feat: demo-data parity for databases and cron tab

Adds demoDatabases fixtures (postgres/redis/clickhouse) wired into
/databases?demo=1 and demoCronJobsByService fixtures for the service
Cron tab, so demo mode no longer renders empty sections on the new
surfaces.

Authored By: TDvorak <[email protected]>

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

ROADMAP.md

@@ -440,9 +440,11 @@ security scans produce real reports, not empty tables.
       events live in process memory — a backend restart wipes them and
       reverts replicas to policy minimums on next registration. Persist
       to Postgres before leaving beta.
-- [ ] **Demo-data parity for new pages**: `demo-data.ts` covers Projects/
-      Templates but the new Databases page and service Cron tab have no demo
-      fixtures — add them so `?demo=1` doesn't show empty sections.
+- [x] **Demo-data parity for new pages**: `demoDatabases` fixture wired
+      into `/databases?demo=1`; `demoCronJobsByService` fixtures wired into
+      the service Cron tab (worker + api demo services). Scaling, Previews,
+      HA and Security sections still show empty in demo mode — acceptable:
+      those are interaction surfaces, not dashboards.
 - [ ] **CI**: GitHub Actions — build, lint, typecheck, tests, compose boot
       smoke; publish container images to GHCR with semver tags.
 - [ ] **Release**: `v1.0.0` tag, changelog, release notes, screenshots refresh

app/frontend/src/features/secondary/pages.tsx

@@ -47,6 +47,7 @@ import {
   type DatabaseEntity,
   type FailoverPolicy,
 } from '@/lib/api-client';
+import { demoDatabases } from '@/lib/demo-data';
 import { formatRelative } from '@/lib/time';
 import { getAuthBaseUrl, signOutAuthSession } from '@/lib/auth-client';
 import { useBuildUpdates } from '@/lib/use-build-updates';
@@ -1535,12 +1536,15 @@ const dbStatusClass: Record<string, string> = {
 
 export function DatabasesPage() {
   const queryClient = useQueryClient();
+  const [searchParams] = useSearchParams();
+  const isDemoMode = searchParams.get('demo') === '1';
   const [expandedId, setExpandedId] = useState<string | null>(null);
   const [bindDb, setBindDb] = useState<DatabaseEntity | null>(null);
   const databasesQuery = useQuery({
     queryKey: ['databases'],
     queryFn: listDatabases,
     refetchInterval: 15_000,
+    enabled: !isDemoMode,
   });
 
   const invalidate = () => queryClient.invalidateQueries({ queryKey: ['databases'] });
@@ -1559,7 +1563,7 @@ export function DatabasesPage() {
     onSuccess: () => window.setTimeout(invalidate, 3000),
   });
 
-  const databases = databasesQuery.data ?? [];
+  const databases = isDemoMode ? demoDatabases : databasesQuery.data ?? [];
 
   return (
     <div>

app/frontend/src/features/service/pages/ServiceDetailPage.tsx

@@ -30,7 +30,7 @@ import {
   updateServiceVariables,
   type CronJobEntity,
 } from '@/lib/api-client';
-import { getDemoProjectById, getDemoServiceById } from '@/lib/demo-data';
+import { getDemoProjectById, getDemoServiceById, getDemoCronJobsByService } from '@/lib/demo-data';
 import { parseDotenv, validateVariableRows, type VariableDraft } from '../variable-utils';
 import { formatBytes, formatDate, formatRelative, seededMetric } from '@/lib/time';
 import { EnhancedMetricCard, LineAreaChart, DonutChart } from '@/shared/components';
@@ -1290,14 +1290,14 @@ export function ServiceDetailPage() {
               <div className="flex items-center justify-center py-12 text-[var(--text-muted)]">
                 <Loader2 size={20} className="animate-spin" />
               </div>
-            ) : (cronJobsQuery.data ?? []).length === 0 ? (
+            ) : (isDemoMode ? getDemoCronJobsByService(serviceId) : cronJobsQuery.data ?? []).length === 0 ? (
               <div className="panel-soft p-8 text-center">
                 <p className="text-sm text-[var(--text-secondary)]">No cron jobs configured.</p>
                 <p className="mt-1 text-xs text-[var(--text-muted)]">Create a job to run commands on a schedule inside this service's container.</p>
               </div>
             ) : (
               <div className="space-y-2">
-                {(cronJobsQuery.data ?? []).map((job) => (
+                {(isDemoMode ? getDemoCronJobsByService(serviceId) : cronJobsQuery.data ?? []).map((job) => (
                   <div key={job.id} className="panel-soft p-3">
                     <div className="flex items-center gap-3">
                       <button

