diff --git a/frontend/src/client/events.ts b/frontend/src/client/events.ts
index 265acb2..47fd57e 100644
--- a/frontend/src/client/events.ts
+++ b/frontend/src/client/events.ts
@@ -303,7 +303,12 @@ async function loadSummary() {
   try {
     const params = new URLSearchParams();
     params.set("type", currentType);
-    if (projectFilter && projectFilter !== PERSONAL) {
+    if (projectFilter === PERSONAL) {
+      // "Nur persönliche" → items the caller created. The backend
+      // applies this uniformly to both rails (deadlines + appointments)
+      // and ignores any project_id we'd send. See t-paliad-128.
+      params.set("personal_only", "true");
+    } else if (projectFilter) {
       params.set("project_id", projectFilter);
     }
     const resp = await fetch(`/api/events/summary?${params.toString()}`);
@@ -360,7 +365,12 @@ async function loadList() {
       // no-op on the appointment side.
       params.set("status", statusFilter);
     }
-    if (projectFilter && projectFilter !== PERSONAL) {
+    if (projectFilter === PERSONAL) {
+      // "Nur persönliche" → items the caller created (t-paliad-128).
+      // Applies uniformly to both rails server-side; project_id is
+      // intentionally not sent (the two are mutually exclusive).
+      params.set("personal_only", "true");
+    } else if (projectFilter) {
       params.set("project_id", projectFilter);
     }
     if (currentType !== "appointment") {
@@ -382,13 +392,7 @@ async function loadList() {
       hideTableAndCalendar();
       return;
     }
-    let data: EventListItem[] = await resp.json();
-    // "Personal only" is a UI shorthand for project_id IS NULL on the
-    // appointment side. Filter client-side because the backend doesn't
-    // expose a NULL-id query (matches current /appointments behaviour).
-    if (projectFilter === PERSONAL) {
-      data = data.filter((x) => x.type === "appointment" && !x.project_id);
-    }
+    const data: EventListItem[] = await resp.json();
     allItems = data;
     loadedOK = true;
     render();
@@ -772,19 +776,8 @@ function applyTypeVisibility() {
   // Termin-Typ is appointment-only.
   toggleFilterPair("events-filter-appointment-type", !isDeadline);
 
-  // "Personal only" project option only makes sense with appointments in scope.
-  const projectSel = document.getElementById("events-filter-project") as HTMLSelectElement | null;
-  if (projectSel) {
-    const personalOpt = projectSel.querySelector<HTMLOptionElement>('option[value="__personal__"]');
-    if (personalOpt) {
-      personalOpt.hidden = isDeadline;
-      personalOpt.disabled = isDeadline;
-      if (isDeadline && projectFilter === PERSONAL) {
-        projectFilter = "";
-        projectSel.value = "";
-      }
-    }
-  }
+  // "Nur persönliche" applies uniformly to deadlines + appointments now
+  // (t-paliad-128) — items where the caller is the creator. Always available.
 
   // Update chip active state.
   document.querySelectorAll<HTMLButtonElement>('[data-event-type]').forEach((b) => {
@@ -836,6 +829,7 @@ function syncURLParams() {
   url.searchParams.delete("view");
   url.searchParams.delete("status");
   url.searchParams.delete("project_id");
+  url.searchParams.delete("personal_only");
   url.searchParams.delete("event_type");
   url.searchParams.delete("type_filter");
   // Default type per route comes from window.__PALIAD_EVENTS__; only
@@ -907,6 +901,9 @@ function initFilters() {
     statusFilter = defaultStatusFor(currentType);
   }
   if (params.has("project_id")) projectFilter = params.get("project_id")!;
+  // ?personal_only=true is a bookmark-friendly alias for project_id=__personal__.
+  // Both URLs land on the same UI state (PERSONAL sentinel in the project select).
+  if (params.get("personal_only") === "true") projectFilter = PERSONAL;
   if (params.has("type_filter")) appointmentTypeFilter = params.get("type_filter")!;
 
   const status = document.getElementById("events-filter-status") as HTMLSelectElement;
diff --git a/internal/handlers/events.go b/internal/handlers/events.go
index e659818..996c274 100644
--- a/internal/handlers/events.go
+++ b/internal/handlers/events.go
@@ -8,19 +8,23 @@ import (
 	"mgit.msbls.de/m/paliad/internal/services"
 )
 
