# Profile Deletion Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Let a signed-in geniusrun user permanently delete their entire account (Garmin credentials, custom rules, every synced activity) from a "Danger zone" button on the Profile page, and log them out afterward.

**Architecture:** Add `ON DELETE CASCADE` to every FK pointing at `users(id)` (and `workout_kinds(id)`) in `schema.sql`, so a single `DELETE FROM users` removes everything. Wrap that in a new `store.DeleteUser`, expose it via `DELETE /api/profile`, and have that handler also tear down the deleted user's cached Garmin subprocess/client and on-disk token-store directory. The frontend gates the call behind a type-`DELETE`-to-confirm UI, then performs a real POST navigation to the existing `/api/session/logout` route (the same one the header's Log out button already uses) so the OIDC session ends too.

**Tech Stack:** Go (`net/http`, `database/sql` via `modernc.org/sqlite`, chi router), React + TypeScript (Vite), no frontend test framework.

## Global Constraints

- `internal/store/schema.sql` is edited directly, never migrated — this is a pre-production app (see `CLAUDE.md`).
- Every store/API method that touches per-user data takes an explicit `userID` and must filter/scope by it — the entire cross-user isolation boundary depends on this (see `CLAUDE.md`'s Authentication section).
- Cross-user isolation must be tested adversarially (two real users, real IDs), not just checked for non-collision — matches `internal/store/isolation_test.go` / `internal/api/isolation_test.go` convention.
- After any `schema.sql` change, regenerate `docs/DATABASE.md` via `go run ./cmd/dumpschema` (run from `backend/`).
- `gofmt -l .` must report nothing before committing; `go vet ./...` and `go build ./...` must pass.
- No frontend test suite exists — frontend changes are verified via `npm run build`, `npm run lint`, and a manual browser check.

---

### Task 1: Cascading deletes in the store layer

**Files:**
- Modify: `backend/internal/store/schema.sql:29,85,103,121,222,232`
- Modify: `backend/internal/store/users.go` (add `DeleteUser`)
- Modify: `backend/internal/store/users_test.go` (add `TestDeleteUser_RemovesUserAndCascadesEverything`)
- Modify: `backend/internal/store/isolation_test.go` (add `TestIsolation_DeleteUserLeavesOtherUsersDataIntact`)
- Modify: `docs/DATABASE.md` (regenerated, not hand-edited)

**Interfaces:**
- Produces: `func (db *DB) DeleteUser(ctx context.Context, userID int64) error` — deletes the `users` row for `userID`; every owned row (profile, workout_kinds, workout_type_paces, activities, laps, activity_samples, kind_assignments, sync_state, sync_runs) cascades away via the schema FKs added in this task.

