Progress Tracking & Dashboard

Dashboard components

src/ui/pages/Dashboard.tsx composes several data-driven components:

• BandScoreChart (src/ui/components/dashboard/BandScoreChart.tsx) — a Recharts LineChart plotting score_band over completed_at per module (reading/listening/writing), fetched via listUserTestSessions(userId).
• StudyHeatmap (src/ui/components/dashboard/StudyHeatmap.tsx) — calendar-style heatmap of study activity.
• Streak counter — Dashboard.tsx computes a "day streak" locally by walking session completed_at/activity dates and counting consecutive days of activity, displayed as "N day streak".

Data driving the dashboard

All dashboard state is derived from user_test_sessions rows (see Database Schema):

Field	Drives
status	in-progress vs. completed test counts
progress_percent	resumable-session progress bars
score_band	band score trend chart, overall average
last_active_at	recency sorting, "continue where you left off"
attempt_number	retake history (see below)

Retake history & attempt numbering

Each time a candidate retakes the same test, a new user_test_sessions row is inserted with an incremented attempt_number (same user_id + test_id + test_type). This preserves full retake history rather than overwriting the previous attempt.

Selecting the session to display

When merging session progress onto a Practice Library card, practice_library::merge_sessions (src/core/src/repositories/practice_library.rs) picks the session with the highest attempt_number per test for that user, so the dashboard/library always reflects the candidate's most recent attempt rather than their first:

/// the given user onto each test row, picking the session with the highest
/// `attempt_number` per test.
pub async fn merge_sessions(...)

See Practice Test Library for the full merge behavior.