Here's a new instructional course I helped put together -- Gypsy Jazz Bass, taught by the great Arnoud van den Berg (Robin Nolan Trio, Hot Club d'Europe, Jimmy Rosenberg).
There's not a ton of instructional material specifically for playing bass in a gypsy jazz band. Lots of bassists just wing it, or play in a more straightahead style. This course is intended to be the solution to that.
Arnoud talks about the differences in this style, along with providing many sample bass lines/etudes.
More info here: https://www.soundslice.com/lessons/gypsy-jazz-bass/