Added new migrations

• Added:
- new migrations

db/migrate/20200806231714_add_indexes_to_status_stats.rb

@@ -0,0 +1,10 @@
+class AddIndexesToStatusStats < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :status_stats, :updated_at, algorithm: :concurrently
+    add_index :status_stats, :replies_count, algorithm: :concurrently
+    add_index :status_stats, :reblogs_count, algorithm: :concurrently
+    add_index :status_stats, :favourites_count, algorithm: :concurrently
+  end
+end