DEV: Drop unused columns

db/post_migrate/20200120131338_drop_unused_columns.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class DropUnusedColumns < ActiveRecord::Migration[6.0]
+  DROPPED_COLUMNS ||= {
+    post_replies: %i{
+      reply_id
+    },
+    user_profiles: %i{
+      card_background
+      profile_background
+    }
+  }
+
+  def up
+    DROPPED_COLUMNS.each do |table, columns|
+      Migration::ColumnDropper.execute_drop(table, columns)
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end