Manage notification channels instead of an ntfy topic

Mirrors the server's channels API: add/remove channels per user from the Users
section. Requires the matching server release.

Claude-Session: https://claude.ai/code/session_016mBLURvJoMuUEr9cB2RpUN

internal/tui/model.go

@@ -48,7 +48,9 @@ const (
 	modeUserPicker
 	modeTeamPicker
 	modeUserCreate
-	modeUserNotifyEdit
+	modeChannelMenu
+	modeChannelAdd
+	modeChannelRemoveByID
 	modeAPIKeyMenu
 	modeAPIKeyCreate
 	modeAPIKeyReveal
@@ -356,7 +358,8 @@ type Model struct {
 	selectedUser      api.User
 	userFormInputs    [2]textinput.Model
 	userFormFocus     int
-	ntfyTopicInput    textinput.Model
+	channelAddInput   textinput.Model
+	channelRemoveIn   textinput.Model
 	apiKeyNameInput   textinput.Model
 	apiKeyRevokeInput textinput.Model
 	revealedAPIKey    api.APIKey
@@ -424,9 +427,13 @@ func NewModel(client *api.Client, serverURL string, refreshInterval time.Duratio
 	emailIn.Placeholder = "email"
 	emailIn.CharLimit = 128
 
-	topicIn := textinput.New()
-	topicIn.Placeholder = "ntfy topic — empty clears it"
-	topicIn.CharLimit = 128
+	channelIn := textinput.New()
+	channelIn.Placeholder = "type:address, e.g. ntfy:my-topic"
+	channelIn.CharLimit = 160
+
+	channelRemoveIn := textinput.New()
+	channelRemoveIn.Placeholder = "integer channel ID"
+	channelRemoveIn.CharLimit = 20
 
 	keyNameIn := textinput.New()
 	keyNameIn.Placeholder = "key name (e.g. laptop)"
@@ -458,7 +465,7 @@ func NewModel(client *api.Client, serverURL string, refreshInterval time.Duratio
 	}
 
 	for _, in := range []*textinput.Model{
-		&noteIn, &snoozeIn, &usernameIn, &emailIn, &topicIn, &keyNameIn, &revokeIn,
+		&noteIn, &snoozeIn, &usernameIn, &emailIn, &channelIn, &channelRemoveIn, &keyNameIn, &revokeIn,
 	} {
 		*in = st.Input(*in)
 	}
@@ -507,7 +514,8 @@ func NewModel(client *api.Client, serverURL string, refreshInterval time.Duratio
 		teamPickerTable:   teamPickerT,
 		userManageTable:   manageT,
 		userFormInputs:    [2]textinput.Model{usernameIn, emailIn},
-		ntfyTopicInput:    topicIn,
+		channelAddInput:   channelIn,
+		channelRemoveIn:   channelRemoveIn,
 		apiKeyNameInput:   keyNameIn,
 		apiKeyRevokeInput: revokeIn,
 		pwInputs:          pwIn,
@@ -668,11 +676,11 @@ func (m *Model) rebuildUserManageTable() {
 	m.userManageTable.SetColumns(userManageColumns(m.width))
 	rows := make([]table.Row, len(m.users))
 	for i, u := range m.users {
-		topic := u.Topic()
-		if topic == "" {
-			topic = "—"
+		channels := u.ChannelSummary()
+		if channels == "" {
+			channels = "—"
 		}
-		rows[i] = table.Row{u.Username, u.Email, topic, userFlags(u), u.CreatedAt.UTC().Format("2006-01-02")}
+		rows[i] = table.Row{u.Username, u.Email, channels, userFlags(u), u.CreatedAt.UTC().Format("2006-01-02")}
 	}
 	setRows(&m.userManageTable, rows)
 	m.userManageTable.SetHeight(tableHeight(m.height, 10))
@@ -768,7 +776,7 @@ func (m Model) canEditSchedule(t api.Team) bool {
 }
 
