Create SettingEntry model

db/migrate/20200811074839_create_setting_entries.rb

@@ -0,0 +1,16 @@
+class CreateSettingEntries < ActiveRecord::Migration[6.0]
+  def change
+    create_table :setting_entries do |t|
+      t.string :code, null: false, index: { unique: true }
+      t.string :value, null: false
+      t.string :group, null: false
+      t.string :format, null: false
+
+      # Versioning related
+      t.string :creator_str
+      t.string :updator_str
+
+      t.timestamps
+    end
+  end
+end