-// GET /api/events?type=deadline|appointment|all&status=…&project_id=…&event_type=…&type_filter=…&from=…&to=…
+// GET /api/events?type=deadline|appointment|all&status=…&project_id=…&event_type=…&type_filter=…&from=…&to=…&personal_only=true
 //
-// type        — discriminator for the union; default "all" (Beides on the
-//                front-end). When "deadline" or "appointment", the matching
-//                type-specific filters take effect; the others are ignored.
-// status      — DeadlineStatusFilter (deadline-only).
-// project_id  — single project scope.
-// event_type  — comma-separated event_type uuids; the literal "none"
-//                toggles include-untyped (deadlines only).
-// type_filter — appointment_type filter (hearing/meeting/...). Named
-//                `type_filter` in the query string to avoid clashing with
-//                the `type` discriminator above.
-// from / to   — date window applied to the canonical event_date.
+// type           — discriminator for the union; default "all" (Beides on the
+//                   front-end). When "deadline" or "appointment", the matching
+//                   type-specific filters take effect; the others are ignored.
+// status         — DeadlineStatusFilter (deadline-only on the deadline rail;
+//                   bucket values also narrow the appointment rail).
+// project_id     — single project scope. Ignored when personal_only=true.
+// event_type     — comma-separated event_type uuids; the literal "none"
+//                   toggles include-untyped (deadlines only).
+// type_filter    — appointment_type filter (hearing/meeting/...). Named
+//                   `type_filter` in the query string to avoid clashing with
+//                   the `type` discriminator above.
+// from / to      — date window applied to the canonical event_date.
+// personal_only  — narrow BOTH rails to rows the caller created
+//                   (t-paliad-128). Mutually exclusive with project_id —
+//                   if both are sent, project_id is ignored.
 func handleListEvents(w http.ResponseWriter, r *http.Request) {
 	if !requireDB(w) {
 		return
@@ -32,8 +36,9 @@ func handleListEvents(w http.ResponseWriter, r *http.Request) {
 	q := r.URL.Query()
 
 	filter := services.EventListFilter{
-		Type:   parseEventTypeDiscriminator(q.Get("type")),
-		Status: services.DeadlineStatusFilter(q.Get("status")),
+		Type:         parseEventTypeDiscriminator(q.Get("type")),
+		Status:       services.DeadlineStatusFilter(q.Get("status")),
+		PersonalOnly: parseBoolFlag(q.Get("personal_only")),
 	}
 
 	if raw := q.Get("project_id"); raw != "" {
@@ -81,7 +86,7 @@ func handleListEvents(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, http.StatusOK, rows)
 }
 
-// GET /api/events/summary?type=deadline|appointment|all&project_id=…
+// GET /api/events/summary?type=deadline|appointment|all&project_id=…&personal_only=true
 func handleEventsSummary(w http.ResponseWriter, r *http.Request) {
 	if !requireDB(w) {
 		return
@@ -93,7 +98,8 @@ func handleEventsSummary(w http.ResponseWriter, r *http.Request) {
 	q := r.URL.Query()
 
