See: Recover project - Audacity 80.156.6
After repairing your corrupt database, you especially want to keep current backups, particularly in a .WAV file format that you can revert to.
Additionally, I sometimes copy the entire project to a new project by following these four (4) steps:
- Ctrl+A = Select All
- Ctrl+C = Copy
- Ctrl+N = New
- Ctrl+V = Paste; and do NOT copy smart clip information, when prompted.
Good luck!
Oh, and don’t run Audacity projects from networked drives.