[BUG] Streak tracker silently breaks for streaks longer than 90 days — hardcoded look-back window truncates history

[MehtabSandhu11]

Summary

The streak calculation has a hardcoded 90-day look-back window. Any user whose current or longest streak exceeds 90 days will see a wrong (truncated) streak value with no warning. This also means the "Longest Streak" stat is unreliable for any dedicated contributor.

Root Cause

In src/app/api/metrics/streak/route.ts, fetchActiveDates hardcodes the search window to 90 days:

const since = new Date();
since.setDate(since.getDate() - 90);

This is also duplicated in the GET handler itself:

const since = new Date();
since.setDate(since.getDate() - 90);
const sinceStr = since.toISOString().slice(0, 10);

calculateStreakFromDates then operates only on the dates returned within this window. If a user has been committing every day for 120 days:

• The actual streak is 120 days
• The returned activeDates only covers the last 90 days
• current is reported as 90 (or less if today/yesterday falls outside)
• longest is capped at whatever run exists within the 90-day slice

The same 90-day cap exists in the public profile API (src/app/api/public/[username]/route.ts, fetchStreak function), meaning public-facing profiles also display wrong streaks.

The leaderboard (src/app/api/leaderboard/route.ts) uses streakStart = toDateStr(new Date(Date.now() - 90 * 86400000)) for the same reason — leaderboard streak rankings are therefore incorrect for top contributors.

Impact

• Users with long streaks see demoralizing, incorrect numbers
• Leaderboard streak rankings are wrong for the most active users (the ones most likely to have streaks >90 days)
• No error or caveat is shown to the user — the number looks authoritative

Expected Behaviour

The look-back window for streak calculation should extend far enough to capture any realistic streak. A sensible approach: fetch up to 365 days of history (the GitHub Search API supports date ranges up to a year), or use a configurable STREAK_LOOKBACK_DAYS constant. The current/longest streak values should always reflect real history.

Proposed Fix

1. Introduce a constant STREAK_LOOKBACK_DAYS = 365 in src/app/api/metrics/streak/route.ts
2. Replace all hardcoded 90 references in the streak route, the public profile route, and the leaderboard route with this constant
3. Adjust the cache TTL if needed since a larger window will return more data

Labels

bug advanced ~3h

Please assign this to me under GSSoC

[MehtabSandhu11]

assign this issue to me under GSSoC