Database Warning

In this release, the database format was changed. Please read the instructions of migrate.py for instructions on how to migrate.

Changes in this version

Add content manager role
- Content managers can manage all content (announcement, contests, problems, homepage) on the site but not users
Add user search to admin users page
Fixed many race conditions
- Including one that caused incorrect scoreboards
Minor performance improvements
Increased database integrity
Bug fixes
Add tests
Code cleanup