 // canManageUser mirrors the server's self-or-admin rule for a user's password,
-// ntfy topic and API keys.
+// notification channels and API keys.
 func (m Model) canManageUser(u api.User) bool {
 	return m.isAdmin || u.ID == m.meID
 }
@@ -940,17 +948,17 @@ func teamPickerColumns(width int) []table.Column {
 func userManageColumns(width int) []table.Column {
 	createdW := 12
 	usernameW := 25
-	topicW := 22
+	channelsW := 22
 	flagsW := 14
 	// 10 = bubbles' Padding(0, 1) on each of the five cells.
-	emailW := width - usernameW - topicW - flagsW - createdW - 10
+	emailW := width - usernameW - channelsW - flagsW - createdW - 10
 	if emailW < 15 {
 		emailW = 15
 	}
 	return []table.Column{
 		{Title: "Username", Width: usernameW},
 		{Title: "Email", Width: emailW},
-		{Title: "Ntfy Topic", Width: topicW},
+		{Title: "Channels", Width: channelsW},
 		{Title: "Flags", Width: flagsW},
 		{Title: "Created", Width: createdW},
 	}
@@ -1496,12 +1504,25 @@ func createUserCmd(client *api.Client, username, email string) tea.Cmd {
 	}
 }
 
-// setUserNotifyTargetCmd points a user's pages at a topic, or clears it when
-// topic is empty. It re-lists afterwards so the table shows what the server
-// stored rather than what was typed.
-func setUserNotifyTargetCmd(client *api.Client, userID int64, topic string) tea.Cmd {
+// addChannelCmd gives a user a notification channel. It re-lists afterwards so
+// the table shows what the server stored rather than what was typed.
+func addChannelCmd(client *api.Client, userID int64, typ, address string) tea.Cmd {
 	return func() tea.Msg {
-		if _, err := client.SetUserNotifyTarget(userID, topic); err != nil {
+		if _, err := client.AddChannel(userID, typ, address); err != nil {
+			return userActionErrMsg{err}
+		}
+		users, err := client.ListUsers()
+		if err != nil {
+			return userActionErrMsg{err}
+		}
+		return usersFetchedMsg{users: users}
+	}
+}
+
+// removeChannelCmd deletes one of a user's channels and re-lists.
+func removeChannelCmd(client *api.Client, userID, channelID int64) tea.Cmd {
+	return func() tea.Msg {
+		if err := client.RemoveChannel(userID, channelID); err != nil {
 			return userActionErrMsg{err}
 		}
 		users, err := client.ListUsers()

internal/tui/model_test.go

@@ -1,6 +1,7 @@
 package tui
 
 import (
+	"strings"
 	"testing"
 	"time"
 
@@ -196,29 +197,32 @@ func TestAlertRows_ShowIncidentLink(t *testing.T) {
 	}
 }
 
-// A user with no ntfy topic gets no pages of their own — the row has to say so
+// A user with no channel gets no pages of their own — the row has to say so
 // rather than leaving a blank that reads as "not loaded yet".
-func TestUserManageRows_ShowMissingTopic(t *testing.T) {
-	topic := "terdut-niklas"
-	empty := ""
+func TestUserManageRows_ShowMissingChannels(t *testing.T) {
 	m := NewModel(nil, "http://test", time.Minute, theme.GruvboxDark)
 	m.width, m.height = 120, 40
 	m.users = []api.User{
-		{ID: 1, Username: "niklas", NtfyTopic: &topic},
+		{ID: 1, Username: "niklas", Channels: []api.NotificationChannel{
+			{ID: 1, Type: "ntfy", Address: "terdut-niklas", Enabled: true}}},
 		{ID: 2, Username: "alex"},
-		// The server stores a blank topic as NULL, but a stale client or an older
-		// server can still hand one back; it means the same thing.
-		{ID: 3, Username: "sam", NtfyTopic: &empty},
+		{ID: 3, Username: "sam", Channels: []api.NotificationChannel{
+			{ID: 2, Type: "ntfy", Enabled: false}}},
 	}
 	m.rebuildUserManageTable()
 
