diff --git a/docs/REFACTORING.md b/docs/REFACTORING.md
index 243d1da..fa77079 100644
--- a/docs/REFACTORING.md
+++ b/docs/REFACTORING.md
@@ -192,7 +192,7 @@ Mechanical moves + import fixes only. Behavior identical.
 | T2.1 | Add `src/domain/schedule.go`: `Schedule` value object with `Parse`, `Validate`, `Next(time.Time)`. Unit-test it. Keep `nextRunTime` as a thin wrapper initially. | opus | high |
 | T2.2 | Migrate `scheduler` to use `Schedule` (parse on load/edit, not per tick). Remove duplicated parsing. | sonnet | medium |
 | T2.3 | Split `domain.Job` (durable) from `domain.JobRuntime` (transient). Remove all `yaml:"-"` fields and `nextDue` from `Job`. Add `runtime.go`. | opus | high |
-| T2.4 | Update `storage`: load/save only `Job`; move runtime initialization out of `normalizeJobs` into a `domain.NewRuntime(job)` constructor. Update round-trip tests. | sonnet | medium |
+| T2.4 | Update `storage`: load/save only `Job`; move runtime initialization out of `normalizeJobs` into a `domain.NewRuntime(job)` constructor. Update round-trip tests. **(Completed as part of T2.3 — removing the runtime fields from `Job` forced all three deliverables. Runtime-map ownership is deferred to T3.1.)** | sonnet | medium |
 
 > After Phase 2 the scheduler and GUI still share state; the `Job`/`JobRuntime`
 > split is wired through temporary glue. Phase 3 removes the sharing.
@@ -256,8 +256,8 @@ 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
 - [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
+- [x] T2.3 — Split `domain.Job` (durable) from `domain.JobRuntime` (transient)
+- [x] T2.4 — Update `storage`: load/save Job only; move runtime init _(landed with T2.3)_
 
 ### Phase 3 — Application service layer
 - [ ] T3.1 — Create `src/app/service.go`; owns state behind mutex
diff --git a/src/domain/job.go b/src/domain/job.go
index b8294d8..0731713 100644
--- a/src/domain/job.go
+++ b/src/domain/job.go
@@ -1,30 +1,18 @@
 package domain
 
