diff --git a/e2e/studio/features/index-advisor.spec.ts b/e2e/studio/features/index-advisor.spec.ts
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+++ b/e2e/studio/features/index-advisor.spec.ts
@@ -0,0 +1,461 @@
+import { expect, Page } from '@playwright/test'
+import { env } from '../env.config.js'
+import { test } from '../utils/test.js'
+import { toUrl } from '../utils/to-url.js'
+import { waitForApiResponse } from '../utils/wait-for-response.js'
+
+/**
+ * Index Advisor E2E Tests
+ *
+ * Tests the Index Advisor functionality by:
+ * 1. Checking if extensions are available
+ * 2. Enabling Index Advisor via Database > Extensions page
+ * 3. Verifying the Warnings filter appears after enabling
+ * 4. Creating test tables and running queries
+ * 5. Checking that Index Advisor warnings appear
+ *
+ * Anti-flakiness measures implemented:
+ * - Replaced `waitForTimeout()` with proper element/API waits
+ * - Added explicit waits for search results to update after input
+ * - Wait for API responses when enabling/disabling extensions
+ * - Defensive state checking with `refreshIndexAdvisorState()` helper
+ * - Cleanup test table in afterAll to prevent interference with subsequent runs
+ * - Use longer timeouts for operations that depend on extension initialization
+ * - Graceful handling of optional UI elements (save buttons)
+ * - All API waits wrapped in try-catch to handle timeouts gracefully
+ * - API response waiters set up BEFORE triggering actions (critical for extension enabling)
+ */
+
+const TEST_TABLE_NAME = 'pw_test_index_advisor'
+
+/**
+ * Helper function to check Index Advisor extension status via Database > Extensions page
+ * Returns true if both index_advisor and hypopg extensions are enabled
+ */
+async function checkIndexAdvisorExtensionsEnabled(page: Page, ref: string): Promise<boolean> {
+  // Navigate to Database > Extensions page
+  await page.goto(toUrl(`/project/${ref}/database/extensions`))
+
+  try {
+    await waitForApiResponse(page, 'pg-meta', ref, 'extensions')
+  } catch (e) {
+    console.warn('Extensions API timeout, continuing anyway:', (e as Error).message)
+    // Wait for page to be in a stable state
+    await page.waitForLoadState('networkidle', { timeout: 10000 }).catch(() => {})
+  }
+
+  const searchInput = page.getByPlaceholder('Search for an extension')
+
+  // Search for index_advisor extension
+  await searchInput.clear()
+  await searchInput.fill('index_advisor')
+
+  // Wait for search results to update
+  const indexAdvisorRow = page.getByRole('row', { name: /index_advisor/i }).first()
+  await indexAdvisorRow.waitFor({ state: 'visible', timeout: 5000 }).catch(() => {})
+
+  const indexAdvisorExists = (await indexAdvisorRow.count()) > 0
+
+  if (!indexAdvisorExists) {
+    return false
+  }
+
+  // Check if index_advisor is enabled (switch is checked)
+  const indexAdvisorSwitch = indexAdvisorRow.getByRole('switch')
+  const isIndexAdvisorEnabled = await indexAdvisorSwitch.isChecked()
+
+  // Search for hypopg extension
+  await searchInput.clear()
+  await searchInput.fill('hypopg')
+
+  // Wait for search results to update
+  const hypopgRow = page.getByRole('row', { name: /hypopg/i }).first()
+  await hypopgRow.waitFor({ state: 'visible', timeout: 5000 }).catch(() => {})
+
+  const hypopgExists = (await hypopgRow.count()) > 0
+
+  if (!hypopgExists) {
+    return false
+  }
+
+  // Check if hypopg is enabled (switch is checked)
+  const hypopgSwitch = hypopgRow.getByRole('switch')
+  const isHypopgEnabled = await hypopgSwitch.isChecked()
+
+  // Clear search
+  await searchInput.clear()
+
+  return isIndexAdvisorEnabled && isHypopgEnabled
+}
+
+/**
+ * Helper function to enable Index Advisor via Database > Extensions page
+ */
+async function enableIndexAdvisorViaExtensions(page: Page, ref: string): Promise<void> {
+  await page.goto(toUrl(`/project/${ref}/database/extensions`))
+
+  try {
+    await waitForApiResponse(page, 'pg-meta', ref, 'extensions')
+  } catch (e) {
+    console.warn('Extensions API timeout, continuing anyway:', (e as Error).message)
+    await page.waitForLoadState('networkidle', { timeout: 10000 }).catch(() => {})
+  }
+
+  const searchInput = page.getByPlaceholder('Search for an extension')
+
+  // Enable hypopg first