- [ ] **Step 1: Write the failing test**

Add to `backend/internal/store/users_test.go`:

```go
func TestDeleteUser_RemovesUserAndCascadesEverything(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userID, err := db.ProvisionUser(ctx, "delete-me", "Delete Me")
	if err != nil {
		t.Fatalf("ProvisionUser: %v", err)
	}

	activityID, err := db.UpsertActivity(ctx, userID, Activity{GarminActivityID: 1, StartTimeUTC: "2026-07-11 06:00:00", RawJSON: "{}"})
	if err != nil {
		t.Fatalf("UpsertActivity: %v", err)
	}
	kindID, err := db.CreateWorkoutKind(ctx, userID, WorkoutKind{Name: "Test Delete Kind", RuleJSON: `{"match":"all","conditions":[]}`, IsActive: true})
	if err != nil {
		t.Fatalf("CreateWorkoutKind: %v", err)
	}
	if err := db.ReplaceLaps(ctx, userID, activityID, []Lap{{LapIndex: 1}}); err != nil {
		t.Fatalf("ReplaceLaps: %v", err)
	}
	if err := db.ReplaceActivitySamples(ctx, userID, activityID, []Sample{{ElapsedSeconds: 0}}); err != nil {
		t.Fatalf("ReplaceActivitySamples: %v", err)
	}
	if _, err := db.InsertKindAssignment(ctx, userID, KindAssignment{
		ActivityID: activityID, WorkoutKindID: &kindID, AssignmentSource: AssignmentSourceRuleEngine,
		Status: AssignmentStatusAssigned, CandidateKindsJSON: "[]",
	}); err != nil {
		t.Fatalf("InsertKindAssignment: %v", err)
	}
	minPace := 300.0
	if err := db.UpdateWorkoutTypePace(ctx, userID, WorkoutTypePace{WorkoutKindID: kindID, PaceMinSecPerKm: &minPace}); err != nil {
		t.Fatalf("UpdateWorkoutTypePace: %v", err)
	}
	if err := db.UpdateSyncState(ctx, userID, "2020-01-01", true); err != nil {
		t.Fatalf("UpdateSyncState: %v", err)
	}
	if _, err := db.StartSyncRun(ctx, userID, SyncKindBackfill); err != nil {
		t.Fatalf("StartSyncRun: %v", err)
	}

	if err := db.DeleteUser(ctx, userID); err != nil {
		t.Fatalf("DeleteUser: %v", err)
	}

	if _, found, err := db.GetUserBySub(ctx, "delete-me"); err != nil || found {
		t.Fatalf("expected user gone after DeleteUser, found=%v err=%v", found, err)
	}

	checks := []struct {
		query string
		arg   int64
	}{
		{`SELECT COUNT(*) FROM profile WHERE user_id = ?`, userID},
		{`SELECT COUNT(*) FROM workout_kinds WHERE user_id = ?`, userID},
		{`SELECT COUNT(*) FROM workout_type_paces WHERE workout_kind_id = ?`, kindID},
		{`SELECT COUNT(*) FROM activities WHERE user_id = ?`, userID},
		{`SELECT COUNT(*) FROM laps WHERE activity_id = ?`, activityID},
		{`SELECT COUNT(*) FROM activity_samples WHERE activity_id = ?`, activityID},
		{`SELECT COUNT(*) FROM kind_assignments WHERE activity_id = ?`, activityID},
		{`SELECT COUNT(*) FROM sync_state WHERE user_id = ?`, userID},
		{`SELECT COUNT(*) FROM sync_runs WHERE user_id = ?`, userID},
	}
	for _, c := range checks {
		var count int
		if err := db.QueryRowContext(ctx, c.query, c.arg).Scan(&count); err != nil {
			t.Fatalf("count query %q: %v", c.query, err)
		}
		if count != 0 {
			t.Errorf("query %q: got %d rows, want 0 after DeleteUser", c.query, count)
		}
	}
}
```