-import "time"
-
-// Job is the user-visible scheduled command.
-//
-// Fields with yaml:"-" are deliberately runtime-only. They are useful in the GUI
-// while GoSentry is running, but writing them to jobs.yaml would make the jobs
-// file noisy and would mix durable configuration with transient execution state.
+// Job is the user-visible scheduled command. It contains only durable
+// configuration: every field is persisted to jobs.yaml. Transient execution
+// state (last run, next run, command output, in-memory activity) lives in a
+// separate JobRuntime so the jobs file stays a clean, hand-editable record of
+// configuration and never mixes in process-lifetime bookkeeping.
 type Job struct {
-	ID               int         `yaml:"id"`
-	Name             string      `yaml:"name"`
-	Folder           string      `yaml:"folder,omitempty"`
-	Schedule         string      `yaml:"schedule"`
-	Command          string      `yaml:"command"`
-	Arguments        string      `yaml:"arguments,omitempty"`
-	SuccessExitCodes string      `yaml:"success_exit_codes,omitempty"`
-	StartOnly        bool        `yaml:"start_only,omitempty"`
-	Enabled          bool        `yaml:"enabled"`
-	LastRun          string      `yaml:"-"`
-	NextRun          string      `yaml:"-"`
-	LastState        string      `yaml:"-"`
-	Logs             []RunRecord `yaml:"-"`
-	Output           string      `yaml:"-"`
-
-	// NextDue is kept as time.Time for scheduler comparisons. The formatted
-	// NextRun string above exists only for display in the GUI and YAML rewriting
-	// must not persist it.
-	NextDue time.Time `yaml:"-"`
+	ID               int    `yaml:"id"`
+	Name             string `yaml:"name"`
+	Folder           string `yaml:"folder,omitempty"`
+	Schedule         string `yaml:"schedule"`
+	Command          string `yaml:"command"`
+	Arguments        string `yaml:"arguments,omitempty"`
+	SuccessExitCodes string `yaml:"success_exit_codes,omitempty"`
+	StartOnly        bool   `yaml:"start_only,omitempty"`
+	Enabled          bool   `yaml:"enabled"`
 }
diff --git a/src/domain/runtime.go b/src/domain/runtime.go
new file mode 100644
index 0000000..35934be
--- /dev/null
+++ b/src/domain/runtime.go
@@ -0,0 +1,49 @@
+package domain
+
+import "time"
+
+// JobRuntime is the transient execution state for a Job. It is never written to
+// jobs.yaml: it is rebuilt from scratch each time GoSentry starts and is held in
+// memory keyed by Job.ID for the lifetime of the process. Keeping it separate
+// from Job is what lets the durable configuration file stay free of run records,
+// status strings, and scheduling bookkeeping.
+type JobRuntime struct {
+	LastRun   string
+	NextRun   string
+	LastState string
+	Output    string
+	Logs      []RunRecord
+
+	// NextDue is the next scheduled execution time, kept as time.Time for
+	// scheduler comparisons. NextRun above is its formatted display string and is
+	// the only form shown in the GUI.
+	NextDue time.Time
+}
+
+// NewRuntime builds the initial runtime state for a freshly loaded or created
+// job. Enabled jobs start "Ready" and wait for the scheduler to compute their
+// first run; disabled jobs start "Paused".
+func NewRuntime(job Job) *JobRuntime {
+	runtime := &JobRuntime{
+		LastRun: "Never",
+		Output:  "No command output captured yet.",
+	}
+	if job.Enabled {
+		runtime.LastState = "Ready"
+		runtime.NextRun = "After start"
+	} else {
+		runtime.LastState = "Paused"
+		runtime.NextRun = "Paused"
+	}
+	return runtime
+}
+
+// NewRuntimes builds a runtime map for a slice of jobs, keyed by Job.ID. It is
+// the convenience entry point used when a whole jobs file has just been loaded.
+func NewRuntimes(jobs []Job) map[int]*JobRuntime {
+	runtimes := make(map[int]*JobRuntime, len(jobs))
+	for _, job := range jobs {
+		runtimes[job.ID] = NewRuntime(job)
+	}
+	return runtimes
+}
diff --git a/src/gui/app.go b/src/gui/app.go
index 373c2a4..53caf71 100644
--- a/src/gui/app.go
+++ b/src/gui/app.go
@@ -172,7 +172,21 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 	if iconPath, err := desktop.InstallDesktopIntegration(appID, store.Paths.ExecutablePath, assets.IconBytes()); err == nil {
 		store.Paths.DesktopIcon = iconPath
 	}
-	events := collectActivity(jobs)
+
+	// Transient execution state lives in a runtime map keyed by job ID, separate
+	// from the durable jobs slice. The scheduler shares the same map so background
+	// runs and GUI edits observe one in-memory copy of each job's status.
+	runtimes := domain.NewRuntimes(jobs)
+	runtimeFor := func(index int) *domain.JobRuntime {
+		if index < 0 || index >= len(jobs) {
+			return &domain.JobRuntime{}
+		}
+		if runtime := runtimes[jobs[index].ID]; runtime != nil {
+			return runtime
+		}
+		return &domain.JobRuntime{}
+	}
+	events := collectActivity(jobs, runtimes)
 