 	filter := services.EventSummaryFilter{
-		Type: parseEventTypeDiscriminator(q.Get("type")),
+		Type:         parseEventTypeDiscriminator(q.Get("type")),
+		PersonalOnly: parseBoolFlag(q.Get("personal_only")),
 	}
 	if raw := q.Get("project_id"); raw != "" {
 		projectID, err := uuid.Parse(raw)
@@ -125,3 +131,14 @@ func parseEventTypeDiscriminator(raw string) services.EventTypeFilter {
 		return services.EventTypeAll
 	}
 }
+
+// parseBoolFlag accepts the common truthy spellings used in URL flags.
+// Anything else (including the empty string) is false, matching Go's
+// usual permissive treatment of optional bool query params.
+func parseBoolFlag(raw string) bool {
+	switch raw {
+	case "true", "1", "yes", "on":
+		return true
+	}
+	return false
+}
diff --git a/internal/services/appointment_service.go b/internal/services/appointment_service.go
index e40b080..c301370 100644
--- a/internal/services/appointment_service.go
+++ b/internal/services/appointment_service.go
@@ -76,11 +76,18 @@ type UpdateAppointmentInput struct {
 }
 
 // AppointmentListFilter narrows ListVisibleForUser results.
+//
+// CreatedBy narrows to appointments whose `created_by = id`. Backs the
+// "Nur persönliche" filter on /events (t-paliad-128). It composes with
+// the team-visibility predicate (AND) rather than replacing it, so an
+// appointment a user created on a team they have since left still
+// won't leak through.
 type AppointmentListFilter struct {
 	ProjectID *uuid.UUID
 	From      *time.Time
 	To        *time.Time
 	Type      *string
+	CreatedBy *uuid.UUID
 }
 
 // ListVisibleForUser returns all Appointments the user can see (personal +
@@ -122,6 +129,10 @@ func (s *AppointmentService) ListVisibleForUser(ctx context.Context, userID uuid
 		conds = append(conds, `t.appointment_type = :type`)
 		args["type"] = *filter.Type
 	}
+	if filter.CreatedBy != nil {
+		conds = append(conds, `t.created_by = :created_by`)
+		args["created_by"] = *filter.CreatedBy
+	}
 
 	query := `
 		SELECT t.id, t.project_id, t.title, t.description, t.start_at, t.end_at,
diff --git a/internal/services/deadline_service.go b/internal/services/deadline_service.go
index 2d54eb8..4a66ea0 100644
--- a/internal/services/deadline_service.go
+++ b/internal/services/deadline_service.go
@@ -101,11 +101,17 @@ const (
 // a deadline matches if it has at least one of EventTypeIDs attached
 // OR (IncludeUntyped && it has none). When BOTH are zero/false the
 // filter is inactive.
+//
+// CreatedBy narrows to deadlines whose `created_by = id`. Backs the
+// "Nur persönliche" filter on /events (t-paliad-128) — applied on top of
+// the team-visibility predicate so a deadline a user created on a team
+// they have since left still doesn't leak through.
 type ListFilter struct {
 	Status         DeadlineStatusFilter
 	ProjectID      *uuid.UUID
 	EventTypeIDs   []uuid.UUID
 	IncludeUntyped bool
+	CreatedBy      *uuid.UUID
 }
 
 // ListVisibleForUser returns Deadlines on every Project the user can see,
@@ -127,6 +133,10 @@ func (s *DeadlineService) ListVisibleForUser(ctx context.Context, userID uuid.UU
 		conds = append(conds, projectDescendantPredicate("p"))
 		args["project_id"] = *filter.ProjectID
 	}
+	if filter.CreatedBy != nil {
+		conds = append(conds, `f.created_by = :created_by`)
+		args["created_by"] = *filter.CreatedBy
+	}
 	if etCond := buildEventTypeFilterClause(filter, args); etCond != "" {
 		conds = append(conds, etCond)
 	}
diff --git a/internal/services/event_service.go b/internal/services/event_service.go
index 849861c..ebc254b 100644
--- a/internal/services/event_service.go
+++ b/internal/services/event_service.go
@@ -50,6 +50,11 @@ func NewEventService(db *sqlx.DB, deadlines *DeadlineService, appointments *Appo
 // EventListFilter narrows ListVisibleForUser. Most fields are type-specific;
 // passing them with Type=Appointment (or vice versa) is a no-op rather than
 // an error so the handler can stay shape-stable across type switches.
+//
+// PersonalOnly narrows BOTH rails to rows whose `created_by` matches the
+// caller — backs the "Nur persönliche" filter on /events (t-paliad-128).
+// When set, ProjectID is ignored (the two are contradictory: personal
+// means "items I created", not "items in some project I picked").
 type EventListFilter struct {
 	Type EventTypeFilter
 
