diff --git a/src/cli.ts b/src/cli.ts
index 059c997..494e313 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -339,8 +339,18 @@ program
 
       // The daily cache is provider-agnostic: always backfill it from .all so subsequent
       // provider-filtered reads can derive per-provider cost+calls from DailyEntry.providers.
+      // Yesterday is always recomputed: it may have been cached mid-day with partial data.
       const cache = await withDailyCacheLock(async () => {
         let c = await loadDailyCache()
+
+        // Evict yesterday (and any stale future entries) so the gap fill recomputes them.
+        const hadYesterday = c.days.some(d => d.date >= yesterdayStr)
+        if (hadYesterday) {
+          const freshDays = c.days.filter(d => d.date < yesterdayStr)
+          const latestFresh = freshDays.length > 0 ? freshDays[freshDays.length - 1].date : null
+          c = { ...c, days: freshDays, lastComputedDate: latestFresh }
+        }
+
         const gapStart = c.lastComputedDate
           ? new Date(new Date(`${c.lastComputedDate}T00:00:00.000Z`).getTime() + MS_PER_DAY)
           : new Date(todayStart.getTime() - BACKFILL_DAYS * MS_PER_DAY)
diff --git a/src/daily-cache.ts b/src/daily-cache.ts
index 1320aa6..11903bf 100644
--- a/src/daily-cache.ts
+++ b/src/daily-cache.ts
@@ -91,14 +91,11 @@ export async function saveDailyCache(cache: DailyCache): Promise<void> {
 }
 
 export function addNewDays(cache: DailyCache, incoming: DailyEntry[], newestDate: string): DailyCache {
-  const seen = new Set(cache.days.map(d => d.date))
-  const merged = [...cache.days]
+  const byDate = new Map(cache.days.map(d => [d.date, d]))
   for (const day of incoming) {
-    if (seen.has(day.date)) continue
-    seen.add(day.date)
-    merged.push(day)
+    byDate.set(day.date, day)
   }
-  merged.sort((a, b) => a.date.localeCompare(b.date))
+  const merged = Array.from(byDate.values()).sort((a, b) => a.date.localeCompare(b.date))
   const nextLast = cache.lastComputedDate && cache.lastComputedDate > newestDate
     ? cache.lastComputedDate
     : newestDate
diff --git a/tests/daily-cache.test.ts b/tests/daily-cache.test.ts
index b1741e3..e89d65d 100644
--- a/tests/daily-cache.test.ts
+++ b/tests/daily-cache.test.ts
@@ -117,7 +117,7 @@ describe('addNewDays', () => {
     expect(updated.lastComputedDate).toBe('2026-04-10')
   })
 
-  it('skips days already present in the cache (first write wins)', () => {
+  it('replaces existing days with incoming data (last write wins)', () => {
     const base: DailyCache = {
       version: DAILY_CACHE_VERSION,
       lastComputedDate: '2026-04-08',
@@ -125,7 +125,7 @@ describe('addNewDays', () => {
     }
     const updated = addNewDays(base, [emptyDay('2026-04-08', 99)], '2026-04-08')
     const aprilEight = updated.days.find(d => d.date === '2026-04-08')!
-    expect(aprilEight.cost).toBe(5)
+    expect(aprilEight.cost).toBe(99)
   })
 
   it('does not regress lastComputedDate if incoming newestDate is older', () => {