 	rows := m.userManageTable.Rows()
-	if rows[0][2] != "terdut-niklas" {
-		t.Errorf("expected the topic in the row, got %q", rows[0][2])
+	if rows[0][2] != "ntfy" {
+		t.Errorf("expected the channel kind in the row, got %q", rows[0][2])
 	}
-	if rows[1][2] != "—" || rows[2][2] != "—" {
-		t.Errorf("expected an em dash for nil and empty topics, got %q and %q",
-			rows[1][2], rows[2][2])
+	if strings.Contains(rows[0][2], "terdut-niklas") {
+		t.Errorf("the row must not carry an address, got %q", rows[0][2])
+	}
+	if rows[1][2] != "—" {
+		t.Errorf("expected an em dash for a user with no channel, got %q", rows[1][2])
+	}
+	if rows[2][2] != "ntfy (off)" {
+		t.Errorf("expected a switched-off channel to say so, got %q", rows[2][2])
 	}
 }
 
@@ -228,7 +232,7 @@ func TestUserManageRows_ShowMissingTopic(t *testing.T) {
 func TestColumnWidthsFitTheTerminal(t *testing.T) {
 	for _, width := range []int{100, 110, 140, 200} {
 		// Five cells each, or six once a Team column is added. userManageColumns
-		// is five cells as well: username, email, topic, flags, created.
+		// is five cells as well: username, email, channels, flags, created.
 		for name, tc := range map[string]struct {
 			cols  []table.Column
 			cells int

internal/tui/update.go

@@ -413,12 +413,21 @@ func (m Model) routeKey(msg tea.KeyMsg) (Model, tea.Cmd) {
 		m2, ourCmd := m.handleKey(msg)
 		return m2, tea.Batch(inputCmd, ourCmd)
 
-	case modeUserNotifyEdit:
+	case modeChannelAdd:
 		var inputCmd tea.Cmd
-		m.ntfyTopicInput, inputCmd = m.ntfyTopicInput.Update(msg)
+		m.channelAddInput, inputCmd = m.channelAddInput.Update(msg)
 		m2, ourCmd := m.handleKey(msg)
 		return m2, tea.Batch(inputCmd, ourCmd)
 
+	case modeChannelRemoveByID:
+		var inputCmd tea.Cmd
+		m.channelRemoveIn, inputCmd = m.channelRemoveIn.Update(msg)
+		m2, ourCmd := m.handleKey(msg)
+		return m2, tea.Batch(inputCmd, ourCmd)
+
+	case modeChannelMenu:
+		return m.handleKey(msg)
+
 	case modeAPIKeyCreate:
 		var inputCmd tea.Cmd
 		m.apiKeyNameInput, inputCmd = m.apiKeyNameInput.Update(msg)
@@ -507,8 +516,12 @@ func (m Model) handleKey(msg tea.KeyMsg) (Model, tea.Cmd) {
 		return m.handleTeamPickerKey(msg)
 	case modeUserCreate:
 		return m.handleUserCreateKey(msg)
-	case modeUserNotifyEdit:
-		return m.handleUserNotifyEditKey(msg)
+	case modeChannelMenu:
+		return m.handleChannelMenuKey(msg)
+	case modeChannelAdd:
+		return m.handleChannelAddKey(msg)
+	case modeChannelRemoveByID:
+		return m.handleChannelRemoveKey(msg)
 	case modeAPIKeyMenu:
 		return m.handleAPIKeyMenuKey(msg)
 	case modePasswordSet:
@@ -721,15 +734,10 @@ func (m Model) handleDashboardKey(msg tea.KeyMsg) (Model, tea.Cmd) {
 		}
 		m.selectedUser = m.users[cursor]
 		if !m.canManageUser(m.selectedUser) {
-			cmd := m.refuseUserAction("notification topic")
+			cmd := m.refuseUserAction("notification channels")
 			return m, cmd
 		}
-		// Prefilled with what they have, so editing a topic does not mean
-		// retyping it, and clearing one is a deliberate wipe.
-		m.ntfyTopicInput.SetValue(m.selectedUser.Topic())
-		m.ntfyTopicInput.CursorEnd()
-		m.ntfyTopicInput.Focus()
-		m.mode = modeUserNotifyEdit
+		m.mode = modeChannelMenu
 		return m, nil
 
 	case "k":
@@ -1369,23 +1377,77 @@ func (m Model) handleUserCreateKey(msg tea.KeyMsg) (Model, tea.Cmd) {
 	return m, nil
 }
 