@@ -60,9 +65,10 @@ type EventListFilter struct {
 	AppointmentType *string
 
 	// Common.
-	ProjectID *uuid.UUID
-	From      *time.Time
-	To        *time.Time
+	ProjectID    *uuid.UUID
+	From         *time.Time
+	To           *time.Time
+	PersonalOnly bool
 }
 
 // EventListItem is one row of the unified events list. Type-specific
@@ -113,6 +119,11 @@ func (s *EventService) ListVisibleForUser(ctx context.Context, userID uuid.UUID,
 			EventTypeIDs:   filter.EventTypeIDs,
 			IncludeUntyped: filter.IncludeUntyped,
 		}
+		if filter.PersonalOnly {
+			uid := userID
+			df.CreatedBy = &uid
+			df.ProjectID = nil
+		}
 		rows, err := s.deadlines.ListVisibleForUser(ctx, userID, df)
 		if err != nil {
 			return nil, err
@@ -142,6 +153,11 @@ func (s *EventService) ListVisibleForUser(ctx context.Context, userID uuid.UUID,
 				To:        filter.To,
 				Type:      filter.AppointmentType,
 			}
+			if filter.PersonalOnly {
+				uid := userID
+				af.CreatedBy = &uid
+				af.ProjectID = nil
+			}
 			bounds := computeDeadlineBucketBounds(time.Now().UTC())
 			from, to := bucketAppointmentWindow(filter.Status, bounds)
 			af.From = pickLater(af.From, from)
@@ -301,12 +317,18 @@ func inDateWindow(due time.Time, from, to *time.Time) bool {
 	return true
 }
 
-// EventSummaryFilter narrows SummaryCounts. Today only `Type` and
-// `ProjectID` matter; status/event_type filters intentionally don't shape
-// the bucket counts (the cards are global "what's coming?" indicators).
+// EventSummaryFilter narrows SummaryCounts. Today only `Type`,
+// `ProjectID`, and `PersonalOnly` matter; status/event_type filters
+// intentionally don't shape the bucket counts (the cards are global
+// "what's coming?" indicators).
+//
+// PersonalOnly mirrors EventListFilter.PersonalOnly — narrows both
+// bucket queries to rows the caller created. ProjectID is ignored when
+// PersonalOnly is set.
 type EventSummaryFilter struct {
-	Type      EventTypeFilter
-	ProjectID *uuid.UUID
+	Type         EventTypeFilter
+	ProjectID    *uuid.UUID
+	PersonalOnly bool
 }
 
 // EventSummary is the response shape of /api/events/summary. Either side
@@ -377,8 +399,15 @@ func (s *EventService) SummaryCounts(ctx context.Context, userID uuid.UUID, filt
 
 	bounds := computeDeadlineBucketBounds(time.Now().UTC())
 
+	projectID := filter.ProjectID
+	if filter.PersonalOnly {
+		// PersonalOnly is mutually exclusive with ProjectID — see the
+		// EventSummaryFilter doc comment.
+		projectID = nil
+	}
+
 	if wantDeadlines {
-		buckets, err := s.deadlineBuckets(ctx, userID, filter.ProjectID, bounds)
+		buckets, err := s.deadlineBuckets(ctx, userID, projectID, bounds, filter.PersonalOnly)
 		if err != nil {
 			return nil, err
 		}
@@ -386,7 +415,7 @@ func (s *EventService) SummaryCounts(ctx context.Context, userID uuid.UUID, filt
 	}
 
 	if wantAppointments {
-		buckets, err := s.appointmentBuckets(ctx, userID, filter.ProjectID, bounds)
+		buckets, err := s.appointmentBuckets(ctx, userID, projectID, bounds, filter.PersonalOnly)
 		if err != nil {
 			return nil, err
 		}
@@ -396,7 +425,7 @@ func (s *EventService) SummaryCounts(ctx context.Context, userID uuid.UUID, filt
 	return out, nil
 }
 
