basially this ticket is asking 2 things:

• to re-enable per-recording mastering-artist relationship (it is currently depreciated) as a track-place relationship
• to create new relationship+ place-track:+ "mastered at" - "mastering location for"

I've in the last 6 months seen the "mastered by $person" credit be different per-track on a whole host of releases, often compilations of several origins, where tracks have a mastering credit and then the release also has a mastering credit as a whole. Then today I've discovered a release which has two tracks, each has separate recording, mixing and mastering credits - by different people and on different days, and in addition in different places:

https://winkandspit.bandcamp.com/album/feels-close-my-eyes-7

currently I can not represent any of the mastering credits at all

"Close My Eyes" recorded on July 15th, 2015 and mixed July 24th, 2015 at Val's in Los Angeles, CA by Ty Segall. Mastered by J.J. at Golden Mastering.

"Gwen" recorded and mixed on November 23rd, 2015 at Skylab Studio in Los Angeles, CA by Tommy Dietrick. Mastered by Andrew Schubert at Golden Beat Recording.