aca 100644
--- a/db/migrate/20240926231325_create_data_retention_policy_for_hourly_workflow_count.rb
+++ b/db/migrate/20240926231325_create_data_retention_policy_for_hourly_workflow_count.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateDataRetentionPolicyForHourlyWorkflowCount < ActiveRecord::Migration[7.0]
   disable_ddl_transaction!
   def change
diff --git a/db/migrate/20240926233924_alter_daily_workflow_classification_count_to_materialized_only.rb b/db/migrate/20240926233924_alter_daily_workflow_classification_count_to_materialized_only.rb
index 660c042..9418a27 100644
--- a/db/migrate/20240926233924_alter_daily_workflow_classification_count_to_materialized_only.rb
+++ b/db/migrate/20240926233924_alter_daily_workflow_classification_count_to_materialized_only.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AlterDailyWorkflowClassificationCountToMaterializedOnly < ActiveRecord::Migration[7.0]
   disable_ddl_transaction!
   def up