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perf: add projection + O(1) bucket math to muscle-heatmap endpoint

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Endpoint previously pulled full WorkoutSession documents (including
gpsTrack, notes, kcalEstimate etc.) to count sets per muscle group.
Adds a projection that keeps only startTime + exercises.exerciseId +
whole set objects — safe (avoids the malformed-sub-array issue the
earlier narrower projection caused in the stats overview handler),
but still drops the bulky session-level fields.

Also swaps the per-session findIndex() over the weekly bucket array
for direct date-math against the first bucket's Monday, turning
bucket lookup from O(sessions × weeks) into O(sessions).
This commit is contained in:
Alexander Bocken
2026-04-23 15:31:53 +02:00
parent 0da3b130e4
commit 4112e38306
3 changed files with 14 additions and 17 deletions
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src/routes/api/fitness/stats/muscle-heatmap/+server.ts
+12 -15
View File
@@ -21,20 +21,19 @@ export const GET: RequestHandler = async ({ url, locals }) => {
const since = new Date();
since.setDate(since.getDate() - weeks * 7);
const sessions = await WorkoutSession.find({
createdBy: user.nickname,
startTime: { $gte: since }
}).lean();
const sessions = await WorkoutSession.find(
{ createdBy: user.nickname, startTime: { $gte: since } },
{ startTime: 1, 'exercises.exerciseId': 1, 'exercises.sets': 1 }
).lean();
// Build weekly buckets
type MuscleData = { primary: number; secondary: number };
const weeklyData: { weekStart: string; muscles: Record<string, MuscleData> }[] = [];
// Initialize week buckets
// Initialize week buckets (Monday-aligned)
for (let w = 0; w < weeks; w++) {
const d = new Date();
d.setDate(d.getDate() - (weeks - 1 - w) * 7);
// Find Monday of that week
const day = d.getDay();
const diff = d.getDate() - day + (day === 0 ? -6 : 1);
d.setDate(diff);
@@ -47,18 +46,16 @@ export const GET: RequestHandler = async ({ url, locals }) => {
weeklyData.push({ weekStart, muscles });
}
// Map a session's timestamp straight to a bucket index using the first
// bucket's Monday as the epoch, avoiding a linear findIndex per session.
const firstWeekStartMs = weeklyData.length > 0 ? new Date(weeklyData[0].weekStart).getTime() : 0;
const weekMs = 7 * 86400000;
// Aggregate muscle usage
for (const session of sessions) {
const sessionDate = new Date(session.startTime);
// Find which week bucket
const weekIdx = weeklyData.findIndex((w, i) => {
const start = new Date(w.weekStart);
const nextStart = i + 1 < weeklyData.length
? new Date(weeklyData[i + 1].weekStart)
: new Date(start.getTime() + 7 * 86400000);
return sessionDate >= start && sessionDate < nextStart;
});
if (weekIdx === -1) continue;
const weekIdx = Math.floor((sessionDate.getTime() - firstWeekStartMs) / weekMs);
if (weekIdx < 0 || weekIdx >= weeklyData.length) continue;
const bucket = weeklyData[weekIdx].muscles;