-func (s *EventService) deadlineBuckets(ctx context.Context, userID uuid.UUID, projectID *uuid.UUID, b deadlineBucketBounds) (*DeadlineBuckets, error) {
+func (s *EventService) deadlineBuckets(ctx context.Context, userID uuid.UUID, projectID *uuid.UUID, b deadlineBucketBounds, personalOnly bool) (*DeadlineBuckets, error) {
 	conds := []string{visibilityPredicate("p")}
 	args := map[string]any{
 		"user_id":     userID,
@@ -409,6 +438,9 @@ func (s *EventService) deadlineBuckets(ctx context.Context, userID uuid.UUID, pr
 		conds = append(conds, projectDescendantPredicate("p"))
 		args["project_id"] = *projectID
 	}
+	if personalOnly {
+		conds = append(conds, `f.created_by = :user_id`)
+	}
 
 	query := `
 		SELECT
@@ -436,7 +468,7 @@ func (s *EventService) deadlineBuckets(ctx context.Context, userID uuid.UUID, pr
 	return &c, nil
 }
 
-func (s *EventService) appointmentBuckets(ctx context.Context, userID uuid.UUID, projectID *uuid.UUID, b deadlineBucketBounds) (*AppointmentBuckets, error) {
+func (s *EventService) appointmentBuckets(ctx context.Context, userID uuid.UUID, projectID *uuid.UUID, b deadlineBucketBounds, personalOnly bool) (*AppointmentBuckets, error) {
 	visibility := `(
 		(t.project_id IS NULL AND t.created_by = :user_id)
 		OR (t.project_id IS NOT NULL AND ` + visibilityPredicate("p") + `)
@@ -453,6 +485,12 @@ func (s *EventService) appointmentBuckets(ctx context.Context, userID uuid.UUID,
 		conds = append(conds, projectDescendantPredicate("p"))
 		args["project_id"] = *projectID
 	}
+	if personalOnly {
+		// Narrow to rows the caller created. AND-joined with the visibility
+		// predicate above so an appointment a user created on a team they
+		// have since left still doesn't leak through.
+		conds = append(conds, `t.created_by = :user_id`)
+	}
 
 	query := `
 		SELECT
diff --git a/internal/services/event_service_test.go b/internal/services/event_service_test.go
index 77d7b9e..f866929 100644
--- a/internal/services/event_service_test.go
+++ b/internal/services/event_service_test.go
@@ -154,41 +154,49 @@ func TestEventService_ListAndSummary_Live(t *testing.T) {
 
 	ctx := context.Background()
 	adminID := uuid.New()
+	otherID := uuid.New() // co-admin used to seed items NOT created by adminID
 	projectID := uuid.New()
-	d1 := uuid.New() // overdue pending
-	d2 := uuid.New() // today pending
-	d3 := uuid.New() // next week pending
-	d4 := uuid.New() // completed
-	a1 := uuid.New() // today appointment
-	a2 := uuid.New() // later appointment
+	projectID2 := uuid.New() // second project so personal_only crosses projects
+	d1 := uuid.New()         // overdue pending (admin)
+	d2 := uuid.New()         // today pending (admin)
+	d3 := uuid.New()         // next week pending (admin)
+	d4 := uuid.New()         // completed (admin)
+	d5 := uuid.New()         // pending in projectID created by otherID
+	d6 := uuid.New()         // pending in projectID2 created by adminID
+	a1 := uuid.New()         // today appointment (admin, projectID)
+	a2 := uuid.New()         // later appointment (admin, projectID)
+	a3 := uuid.New()         // soon appointment created by otherID (projectID)
+	a4 := uuid.New()         // personal calendar appointment by adminID (no project)
 