-// handleUserNotifyEditKey edits one user's ntfy topic.
-//
-// Unlike the other forms here, an empty value is not a mistake to reject: it is
-// how a topic is cleared, which the server accepts and treats as NULL.
-func (m Model) handleUserNotifyEditKey(msg tea.KeyMsg) (Model, tea.Cmd) {
+// handleChannelMenuKey is the menu for one user's notification channels: add
+// one, or remove one by its ID. The same shape as the API key menu.
+func (m Model) handleChannelMenuKey(msg tea.KeyMsg) (Model, tea.Cmd) {
 	switch msg.String() {
 	case "esc":
-		m.ntfyTopicInput.Blur()
 		m.mode = modeDashboard
 		return m, nil
 
+	case "a":
+		m.channelAddInput.Reset()
+		m.channelAddInput.Focus()
+		m.mode = modeChannelAdd
+		return m, nil
+
+	case "r":
+		m.channelRemoveIn.Reset()
+		m.channelRemoveIn.Focus()
+		m.mode = modeChannelRemoveByID
+		return m, nil
+	}
+
+	return m, nil
+}
+
+// parseChannelSpec splits "type:address" at the first colon. The address may
+// itself contain colons (a URL-ish topic, say), the type never does.
+func parseChannelSpec(spec string) (typ, address string, ok bool) {
+	typ, address, found := strings.Cut(strings.TrimSpace(spec), ":")
+	typ, address = strings.TrimSpace(typ), strings.TrimSpace(address)
+	return typ, address, found && typ != "" && address != ""
+}
+
+func (m Model) handleChannelAddKey(msg tea.KeyMsg) (Model, tea.Cmd) {
+	switch msg.String() {
+	case "esc":
+		m.channelAddInput.Blur()
+		m.mode = modeChannelMenu
+		return m, nil
+
 	case "enter":
-		topic := strings.TrimSpace(m.ntfyTopicInput.Value())
-		m.ntfyTopicInput.Blur()
+		typ, address, ok := parseChannelSpec(m.channelAddInput.Value())
+		if !ok {
+			m.statusMsg = "use type:address, e.g. ntfy:my-topic"
+			return m, clearStatusCmd()
+		}
+		m.channelAddInput.Blur()
 		m.mode = modeDashboard
 		m.usersLoading = true
-		return m, setUserNotifyTargetCmd(m.client, m.selectedUser.ID, topic)
+		return m, addChannelCmd(m.client, m.selectedUser.ID, typ, address)
+	}
+
+	return m, nil
+}
+
+func (m Model) handleChannelRemoveKey(msg tea.KeyMsg) (Model, tea.Cmd) {
+	switch msg.String() {
+	case "esc":
+		m.channelRemoveIn.Blur()
+		m.mode = modeChannelMenu
+		return m, nil
+
+	case "enter":
+		channelID, err := strconv.ParseInt(strings.TrimSpace(m.channelRemoveIn.Value()), 10, 64)
+		if err != nil || channelID <= 0 {
+			m.statusMsg = "invalid channel ID — must be a positive integer"
+			return m, clearStatusCmd()
+		}
+		m.channelRemoveIn.Blur()
+		m.mode = modeDashboard
+		m.usersLoading = true
+		return m, removeChannelCmd(m.client, m.selectedUser.ID, channelID)
 	}
 
 	return m, nil

internal/tui/update_test.go

@@ -416,7 +416,7 @@ func TestSchedule_ReassigningAPartlyTakenWeekAsksOnce(t *testing.T) {
 	mustContain(t, m.confirmPrompt(), "2 of 7 days are assigned to niklas and sam")
 }
 
-// ── Ntfy topic ────────────────────────────────────────────────────────────
+// ── Notification channels ─────────────────────────────────────────────────
 