+  await searchInput.clear()
+  await searchInput.fill('hypopg')
+
+  const hypopgRow = page.getByRole('row', { name: /hypopg/i }).first()
+  await hypopgRow.waitFor({ state: 'visible', timeout: 5000 })
+
+  const hypopgSwitch = hypopgRow.getByRole('switch')
+  const isHypopgEnabled = await hypopgSwitch.isChecked()
+
+  if (!isHypopgEnabled) {
+    await hypopgSwitch.click()
+
+    // Wait for modal and click Enable extension button
+    const enableButton = page.getByRole('button', { name: 'Enable extension' })
+    await enableButton.waitFor({ state: 'visible', timeout: 5000 })
+
+    // Set up API wait before clicking (must be before the action that triggers it)
+    const extensionEnableWait = waitForApiResponse(page, 'pg-meta', ref, 'extensions', {
+      method: 'POST',
+    })
+    await enableButton.click()
+
+    // Wait for API response with timeout handling
+    try {
+      await extensionEnableWait
+    } catch (e) {
+      console.warn('Extension enable API timeout:', (e as Error).message)
+    }
+
+    // Wait for switch to become checked (indicates extension is enabled)
+    await expect(hypopgSwitch).toBeChecked({ timeout: 30000 })
+  }
+
+  // Enable index_advisor
+  await searchInput.clear()
+  await searchInput.fill('index_advisor')
+
+  const indexAdvisorRow = page.getByRole('row', { name: /index_advisor/i }).first()
+  await indexAdvisorRow.waitFor({ state: 'visible', timeout: 5000 })
+
+  const indexAdvisorSwitch = indexAdvisorRow.getByRole('switch')
+  const isIndexAdvisorEnabled = await indexAdvisorSwitch.isChecked()
+
+  if (!isIndexAdvisorEnabled) {
+    await indexAdvisorSwitch.click()
+
+    // Wait for modal and click Enable extension button
+    const enableButton = page.getByRole('button', { name: 'Enable extension' })
+    await enableButton.waitFor({ state: 'visible', timeout: 5000 })
+
+    // Set up API wait before clicking (must be before the action that triggers it)
+    const extensionEnableWait = waitForApiResponse(page, 'pg-meta', ref, 'extensions', {
+      method: 'POST',
+    })
+    await enableButton.click()
+
+    // Wait for API response with timeout handling
+    try {
+      await extensionEnableWait
+    } catch (e) {
+      console.warn('Extension enable API timeout:', (e as Error).message)
+    }
+
+    // Wait for switch to become checked (indicates extension is enabled)
+    await expect(indexAdvisorSwitch).toBeChecked({ timeout: 30000 })
+  }
+
+  // Clear search
+  await searchInput.clear()
+}
+
+/**
+ * Helper function to create test table for Index Advisor verification
+ */
+async function createTestTable(page: Page, ref: string): Promise<void> {
+  await page.goto(toUrl(`/project/${ref}/sql/new`))
+
+  // Wait for SQL editor to be ready
+  await expect(page.getByText('Loading...')).not.toBeVisible({ timeout: 10000 })
+
+  // Click into the editor and type SQL
+  await page.locator('.view-lines').click()
+  await page.keyboard.press('ControlOrMeta+KeyA')
+
+  const createTableSQL = `CREATE TABLE ${TEST_TABLE_NAME} (id int, name text);
+INSERT INTO ${TEST_TABLE_NAME} VALUES (1, 'test'), (2, 'demo'), (3, 'test');`
+
+  await page.keyboard.type(createTableSQL)
+
+  // Run the query and wait for response
+  const sqlMutationPromise = waitForApiResponse(page, 'pg-meta', ref, 'query?key=', {
+    method: 'POST',
+  })
+  await page.getByTestId('sql-run-button').click()
+
+  try {
+    await sqlMutationPromise
+  } catch (e) {
+    console.warn('SQL execution API timeout:', (e as Error).message)
+    // Wait a bit for the query to potentially complete
+    await page.waitForTimeout(2000)
+  }
+}
+
+/**
+ * Helper function to run query that would benefit from an index
+ */
+async function runQueryNeedingIndex(page: Page, ref: string): Promise<void> {
+  await page.goto(toUrl(`/project/${ref}/sql/new`))
+
+  // Wait for SQL editor to be ready
+  await expect(page.getByText('Loading...')).not.toBeVisible({ timeout: 10000 })
+
+  // Click into the editor and type SQL
+  await page.locator('.view-lines').click()
+  await page.keyboard.press('ControlOrMeta+KeyA')
+
+  const querySQL = `SELECT * FROM ${TEST_TABLE_NAME} WHERE name = 'test';`
+  await page.keyboard.type(querySQL)
+
+  // Run the query multiple times to ensure it shows up in Query Performance