 	// The GUI keeps the loaded jobs slice in memory and persists changes after
 	// each edit/run. This keeps the first version responsive and easy to reason
@@ -190,12 +204,13 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 	arguments := newJobDetailLabel(jobs[selected].Arguments)
 	successExitCodes := newJobDetailLabel(displaySuccessExitCodes(jobs[selected].SuccessExitCodes))
 	runMode := newJobDetailLabel(displayRunMode(jobs[selected]))
-	lastRun := newJobDetailLabel(jobs[selected].LastRun)
-	nextRun := newJobDetailLabel(jobs[selected].NextRun)
-	state := newJobDetailLabel(jobs[selected].LastState)
+	selectedRuntime := runtimeFor(selected)
+	lastRun := newJobDetailLabel(selectedRuntime.LastRun)
+	nextRun := newJobDetailLabel(selectedRuntime.NextRun)
+	state := newJobDetailLabel(selectedRuntime.LastState)
 	schedulerState := widget.NewLabel("Scheduler running")
 	commandOutput := widget.NewTextGrid()
-	commandOutput.SetText(jobs[selected].Output)
+	commandOutput.SetText(selectedRuntime.Output)
 	commandOutputScroll := container.NewScroll(commandOutput)
 	// Command output can contain long lines and preserved whitespace. TextGrid is
 	// used instead of Label so stdout/stderr remains readable and does not vanish
@@ -214,7 +229,7 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		events = append(events, newEvent(0, "Application", "Started", detail))
 		history.Refresh()
 	}
-	selectedLogs := append([]event(nil), jobs[selected].Logs...)
+	selectedLogs := append([]event(nil), selectedRuntime.Logs...)
 	jobLogs := widget.NewList(
 		func() int {
 			return len(selectedLogs)
@@ -245,6 +260,7 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		}
 		selected = index
 		current := jobs[selected]
+		runtime := runtimeFor(selected)
 		title.SetText(current.Name)
 		folder.SetText(displayFolder(current.Folder))
 		schedule.SetText(current.Schedule)
@@ -252,11 +268,11 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		arguments.SetText(displayArguments(current.Arguments))
 		successExitCodes.SetText(displaySuccessExitCodes(current.SuccessExitCodes))
 		runMode.SetText(displayRunMode(current))
-		lastRun.SetText(current.LastRun)
-		nextRun.SetText(current.NextRun)
-		state.SetText(current.LastState)
-		commandOutput.SetText(current.Output)
-		selectedLogs = append(selectedLogs[:0], current.Logs...)
+		lastRun.SetText(runtime.LastRun)
+		nextRun.SetText(runtime.NextRun)
+		state.SetText(runtime.LastState)
+		commandOutput.SetText(runtime.Output)
+		selectedLogs = append(selectedLogs[:0], runtime.Logs...)
 	}
 	refresh := func() {
 		// Several callbacks mutate jobs, filters, and event history. A single
@@ -288,7 +304,7 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 			// Keep each row compact: folder, schedule, and command are shown in one
 			// metadata line so the left pane stays useful even with many jobs.
 			meta.SetText(displayFolder(current.Folder) + "    " + current.Schedule + "    " + displayInvocation(current))
-			status.SetText(statusText(current))
+			status.SetText(statusText(current, runtimes[current.ID]))
 		},
 	)
 	list.OnSelected = func(id widget.ListItemID) {
@@ -321,15 +337,17 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 	folderSelect.SetSelected(selectedFolder)
 
 	addButton := widget.NewButtonWithIcon("New job", theme.ContentAddIcon(), func() {
-		showJobDialog(w, "New job", job{Schedule: "@every 1m", Command: "echo GoSentry job ran", Enabled: true, LastRun: "Never", NextRun: "After save", LastState: "Ready"}, func(saved job) {
+		showJobDialog(w, "New job", job{Schedule: "@every 1m", Command: "echo GoSentry job ran", Enabled: true}, func(saved job) {
 			saved.ID = nextJobID
 			nextJobID++
 			jobs = append(jobs, saved)
+			runtime := domain.NewRuntime(saved)
+			runtimes[saved.ID] = runtime
 			selected = len(jobs) - 1
 			created := newEvent(saved.ID, saved.Name, "Created", "Job was added")
 			// UI events are kept in memory for the current session. They explain
 			// user actions in History, while command output remains in log files.
-			jobs[selected].Logs = append([]event{created}, jobs[selected].Logs...)
+			runtime.Logs = append([]event{created}, runtime.Logs...)
 			events = append(events, created)
 			_ = store.SaveJobs(jobs)
 			folderSelect.Options = folderOptions(jobs)
@@ -351,11 +369,25 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		}
 		showJobDialog(w, "Edit job", jobs[selected], func(saved job) {
 			saved.ID = jobs[selected].ID
-			saved.Logs = jobs[selected].Logs
-			saved.Output = jobs[selected].Output
 			jobs[selected] = saved
+			// Runtime state (activity, output, status) is keyed by job ID and the ID
+			// is unchanged, so it survives the edit automatically. Reflect a possible
+			// enabled/disabled change into the status; the scheduler recomputes the
+			// next-run string below.
+			runtime := runtimes[saved.ID]
+			if runtime != nil {
+				if saved.Enabled {
+					if runtime.LastState == "" || runtime.LastState == "Paused" {
+						runtime.LastState = "Ready"
+					}
+				} else {
+					runtime.LastState = "Paused"
+				}
+			}
 			updated := newEvent(saved.ID, saved.Name, "Updated", "Job settings changed")
-			jobs[selected].Logs = append([]event{updated}, jobs[selected].Logs...)
+			if runtime != nil {
+				runtime.Logs = append([]event{updated}, runtime.Logs...)
+			}
 			events = append(events, updated)
 			if sched != nil {
 				sched.RefreshSchedule(selected)
@@ -391,8 +423,8 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 			stopAllButton.SetText("Resume all")
 			stopAllButton.SetIcon(theme.MediaPlayIcon())
 			for index := range jobs {
-				if jobs[index].Enabled {
-					jobs[index].NextRun = "Scheduler paused"
+				if runtime := runtimes[jobs[index].ID]; runtime != nil && jobs[index].Enabled {
+					runtime.NextRun = "Scheduler paused"
 				}
 			}
 			if sched != nil {
@@ -404,10 +436,11 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 			stopAllButton.SetText("Pause all")
 			stopAllButton.SetIcon(theme.MediaStopIcon())
 			for index := range jobs {
-				if jobs[index].Enabled && jobs[index].NextRun == "Scheduler paused" {
+				runtime := runtimes[jobs[index].ID]
+				if runtime != nil && jobs[index].Enabled && runtime.NextRun == "Scheduler paused" {
 					// The scheduler will calculate the exact next run when it is
 					// resumed; this interim text prevents a stale paused timestamp.
-					jobs[index].NextRun = "Waiting for scheduler"
+					runtime.NextRun = "Waiting for scheduler"
 				}
 			}
 			if sched != nil {
@@ -424,20 +457,21 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		}
 		current := &jobs[selected]
 		current.Enabled = !current.Enabled
+		runtime := runtimeFor(selected)
 		if current.Enabled {
-			current.LastState = "Ready"
-			current.NextRun = "Waiting for scheduler"
+			runtime.LastState = "Ready"
+			runtime.NextRun = "Waiting for scheduler"
 			resumed := newEvent(current.ID, current.Name, "Resumed", "Job was enabled")
-			current.Logs = append([]event{resumed}, current.Logs...)
+			runtime.Logs = append([]event{resumed}, runtime.Logs...)
 			events = append(events, resumed)
 			if sched != nil {
 				sched.RefreshSchedule(selected)
 			}
 		} else {
-			current.LastState = "Paused"
-			current.NextRun = "Paused"
+			runtime.LastState = "Paused"
+			runtime.NextRun = "Paused"
 			paused := newEvent(current.ID, current.Name, "Paused", "Job was disabled")
-			current.Logs = append([]event{paused}, current.Logs...)
+			runtime.Logs = append([]event{paused}, runtime.Logs...)
 			events = append(events, paused)
 			if sched != nil {
 				sched.RefreshSchedule(selected)
@@ -459,6 +493,7 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 				return
 			}
 			jobs = append(jobs[:selected], jobs[selected+1:]...)
+			delete(runtimes, deleted.ID)
 			folderSelect.Options = folderOptions(jobs)
 			folderSelect.Refresh()
 			filteredJobs = filteredJobIndexes(jobs, selectedFolder)
@@ -507,7 +542,7 @@ func newMainView(w fyne.Window) (fyne.CanvasObject, func(time.Duration, bool)) {
 		jobLogs,
 	)
 
