Follow up for issue #1977 - recent_views fk already exists, reconnect on postgres to be able to execute further sql statements.

db/migrate/20180426134922_issue_1977_remove_invalid_user_foreign_keys.rb

@@ -29,6 +29,7 @@ class Issue1977RemoveInvalidUserForeignKeys < ActiveRecord::Migration[5.1]
       rescue ActiveRecord::StatementInvalid => e
         Rails.logger.info "Can't add foreign_keys '#{args.inspect}'"
         Rails.logger.info e
+        ActiveRecord::Base.connection.reconnect!
       end
     end
   end