perf(income): compute Moscow dates once

src/modules/investments/income/income-analytics.service.spec.ts

@@ -189,6 +189,49 @@ describe('IncomeAnalyticsService', () => {
     ).toEqual(['10.25', '-0.25']);
   });
 
+  it('assigns signed payments to Moscow days and retains empty buckets', async () => {
+    seed([
+      {
+        ...entry('before', 'OPERATION_TYPE_COUPON', '0.1', 'RUB'),
+        occurredAt: '2026-01-14T20:59:59.999Z',
+      },
+      {
+        ...entry('after', 'OPERATION_TYPE_COUPON', '0.2', 'RUB'),
+        occurredAt: '2026-01-14T21:00:00.000Z',
+      },
+      {
+        ...entry('reversal', 'OPERATION_TYPE_DIVIDEND', '-0.1', 'RUB'),
+        occurredAt: '2026-01-15T20:59:59.999Z',
+      },
+    ]);
+    const response = await service.analytics(
+      'user',
+      'account',
+      '2026-01-14',
+      '2026-01-16',
+    );
+    expect(response.data?.buckets).toEqual([
+      {
+        period: { from: '2026-01-14', to: '2026-01-14' },
+        totalsByCurrency: [expect.objectContaining({
+          total: { currency: 'RUB', value: '0.1' },
+        })],
+      },
+      {
+        period: { from: '2026-01-15', to: '2026-01-15' },
+        totalsByCurrency: [expect.objectContaining({
+          coupon: { currency: 'RUB', value: '0.2' },
+          dividend: { currency: 'RUB', value: '-0.1' },
+          total: { currency: 'RUB', value: '0.1' },
+        })],
+      },
+      {
+        period: { from: '2026-01-16', to: '2026-01-16' },
+        totalsByCurrency: [],
+      },
+    ]);
+  });
+
   it('aggregates only exact coupon and dividend payments by source currency', async () => {
     operations.collectRanges.mockImplementation(
       (

src/modules/investments/income/income-analytics.service.ts

@@ -232,13 +232,16 @@ function buckets(
   granularity: IncomeBucketGranularity,
   entries: BrokerageOperationDto[],
 ) {
+  const datedEntries = entries.map((entry) => ({
+    entry,
+    date: moscowDate(new Date(entry.occurredAt)),
+  }));
   return rangeBuckets(range, granularity).map((period) => ({
     period,
     totalsByCurrency: totals(
-      entries.filter((entry) => {
+      datedEntries
-        const date = moscowDate(new Date(entry.occurredAt));
+        .filter(({ date }) => date >= period.from && date <= period.to)
-        return date >= period.from && date <= period.to;
+        .map(({ entry }) => entry),
-      }),
     ),
   }));
 }