Add method to check if directory exists
Replace integer primary key of runs table with unicode. This is so that we can avoid directory naming collisions on EC2 and S3
Replace integer primary key of runs table with unicode. This is so that we can avoid directory naming collisions on EC2 and S3
1. Remove unnecessary cast to string.
2. Ignore errors when trying to remove run dir on delete
Remove status/logs from db whene deleting workflow.