fix orphaned tokens migration for some MySQL imported schemas

db/migrate/20221017073431_remove_orphaned_tokens.rb

@@ -1,10 +1,30 @@
 class RemoveOrphanedTokens < ActiveRecord::Migration[7.0]
   def up
     Token::Base.where.not(user_id: User.select(:id)).delete_all
+
+    # Make sure we have bigint columns on both sides so the foreign key can be added.
+    # It could be that they are of type numeric if the data was migrated from MySQL once.
+    make_bigint! :users, :id
+    make_bigint! :tokens, :user_id
+
     add_foreign_key :tokens, :users
   end
 
   def down
     # Nothing to do
   end
+
+  def make_bigint!(table, field)
+    return if bigint? table, field
+
+    change_column table, field, :bigint
+  end
+
+  def bigint?(table, field)
+    get_column_type(table, field).to_s == "bigint"
+  end
+
+  def get_column_type(table, field)
+    ActiveRecord::Base.connection.columns(table.to_s).find { |col| col.name == field.to_s }&.sql_type
+  end
 end