Be careful with random tests for the final attempt, in my case sometimes they worked and sometimes not.
It should be better to have fixed tests that can be passed only by respecting certain conditions.

You are not going to spoil that much with an example yielding 2 or 3, especially due to the meeting difficulty being linked to nested brackets.

I think an example would be too much of a spoiler

Quite poorly explained. Please put at least one example.

How? When the minimum date is different from '2020-01-01' for example, you have to add it. It's not possible with simple SQL.

Interesting kata, but please add some tables'explanation and change their name. For example translations --> language_available.
In addition, explain the condition, for not_trained, not_ocmpleted etc. better.
For example, the Charlie case with C is not very understandable.

It always returns timeout, I tried with solutions from others and still the same.

Where can I find the solution?

pd.pivot_table(): "Bonjour"

Tests are broken, they fail even when the result is correct due to column types issues.
How to report it?