The warning message is fairly clear: if you expect that your join will have a many-to-many relationship, add relationship="many-to-many" as an argument to the join. You have several calls to left_join in your function, try it in any or all of them. The reason that is there because many newer programmers do not recognize what will happen when there is not a clear 1-to-1 or 1-to-many relationship, and are really really confused when the number of rows in the results multiplies a lot. This is a safeguard, a warning. — r2evans 49 secs ago

Time to take the tour. This question is 100% off-topic, as 1) it's not a programming question; and 2) it's soliciting programmers for hire. So basically spam. — David Makogon 35 secs ago

(If you're taking this as a class: please be aware of Open letter to students with homework problems & ensure that you're following your class's collaboration policy.) — Kaia 16 secs ago