Add to `backend/internal/store/isolation_test.go`:

```go
// TestIsolation_DeleteUserLeavesOtherUsersDataIntact confirms deleting one
// user's account never touches another user's profile, taxonomy, or
// activities, even though DeleteUser is a single blunt DELETE FROM users.
func TestIsolation_DeleteUserLeavesOtherUsersDataIntact(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}
	if _, err := db.UpsertActivity(ctx, userB, Activity{GarminActivityID: 1, StartTimeUTC: "2026-07-11 06:00:00", RawJSON: "{}"}); err != nil {
		t.Fatalf("UpsertActivity(b): %v", err)
	}

	if err := db.DeleteUser(ctx, userA); err != nil {
		t.Fatalf("DeleteUser(a): %v", err)
	}

	if _, found, err := db.GetUserBySub(ctx, "sub-b"); err != nil || !found {
		t.Fatalf("expected userB to survive userA's deletion, found=%v err=%v", found, err)
	}
	profileB, err := db.GetProfile(ctx, userB)
	if err != nil {
		t.Fatalf("GetProfile(b) after deleting a: %v", err)
	}
	if profileB.Name != "B" {
		t.Errorf("userB's profile changed after deleting userA: %+v", profileB)
	}
	kindsB, err := db.ListWorkoutKinds(ctx, userB, false)
	if err != nil || len(kindsB) != 8 {
		t.Fatalf("userB's taxonomy affected by deleting userA: len=%d err=%v", len(kindsB), err)
	}
	activitiesB, err := db.ListActivities(ctx, userB, ActivityFilter{})
	if err != nil || len(activitiesB) != 1 {
		t.Fatalf("userB's activities affected by deleting userA: len=%d err=%v", len(activitiesB), err)
	}
}
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `cd backend && go test ./internal/store/... -run 'TestDeleteUser|TestIsolation_DeleteUser' -v`
Expected: FAIL — `db.DeleteUser undefined (type *DB has no field or method DeleteUser)`.

- [ ] **Step 3: Add `ON DELETE CASCADE` to schema.sql**

In `backend/internal/store/schema.sql`, change these six lines (each currently ends `REFERENCES users(id),` or `REFERENCES workout_kinds(id),`):

Line 29 (`profile.user_id`), from:
```sql
    user_id             INTEGER NOT NULL REFERENCES users(id),
```
to:
```sql
    user_id             INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
```

Line 85 (`workout_kinds.user_id`), from:
```sql
    user_id     INTEGER NOT NULL REFERENCES users(id),
```
to:
```sql
    user_id     INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
```

Line 103 (`workout_type_paces.workout_kind_id`), from:
```sql
    workout_kind_id     INTEGER PRIMARY KEY REFERENCES workout_kinds(id),
```
to:
```sql
    workout_kind_id     INTEGER PRIMARY KEY REFERENCES workout_kinds(id) ON DELETE CASCADE,
```

Line 121 (`activities.user_id`), from:
```sql
    user_id                    INTEGER NOT NULL REFERENCES users(id),
```
to:
```sql
    user_id                    INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
```

Line 222 (`sync_state.user_id`), from:
```sql
    user_id              INTEGER NOT NULL REFERENCES users(id),
```
to:
```sql
    user_id              INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
```

Line 232 (`sync_runs.user_id`), from:
```sql
    user_id            INTEGER NOT NULL REFERENCES users(id),
```
to:
```sql
    user_id            INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
```

`laps`/`activity_samples`/`kind_assignments` already cascade off `activities(id)` — no change needed there. SQLite's `foreign_keys` pragma is already on for every connection (`db.go`), so these cascades (including the two-level `users → workout_kinds → workout_type_paces` chain) take effect immediately, no code change required for the pragma itself.

- [ ] **Step 4: Add `DeleteUser` to `backend/internal/store/users.go`**

Append after `ProvisionUser` (end of file):

```go

// DeleteUser permanently deletes userID's account. Every row that belongs
// to it -- profile, workout kinds (and their paces), activities (and their
// laps/samples/kind_assignments), sync_state, and sync_runs -- cascades
// away via the ON DELETE CASCADE foreign keys in schema.sql, so this is a
// single statement rather than per-table deletes. Irreversible; the API
// layer gates this behind a UI confirmation (see
// docs/superpowers/specs/2026-07-26-profile-deletion-design.md).
func (db *DB) DeleteUser(ctx context.Context, userID int64) error {
	if _, err := db.ExecContext(ctx, `DELETE FROM users WHERE id = ?`, userID); err != nil {
		return fmt.Errorf("delete user %d: %w", userID, err)
	}
	return nil
}
```

- [ ] **Step 5: Run tests to verify they pass**

Run: `cd backend && go test ./internal/store/... -run 'TestDeleteUser|TestIsolation_DeleteUser' -v`
Expected: PASS.

- [ ] **Step 6: Run the full store test suite**

Run: `cd backend && go test ./internal/store/...`
Expected: PASS (confirms the new `ON DELETE CASCADE` clauses didn't break `ResetAllSyncedData` or any other existing behavior).

- [ ] **Step 7: Regenerate `docs/DATABASE.md`**

Run: `cd backend && go run ./cmd/dumpschema`
Expected: `docs/DATABASE.md` updates to show `ON DELETE CASCADE` on the six changed columns.

- [ ] **Step 8: Commit**

