Add the following places to the production database

[Grunkhead]

Not sure, if all of them are missing.

's-Gravenzande Monster Westland (region) Naaldwijk Maassluis Poeldijk Hoek van Holland De Lier Schipluiden Honselersdijk Kwintsheul Poeldijk Ter Heijde Wateringen Maassland

[wtfloris]

As the /filter city help message states: cities are added based on scraping results, not manually.

Either way, the plan is to remove the "possible cities" list altogether and just allow users to do text-based filtering, as it allows for more flexibility.