diff --git a/api/services/annotation_service.py b/api/services/annotation_service.py
index 7efa26803a2..317ada53d89 100644
--- a/api/services/annotation_service.py
+++ b/api/services/annotation_service.py
@@ -536,7 +536,7 @@ class AppAnnotationService:
             if dify_config.DEPLOYMENT_EDITION == DeploymentEdition.CLOUD:
                 features = FeatureService.get_features(current_tenant_id, exclude_vector_space=True)
                 annotation_quota_limit = features.annotation_quota_limit
-                if annotation_quota_limit.limit < len(result) + annotation_quota_limit.size:
+                if 0 < annotation_quota_limit.limit < len(result) + annotation_quota_limit.size:
                     raise ValueError("The number of annotations exceeds the limit of your subscription.")
             # async job
             job_id = str(uuid.uuid4())
diff --git a/api/tests/unit_tests/services/test_annotation_service.py b/api/tests/unit_tests/services/test_annotation_service.py
index 8e5c305fa34..ac2a69b0f40 100644
--- a/api/tests/unit_tests/services/test_annotation_service.py
+++ b/api/tests/unit_tests/services/test_annotation_service.py
@@ -719,6 +719,29 @@ class TestAppAnnotationServiceBatchImport:
             "uuid-3", [{"question": "q1", "answer": "a1"}], app.id, TENANT_ID, current_user.id
         )
 
+    @pytest.mark.parametrize("limit", [0, 2], ids=["unlimited", "exactly-at-limit"])
+    @config_overrides_context(DEPLOYMENT_EDITION=DeploymentEdition.CLOUD)
+    def test_import_with_available_quota_enqueues_job(
+        self, sqlite_session: Session, current_user: Account, limit: int
+    ) -> None:
+        app = _persist_app(sqlite_session)
+        features = SimpleNamespace(annotation_quota_limit=SimpleNamespace(limit=limit, size=1))
+        with (
+            patch.object(annotation_service_module.FeatureService, "get_features", return_value=features),
+            patch.object(annotation_service_module, "batch_import_annotations_task") as task,
+            patch.object(annotation_service_module, "redis_client"),
+            config_overrides_context(ANNOTATION_IMPORT_MAX_RECORDS=5, ANNOTATION_IMPORT_MIN_RECORDS=1),
+        ):
+            result = AppAnnotationService.batch_import_app_annotations(
+                app.id, _file(b"question,answer\nq,a\n"), sqlite_session
+            )
+
+        assert result["job_status"] == "waiting"
+        assert result["record_count"] == 1
+        task.delay.assert_called_once_with(
+            result["job_id"], [{"question": "q", "answer": "a"}], app.id, TENANT_ID, current_user.id
+        )
+
     @config_overrides_context(DEPLOYMENT_EDITION=DeploymentEdition.COMMUNITY)
     def test_unexpected_error_cleans_active_job(
         self, sqlite_session: Session, current_user: Account, caplog: pytest.LogCaptureFixture
diff --git a/web/app/components/billing/__tests__/query-state.spec.tsx b/web/app/components/billing/__tests__/query-state.spec.tsx
index 07b3084caee..1f26eba6520 100644
--- a/web/app/components/billing/__tests__/query-state.spec.tsx
+++ b/web/app/components/billing/__tests__/query-state.spec.tsx
@@ -1,10 +1,13 @@
-import { act, render, screen, within } from '@testing-library/react'
+import { act, render, screen, waitFor, within } from '@testing-library/react'
+import userEvent from '@testing-library/user-event'
+import { ModalContextProvider } from '@/context/modal-context-provider'
 import { consoleQuery } from '@/service/client'
 import {
   createConsoleQueryClient,
   createConsoleQueryWrapper,
   seedFeatures,
 } from '@/test/console/query-data'
+import { createNuqsTestWrapper } from '@/test/nuqs-testing'
 import AnnotationUsage from '../annotation-full/usage'
 import Billing from '../billing-page'
 