 // onUsers puts the model in the Users section with a loaded table.
 func onUsers(users []api.User) Model {
@@ -428,42 +428,96 @@ func onUsers(users []api.User) Model {
 }
 
 func userFixtures() []api.User {
-	topic := "terdut-niklas"
 	return []api.User{
-		{ID: 1, Username: "niklas", Email: "niklas@example.com", NtfyTopic: &topic},
+		{ID: 1, Username: "niklas", Email: "niklas@example.com",
+			Channels: []api.NotificationChannel{{ID: 3, Type: "ntfy", Address: "terdut-niklas", Enabled: true}}},
 		{ID: 2, Username: "alex", Email: "alex@example.com"},
 	}
 }
 
-func TestNotifyTopic_EditPrefillsTheCurrentTopic(t *testing.T) {
+func TestChannels_TOpensTheMenuForTheUserUnderTheCursor(t *testing.T) {
 	m, _ := press(t, onUsers(userFixtures()), "t")
 
-	if m.mode != modeUserNotifyEdit {
-		t.Fatalf("expected the topic editor, got mode %v", m.mode)
+	if m.mode != modeChannelMenu {
+		t.Fatalf("expected the channel menu, got mode %v", m.mode)
 	}
 	if m.selectedUser.ID != 1 {
 		t.Errorf("expected the user under the cursor, got %d", m.selectedUser.ID)
 	}
-	// Prefilled, so editing a topic does not mean retyping it from scratch.
-	if got := m.ntfyTopicInput.Value(); got != "terdut-niklas" {
-		t.Errorf("expected the current topic prefilled, got %q", got)
-	}
 }
 
-// A user with no topic opens an empty field rather than the previous user's.
-func TestNotifyTopic_EditStartsEmptyWhenUnset(t *testing.T) {
-	m := onUsers(userFixtures())
-	m, _ = press(t, m, "t")
+func TestChannels_AddStartsEmptyEveryTime(t *testing.T) {
+	m, _ := press(t, onUsers(userFixtures()), "t")
+	m, _ = press(t, m, "a")
+	if m.mode != modeChannelAdd {
+		t.Fatalf("expected the add form, got mode %v", m.mode)
+	}
+	m = typeInto(t, m, "ntfy:abandoned")
 	m, _ = press(t, m, "esc")
-	m.userManageTable.SetCursor(1)
+	if m.mode != modeChannelMenu {
+		t.Fatalf("escape should go back to the menu, got mode %v", m.mode)
+	}
 
-	m, _ = press(t, m, "t")
-	if got := m.ntfyTopicInput.Value(); got != "" {
-		t.Errorf("expected an empty field for a user with no topic, got %q", got)
+	m, _ = press(t, m, "a")
+	if got := m.channelAddInput.Value(); got != "" {
+		t.Errorf("expected an empty field, got %q", got)
 	}
 }
 
-func TestNotifyTopic_EscapeAbandonsWithoutSaving(t *testing.T) {
+func TestChannels_AddRejectsASpecWithoutTypeAndAddress(t *testing.T) {
+	for _, spec := range []string{"", "ntfy", "ntfy:", ":topic"} {
+		m, _ := press(t, onUsers(userFixtures()), "t")
+		m, _ = press(t, m, "a")
+		m.channelAddInput.SetValue(spec)
+
+		m, cmd := press(t, m, "enter")
+		if m.mode != modeChannelAdd {
+			t.Errorf("%q: expected to stay on the form, got mode %v", spec, m.mode)
+		}
+		if m.statusMsg == "" {
+			t.Errorf("%q: expected an explanation", spec)
+		}
+		_ = cmd // only the status-clearing tick
+	}
+}
+
+func TestChannels_AddSubmitsAndReturnsToTheDashboard(t *testing.T) {
+	m, _ := press(t, onUsers(userFixtures()), "t")
+	m, _ = press(t, m, "a")
+	m.channelAddInput.SetValue("ntfy:my-topic")
+
+	m, cmd := press(t, m, "enter")
+	if cmd == nil {
+		t.Fatal("expected adding a channel to call the server")
+	}
+	if m.mode != modeDashboard {
+		t.Errorf("expected a return to the dashboard, got mode %v", m.mode)
+	}
+}
+
+func TestChannels_RemoveNeedsAPositiveID(t *testing.T) {
+	m, _ := press(t, onUsers(userFixtures()), "t")
+	m, _ = press(t, m, "r")
+	if m.mode != modeChannelRemoveByID {
+		t.Fatalf("expected the remove form, got mode %v", m.mode)
+	}
+
+	for _, bad := range []string{"", "abc", "0", "-3"} {
+		m.channelRemoveIn.SetValue(bad)
+		next, _ := press(t, m, "enter")
+		if next.mode != modeChannelRemoveByID {
+			t.Errorf("%q: expected to stay on the form, got mode %v", bad, next.mode)
+		}
+	}
+
+	m.channelRemoveIn.SetValue("3")
+	m, cmd := press(t, m, "enter")
+	if cmd == nil || m.mode != modeDashboard {
+		t.Errorf("expected a valid ID to call the server and return, mode %v", m.mode)
+	}
+}
+
+func TestChannels_EscapeAbandonsWithoutSaving(t *testing.T) {
 	m, _ := press(t, onUsers(userFixtures()), "t")
 	m, cmd := press(t, m, "esc")
 
