#+TITLE: Review History
#+DATE: [2020-08-01 Sat 10:47]
#+KEYWORDS: fc

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. [[file:repetition_spacing_algorithm.org][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.