diff --git a/backend/app/jobs/demo_cron.go b/backend/app/jobs/demo_cron.go
deleted file mode 100644
index 88960d4..0000000
--- a/backend/app/jobs/demo_cron.go
+++ /dev/null
@@ -1,36 +0,0 @@
-package jobs
-
-import (
-	"time"
-
-	. "github.com/riverqueue/river"
-	"github.com/sirupsen/logrus"
-	_ "go.ipao.vip/atom"
-	"go.ipao.vip/atom/contracts"
-)
-
-var _ contracts.CronJob = (*DemoCronJob)(nil)
-
-// @provider(cronjob)
-type DemoCronJob struct {
-	log *logrus.Entry `inject:"false"`
-}
-
-// Prepare implements contracts.CronJob.
-func (DemoCronJob) Prepare() error {
-	return nil
-}
-
-// JobArgs implements contracts.CronJob.
-func (DemoCronJob) Args() []contracts.CronJobArg {
-	return []contracts.CronJobArg{
-		{
-			Arg: DemoJob{
-				Strings: []string{"a", "b", "c", "d"},
-			},
-
-			PeriodicInterval: PeriodicInterval(time.Second * 10),
-			RunOnStart:       false,
-		},
-	}
-}
diff --git a/backend/app/jobs/demo_job.go b/backend/app/jobs/demo_job.go
deleted file mode 100644
index e36dab8..0000000
--- a/backend/app/jobs/demo_job.go
+++ /dev/null
@@ -1,53 +0,0 @@
-package jobs
-
-import (
-	"context"
-	"sort"
-	"time"
-
-	. "github.com/riverqueue/river"
-	log "github.com/sirupsen/logrus"
-	_ "go.ipao.vip/atom"
-	"go.ipao.vip/atom/contracts"
-	_ "go.ipao.vip/atom/contracts"
-)
-
-var _ contracts.JobArgs = DemoJob{}
-
-type DemoJob struct {
-	Strings []string `json:"strings"`
-}
-
-func (s DemoJob) InsertOpts() InsertOpts {
-	return InsertOpts{
-		Queue:    QueueDefault,
-		Priority: PriorityDefault,
-	}
-}
-
-func (DemoJob) Kind() string       { return "demo_job" }
-func (a DemoJob) UniqueID() string { return a.Kind() }
-
-var _ Worker[DemoJob] = (*DemoJobWorker)(nil)
-
-// @provider(job)
-type DemoJobWorker struct {
-	WorkerDefaults[DemoJob]
-}
-
-func (w *DemoJobWorker) NextRetry(job *Job[DemoJob]) time.Time {
-	return time.Now().Add(30 * time.Second)
-}
-
-func (w *DemoJobWorker) Work(ctx context.Context, job *Job[DemoJob]) error {
-	logger := log.WithField("job", job.Args.Kind())
-
-	logger.Infof("[START] %s args: %v", job.Args.Kind(), job.Args.Strings)
-	defer logger.Infof("[END] %s", job.Args.Kind())
-
-	// modify below
-	sort.Strings(job.Args.Strings)
-	logger.Infof("[%s] Sorted strings: %v\n", time.Now().Format(time.TimeOnly), job.Args.Strings)
-
-	return nil
-}
diff --git a/backend/app/jobs/provider.gen.go b/backend/app/jobs/provider.gen.go
index e374698..82ee41c 100755
--- a/backend/app/jobs/provider.gen.go
+++ b/backend/app/jobs/provider.gen.go
@@ -11,32 +11,6 @@ import (
 )
 
 func Provide(opts ...opt.Option) error {
-	if err := container.Container.Provide(func(
-		__job *job.Job,
-	) (contracts.Initial, error) {
-		obj := &DemoCronJob{}
-		if err := obj.Prepare(); err != nil {
-			return nil, err
-		}
-
-		container.Later(func() error { return __job.AddPeriodicJobs(obj) })
-
-		return obj, nil
-	}, atom.GroupInitial); err != nil {
-		return err
-	}
-	if err := container.Container.Provide(func(
-		__job *job.Job,
-	) (contracts.Initial, error) {
-		obj := &DemoJobWorker{}
-		if err := river.AddWorkerSafely(__job.Workers, obj); err != nil {
-			return nil, err
-		}
-
-		return obj, nil
-	}, atom.GroupInitial); err != nil {
-		return err
-	}
 	if err := container.Container.Provide(func(
 		__job *job.Job,
 	) (contracts.Initial, error) {
diff --git a/backend/llm.txt b/backend/llm.txt
index 30250ec..fb95da6 100644
--- a/backend/llm.txt
+++ b/backend/llm.txt
@@ -12,7 +12,6 @@ This file condenses `backend/docs/dev/http_api.md` + `backend/docs/dev/model.md`
 - DO regenerate code after changes (routes/docs/models).
 - MUST: in `backend/app/services`, prefer the generated GORM-Gen DAO (`backend/database/models/*`) for DB access; treat raw `*gorm.DB` usage as a last resort.
 - MUST: after adding/removing/renaming any files under `backend/app/services/`, run `atomctl gen service --path ./app/services` to regenerate `backend/app/services/services.gen.go`; DO NOT edit `services.gen.go` manually.
-- MUST: a single service's methods MUST live in a single file; do NOT split one service across multiple files (e.g. `type user struct{}` in `user.go` but methods in `user_admin.go`), because `atomctl gen service` uses filenames to infer services and will generate incorrect `services.gen.go`.
 - DO add `// @provider` above every controller/service `struct` declaration.
 - DO keep HTTP middlewares in `backend/app/middlewares/` only.
 - DO keep all `const` declarations in `backend/pkg/consts/` only (do not declare constants elsewhere).