When you complete a scenario successfully in Railworks, it gets a green tick mark in the scenario list.
This is important for keeping track of your progress and so you don't keep playing the same scenarios all over again.
Railworks (TS2014) keeps information about this and other achievements in your local database.
For some reason, this database sometimes gets corrupted and some or all of your green tick marks get erased.
You may not immediately notice it if only some of them disappear. This is quite annoying.
The only way to preserve this information is to back up your local scenario database, which is a file named SDBCache.bin in the Railworks/Content folder. Of course if you back up your whole Railworks folder then you also back up the database.
The problem lies in restoring this information. If you copy the backup over the current database, you will recover the information in the state it was at the time of the backup. You will lose all tick marks gathered after the backup. If you don't back up regularly, this can be a lot of tick marks.
A better solution would be to open both the old and the new databases and recover only the lost tick marks. This can be done manually, but for 200 scenarios it can take hours, and if you make a single mistake you may end up with a corrupt database. Clearly this needs to be automated.
This new tutorial in the RWA learning center explains how to get and use the RWDBRepair script, which automates this process in a secure and user-friendly way, and completes the whole operation in a few seconds.