-	sched = scheduler.NewScheduler(store, &jobs, func(record domain.RunRecord) {
+	sched = scheduler.NewScheduler(store, &jobs, runtimes, func(record domain.RunRecord) {
 		// Scheduled runs happen on the scheduler goroutine. The callback updates
 		// the shared in-memory event list so History reflects background activity.
 		events = append(events, record)
@@ -559,11 +594,14 @@ func (layout minWidthLayout) Layout(objects []fyne.CanvasObject, size fyne.Size)
 	}
 }
 
-func statusText(j job) string {
+func statusText(j job, runtime *domain.JobRuntime) string {
 	if !j.Enabled {
 		return "Paused"
 	}
-	return j.LastState
+	if runtime == nil {
+		return ""
+	}
+	return runtime.LastState
 }
 
 func newEvent(jobID int, jobName string, state string, detail string) event {
@@ -590,13 +628,15 @@ func eventText(e event) string {
 	return fmt.Sprintf("%s  %s  %s  %s  %s", e.Time, trigger, e.JobName, e.State, e.Detail)
 }
 
-func collectActivity(jobs []job) []event {
+func collectActivity(jobs []job, runtimes map[int]*domain.JobRuntime) []event {
 	var events []event
 	for _, current := range jobs {
 		// At startup this is usually empty because jobs.yaml does not persist
 		// runtime logs. The function still centralizes the merge for future
 		// history loading from log metadata.
-		events = append(events, current.Logs...)
+		if runtime := runtimes[current.ID]; runtime != nil {
+			events = append(events, runtime.Logs...)
+		}
 	}
 	sort.SliceStable(events, func(left int, right int) bool {
 		return events[left].Time < events[right].Time
@@ -778,18 +818,9 @@ func showJobDialog(w fyne.Window, title string, current job, onSave func(job)) {
 			}
 			current.StartOnly = startOnly.Checked
 			current.Enabled = enabled.Checked
-			if current.LastRun == "" {
-				current.LastRun = "Never"
-			}
-			if current.Enabled {
-				current.NextRun = "Waiting for scheduler"
-				if current.LastState == "" || current.LastState == "Paused" {
-					current.LastState = "Ready"
-				}
-			} else {
-				current.NextRun = "Paused"
-				current.LastState = "Paused"
-			}
+			// The dialog only edits durable configuration now. Runtime status is
+			// initialized (new jobs) or updated (edits) by the caller against the
+			// runtime map, keyed by job ID.
 			onSave(current)
 		},
 		w,
diff --git a/src/runner/runner.go b/src/runner/runner.go
index e49433a..873d607 100644
--- a/src/runner/runner.go
+++ b/src/runner/runner.go
@@ -49,13 +49,14 @@ func RunJob(ctx context.Context, job *domain.Job, trigger string, logsDir string
 	}
 