```bash
git add backend/internal/store/schema.sql backend/internal/store/users.go backend/internal/store/users_test.go backend/internal/store/isolation_test.go docs/DATABASE.md
git commit -m "feat(store): add DeleteUser with cascading account deletion"
```

---

### Task 2: `DELETE /api/profile` and Garmin client/tokenstore teardown

**Files:**
- Modify: `backend/internal/api/server.go:5-21` (imports), `:95-117` (new `removeUserClient` after `syncFor`), `:167-170` (route)
- Modify: `backend/internal/api/profile.go` (add `handleDeleteProfile`)
- Modify: `backend/internal/api/api_test.go` (imports + 3 new tests)
- Modify: `backend/internal/api/isolation_test.go` (1 new test)

**Interfaces:**
- Consumes: `store.DB.DeleteUser(ctx, userID) error` (Task 1); `garmin.Client.Close() error` and `.UpdateCredentials` (existing); `Server.userGarmin/userSync/userAuthStatus/userAuthMessage/userSyncRunning map[int64]...` and `Server.mu sync.Mutex` (existing fields); `Server.GarminBase garmin.Config` (existing, has `.TokenStorePath string`).
- Produces: `func (s *Server) removeGarminClient(userID int64)` — used only within this task's handler, not exported further. `DELETE /api/profile` route → `handleDeleteProfile`, responding `204` on success, `409` if a sync is running for that user.

- [ ] **Step 1: Write the failing tests**

Add `"os"` to `backend/internal/api/api_test.go`'s import block (needed for Step 1's token-store test):

```go
import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"testing"
	"time"

	"geniusrun/backend/internal/auth"
	authmock "geniusrun/backend/internal/auth/mock"
	"geniusrun/backend/internal/garmin"
	"geniusrun/backend/internal/garmin/mock"
	"geniusrun/backend/internal/store"
	appsync "geniusrun/backend/internal/sync"
)
```

Append to `backend/internal/api/api_test.go`:

```go
func TestDeleteProfile_DeletesUserAndTerminatesGarminClient(t *testing.T) {
	s, db, userID := newTestServer(t)
	router := s.Router()

	// Force the per-user Garmin client to be built and cached.
	rec := doJSON(t, router, http.MethodPost, "/api/auth/login", nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("auth/login status = %d, body = %s", rec.Code, rec.Body.String())
	}
	client, err := s.garminFor(context.Background(), userID)
	if err != nil {
		t.Fatalf("garminFor: %v", err)
	}
	mockClient, ok := client.(*mock.Client)
	if !ok {
		t.Fatalf("expected *mock.Client, got %T", client)
	}

	rec = doJSON(t, router, http.MethodDelete, "/api/profile", nil)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("delete status = %d, body = %s", rec.Code, rec.Body.String())
	}

	if _, found, err := db.GetUserBySub(context.Background(), "test-user"); err != nil || found {
		t.Fatalf("expected user gone after delete, found=%v err=%v", found, err)
	}
	if !mockClient.ClosedCalled {
		t.Error("expected the cached garmin client to be Close()d on profile deletion")
	}
}

func TestDeleteProfile_RejectsWhileSyncInProgress(t *testing.T) {
	s, db, userID := newTestServer(t)
	s.mu.Lock()
	s.userSyncRunning[userID] = true
	s.mu.Unlock()

	rec := doJSON(t, s.Router(), http.MethodDelete, "/api/profile", nil)
	if rec.Code != http.StatusConflict {
		t.Fatalf("status = %d, want 409, body = %s", rec.Code, rec.Body.String())
	}
	if _, found, err := db.GetUserBySub(context.Background(), "test-user"); err != nil || !found {
		t.Fatalf("expected user to survive a rejected delete, found=%v err=%v", found, err)
	}
}

