celery/celery — pull request #1748 by shariq1010 (2013-12-18 08:42:31+00:00)
Title: Update models.py

`task_id = sa.Column(sa.String(255), unique=True)`
Th above statement is not executing on MySQL saying "(1071, 'Specified key was too long; max key length is 767 bytes')"

reducing the task_id to 155 char is working fine