Load the season's program once, then read it by week, by month, or end to end. Sessions marked as test pieces open a recorder that writes straight into each athlete's ergo scores in the Crew Tracker.
"is_test_piece": true gets a recorder. Scores entered there are stored on the athlete, tagged with the session and piece they came from, and appear under Ergo scores in the Crew Tracker marked program. Re-importing an edited program keeps those links as long as each session keeps its id — see the program file format.
One program is active at a time. Importing replaces it; recorded scores stay attached to their athletes either way.