 	cleanup := func() {
-		pool.ExecContext(ctx, `DELETE FROM paliad.appointments WHERE id IN ($1, $2)`, a1, a2)
-		pool.ExecContext(ctx, `DELETE FROM paliad.deadlines    WHERE id IN ($1, $2, $3, $4)`, d1, d2, d3, d4)
-		pool.ExecContext(ctx, `DELETE FROM paliad.project_events WHERE project_id = $1`, projectID)
-		pool.ExecContext(ctx, `DELETE FROM paliad.project_teams WHERE project_id = $1`, projectID)
-		pool.ExecContext(ctx, `DELETE FROM paliad.projects      WHERE id = $1`, projectID)
-		pool.ExecContext(ctx, `DELETE FROM paliad.users         WHERE id = $1`, adminID)
-		pool.ExecContext(ctx, `DELETE FROM auth.users           WHERE id = $1`, adminID)
+		pool.ExecContext(ctx, `DELETE FROM paliad.appointments WHERE id IN ($1, $2, $3, $4)`, a1, a2, a3, a4)
+		pool.ExecContext(ctx, `DELETE FROM paliad.deadlines    WHERE id IN ($1, $2, $3, $4, $5, $6)`, d1, d2, d3, d4, d5, d6)
+		pool.ExecContext(ctx, `DELETE FROM paliad.project_events WHERE project_id IN ($1, $2)`, projectID, projectID2)
+		pool.ExecContext(ctx, `DELETE FROM paliad.project_teams WHERE project_id IN ($1, $2)`, projectID, projectID2)
+		pool.ExecContext(ctx, `DELETE FROM paliad.projects      WHERE id IN ($1, $2)`, projectID, projectID2)
+		pool.ExecContext(ctx, `DELETE FROM paliad.users         WHERE id IN ($1, $2)`, adminID, otherID)
+		pool.ExecContext(ctx, `DELETE FROM auth.users           WHERE id IN ($1, $2)`, adminID, otherID)
 	}
 	cleanup()
 	defer cleanup()
 
 	if _, err := pool.ExecContext(ctx,
-		`INSERT INTO auth.users (id, email) VALUES ($1, $2)`,
-		adminID, "vis-events@hlc.com"); err != nil {
+		`INSERT INTO auth.users (id, email) VALUES ($1, $2), ($3, $4)`,
+		adminID, "vis-events@hlc.com", otherID, "vis-events-other@hlc.com"); err != nil {
 		t.Fatalf("seed auth.users: %v", err)
 	}
 	if _, err := pool.ExecContext(ctx,
 		`INSERT INTO paliad.users (id, email, display_name, office, global_role, lang)
-		 VALUES ($1, $2, 'Vis Events', 'munich', 'global_admin', 'de')`,
-		adminID, "vis-events@hlc.com"); err != nil {
+		 VALUES ($1, $2, 'Vis Events', 'munich', 'global_admin', 'de'),
+		        ($3, $4, 'Vis Events Other', 'munich', 'global_admin', 'de')`,
+		adminID, "vis-events@hlc.com", otherID, "vis-events-other@hlc.com"); err != nil {
 		t.Fatalf("seed paliad.users: %v", err)
 	}
 	if _, err := pool.ExecContext(ctx,
 		`INSERT INTO paliad.projects (id, type, path, title, reference, status, created_by)
-		 VALUES ($1, 'project', $1::text, 'Vis Events Project', '2026/9994', 'active', $2)`,
-		projectID, adminID); err != nil {
+		 VALUES ($1, 'project', $1::text, 'Vis Events Project', '2026/9994', 'active', $2),
+		        ($3, 'project', $3::text, 'Vis Events Project 2', '2026/9995', 'active', $2)`,
+		projectID, adminID, projectID2); err != nil {
 		t.Fatalf("seed paliad.projects: %v", err)
 	}
 
@@ -198,40 +206,54 @@ func TestEventService_ListAndSummary_Live(t *testing.T) {
 	nextMon := today.AddDate(0, 0, ((7-int(today.Weekday()))%7)+1) // Mon-of-next-week
 	farFuture := today.AddDate(0, 1, 0)
 