@@ -75,3 +78,73 @@ it('renders annotation usage only from returned data and preserves zero as an un
   expect(within(annotation).getByText('4')).toBeInTheDocument()
   expect(within(annotation).getByText('billing.plansCommon.unlimited')).toBeInTheDocument()
 })
+
+it.each([
+  { limit: 0, usage: 0, percent: 100 },
+  { limit: -1, usage: 25, percent: 0 },
+  { limit: 100, usage: 25, percent: 25 },
+  { limit: 100, usage: 100, percent: 100 },
+])(
+  'renders event and API quotas with limit $limit and usage $usage',
+  async ({ limit, usage, percent }) => {
+    const { queryClient, wrapper } = createConsoleQueryWrapper({
+      systemFeatures: { deployment_edition: 'CLOUD' },
+      features: {
+        trigger_event: { limit, usage },
+        api_rate_limit: { limit, usage },
+        apps: { size: 4, limit: 0 },
+      },
+    })
+    queryClient.setQueryData(consoleQuery.features.vectorSpace.get.queryKey(), {
+      size: 256,
+      limit: 900,
+      usage_unknown: false,
+    })
+    render(<Billing />, { wrapper })
+
+    for (const name of ['billing.usagePage.triggerEvents', 'billing.plansCommon.apiRateLimit']) {
+      const quota = within(await screen.findByRole('group', { name }))
+      expect(quota.getByTestId('billing-quota-value')).toHaveTextContent(
+        `${usage}/${limit === -1 ? 'billing.plansCommon.unlimited' : limit}`,
+      )
+      expect(quota.getByRole('meter', { name })).toHaveAttribute('aria-valuenow', String(percent))
+      if (limit !== -1)
+        expect(quota.queryByText('billing.plansCommon.unlimited')).not.toBeInTheDocument()
+    }
+
+    const apps = within(screen.getByRole('group', { name: 'billing.usagePage.buildApps' }))
+    expect(apps.getByText('billing.plansCommon.unlimited')).toBeInTheDocument()
+  },
+)
+
+it('shows a dismissible limit dialog when the workspace receives a zero event quota', async () => {
+  localStorage.clear()
+  const user = userEvent.setup()
+  const { queryClient, wrapper } = createConsoleQueryWrapper({
+    systemFeatures: { deployment_edition: 'CLOUD' },
+    currentWorkspace: { id: 'workspace-zero-quota' },
+  })
+  const { wrapper: NuqsWrapper } = createNuqsTestWrapper()
+  render(
+    <NuqsWrapper>
+      <ModalContextProvider>
+        <span>Workspace</span>
+      </ModalContextProvider>
+    </NuqsWrapper>,
+    { wrapper },
+  )
+
+  expect(screen.queryByRole('dialog')).not.toBeInTheDocument()
+  await act(async () => {
+    seedFeatures(queryClient, {
+      billing: { subscription: { plan: 'professional' } },
+      trigger_event: { limit: 0, usage: 0, reset_date: -1 },
+    })
+  })
+  const dialog = await screen.findByRole('dialog', { name: 'billing.triggerLimitModal.title' })
+  expect(within(dialog).getByTestId('billing-quota-value')).toHaveTextContent('0/0')
+  await user.click(
+    within(dialog).getByRole('button', { name: 'billing.triggerLimitModal.dismiss' }),
+  )
+  await waitFor(() => expect(screen.queryByRole('dialog')).not.toBeInTheDocument())
+})
diff --git a/web/app/components/billing/plan/index.tsx b/web/app/components/billing/plan/index.tsx
index 783693472a4..6a4b83aadc0 100644
--- a/web/app/components/billing/plan/index.tsx
+++ b/web/app/components/billing/plan/index.tsx
@@ -19,7 +19,7 @@ import { NUM_INFINITE } from '../config'
 import { useEducationDiscount } from '../hooks/use-education-discount'
 import UpgradeBtn from '../upgrade-btn'
 import VectorSpaceInfo from '../usage-info/vector-space-info'
-import { getResetInDaysFromDate, parseLimit, parseRateLimit } from '../utils'
+import { getResetInDaysFromDate, parseLimit } from '../utils'
 import { Professional, Sandbox, Team } from './assets'
 
