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perf: cache weekly digest dates #36

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Merged
sarthakagrawal927 merged 4 commits into from
Aug 12, 2026
Merged

perf: cache weekly digest dates #36

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4ad803a
perf: optimize weekly digest aggregation
sarthakagrawal927 Aug 9, 2026
47298bc
perf: cache weekly digest dates
sarthakagrawal927 Aug 12, 2026
12033af
Merge remote-tracking branch 'origin/main' into agent/optimize-weekly…
sarthakagrawal927 Aug 12, 2026
7e6a94e
fix: keep digest date caching within complexity budget
sarthakagrawal927 Aug 12, 2026
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12 changes: 11 additions & 1 deletion src/lib/digest.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,15 @@ function isNewsletterSender(email: string, displayName: string): boolean {
return NEWSLETTER_RE.test(email) || NEWSLETTER_RE.test(displayName);
}

function getCachedTimestamp(value: string, cache: Map<string, number>): number {
const cached = cache.get(value);
if (cached !== undefined) return cached;

const parsed = Date.parse(value);
cache.set(value, parsed);
return parsed;
}

/**
* Build a deterministic weekly digest from locally cached emails.
*/
Expand Down Expand Up @@ -131,6 +140,7 @@ export function buildWeeklyDigest(
string,
{ email: string; displayName: string; newsletter: boolean; domain: string }
>();
const dateCache = new Map<string, number>();
const themeKeyCache = new Map<string, string>();

for (const email of emails) {
Expand All @@ -146,7 +156,7 @@ export function buildWeeklyDigest(
}
if (senderDetails.newsletter) continue;

const t = Date.parse(email.date);
const t = getCachedTimestamp(email.date, dateCache);
if (Number.isNaN(t)) continue;

const sender = senderMap.get(senderDetails.email);
Expand Down