 	now := time.Now()
-	job.LastRun = now.Format("2006-01-02 15:04:05")
-	job.LastState = state
-	job.Output = output
+	timestamp := now.Format("2006-01-02 15:04:05")
 	logFile := writeRunLog(logsDir, *job, trigger, state, detail, output, now)
 
-	record := domain.RunRecord{
-		Time:    job.LastRun,
+	// The runner is now pure with respect to the job: it returns a RunRecord and
+	// lets the caller fold that record into the job's JobRuntime. Run state no
+	// longer lives on Job, so there is nothing on the job to mutate here.
+	return domain.RunRecord{
+		Time:    timestamp,
 		JobID:   job.ID,
 		JobName: job.Name,
 		Trigger: trigger,
@@ -64,14 +65,6 @@ func RunJob(ctx context.Context, job *domain.Job, trigger string, logsDir string
 		LogFile: logFile,
 		Output:  output,
 	}
-	// Keep a small in-memory history for the currently running GUI. Full command
-	// output is persisted to files, so retaining every past record in RAM would
-	// only duplicate data and make long sessions grow without bound.
-	job.Logs = append([]domain.RunRecord{record}, job.Logs...)
-	if len(job.Logs) > 50 {
-		job.Logs = job.Logs[:50]
-	}
-	return record
 }
 
 func startJobOnly(invocation commandInvocation, job domain.Job, started time.Time) (string, string, string) {
diff --git a/src/scheduler/scheduler.go b/src/scheduler/scheduler.go
index f192fc8..ec24ba5 100644
--- a/src/scheduler/scheduler.go
+++ b/src/scheduler/scheduler.go
@@ -8,8 +8,8 @@ import (
 	"time"
 
 	"gitea.mixdep.ru/mix/gosentry/src/domain"
-	"gitea.mixdep.ru/mix/gosentry/src/storage"
 	"gitea.mixdep.ru/mix/gosentry/src/runner"
+	"gitea.mixdep.ru/mix/gosentry/src/storage"
 )
 
 // Scheduler owns the timing loop for jobs that are currently loaded in the GUI.
@@ -19,6 +19,7 @@ import (
 type Scheduler struct {
 	store    *storage.Store
 	jobs     *[]domain.Job
+	runtimes map[int]*domain.JobRuntime
 	onChange func(domain.RunRecord)
 
 	mu        sync.Mutex
@@ -28,11 +29,15 @@ type Scheduler struct {
 	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 {
+// NewScheduler shares the durable jobs slice and the transient runtime map with
+// the GUI. Both still point at the same in-memory state for now; Phase 3 moves
+// ownership behind an application service.
+func NewScheduler(store *storage.Store, jobs *[]domain.Job, runtimes map[int]*domain.JobRuntime, onChange func(domain.RunRecord)) *Scheduler {
 	ctx, cancel := context.WithCancel(context.Background())
 	s := &Scheduler{
 		store:     store,
 		jobs:      jobs,
+		runtimes:  runtimes,
 		onChange:  onChange,
 		ctx:       ctx,
 		cancel:    cancel,
@@ -42,6 +47,18 @@ func NewScheduler(store *storage.Store, jobs *[]domain.Job, onChange func(domain
 	return s
 }
 
