FIX: Drop unused tables with a delay

db/fixtures/999_delayed.rb

@@ -10,3 +10,19 @@ Migration::TableDropper.delayed_rename(
     STDERR.puts "Dropping topic_status_updates. It was moved to topic_timers."
   }
 )
+
+Migration::TableDropper.delayed_drop(
+  table_name: 'category_featured_users',
+  after_migration: 'DropUnusedTables',
+  on_drop: ->() {
+    STDERR.puts "Dropping category_featured_users. It isn't used anymore."
+  }
+)
+
+Migration::TableDropper.delayed_drop(
+  table_name: 'versions',
+  after_migration: 'DropUnusedTables',
+  on_drop: ->() {
+    STDERR.puts "Dropping versions. It isn't used anymore."
+  }
+)

db/migrate/20180227161818_drop_unused_tables.rb

@@ -1,7 +1,6 @@
 class DropUnusedTables < ActiveRecord::Migration[5.1]
   def up
-    drop_table :category_featured_users
-    drop_table :versions
+    # Delayed drop of tables "category_featured_users" and "versions"
   end
 
   def down