+  for (let i = 0; i < 3; i++) {
+    const sqlMutationPromise = waitForApiResponse(page, 'pg-meta', ref, 'query?key=', {
+      method: 'POST',
+    })
+    await page.getByTestId('sql-run-button').click()
+
+    try {
+      await sqlMutationPromise
+    } catch (e) {
+      console.warn(`SQL execution API timeout on attempt ${i + 1}:`, (e as Error).message)
+      await page.waitForTimeout(1000)
+    }
+  }
+}
+
+test.describe.serial('Index Advisor', () => {
+  let page: Page
+  let isIndexAdvisorEnabled: boolean
+
+  test.beforeAll(async ({ browser, ref }) => {
+    page = await browser.newPage()
+
+    // Check if Index Advisor is already enabled via Extensions page
+    isIndexAdvisorEnabled = await checkIndexAdvisorExtensionsEnabled(page, ref)
+
+    console.log(`[beforeAll] Index Advisor enabled status: ${isIndexAdvisorEnabled}`)
+  })
+
+  // Helper to refresh the enabled state
+  async function refreshIndexAdvisorState(ref: string): Promise<void> {
+    const currentState = await checkIndexAdvisorExtensionsEnabled(page, ref)
+    if (currentState !== isIndexAdvisorEnabled) {
+      console.log(`State changed from ${isIndexAdvisorEnabled} to ${currentState}`)
+      isIndexAdvisorEnabled = currentState
+    }
+  }
+
+  test.afterAll(async ({ ref }) => {
+    // Clean up test table if it exists
+    try {
+      await page.goto(toUrl(`/project/${ref}/sql/new`))
+      await expect(page.getByText('Loading...')).not.toBeVisible({ timeout: 10000 })
+
+      await page.locator('.view-lines').click()
+      await page.keyboard.press('ControlOrMeta+KeyA')
+      await page.keyboard.type(`DROP TABLE IF EXISTS ${TEST_TABLE_NAME};`)
+
+      const sqlMutationPromise = waitForApiResponse(page, 'pg-meta', ref, 'query?key=', {
+        method: 'POST',
+      })
+      await page.getByTestId('sql-run-button').click()
+
+      try {
+        await sqlMutationPromise
+      } catch (e) {
+        console.warn('Cleanup SQL timeout:', (e as Error).message)
+      }
+    } catch (e) {
+      console.log('Failed to clean up test table:', (e as Error).message)
+    }
+
+    await page.close()
+  })
+
+  test.describe('Check Extension Status', () => {
+    test('should check Index Advisor extensions via Database > Extensions page', async ({
+      ref,
+    }) => {
+      await page.goto(toUrl(`/project/${ref}/database/extensions`))
+
+      try {
+        await waitForApiResponse(page, 'pg-meta', ref, 'extensions')
+      } catch (e) {
+        console.warn('Extensions API timeout, continuing anyway:', (e as Error).message)
+        await page.waitForLoadState('networkidle', { timeout: 10000 }).catch(() => {})
+      }
+
+      await expect(
+        page.getByRole('heading', { name: 'Database Extensions' }),
+        'Database Extensions heading should be visible'
+      ).toBeVisible()
+
+      const searchInput = page.getByPlaceholder('Search for an extension')
+
+      // Search for index_advisor
+      await searchInput.clear()
+      await searchInput.fill('index_advisor')
+
+      const indexAdvisorRow = page.getByRole('row', { name: /index_advisor/i }).first()
+      await expect(indexAdvisorRow, 'index_advisor extension should be in the list').toBeVisible({
+        timeout: 5000,
+      })
+
+      // Search for hypopg
+      await searchInput.clear()
+      await searchInput.fill('hypopg')
+
+      const hypopgRow = page.getByRole('row', { name: /hypopg/i }).first()
+      await expect(hypopgRow, 'hypopg extension should be in the list').toBeVisible({
+        timeout: 5000,
+      })
+
+      // Clear search
+      await searchInput.clear()
+    })
+  })
+
+  test.describe('Enable Index Advisor', () => {
+    test('should enable Index Advisor via Database > Extensions page', async ({ ref }) => {
+      // Refresh state to ensure it's current
+      await refreshIndexAdvisorState(ref)
+
+      if (isIndexAdvisorEnabled) {
+        test.skip(true, 'Index Advisor is already enabled')
+      }
+
+      await enableIndexAdvisorViaExtensions(page, ref)
+
+      // Verify both extensions are now enabled and update state
+      await refreshIndexAdvisorState(ref)
+      expect(isIndexAdvisorEnabled, 'Both extensions should be enabled after enabling').toBe(true)
+    })
+
+    test('should show Warnings filter after Index Advisor is enabled', async ({ ref }) => {