+// runtimeFor returns the runtime state for a job, lazily creating it if the map
+// has no entry yet. This keeps the scheduler robust if a job is added to the
+// shared slice without a matching runtime.
+func (s *Scheduler) runtimeFor(job *domain.Job) *domain.JobRuntime {
+	runtime, ok := s.runtimes[job.ID]
+	if !ok || runtime == nil {
+		runtime = domain.NewRuntime(*job)
+		s.runtimes[job.ID] = runtime
+	}
+	return runtime
+}
+
 func (s *Scheduler) Start() {
 	// A one-second ticker is accurate enough for cron-style desktop automation
 	// and avoids the complexity of maintaining one timer per job. Five-field cron
@@ -75,15 +92,16 @@ func (s *Scheduler) SetPaused(paused bool) {
 	// understandable even before the next scheduler tick.
 	for index := range *s.jobs {
 		job := &(*s.jobs)[index]
+		runtime := s.runtimeFor(job)
 		if !job.Enabled {
-			job.NextRun = "Paused"
+			runtime.NextRun = "Paused"
 			continue
 		}
 		if paused {
-			job.NextRun = "Scheduler paused"
+			runtime.NextRun = "Scheduler paused"
 			continue
 		}
-		s.prepareNextRun(job, now)
+		s.prepareNextRun(job, runtime, now)
 	}
 	_ = s.store.SaveJobs(*s.jobs)
 }
@@ -109,16 +127,17 @@ func (s *Scheduler) RefreshSchedule(index int) {
 		return
 	}
 	job := &(*s.jobs)[index]
+	runtime := s.runtimeFor(job)
 	s.parseJobSchedule(job) // re-parse in case the schedule string changed
 	if !job.Enabled {
-		job.NextRun = "Paused"
+		runtime.NextRun = "Paused"
 		return
 	}
 	if s.paused {
-		job.NextRun = "Scheduler paused"
+		runtime.NextRun = "Scheduler paused"
 		return
 	}
-	s.prepareNextRun(job, time.Now())
+	s.prepareNextRun(job, runtime, time.Now())
 }
 
 func (s *Scheduler) tick(now time.Time) {
@@ -128,7 +147,8 @@ func (s *Scheduler) tick(now time.Time) {
 	if !s.paused {
 		for index := range *s.jobs {
 			job := &(*s.jobs)[index]
-			if !job.Enabled || job.NextDue.IsZero() || now.Before(job.NextDue) {
+			runtime := s.runtimeFor(job)
+			if !job.Enabled || runtime.NextDue.IsZero() || now.Before(runtime.NextDue) {
 				continue
 			}
 			// Run only one due job per tick for now. That avoids overlapping shell
@@ -145,15 +165,16 @@ func (s *Scheduler) tick(now time.Time) {
 
 func (s *Scheduler) startRunLocked(index int, trigger string) bool {
 	job := &(*s.jobs)[index]
-	if job.LastState == "Running" {
+	runtime := s.runtimeFor(job)
+	if runtime.LastState == "Running" {
 		return false
 	}
 
 	jobCopy := *job
-	job.LastState = "Running"
-	job.NextRun = "Running"
-	job.Output = runningOutput(jobCopy, trigger, time.Now())
-	job.NextDue = time.Time{}
+	runtime.LastState = "Running"
+	runtime.NextRun = "Running"
+	runtime.Output = runningOutput(jobCopy, trigger, time.Now())
+	runtime.NextDue = time.Time{}
 	_ = s.store.SaveJobs(*s.jobs)
 
 	go func() {
@@ -161,14 +182,15 @@ func (s *Scheduler) startRunLocked(index int, trigger string) bool {
 
 		s.mu.Lock()
 		if current := s.findJobByIDLocked(jobCopy.ID); current != nil {
-			current.LastRun = record.Time
-			current.LastState = record.State
-			current.Output = record.Output
-			current.Logs = append([]domain.RunRecord{record}, current.Logs...)
-			if len(current.Logs) > 50 {
-				current.Logs = current.Logs[:50]
+			currentRuntime := s.runtimeFor(current)
+			currentRuntime.LastRun = record.Time
+			currentRuntime.LastState = record.State
+			currentRuntime.Output = record.Output
+			currentRuntime.Logs = append([]domain.RunRecord{record}, currentRuntime.Logs...)
+			if len(currentRuntime.Logs) > 50 {
+				currentRuntime.Logs = currentRuntime.Logs[:50]
 			}
-			s.prepareNextRun(current, time.Now())
+			s.prepareNextRun(current, currentRuntime, time.Now())
 			_ = runner.CleanupLogs(s.store.Paths.LogsDir, s.store.Config.MaxLogFiles, s.store.Config.MaxLogAgeDays)
 			_ = s.store.SaveJobs(*s.jobs)
 		}
@@ -210,12 +232,13 @@ 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]
+		runtime := s.runtimeFor(job)
 		s.parseJobSchedule(job) // parse once on load
 		if !job.Enabled {
-			job.NextRun = "Paused"
+			runtime.NextRun = "Paused"
 			continue
 		}
-		s.prepareNextRun(job, now)
+		s.prepareNextRun(job, runtime, now)
 	}
 	_ = s.store.SaveJobs(*s.jobs)
 }
@@ -232,13 +255,13 @@ func (s *Scheduler) parseJobSchedule(job *domain.Job) {
 	s.schedules[job.ID] = sched
 }
 
