diff --git a/web/src/pages/Content.test.tsx b/web/src/pages/Content.test.tsx
index d60f7618..9beb793e 100644
--- a/web/src/pages/Content.test.tsx
+++ b/web/src/pages/Content.test.tsx
@@ -1,4 +1,10 @@
-import { fireEvent, render, screen, waitFor } from '@testing-library/react'
+import {
+  fireEvent,
+  render,
+  screen,
+  waitFor,
+  within,
+} from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
 import { QueryClientProvider } from '@tanstack/react-query'
 import { expect, it, vi } from 'vitest'
@@ -7,7 +13,8 @@ import { createQueryClient } from '@/lib/query'
 import { authKey } from '@/lib/auth'
 import { authenticated } from '@/test/fixtures'
 
-it('saves rules without caching patterns and tests a sample without retaining it', async () => {
+it('adds, tests and saves rules without randomUUID or retaining patterns and samples', async () => {
+  vi.stubGlobal('crypto', {})
   const client = createQueryClient()
   client.setQueryData(authKey, authenticated)
   const saved: unknown[] = []
@@ -98,6 +105,55 @@ it('saves rules without caching patterns and tests a sample without retaining it
   expect(screen.queryByDisplayValue('SYNTHETIC_SECRET')).toBeNull()
 })
 
+it('keeps drafts independent when removing and adding rules', async () => {
+  const client = createQueryClient()
+  client.setQueryData(authKey, authenticated)
+  vi.stubGlobal(
+    'fetch',
+    vi.fn(() =>
+      Promise.resolve(
+        new Response(JSON.stringify({ mode: 'off', revision: 0, rules: [] })),
+      ),
+    ),
+  )
+  render(
+    <QueryClientProvider client={client}>
+      <Content />
+    </QueryClientProvider>,
+  )
+  const user = userEvent.setup()
+  await user.click(
+    await screen.findByRole('button', { name: 'Configure rules' }),
+  )
+  for (const name of ['Discarded draft', 'Retained draft']) {
+    await user.click(screen.getByRole('button', { name: 'Add rule' }))
+    const draft = within(screen.getByRole('group', { name: 'New rule' }))
+    await user.type(draft.getByLabelText('Rule name'), name)
+    await user.type(draft.getByLabelText('Matching content'), name)
+  }
+  const retained = within(screen.getByRole('group', { name: 'Retained draft' }))
+  await user.type(retained.getByLabelText('Test sample'), 'SYNTHETIC_SAMPLE')
+  await user.click(
+    within(screen.getByRole('group', { name: 'Discarded draft' })).getByRole(
+      'button',
+      { name: 'Remove rule' },
+    ),
+  )
+  await user.click(screen.getByRole('button', { name: 'Add rule' }))
+  const replacement = within(screen.getByRole('group', { name: 'New rule' }))
+  await user.type(replacement.getByLabelText('Rule name'), 'Replacement draft')
+  await user.type(replacement.getByLabelText('Matching content'), 'REPLACEMENT')
+  expect(
+    (retained.getByLabelText('Matching content') as HTMLInputElement).value,
+  ).toBe('Retained draft')
+  expect(
+    (retained.getByLabelText('Test sample') as HTMLTextAreaElement).value,
+  ).toBe('SYNTHETIC_SAMPLE')
+  await user.click(replacement.getByRole('button', { name: 'Remove rule' }))
+  expect(screen.getAllByLabelText('Rule name')).toHaveLength(1)
+  expect(screen.getByRole('group', { name: 'Retained draft' })).toBeTruthy()
+})
+
 it('preserves a saved pattern on metadata edits and reports stale configuration', async () => {
   const client = createQueryClient()
   client.setQueryData(authKey, authenticated)
diff --git a/web/src/pages/Content.tsx b/web/src/pages/Content.tsx
index 19805b87..a3e0a7e8 100644
--- a/web/src/pages/Content.tsx
+++ b/web/src/pages/Content.tsx
@@ -1,4 +1,4 @@
-import { useId, useState, type FormEvent } from 'react'
+import { useId, useRef, useState, type FormEvent } from 'react'
 import { useQuery, useQueryClient } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
 import {
@@ -389,6 +389,8 @@ function ContentEditor({
   const [rules, setRules] = useState<Draft[]>(() =>
     value.rules.map((rule) => ({ ...rule, draftID: rule.id, pattern: '' })),
   )
+  // Local, monotonic keys work over HTTP and never reuse deleted rows' state.
+  const nextRuleID = useRef(0)
   const save = useAdminMutation({
     userID,
     mutationFn: saveContent,
@@ -447,11 +449,12 @@ function ContentEditor({
                 type="button"
                 variant="outline"
                 disabled={rules.length >= 50}
-                onClick={() =>
+                onClick={() => {
+                  const draftID = `new-${nextRuleID.current++}`
                   setRules((current) => [
                     ...current,
                     {
-                      draftID: crypto.randomUUID(),
+                      draftID,
                       id: '',
                       name: '',
                       kind: 'text',
@@ -459,7 +462,7 @@ function ContentEditor({
                       pattern: '',
                     },
                   ])
-                }
+                }}
               >
                 <Plus className="size-4" aria-hidden="true" />
                 {t('contentAdd')}