diff --git a/packages/db/src/services/chart-sql.test.ts b/packages/db/src/services/chart-sql.test.ts
index f9c997a7e..95542d51e 100644
--- a/packages/db/src/services/chart-sql.test.ts
+++ b/packages/db/src/services/chart-sql.test.ts
@@ -13,7 +13,7 @@
  */
 import type { IChartBreakdown, IChartEvent } from '@openpanel/validation';
 import { afterAll, beforeAll, describe, expect, it, vi } from 'vitest';
-import { ch } from '../clickhouse/client';
+import { ch, formatClickhouseDate } from '../clickhouse/client';
 import {
   getAggregateChartSql as _getAggregateChartSql,
   getChartSql as _getChartSql,
@@ -713,3 +713,39 @@ describe('chart.service / single-pass total_count', () => {
     await explain(sql);
   });
 });
+
+describe('chart.service / profile event window', () => {
+  for (const [name, build] of [
+    ['timeseries', getChartSql],
+    ['aggregate', getAggregateChartSql],
+  ] as const) {
+    it(`${name} restricts profile reads to the same project, event and dates`, async () => {
+      const sql = await build({
+        event: event(),
+        breakdowns: [breakdown('profile.properties.plan')],
+        interval: 'day',
+        startDate: '2026-09-01 00:00:00',
+        endDate: '2026-09-02 00:00:00',
+        projectId: PROJECT_ID,
+        timezone: 'UTC',
+      });
+      expect(sql).toContain(`id IN (SELECT profile_id FROM events WHERE project_id = '${PROJECT_ID}' AND created_at >= toDateTime('${formatClickhouseDate('2026-09-01 00:00:00')}') AND created_at <= toDateTime('${formatClickhouseDate('2026-09-02 00:00:00')}') AND name = ('screen_view'))`);
+      expect(sql).toContain('FROM profiles FINAL');
+      if (chReachable) await explain(sql);
+    });
+
+    it(`${name} keeps all event names for wildcard series`, async () => {
+      const sql = await build({
+        event: event({ name: '*' }),
+        breakdowns: [breakdown('profile.properties.plan')],
+        interval: 'day',
+        startDate: '',
+        endDate: '',
+        projectId: PROJECT_ID,
+        timezone: 'UTC',
+      });
+      expect(sql).toContain(`id IN (SELECT profile_id FROM events WHERE project_id = '${PROJECT_ID}')`);
+      expect(sql).not.toContain("name = '*'");
+    });
+  }
+});
diff --git a/packages/db/src/services/chart.service.ts b/packages/db/src/services/chart.service.ts
index 3e121c11e..b2ccd4020 100644
--- a/packages/db/src/services/chart.service.ts
+++ b/packages/db/src/services/chart.service.ts
@@ -9,7 +9,8 @@ import {
   type IReportInput,
 } from '@openpanel/validation';
 import sqlstring from 'sqlstring';
-import { formatClickhouseDate, TABLE_NAMES } from '../clickhouse/client';
+import { ch, formatClickhouseDate, TABLE_NAMES } from '../clickhouse/client';
+import { clix } from '../clickhouse/query-builder';
 import { db } from '../prisma-client';
 import { createSqlBuilder } from '../sql-builder';
 import { buildTypedClause, hasTypedCast, isTypedOperator } from './filter-cast';
@@ -462,6 +463,30 @@ export function rewriteProfilePropertyRefs(sql: string, keys: string[]): string
   return out;
 }
 
+function profileEventWindow({
+  projectId,
+  startDate,
+  endDate,
+  event,
+}: Pick<IGetChartDataInput, 'projectId' | 'startDate' | 'endDate' | 'event'>) {
+  const query = clix(ch)
+    .select(['profile_id'])
+    .from(TABLE_NAMES.events)
+    .where('project_id', '=', projectId);
+  if (startDate) {
+    query.where('created_at', '>=', clix.datetime(startDate, 'toDateTime'));
+  }
+  if (endDate) {
+    query.where('created_at', '<=', clix.datetime(endDate, 'toDateTime'));
+  }
+  if (event.name !== '*') {
+    // Event names must remain string literals, even when they look like dates.
+    query.where('name', '=', clix.exp(sqlstring.escape(event.name)));
+  }
+  // Filter by the join key before FINAL without excluding profiles updated outside the event window.
+  return `id IN (${query.toSQL()})`;
+}
+
 export async function getChartSql({
   event,
   breakdowns: initialBreakdowns,
@@ -691,7 +716,8 @@ export async function getChartSql({
       'profile',
       `SELECT ${selectFields.join(', ')}
       FROM ${TABLE_NAMES.profiles} FINAL
-      WHERE project_id = ${sqlstring.escape(projectId)}`
+      WHERE project_id = ${sqlstring.escape(projectId)}
+      AND ${profileEventWindow({ projectId, startDate, endDate, event })}`
     );
 
     // Use the CTE reference in the main query
@@ -1073,7 +1099,8 @@ export async function getAggregateChartSql({
       'profile',
       `SELECT ${selectFields.join(', ')}
       FROM ${TABLE_NAMES.profiles} FINAL
-      WHERE project_id = ${sqlstring.escape(projectId)}`
+      WHERE project_id = ${sqlstring.escape(projectId)}
+      AND ${profileEventWindow({ projectId, startDate, endDate, event })}`
     );
 
     sb.joins.profiles = profilesJoinRef;