@@ -475,23 +529,7 @@ func TestNotifyTopic_EscapeAbandonsWithoutSaving(t *testing.T) {
 	}
 }
 
-// Clearing a topic is a real action, not a no-op: it is how a user is taken off
-// their own topic and back onto the shared fallback. Contrast the snooze prompt,
-// where an empty value means "I changed my mind".
-func TestNotifyTopic_EmptyInputStillSubmits(t *testing.T) {
-	m, _ := press(t, onUsers(userFixtures()), "t")
-	m.ntfyTopicInput.SetValue("")
-
-	m, cmd := press(t, m, "enter")
-	if cmd == nil {
-		t.Fatal("expected clearing the topic to call the server")
-	}
-	if m.mode != modeDashboard {
-		t.Errorf("expected a return to the dashboard, got mode %v", m.mode)
-	}
-}
-
-func TestNotifyTopic_IsUsersSectionOnly(t *testing.T) {
+func TestChannels_IsUsersSectionOnly(t *testing.T) {
 	m := sized()
 	m.activeSection = sectionIncidents
 	if next, cmd := press(t, m, "t"); cmd != nil || next.mode != modeDashboard {

internal/tui/view.go

@@ -161,8 +161,12 @@ func (m Model) renderBody() string {
 		return m.renderTeamPicker()
 	case modeUserCreate:
 		return m.renderUserCreate()
-	case modeUserNotifyEdit:
-		return m.renderUserNotifyEdit()
+	case modeChannelMenu:
+		return m.renderChannelMenu()
+	case modeChannelAdd:
+		return m.renderChannelAdd()
+	case modeChannelRemoveByID:
+		return m.renderChannelRemoveByID()
 	case modeAPIKeyMenu:
 		return m.renderAPIKeyMenu()
 	case modeAPIKeyCreate:
@@ -222,8 +226,14 @@ func (m Model) renderFooter() string {
 	case modeUserCreate:
 		return withStatus("  tab·next field  enter·create  esc·cancel")
 
-	case modeUserNotifyEdit:
-		return withStatus("  enter·save  esc·cancel   (empty clears the topic)")
+	case modeChannelMenu:
+		return withStatus("  a·add a channel  r·remove by ID  esc·back")
+
+	case modeChannelAdd:
+		return withStatus("  enter·add  esc·back   (type:address)")
+
+	case modeChannelRemoveByID:
+		return withStatus("  enter·remove  esc·back")
 
