fix schema and migration

db/migrate/20220706104313_add_unit_type_sh.rb

@@ -1,5 +1,7 @@
 class AddUnitTypeSh < ActiveRecord::Migration[7.0]
-  change_table :case_logs, bulk: true do |t|
+  def change
-    t.integer :unittype_sh
+    change_table :case_logs, bulk: true do |t|
+      t.integer :unittype_sh
+    end
   end
 end