 type Props = Readonly<{
@@ -49,8 +49,8 @@ const PlanComp: FC<Props> = ({ loc }) => {
   )
   const { isAboutToExpire = false, isEducationAccount = false } = educationStatus ?? {}
   const type = features.billing.subscription.plan
-  const triggerEventsLimit = parseRateLimit(features.trigger_event.limit)
-  const apiRateLimit = parseRateLimit(features.api_rate_limit.limit)
+  const triggerEventsLimit = features.trigger_event.limit
+  const apiRateLimit = features.api_rate_limit.limit
   const apiRateLimitReset = getResetInDaysFromDate(features.api_rate_limit.reset_date)
   const triggerEventsResetInDays =
     type === 'professional' && triggerEventsLimit !== NUM_INFINITE
diff --git a/web/app/components/billing/usage-info/index.tsx b/web/app/components/billing/usage-info/index.tsx
index d71507ca02c..3aed8589b50 100644
--- a/web/app/components/billing/usage-info/index.tsx
+++ b/web/app/components/billing/usage-info/index.tsx
@@ -52,11 +52,10 @@ const UsageInfo: FC<Props> = ({
   const isBelowThreshold = !usageUnknown && storageMode && usage < storageThreshold
   const isSandboxFull = !usageUnknown && storageMode && isSandboxPlan && usage >= storageThreshold
 
-  // Single source of truth: sandbox full is visually clamped to 100%; all other
-  // determinate cases show the real percent capped at 100. Tone derives from
-  // this, so we never need a separate tone override.
+  // Zero count quotas have no remaining capacity; storage keeps its separate limit convention.
+  const isZeroQuota = !storageMode && total === 0
   const rawPercent = total > 0 ? (usage / total) * 100 : 0
-  const effectivePercent = isSandboxFull ? 100 : Math.min(rawPercent, 100)
+  const effectivePercent = isSandboxFull || isZeroQuota ? 100 : Math.min(rawPercent, 100)
   const tone: MeterTone =
     effectivePercent >= 100 ? 'error' : effectivePercent >= 80 ? 'warning' : 'neutral'
 
diff --git a/web/app/components/billing/utils/__tests__/index.spec.ts b/web/app/components/billing/utils/__tests__/index.spec.ts
index e910ac13abd..d728b1bf8a9 100644
--- a/web/app/components/billing/utils/__tests__/index.spec.ts
+++ b/web/app/components/billing/utils/__tests__/index.spec.ts
@@ -2,7 +2,6 @@ import {
   getPlanVectorSpaceLimitMB,
   getResetInDaysFromDate,
   parseLimit,
-  parseRateLimit,
   parseVectorSpaceToMB,
 } from '../index'
 
@@ -71,10 +70,5 @@ describe('billing utils', () => {
       expect(parseLimit(0)).toBe(-1)
       expect(parseLimit(10)).toBe(10)
     })
-    it('preserves unlimited rate limits in either API representation', () => {
-      expect(parseRateLimit(0)).toBe(-1)
-      expect(parseRateLimit(-1)).toBe(-1)
-      expect(parseRateLimit(5000)).toBe(5000)
-    })
   })
 })
diff --git a/web/app/components/billing/utils/index.ts b/web/app/components/billing/utils/index.ts
index ce8791d49ae..740da620893 100644
--- a/web/app/components/billing/utils/index.ts
+++ b/web/app/components/billing/utils/index.ts
@@ -23,19 +23,14 @@ export const getPlanVectorSpaceLimitMB = (planType: CloudPlan): number => {
   return parseVectorSpaceToMB(ALL_PLANS[planType].vectorSpace)
 }
 
-// The API uses 0 for unlimited count quotas.
+// App, member, document upload, and annotation quotas use 0 for unlimited.
+// Event and API quotas use -1 for unlimited and must preserve 0 as zero capacity.
 export const parseLimit = (limit: number) => {
   if (limit === 0) return NUM_INFINITE
 
   return limit
 }
 
-export const parseRateLimit = (limit: number) => {
-  if (limit === 0 || limit === -1) return NUM_INFINITE
-
-  return limit
-}
-
 const normalizeResetDate = (resetDate: number) => {
   if (resetDate <= 0) return null
 
diff --git a/web/context/hooks/use-trigger-events-limit-modal.ts b/web/context/hooks/use-trigger-events-limit-modal.ts
index da90ee8ae41..0ea3aa44c1f 100644
--- a/web/context/hooks/use-trigger-events-limit-modal.ts
+++ b/web/context/hooks/use-trigger-events-limit-modal.ts
@@ -48,7 +48,7 @@ export const useTriggerEventsLimitModal = (): UseTriggerEventsLimitModalResult =
     currentWorkspaceId &&
     quota &&
     quota.plan !== 'team' &&
-    quota.limit > 0 &&
+    quota.limit >= 0 &&
     quota.usage >= quota.limit
       ? `${TRIGGER_EVENTS_LOCALSTORAGE_PREFIX}-${currentWorkspaceId}-${quota.plan}-${quota.limit}-${cycleTag}`
       : null