 	case modeAPIKeyMenu:
 		return withStatus("  n·new key  r·revoke by ID  esc·back")
@@ -256,7 +266,7 @@ func (m Model) renderFooter() string {
 		case sectionSchedule:
 			return withStatus("  +·assign day  W·assign week  d·del  ←/→·shift week  " + m.teamHint() + "tab·section  r·refresh  q·quit")
 		case sectionUsers:
-			return withStatus("  n·new user  t·topic  d·delete  k·API keys  p·password  r·refresh  L·sign out  q·quit")
+			return withStatus("  n·new user  t·channels  d·delete  k·API keys  p·password  r·refresh  L·sign out  q·quit")
 		}
 		return "\n" + m.styles.Footer.Render(m.help.ShortHelpView(m.keys.ShortHelp()))
 	}
@@ -748,10 +758,10 @@ func eventLabel(e api.IncidentEvent) string {
 		return "  Resolved (all alerts stopped firing)"
 	case api.EventNotified:
 		// An empty username here is not "the server acted": it means the page
-		// went to the shared fallback topic, so it belongs to nobody.
+		// went to the shared fallback, so it belongs to nobody.
 		return fmt.Sprintf("  Notified %s%s", notifiedTarget(who), notifyKind(e.Detail))
 	case api.EventNotifyFailed:
-		// The detail is "<kind>: <reason>", and the reason is the point — it is
+		// The detail is "<kind> via <channel>: <reason>", and the reason is the point — it is
 		// the only thing that says why nobody's phone rang.
 		return truncate(fmt.Sprintf("  Notification to %s failed · %s",
 			notifiedTarget(who), e.Detail), 52)
@@ -767,11 +777,11 @@ func eventLabel(e api.IncidentEvent) string {
 }
 
 // notifiedTarget names who a page reached. The server attaches no user when it
-// published to the shared fallback topic, and saying so is the difference
+// published to the shared fallback, and saying so is the difference
 // between "somebody was paged" and "the on-call rota was empty".
 func notifiedTarget(username string) string {
 	if username == "" {
-		return "the fallback topic"
+		return "the fallback"
 	}
 	return username
 }
@@ -959,14 +969,44 @@ func (m Model) renderUserCreate() string {
 		emailLabel + m.userFormInputs[1].View() + "\n"
 }
 
-func (m Model) renderUserNotifyEdit() string {
-	header := fmt.Sprintf("\n  Push notifications for %s\n", m.styles.Bold.Render(m.selectedUser.Username))
+func (m Model) renderChannelMenu() string {
+	header := fmt.Sprintf("\n  Notification channels for %s\n\n", m.styles.Bold.Render(m.selectedUser.Username))
+	var list string
+	if len(m.selectedUser.Channels) == 0 {
+		list = line(m.styles.Muted, "  None — their incidents page the server's shared fallback,\n"+
+			"  which carries no Acknowledge button.")
+	}
+	for _, c := range m.selectedUser.Channels {
+		state := ""
+		if !c.Enabled {
+			state = "  (off)"
+		}
+		// The address is only sent to its owner; an administrator sees the kind.
+		address := c.Address
+		if address == "" {
+			address = "(address hidden)"
+		}
+		list += fmt.Sprintf("  %s  %s  %s%s\n", m.styles.Accent.Render(fmt.Sprintf("#%d", c.ID)), c.Type, address, state)
+	}
+	options := "\n" +
+		m.styles.Accent.Render("  a") + "  · add a channel (type:address, e.g. ntfy:my-topic)\n" +
+		m.styles.Accent.Render("  r") + "  · remove a channel by ID\n"
+	return header + list + options
+}
+
+func (m Model) renderChannelAdd() string {
+	header := fmt.Sprintf("\n  New channel for %s\n\n", m.styles.Bold.Render(m.selectedUser.Username))
 	hint := line(m.styles.Muted,
-		"  The ntfy topic this user's pages go to. Leave it empty to clear it —\n"+
-			"  their incidents then page the server's shared fallback topic, which\n"+
-			"  carries no Acknowledge button.")
-	label := m.styles.Selected.Render("  Topic:  ")
-	return header + "\n" + hint + "\n" + label + m.ntfyTopicInput.View() + "\n"
+		"  The kind of channel, a colon, then where it goes — for ntfy, the topic.\n"+
+			"  Only kinds the server has configured are accepted.")
+	label := m.styles.Selected.Render("  Channel:  ")
+	return header + hint + "\n" + label + m.channelAddInput.View() + "\n"
+}
+
+func (m Model) renderChannelRemoveByID() string {
+	header := fmt.Sprintf("\n  Remove a channel from %s\n\n", m.styles.Bold.Render(m.selectedUser.Username))
+	label := m.styles.Selected.Render("  Channel ID:  ")
+	return header + label + m.channelRemoveIn.View() + "\n"
 }
 