app/frontend/src/lib/demo-data.ts

@@ -1,4 +1,4 @@
-import type { ProjectEntity, ServiceEntity } from '@/lib/api-client';
+import type { CronJobEntity, DatabaseEntity, ProjectEntity, ServiceEntity } from '@/lib/api-client';
 import type { ServiceVariable } from '@/features/workspace/auto-connections';
 
 export const demoProjects: ProjectEntity[] = [
@@ -231,3 +231,101 @@ export function getDemoServiceById(serviceId: string): ServiceEntity | undefined
 export function getDemoVariablesByProject(projectId: string): Record<string, ServiceVariable[]> {
   return demoVariablesByProject[projectId] ?? {};
 }
+
+export const demoDatabases: DatabaseEntity[] = [
+  {
+    id: 'demo-db-postgres',
+    name: 'core-postgres',
+    type: 'postgresql',
+    status: 'running',
+    connection_url: 'postgres://demo:***@core-postgres.internal:5432/app',
+    version: '16.4',
+    plan: 'standard',
+    region: 'local',
+    backup_schedule: '0 3 * * *',
+    next_backup_at: '2026-04-01T03:00:00Z',
+    created_at: '2026-03-12T10:05:00Z',
+  },
+  {
+    id: 'demo-db-redis',
+    name: 'cache-redis',
+    type: 'redis',
+    status: 'running',
+    connection_url: 'redis://:***@cache-redis.internal:6379',
+    version: '7.4',
+    plan: 'hobby',
+    region: 'local',
+    created_at: '2026-03-12T10:12:00Z',
+  },
+  {
+    id: 'demo-db-analytics',
+    name: 'analytics-clickhouse',
+    type: 'clickhouse',
+    status: 'stopped',
+    connection_url: 'clickhouse://analytics.internal:9000/default',
+    version: '25.3',
+    plan: 'business',
+    region: 'local',
+    created_at: '2026-02-18T08:00:00Z',
+  },
+];
+
+export const demoCronJobsByService: Record<string, CronJobEntity[]> = {
+  'demo-svc-worker': [
+    {
+      id: 'demo-cron-cleanup',
+      project_id: 'demo-project-core',
+      service_id: 'demo-svc-worker',
+      name: 'Nightly cleanup',
+      schedule: '0 2 * * *',
+      command: 'npm run cleanup:expired',
+      timezone: 'UTC',
+      enabled: true,
+      last_run_at: '2026-03-31T02:00:00Z',
+      next_run_at: '2026-04-01T02:00:00Z',
+      last_status: 'success',
+      retention: 50,
+      created_at: '2026-03-12T10:20:00Z',
+      updated_at: '2026-03-31T02:00:00Z',
+    },
+    {
+      id: 'demo-cron-report',
+      project_id: 'demo-project-core',
+      service_id: 'demo-svc-worker',
+      name: 'Hourly metrics rollup',
+      schedule: '15 * * * *',
+      command: 'npm run metrics:rollup',
+      timezone: 'UTC',
+      enabled: true,
+      last_run_at: '2026-03-31T09:15:00Z',
+      next_run_at: '2026-03-31T10:15:00Z',
+      last_status: 'success',
+      retention: 50,
+      created_at: '2026-03-12T10:21:00Z',
+      updated_at: '2026-03-31T09:15:00Z',
+    },
+  ],
+  'demo-svc-api': [
+    {
+      id: 'demo-cron-warmup',
+      project_id: 'demo-project-core',
+      service_id: 'demo-svc-api',
+      name: 'Cache warmup',
+      schedule: '*/10 * * * *',
+      command: 'curl -sf http://localhost:8080/warm',
+      timezone: 'UTC',
+      enabled: false,
+      last_run_at: '2026-03-30T22:10:00Z',
+      next_run_at: '2026-03-30T22:20:00Z',
+      last_status: 'failed',
+      last_output: 'curl: (7) Failed to connect to localhost port 8080',
+      retention: 50,
+      created_at: '2026-03-12T10:22:00Z',
+      updated_at: '2026-03-30T22:10:00Z',
+    },
+  ],
+};
+
+export function getDemoCronJobsByService(serviceId: string): CronJobEntity[] {
+  return demoCronJobsByService[serviceId] ?? [];
+}