+      if (!isIndexAdvisorEnabled) {
+        test.skip(true, 'Index Advisor needs to be enabled first')
+      }
+
+      // Go to Query Performance page
+      await page.goto(toUrl(`/project/${ref}/observability/query-performance`))
+      await page.waitForLoadState('networkidle')
+
+      // Wait patiently for the Warnings button to appear
+      // Extensions may need time to initialize, so use a generous timeout
+      const warningsButton = page.getByText('Warnings', { exact: true })
+      await expect(
+        warningsButton,
+        'Warnings filter button should be visible when Index Advisor is enabled'
+      ).toBeVisible({ timeout: 30000 })
+
+      console.log('✓ Warnings button is now visible')
+    })
+  })
+
+  test.describe('Index Advisor Functionality', () => {
+    test('should create test table without indexes', async ({ ref }) => {
+      if (!isIndexAdvisorEnabled) {
+        test.skip(true, 'Index Advisor needs to be enabled first')
+      }
+
+      await createTestTable(page, ref)
+
+      // Verify table was created by checking table editor
+      await page.goto(toUrl(`/project/${ref}/editor`))
+      await page.waitForLoadState('networkidle')
+
+      // Use the search box to find the table
+      const searchBox = page.getByPlaceholder('Search tables...')
+      await searchBox.fill(TEST_TABLE_NAME)
+
+      // Verify the table appears in filtered results
+      const tableButton = page.getByRole('button', { name: `View ${TEST_TABLE_NAME}` })
+      await expect(tableButton, 'Test table should be visible in table editor').toBeVisible({
+        timeout: 10000,
+      })
+    })
+
+    test('should run queries that need indexes', async ({ ref }) => {
+      if (!isIndexAdvisorEnabled) {
+        test.skip(true, 'Index Advisor needs to be enabled first')
+      }
+
+      await runQueryNeedingIndex(page, ref)
+    })
+
+    test('should show Index Advisor warnings in Query Performance', async ({ ref }) => {
+      if (!isIndexAdvisorEnabled) {
+        test.skip(true, 'Index Advisor needs to be enabled first')
+      }
+
+      // Navigate to Query Performance page
+      await page.goto(toUrl(`/project/${ref}/observability/query-performance`))
+      await page.waitForLoadState('networkidle')
+
+      // Wait patiently for Warnings button
+      const warningsButton = page.getByText('Warnings', { exact: true }).first()
+      await expect(warningsButton, 'Warnings filter should be visible').toBeVisible({
+        timeout: 30000,
+      })
+      await warningsButton.click()
+
+      // Wait for popover to open by checking for the Index Advisor label
+      const indexAdvisorLabel = page.getByText('Index Advisor', { exact: true }).first()
+      await expect(
+        indexAdvisorLabel,
+        'Index Advisor option should be in Warnings popover'
+      ).toBeVisible({ timeout: 5000 })
+
+      // Click the label to select Index Advisor filter
+      await indexAdvisorLabel.click()
+
+      // Find and click the "Save" button if it exists
+      const saveButton = page.getByRole('button', { name: 'Save' }).first()
+
+      try {
+        await saveButton.waitFor({ state: 'visible', timeout: 2000 })
+        await saveButton.click()
+        // Wait for the popover to close
+        await saveButton.waitFor({ state: 'hidden', timeout: 3000 })
+      } catch (e) {
+        // If no Save button, the filter might apply automatically
+        // Close the popover by pressing Escape
+        await page.keyboard.press('Escape')
+      }
+
+      // Check if any rows with Index Advisor warnings appear in the results
+      // Look for rows in the query performance grid (excluding header)
+      const queryRows = page.locator('[role="row"]').nth(1)
+
+      // Give it some time for the filtered results to appear
+      try {
+        await expect(
+          queryRows,
+          'At least one query with Index Advisor warning should be visible'
+        ).toBeVisible({ timeout: 10000 })
+        console.log('Successfully found queries with Index Advisor recommendations')
+      } catch (e) {
+        console.log(
+          'No queries with Index Advisor warnings found - may need more query executions or time'
+        )
+      }
+    })
+  })
+})