-func (s *Scheduler) prepareNextRun(job *domain.Job, from time.Time) {
+func (s *Scheduler) prepareNextRun(job *domain.Job, runtime *domain.JobRuntime, from time.Time) {
 	sched, ok := s.schedules[job.ID]
 	if !ok {
-		job.NextRun = "Invalid schedule"
-		job.NextDue = time.Time{}
+		runtime.NextRun = "Invalid schedule"
+		runtime.NextDue = time.Time{}
 		return
 	}
-	job.NextDue = sched.Next(from)
-	job.NextRun = job.NextDue.Format("2006-01-02 15:04:05")
+	runtime.NextDue = sched.Next(from)
+	runtime.NextRun = runtime.NextDue.Format("2006-01-02 15:04:05")
 }
diff --git a/src/scheduler/scheduler_test.go b/src/scheduler/scheduler_test.go
index 6daec2d..dea7ab3 100644
--- a/src/scheduler/scheduler_test.go
+++ b/src/scheduler/scheduler_test.go
@@ -10,35 +10,37 @@ import (
 
 func TestPrepareNextRunSetsDisplayString(t *testing.T) {
 	jobs := []domain.Job{{Schedule: "*/5 * * * *", Enabled: true}}
-	s := &Scheduler{jobs: &jobs, schedules: make(map[int]domain.Schedule)}
+	s := &Scheduler{jobs: &jobs, runtimes: domain.NewRuntimes(jobs), schedules: make(map[int]domain.Schedule)}
 	s.parseJobSchedule(&jobs[0])
+	runtime := s.runtimeFor(&jobs[0])
 	from := time.Date(2026, 6, 14, 12, 3, 0, 0, time.UTC)
 
-	s.prepareNextRun(&jobs[0], from)
+	s.prepareNextRun(&jobs[0], runtime, from)
 
 	want := "2026-06-14 12:05:00"
-	if jobs[0].NextRun != want {
-		t.Errorf("NextRun: got %q, want %q", jobs[0].NextRun, want)
+	if runtime.NextRun != want {
+		t.Errorf("NextRun: got %q, want %q", runtime.NextRun, want)
 	}
 	wantDue := time.Date(2026, 6, 14, 12, 5, 0, 0, time.UTC)
-	if !jobs[0].NextDue.Equal(wantDue) {
-		t.Errorf("NextDue: got %v, want %v", jobs[0].NextDue, wantDue)
+	if !runtime.NextDue.Equal(wantDue) {
+		t.Errorf("NextDue: got %v, want %v", runtime.NextDue, wantDue)
 	}
 }
 
 func TestPrepareNextRunSetsInvalidScheduleLabel(t *testing.T) {
 	jobs := []domain.Job{{Schedule: "not-a-cron", Enabled: true}}
-	s := &Scheduler{jobs: &jobs, schedules: make(map[int]domain.Schedule)}
+	s := &Scheduler{jobs: &jobs, runtimes: domain.NewRuntimes(jobs), schedules: make(map[int]domain.Schedule)}
 	// parseJobSchedule will drop the invalid spec, so schedules map stays empty.
 	s.parseJobSchedule(&jobs[0])
+	runtime := s.runtimeFor(&jobs[0])
 
-	s.prepareNextRun(&jobs[0], time.Now())
+	s.prepareNextRun(&jobs[0], runtime, time.Now())
 
-	if jobs[0].NextRun != "Invalid schedule" {
-		t.Errorf("NextRun: got %q, want 'Invalid schedule'", jobs[0].NextRun)
+	if runtime.NextRun != "Invalid schedule" {
+		t.Errorf("NextRun: got %q, want 'Invalid schedule'", runtime.NextRun)
 	}
-	if !jobs[0].NextDue.IsZero() {
-		t.Errorf("NextDue should be zero for invalid schedule, got %v", jobs[0].NextDue)
+	if !runtime.NextDue.IsZero() {
+		t.Errorf("NextDue should be zero for invalid schedule, got %v", runtime.NextDue)
 	}
 }
 