 func (m Model) renderPasswordSet() string {

internal/tui/view_test.go

@@ -184,14 +184,17 @@ func TestEventLabel_KnownTypes(t *testing.T) {
 			"Notified bo (triggered)"},
 		{api.IncidentEvent{Type: api.EventNotified, Username: "bo", Detail: "reminder"},
 			"Notified bo (reminder)"},
-		// On a notification, no user means the shared fallback topic — not that
+		// The server names the channel type after the kind.
+		{api.IncidentEvent{Type: api.EventNotified, Username: "bo", Detail: "triggered via ntfy"},
+			"Notified bo (triggered via ntfy)"},
+		// On a notification, no user means the shared fallback — not that
 		// the server acted on its own.
 		{api.IncidentEvent{Type: api.EventNotified, Detail: "triggered"},
-			"Notified the fallback topic (triggered)"},
-		{api.IncidentEvent{Type: api.EventNotifyFailed, Username: "bo", Detail: "triggered: ntfy returned 502"},
+			"Notified the fallback (triggered)"},
+		{api.IncidentEvent{Type: api.EventNotifyFailed, Username: "bo", Detail: "triggered via ntfy: ntfy returned 502"},
 			"Notification to bo failed"},
 		{api.IncidentEvent{Type: api.EventNotifyFailed, Detail: "triggered: no route to host"},
-			"Notification to the fallback topic failed"},
+			"Notification to the fallback failed"},
 	}
 	for _, tt := range tests {
 		t.Run(tt.event.Type, func(t *testing.T) {
@@ -216,14 +219,45 @@ func TestIncidentDetail_RendersNotifications(t *testing.T) {
 	mustContain(t, got, "Notified niklas (triggered)", "Notification to niklas failed")
 }
 
-func TestUserNotifyEdit_SaysWhatAnEmptyValueDoes(t *testing.T) {
+func TestChannelMenu_ListsKindsAndSaysWhenThereAreNone(t *testing.T) {
 	m := sized()
-	m.mode = modeUserNotifyEdit
+	m.mode = modeChannelMenu
 	m.selectedUser = api.User{ID: 1, Username: "niklas"}
 
-	mustContain(t, m.View(), "niklas", "empty to clear it", "fallback topic")
-	// The footer has to repeat it: that is where the reader looks for what a key does.
-	mustContain(t, m.renderFooter(), "empty clears the topic")
+	mustContain(t, m.View(), "niklas", "None", "fallback", "add a channel", "remove a channel")
+	mustContain(t, m.renderFooter(), "add a channel", "remove by ID")
+
+	// An administrator sees the kind and ID of somebody else's channel, never where it goes.
+	m.selectedUser.Channels = []api.NotificationChannel{{ID: 7, Type: "ntfy", Enabled: false}}
+	mustContain(t, m.View(), "#7", "ntfy", "(address hidden)", "(off)")
+}
+
+func TestChannelAdd_ExplainsTheSpec(t *testing.T) {
+	m := sized()
+	m.mode = modeChannelAdd
+	m.selectedUser = api.User{ID: 1, Username: "niklas"}
+
+	mustContain(t, m.View(), "niklas", "type", "colon")
+	mustContain(t, m.renderFooter(), "type:address")
+}
+
+func TestParseChannelSpec(t *testing.T) {
+	for spec, want := range map[string][2]string{
+		"ntfy:my-topic":      {"ntfy", "my-topic"},
+		"  ntfy : my-topic ": {"ntfy", "my-topic"},
+		"mail:a@b.example":   {"mail", "a@b.example"},
+		"ntfy:a:b":           {"ntfy", "a:b"},
+	} {
+		typ, address, ok := parseChannelSpec(spec)
+		if !ok || typ != want[0] || address != want[1] {
+			t.Errorf("%q: got %q, %q, %v", spec, typ, address, ok)
+		}
+	}
+	for _, bad := range []string{"", "ntfy", "ntfy:", ":topic", "   "} {
+		if _, _, ok := parseChannelSpec(bad); ok {
+			t.Errorf("%q should not parse", bad)
+		}
+	}
 }
 
 func TestAlertDetail_SaysItIsReadOnlyAndLinksTheIncident(t *testing.T) {