PostgreSQL table fahrplan too big

[martinheppner]

The provider blocked access to our PostgreSQL database, because it is using too much space on disk (> 30GB). The biggest table is "fahrplan". Can we reduce the size somehow?

On this page I found a select to show the biggest columns in the datrabse: https://stackoverflow.com/questions/18316893/how-to-estimate-the-size-of-one-column-in-a-postgres-table