func TestDeleteProfile_RemovesTokenStoreDirectory(t *testing.T) {
	db, err := store.Open(filepath.Join(t.TempDir(), "geniusrun_test.db"))
	if err != nil {
		t.Fatalf("store.Open: %v", err)
	}
	t.Cleanup(func() { db.Close() })
	userID, err := db.ProvisionUser(context.Background(), "test-user", "Test User")
	if err != nil {
		t.Fatalf("ProvisionUser: %v", err)
	}

	tokenStoreRoot := t.TempDir()
	userTokenDir := filepath.Join(tokenStoreRoot, strconv.FormatInt(userID, 10))
	if err := os.MkdirAll(userTokenDir, 0o755); err != nil {
		t.Fatalf("MkdirAll: %v", err)
	}
	if err := os.WriteFile(filepath.Join(userTokenDir, "session.json"), []byte("{}"), 0o644); err != nil {
		t.Fatalf("WriteFile: %v", err)
	}

	m := &mock.Client{}
	garminFactory := func(garmin.Config) garmin.Client { return m }
	s := NewServer(db, garminFactory, garmin.Config{TokenStorePath: tokenStoreRoot}, appsync.Config{}, &authmock.Verifier{}, testSessionConfig)

	rec := doJSON(t, s.Router(), http.MethodDelete, "/api/profile", nil)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("delete status = %d, body = %s", rec.Code, rec.Body.String())
	}
	if _, err := os.Stat(userTokenDir); !os.IsNotExist(err) {
		t.Fatalf("expected token store dir %q to be removed, stat err = %v", userTokenDir, err)
	}
}
```

Append to `backend/internal/api/isolation_test.go`:

```go
// TestIsolation_DeleteProfileOnlyDeletesOwnAccount confirms one user
// deleting their own profile never touches another user's account, even
// though DeleteUser is keyed purely by the session-resolved userID.
func TestIsolation_DeleteProfileOnlyDeletesOwnAccount(t *testing.T) {
	s, db, userA := newTestServer(t) // provisions "test-user" (userA)
	if _, err := db.ProvisionUser(newCtx(), "user-b", "B"); err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	router := s.Router()
	rec := doJSONAs(t, router, "user-b", http.MethodDelete, "/api/profile", nil)
	if rec.Code != http.StatusNoContent {
		t.Fatalf("userB delete status = %d, body = %s", rec.Code, rec.Body.String())
	}

	if _, found, err := db.GetUserBySub(newCtx(), "user-b"); err != nil || found {
		t.Fatalf("expected userB gone after their own delete, found=%v err=%v", found, err)
	}
	u, found, err := db.GetUserBySub(newCtx(), "test-user")
	if err != nil || !found || u.ID != userA {
		t.Fatalf("expected userA to survive userB's deletion, found=%v err=%v id=%d want=%d", found, err, u.ID, userA)
	}
	rec = doJSON(t, router, http.MethodGet, "/api/profile", nil) // as userA
	if rec.Code != http.StatusOK {
		t.Fatalf("userA profile status after userB deleted themselves = %d, body = %s", rec.Code, rec.Body.String())
	}
}
```

- [ ] **Step 2: Run tests to verify they fail**

Run: `cd backend && go test ./internal/api/... -run 'TestDeleteProfile|TestIsolation_DeleteProfile' -v`
Expected: FAIL — 404s (no `DELETE /api/profile` route registered yet).

- [ ] **Step 3: Add the `os` import and `removeUserClient` to `server.go`**

Change the import block (add `"os"` between `"net/http"` and `"path/filepath"`):

```go
import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"sync"

	"github.com/go-chi/chi/v5"

	"geniusrun/backend/internal/auth"
	"geniusrun/backend/internal/garmin"
	"geniusrun/backend/internal/store"
	appsync "geniusrun/backend/internal/sync"
)
```

Insert this new method right after `syncFor` (i.e. between the existing `syncFor` closing brace and the `RunIncrementalSyncForAllUsers` doc comment):

