fc / Review History

The review history is stored in a tsv file, to avoid cluttering org files. This makes it easy to calculate review statistics.

Columns:

1. Date in ISO8601 format, second precision
2. Filename
3. Card ID
4. Position
5. Ease (before review)
6. Box (before review)
7. Interval (before review)
8. Rating
9. Seconds spent reviewing the card
10. Repetition Spacing Algorithm used

More advanced review algorithms might need to use the review history of a card. In this case, the card ID + position should be used to look up the review history, as the filename can change when moving cards from file to file.