Unfortunately you can only restore a database that you've made a backup of. So if you didn't make a backup of your most recent database, there's no way to simply restore it.
All hope is not lost, however. You can rebuild your database from your tournaments. But it's a somewhat manual process. Here is what you do:
First, you should decide if you want to keep the "restored" DB you already have. If not, you might want to delete it first. To delete it, follow these steps:
- Select the Preferences tab
- Press the Data Stores button
- Right-click on the "Active" row and select "Explore folder". This will open Windows Explorer to that folder. You should see the folders "db", "images", "receipts", "saves", "sounds", and "templates".
- Select the folder named "db" and just rename it (right-click and select "Rename" or just press F2). Rename it anything you want.
- Exit and restart the TD. You should now have an empty database.
To rebuild your database, follow these steps:
- Load one of your tournaments. I would load the latest (most recently run) tournament you have.
- On the Players tab, press the "Database" button
- Press the first button "Add to the database players in your current tournament"
- Select all players by clicking the checkbox in the title row
- Press OK
- Load the next tournament (try to stay in reverse chronological order)
- Repeat with all tournaments
You should find as you continue through your tournaments that the set of players NOT already in your database shrinks each time. Ultimately you should have a good player database.
What this will NOT do is restore any players that were in your database that didn't participate in any tournaments (unless they were added to a tournament but never bought-in). By going in reverse chronological order, if any players have any personal information (like phone or address) that has changed over time, hopefully you'll get the latest copy of that information.