Hi @wwitt,
It seems like that index is already created.
I have been watching github logs since version 6.3.1 (the one we use), and i have seen some interesting new features and fixes:
SQL queries on batch: https://github.com/flowable/flowable-engine/commit/89b8a121b8a0b39f97d4ade5f7b44fa248df01f7#diff-7709168244fdf53602bc14feb5f5cf7f
JPA variables visibility fix: https://github.com/flowable/flowable-engine/commit/cdc5bb78601dff594cbf78ac23fe9e678346a230#diff-7709168244fdf53602bc14feb5f5cf7f
Change of locking policy: https://github.com/flowable/flowable-engine/commit/7981ba28827dae3e2ab473d36e1aad0e426720bf#diff-7709168244fdf53602bc14feb5f5cf7f
Do you think this may improve performance and avoid deadlock?
Greetings