T2.2: Migrate scheduler to use domain.Schedule

Parse each job's schedule once on load (resetNextRuns) and on edit
(RefreshSchedule) via the new parseJobSchedule helper, caching the
result in a map[int]domain.Schedule keyed by job ID. prepareNextRun
now looks up the cached Schedule instead of re-parsing the string on
every call. Remove the nextRunTime wrapper that did the per-call
parsing. Drop the three scheduler_test.go tests that duplicated
coverage already in domain/schedule_test.go.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/REFACTORING.md

@@ -255,7 +255,7 @@ Track progress here. Mark tasks complete as they land and pass review.
 
 ### Phase 2 — Domain cleanup
 - [x] T2.1 — Add `src/domain/schedule.go`; Schedule value object
-- [ ] T2.2 — Migrate `scheduler` to use Schedule
+- [x] T2.2 — Migrate `scheduler` to use Schedule
 - [ ] T2.3 — Split `domain.Job` (durable) from `domain.JobRuntime` (transient)
 - [ ] T2.4 — Update `storage`: load/save Job only; move runtime init
 

src/scheduler/scheduler.go

@@ -25,6 +25,7 @@ type Scheduler struct {
 	ctx       context.Context
 	cancel    context.CancelFunc
 	paused    bool
+	schedules map[int]domain.Schedule // parsed once per job on load/edit
 }
 
 func NewScheduler(store *storage.Store, jobs *[]domain.Job, onChange func(domain.RunRecord)) *Scheduler {
@@ -35,6 +36,7 @@ func NewScheduler(store *storage.Store, jobs *[]domain.Job, onChange func(domain
 		onChange:  onChange,
 		ctx:       ctx,
 		cancel:    cancel,
+		schedules: make(map[int]domain.Schedule),
 	}
 	s.resetNextRuns(time.Now())
 	return s
@@ -107,6 +109,7 @@ func (s *Scheduler) RefreshSchedule(index int) {
 		return
 	}
 	job := &(*s.jobs)[index]
+	s.parseJobSchedule(job) // re-parse in case the schedule string changed
 	if !job.Enabled {
 		job.NextRun = "Paused"
 		return
@@ -207,6 +210,7 @@ func runningOutput(job domain.Job, trigger string, started time.Time) string {
 func (s *Scheduler) resetNextRuns(now time.Time) {
 	for index := range *s.jobs {
 		job := &(*s.jobs)[index]
+		s.parseJobSchedule(job) // parse once on load
 		if !job.Enabled {
 			job.NextRun = "Paused"
 			continue
@@ -216,24 +220,25 @@ func (s *Scheduler) resetNextRuns(now time.Time) {
 	_ = s.store.SaveJobs(*s.jobs)
 }
 
+// parseJobSchedule caches a parsed domain.Schedule for the job. Invalid
+// schedule strings are silently dropped from the cache so prepareNextRun can
+// distinguish them from valid ones.
+func (s *Scheduler) parseJobSchedule(job *domain.Job) {
+	sched, err := domain.Parse(job.Schedule)
+	if err != nil {
+		delete(s.schedules, job.ID)
+		return
+	}
+	s.schedules[job.ID] = sched
+}
+
 func (s *Scheduler) prepareNextRun(job *domain.Job, from time.Time) {
-	next, ok := nextRunTime(job.Schedule, from)
+	sched, ok := s.schedules[job.ID]
 	if !ok {
 		job.NextRun = "Invalid schedule"
 		job.NextDue = time.Time{}
 		return
 	}
-	job.NextDue = next
+	job.NextDue = sched.Next(from)
 	job.NextRun = job.NextDue.Format("2006-01-02 15:04:05")
 }
-
-// nextRunTime is a thin wrapper over domain.Schedule kept for the scheduler's
-// existing call sites. It parses the schedule on every call for now; T2.2
-// replaces this with a Schedule parsed once on load/edit.
-func nextRunTime(schedule string, from time.Time) (time.Time, bool) {
-	parsed, err := domain.Parse(schedule)
-	if err != nil {
-		return time.Time{}, false
-	}
-	return parsed.Next(from), true
-}

src/scheduler/scheduler_test.go

@@ -8,32 +8,10 @@ import (
 	"gitea.mixdep.ru/mix/gosentry/src/domain"
 )
 
-func TestNextRunTimeRejectsInvalidSchedules(t *testing.T) {
-	from := time.Date(2026, 6, 14, 12, 0, 0, 0, time.UTC)
-	cases := []struct {
-		schedule string
-		desc     string
-	}{
-		{"", "empty string"},
-		{"   ", "whitespace only"},
-		{"@every", "bare @every without duration"},
-		{"@every xyz", "invalid @every duration string"},
-		{"@every -1s", "negative @every duration"},
-		{"@every 0s", "zero @every duration"},
-		{"not-a-cron", "invalid cron expression"},
-		{"60 * * * *", "cron minute out of range"},
-	}
-	for _, tc := range cases {
-		_, ok := nextRunTime(tc.schedule, from)
-		if ok {
-			t.Errorf("nextRunTime(%q) [%s]: expected false, got true", tc.schedule, tc.desc)
-		}
-	}
-}
-
 func TestPrepareNextRunSetsDisplayString(t *testing.T) {
 	jobs := []domain.Job{{Schedule: "*/5 * * * *", Enabled: true}}
-	s := &Scheduler{jobs: &jobs}
+	s := &Scheduler{jobs: &jobs, schedules: make(map[int]domain.Schedule)}
+	s.parseJobSchedule(&jobs[0])
 	from := time.Date(2026, 6, 14, 12, 3, 0, 0, time.UTC)
 
 	s.prepareNextRun(&jobs[0], from)
@@ -50,7 +28,9 @@ func TestPrepareNextRunSetsDisplayString(t *testing.T) {
 
 func TestPrepareNextRunSetsInvalidScheduleLabel(t *testing.T) {
 	jobs := []domain.Job{{Schedule: "not-a-cron", Enabled: true}}
-	s := &Scheduler{jobs: &jobs}
+	s := &Scheduler{jobs: &jobs, schedules: make(map[int]domain.Schedule)}
+	// parseJobSchedule will drop the invalid spec, so schedules map stays empty.
+	s.parseJobSchedule(&jobs[0])
 
 	s.prepareNextRun(&jobs[0], time.Now())
 
@@ -62,29 +42,6 @@ func TestPrepareNextRunSetsInvalidScheduleLabel(t *testing.T) {
 	}
 }
 
-func TestNextRunTimeSupportsEvery(t *testing.T) {
-	from := time.Date(2026, 6, 14, 12, 0, 0, 0, time.UTC)
-	next, ok := nextRunTime("@every 10s", from)
-	if !ok {
-		t.Fatal("expected @every schedule to parse")
-	}
-	if want := from.Add(10 * time.Second); !next.Equal(want) {
-		t.Fatalf("expected %s, got %s", want, next)
-	}
-}
-
-func TestNextRunTimeSupportsCron(t *testing.T) {
-	from := time.Date(2026, 6, 14, 12, 3, 0, 0, time.UTC)
-	next, ok := nextRunTime("*/5 * * * *", from)
-	if !ok {
-		t.Fatal("expected cron schedule to parse")
-	}
-	want := time.Date(2026, 6, 14, 12, 5, 0, 0, time.UTC)
-	if !next.Equal(want) {
-		t.Fatalf("expected %s, got %s", want, next)
-	}
-}
-
 func TestRunningOutputIncludesInvocation(t *testing.T) {
 	started := time.Date(2026, 6, 17, 23, 40, 0, 0, time.Local)
 	job := domain.Job{