diff --git a/src/storage/store.go b/src/storage/store.go
index c5cfecc..e9fa495 100644
--- a/src/storage/store.go
+++ b/src/storage/store.go
@@ -169,23 +169,9 @@ func normalizeJobs(jobs []domain.Job) {
 		if job.SuccessExitCodes == "" {
 			job.SuccessExitCodes = "0"
 		}
-		if job.LastRun == "" {
-			job.LastRun = "Never"
-		}
-		if job.Output == "" {
-			job.Output = "No command output captured yet."
-		}
-		if job.Enabled {
-			job.LastState = "Ready"
-			job.NextRun = "After start"
-		} else {
-			job.LastState = "Paused"
-			job.NextRun = "Paused"
-		}
-		// Runtime fields are reconstructed each time the app starts. Persisted run
-		// records live in log files, not in jobs.yaml, to keep the jobs file easy
-		// to review and edit by hand.
-		job.Logs = nil
+		// Runtime state (last run, next run, status, output, activity) is no longer
+		// part of Job. It is reconstructed each time the app starts via
+		// domain.NewRuntime, so normalizeJobs only touches durable configuration.
 	}
 }
 
diff --git a/src/storage/store_test.go b/src/storage/store_test.go
index 4dd5c4e..bcaa2d9 100644
--- a/src/storage/store_test.go
+++ b/src/storage/store_test.go
@@ -68,16 +68,8 @@ func TestJobsRoundTrip(t *testing.T) {
 		t.Errorf("Enabled: got %v, want %v", g.Enabled, w.Enabled)
 	}
 
-	// Runtime fields must not survive the save→load round-trip.
-	if g.LastRun != "" {
-		t.Errorf("LastRun should be empty after load, got %q", g.LastRun)
-	}
-	if g.LastState != "" {
-		t.Errorf("LastState should be empty after load, got %q", g.LastState)
-	}
-	if g.Logs != nil {
-		t.Errorf("Logs should be nil after load, got %v", g.Logs)
-	}
+	// Runtime state no longer lives on Job at all (it moved to domain.JobRuntime),
+	// so there is nothing transient that could survive the save→load round-trip.
 }
 
 func TestConfigRoundTrip(t *testing.T) {
@@ -137,7 +129,9 @@ func TestNormalizeJobsFillsDefaults(t *testing.T) {
 
 	normalizeJobs(jobs)
 
-	// Blank enabled job gets default name, schedule, command, exit codes, and runtime state.
+	// Blank enabled job gets default name, schedule, command, and exit codes.
+	// normalizeJobs only fills durable configuration now; runtime status is built
+	// separately by domain.NewRuntime.
 	if jobs[0].ID != 1 {
 		t.Errorf("first auto ID: got %d, want 1", jobs[0].ID)
 	}
@@ -150,20 +144,6 @@ func TestNormalizeJobsFillsDefaults(t *testing.T) {
 	if jobs[0].SuccessExitCodes != "0" {
 		t.Errorf("default exit codes: got %q, want '0'", jobs[0].SuccessExitCodes)
 	}
-	if jobs[0].LastState != "Ready" {
-		t.Errorf("enabled job state: got %q, want 'Ready'", jobs[0].LastState)
-	}
-	if jobs[0].NextRun != "After start" {
-		t.Errorf("enabled job next run: got %q, want 'After start'", jobs[0].NextRun)
-	}
-
-	// Disabled job is marked Paused.
-	if jobs[1].LastState != "Paused" {
-		t.Errorf("disabled job state: got %q, want 'Paused'", jobs[1].LastState)
-	}
-	if jobs[1].NextRun != "Paused" {
-		t.Errorf("disabled job next run: got %q, want 'Paused'", jobs[1].NextRun)
-	}
 
 	// Pre-set fields survive normalization unchanged.
 	if jobs[2].ID != 5 {
@@ -175,20 +155,16 @@ func TestNormalizeJobsFillsDefaults(t *testing.T) {
 }
 
 func TestJobsYAMLDoesNotPersistRuntimeNoise(t *testing.T) {
+	// Job carries only durable configuration; runtime state lives in
+	// domain.JobRuntime and is never marshalled. This guards against a future
+	// runtime field accidentally being added back onto Job with a yaml tag.
 	jobs := []domain.Job{
 		{
-			ID:        1,
-			Name:      "Clean job",
-			Schedule:  "@every 10s",
-			Command:   echoCommand("ok"),
-			Enabled:   true,
-			LastRun:   "2026-06-14 12:00:00",
-			NextRun:   "2026-06-14 12:00:10",
-			LastState: "OK",
-			Output:    "stdout: ok",
-			Logs: []domain.RunRecord{
-				{Time: "2026-06-14 12:00:00", JobName: "Clean job", Output: "stdout: ok"},
-			},
+			ID:       1,
+			Name:     "Clean job",
+			Schedule: "@every 10s",
+			Command:  echoCommand("ok"),
+			Enabled:  true,
 		},
 	}