Jazz scales? You are opening a huge can of worms there! Work on your scales and modes and have fun with them. Jazz is all about feel and sensitivity. Learn the basics and discover Jazz for yourself and hook up with a good Jazz pianist, drummer or both if you can. You be suprised how much you can learn from a pianist in this music form, especially when it comes to scales, use of space and soloing. A good Jazz drummer will give you the groove and pace you need to fit everthing into place. It's a continual learning curve and you will discover new things all the time. That's what makes it so fun! I could email you every scale and progression I have, but you will find more and even come up with some yourself. Most of the Jazz lines I play have come from experimenting and listening closely to old Bebop records. A great record to listen to for budding Jazz bass players is Miles Davis, Autumn Leaves. Paul Chambers played bass on that record and it is a great starting point to understand a Jazz bass players role in a band.
A little story! A guy that I really respect is my friends dad Ray Greenwood. He is 70 this year and has been playing Jazz since the age of 14. Awesome double bassist! I jammed with him one time with my KYDD 5 string and Ray emulated a few of my lines. He then said "I love those progressions! Don't mind if I steal them for my next performance?". Wow! I don't really consider myself to be a good Jazz musician, but that was a very humbling experience for me. Like I said, no matter what standard you are you will always pick up new things. Even though most people view me as a rock musician, Jazz has been the backbone of everything I have put my hand to over the years. Not the scales, modes and progressions necessaily, but the musical and technical attitude every style of music that I have played.
Sorry that I babbled on a bit. I love talking about Jazz!