In C0, there is still a relict that works with the strings "input", which is neither tested nor very clear programming. We should create tests for this section and see if we can simplify.

Places where the strings are used:

• As input to C0.receive_timeseries_from_csv() here and here
• In C0.receive_timeseries_from_csv here

In #498 we changed something in that structure, and we have to hope that our benchmark tests protect us from any weird consequences.

Originally posted by @smartie2076 in #498 (comment)