Nice, I'm glad that you could finish that so fast 
Review hints:
- in the ticket it states that you retrieve the import progress for each engine. However, that's actually not the case, because we get only the overall import progress. Please adjust the ticket description and create a new ticket to implement that the import progress reports the progress for each engine.
- This endpoint is not secured, is it? That's not crucial for the status, but I just want to keep that in mind if we want to add more websocket endpoints.
- we should document the endpoint somewhere, so other (front-end) developers can get some information about it. Especially, if Sebastian wants to implement the websockets in the front-end, he needs to know the endpoint and what kind of data to expect. I would suggest to have another wiki article next to the rest api documentation.
- StatusWebSocketIT: I don't like the sleep statement in the test. That makes it very prone to errors. Maybe we can rearrange the test a bit. Let's discuss this.
Nice, I'm glad that you could finish that so fast
Review hints: