Add stl antenna mode

db/migrate/20230510000439_add_stl_to_antennas.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddStlToAntennas < ActiveRecord::Migration[6.1]
+  def change
+    safety_assured do
+      add_column :antennas, :stl, :boolean, null: false, default: false
+      add_index :antennas, :stl
+    end
+  end
+end