-	// Four deadlines spanning each bucket-shape: overdue, today, next_week, completed.
+	// Six deadlines: 4 spanning bucket shapes (admin/projectID), one pending
+	// in projectID created by otherID (so personal_only filters it out), one
+	// pending in projectID2 created by adminID (so personal_only spans
+	// projects).
 	for _, d := range []struct {
-		id     uuid.UUID
-		due    time.Time
-		status string
+		id        uuid.UUID
+		project   uuid.UUID
+		due       time.Time
+		status    string
+		createdBy uuid.UUID
 	}{
-		{d1, yesterday, "pending"},
-		{d2, today, "pending"},
-		{d3, nextMon, "pending"},
-		{d4, today, "completed"},
+		{d1, projectID, yesterday, "pending", adminID},
+		{d2, projectID, today, "pending", adminID},
+		{d3, projectID, nextMon, "pending", adminID},
+		{d4, projectID, today, "completed", adminID},
+		{d5, projectID, nextMon, "pending", otherID},
+		{d6, projectID2, nextMon, "pending", adminID},
 	} {
 		if _, err := pool.ExecContext(ctx,
 			`INSERT INTO paliad.deadlines
 			   (id, project_id, title, due_date, source, status, completed_at, created_by)
 			 VALUES ($1, $2, 'D', $3::date, 'manual', $4,
 			         CASE WHEN $4 = 'completed' THEN $5::timestamptz END, $6)`,
-			d.id, projectID, d.due.Format("2006-01-02"), d.status, now, adminID); err != nil {
+			d.id, d.project, d.due.Format("2006-01-02"), d.status, now, d.createdBy); err != nil {
 			t.Fatalf("seed deadline %s: %v", d.id, err)
 		}
 	}
 
-	// Two appointments: one today, one far in the future.
+	// Four appointments: admin's today + far-future on projectID; otherID's
+	// soon appointment on projectID (foreign creator); admin's personal
+	// calendar entry with NULL project_id.
+	soon := today.Add(36 * time.Hour)
 	for _, a := range []struct {
-		id    uuid.UUID
-		start time.Time
+		id        uuid.UUID
+		project   *uuid.UUID
+		start     time.Time
+		createdBy uuid.UUID
 	}{
-		{a1, today.Add(13 * time.Hour)},
-		{a2, farFuture},
+		{a1, &projectID, today.Add(13 * time.Hour), adminID},
+		{a2, &projectID, farFuture, adminID},
+		{a3, &projectID, soon, otherID},
+		{a4, nil, today.Add(15 * time.Hour), adminID},
 	} {
 		if _, err := pool.ExecContext(ctx,
 			`INSERT INTO paliad.appointments
 			   (id, project_id, title, start_at, appointment_type, created_by)
 			 VALUES ($1, $2, 'A', $3, 'meeting', $4)`,
-			a.id, projectID, a.start, adminID); err != nil {
+			a.id, a.project, a.start, a.createdBy); err != nil {
 			t.Fatalf("seed appointment %s: %v", a.id, err)
 		}
 	}
@@ -432,4 +454,111 @@ func TestEventService_ListAndSummary_Live(t *testing.T) {
 			t.Errorf("deadlines rail must be omitted on type=appointment (got %+v)", s.Deadlines)
 		}
 	})
+
+	// t-paliad-128: PersonalOnly narrows BOTH rails to rows the caller
+	// created. Spans projects (so a deadline created by adminID on
+	// projectID2 still shows up) and excludes rows otherID created on a
+	// project adminID can otherwise see.
+	seedDeadlines := map[uuid.UUID]bool{d1: true, d2: true, d3: true, d4: true, d5: true, d6: true}
+	seedAppointments := map[uuid.UUID]bool{a1: true, a2: true, a3: true, a4: true}
+
+	t.Run("PersonalOnly type=deadline returns only caller-created deadlines across projects", func(t *testing.T) {
+		rows, err := events.ListVisibleForUser(ctx, adminID, EventListFilter{
+			Type:         EventTypeDeadline,
+			PersonalOnly: true,
+		})
+		if err != nil {
+			t.Fatalf("List deadline+personal: %v", err)
+		}
+		seen := map[uuid.UUID]bool{}
+		for _, r := range rows {
+			if !seedDeadlines[r.ID] {
+				continue
+			}
+			if r.Type != "deadline" {
+				t.Errorf("type=deadline returned %q row", r.Type)
+			}
+			if r.CreatedBy == nil || *r.CreatedBy != adminID {
+				t.Errorf("personal_only leaked row %s with created_by=%v", r.ID, r.CreatedBy)
+			}
+			seen[r.ID] = true
+		}
+		// admin's: d1 d2 d3 d4 d6 — all should appear. d5 (otherID) must not.
+		for _, want := range []uuid.UUID{d1, d2, d3, d4, d6} {
+			if !seen[want] {
+				t.Errorf("personal_only dropped admin-created deadline %s", want)
+			}
+		}
+		if seen[d5] {
+			t.Errorf("personal_only must exclude other-created deadline %s", d5)
+		}
+	})
+
+	t.Run("PersonalOnly type=appointment returns only caller-created appointments (with + without project)", func(t *testing.T) {
+		rows, err := events.ListVisibleForUser(ctx, adminID, EventListFilter{
+			Type:         EventTypeAppointment,
+			PersonalOnly: true,
+		})
+		if err != nil {
+			t.Fatalf("List appointment+personal: %v", err)
+		}
+		seen := map[uuid.UUID]bool{}
+		for _, r := range rows {
+			if !seedAppointments[r.ID] {
+				continue
+			}
+			if r.Type != "appointment" {
+				t.Errorf("type=appointment returned %q row", r.Type)
+			}
+			if r.CreatedBy == nil || *r.CreatedBy != adminID {
+				t.Errorf("personal_only leaked row %s with created_by=%v", r.ID, r.CreatedBy)
+			}
+			seen[r.ID] = true
+		}
+		// admin's: a1, a2 (project-attached), a4 (no project). a3 (otherID) must not.
+		for _, want := range []uuid.UUID{a1, a2, a4} {
+			if !seen[want] {
+				t.Errorf("personal_only dropped admin-created appointment %s", want)
+			}
+		}
+		if seen[a3] {
+			t.Errorf("personal_only must exclude other-created appointment %s", a3)
+		}
+	})
+
+	t.Run("PersonalOnly type=all returns the union of both", func(t *testing.T) {
+		rows, err := events.ListVisibleForUser(ctx, adminID, EventListFilter{
+			Type:         EventTypeAll,
+			PersonalOnly: true,
+		})
+		if err != nil {
+			t.Fatalf("List all+personal: %v", err)
+		}
+		seenD := map[uuid.UUID]bool{}
+		seenA := map[uuid.UUID]bool{}
+		for _, r := range rows {
+			if r.CreatedBy == nil || *r.CreatedBy != adminID {
+				if seedDeadlines[r.ID] || seedAppointments[r.ID] {
+					t.Errorf("personal_only leaked row %s with created_by=%v", r.ID, r.CreatedBy)
+				}
+				continue
+			}
+			if r.Type == "deadline" && seedDeadlines[r.ID] {
+				seenD[r.ID] = true
+			}
+			if r.Type == "appointment" && seedAppointments[r.ID] {
+				seenA[r.ID] = true
+			}
+		}
+		for _, want := range []uuid.UUID{d1, d2, d3, d4, d6} {
+			if !seenD[want] {
+				t.Errorf("personal_only union dropped admin-created deadline %s", want)
+			}
+		}
+		for _, want := range []uuid.UUID{a1, a2, a4} {
+			if !seenA[want] {
+				t.Errorf("personal_only union dropped admin-created appointment %s", want)
+			}
+		}
+	})
 }