```go

// removeGarminClient drops userID's cached garmin.Client/sync.Service (if
// any) and every other per-user in-memory entry for userID, terminating the
// client's subprocess and best-effort removing its on-disk token-store
// directory. Called when a user's account has just been deleted from the
// DB, so nothing in memory keeps referencing a userID that no longer
// exists.
func (s *Server) removeGarminClient(userID int64) {
	s.mu.Lock()
	client, ok := s.userGarmin[userID]
	delete(s.userGarmin, userID)
	delete(s.userSync, userID)
	delete(s.userAuthStatus, userID)
	delete(s.userAuthMessage, userID)
	delete(s.userSyncRunning, userID)
	s.mu.Unlock()

	if ok {
		if err := client.Close(); err != nil {
			log.Printf("api: close garmin client for deleted user %d: %v", userID, err)
		}
	}
	if s.GarminBase.TokenStorePath == "" {
		return
	}
	tokenStoreDir := filepath.Join(s.GarminBase.TokenStorePath, strconv.FormatInt(userID, 10))
	if err := os.RemoveAll(tokenStoreDir); err != nil {
		log.Printf("api: remove token store dir for deleted user %d: %v", userID, err)
	}
}
```

- [ ] **Step 4: Register the route in `Router()`**

In `server.go`, change:

```go
				r.Route("/profile", func(r chi.Router) {
					r.Get("/", s.handleGetProfile)
					r.Put("/", s.handleUpdateProfile)
				})
```

to:

```go
				r.Route("/profile", func(r chi.Router) {
					r.Get("/", s.handleGetProfile)
					r.Put("/", s.handleUpdateProfile)
					r.Delete("/", s.handleDeleteProfile)
				})
```

- [ ] **Step 5: Add `handleDeleteProfile` to `profile.go`**

Append to `backend/internal/api/profile.go`:

```go

// handleDeleteProfile permanently deletes the signed-in user's entire
// geniusrun account (profile, workout kinds/paces, activities and
// everything under them, sync state/runs -- see schema.sql's ON DELETE
// CASCADE from users(id)) and tears down their cached Garmin client and
// token-store directory. It does not touch the session cookie itself --
// the frontend follows a successful call with a real logout navigation
// (see docs/superpowers/specs/2026-07-26-profile-deletion-design.md).
func (s *Server) handleDeleteProfile(w http.ResponseWriter, r *http.Request) {
	userID := userIDFromContext(r.Context())

	s.mu.Lock()
	inProgress := s.userSyncRunning[userID]
	s.mu.Unlock()
	if inProgress {
		writeError(w, http.StatusConflict, "a sync is in progress for this account; wait for it to finish before deleting your profile")
		return
	}

	if err := s.DB.DeleteUser(r.Context(), userID); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	s.removeGarminClient(userID)
	w.WriteHeader(http.StatusNoContent)
}
```

- [ ] **Step 6: Run tests to verify they pass**

Run: `cd backend && go test ./internal/api/... -run 'TestDeleteProfile|TestIsolation_DeleteProfile' -v`
Expected: PASS.

- [ ] **Step 7: Run the full backend test suite**

Run: `cd backend && go build ./... && go vet ./... && gofmt -l . && go test ./...`
Expected: `gofmt -l .` prints nothing; `go build`/`go vet`/`go test` all succeed.

- [ ] **Step 8: Commit**

```bash
git add backend/internal/api/server.go backend/internal/api/profile.go backend/internal/api/api_test.go backend/internal/api/isolation_test.go
git commit -m "feat(api): add DELETE /api/profile with Garmin client/tokenstore teardown"
```

---

### Task 3: Frontend Danger zone UI

**Files:**
- Modify: `frontend/src/api/client.ts` (add `deleteProfile`)
- Modify: `frontend/src/pages/Profile.tsx` (add Danger zone fieldset + confirm flow)
- Modify: `frontend/src/App.css` (small `.danger-zone-confirm` rule)

**Interfaces:**
- Consumes: `DELETE /api/profile` (Task 2, returns `204` or throws via the existing `request()` helper's non-2xx handling); `BASE_URL` (already exported from `client.ts`).
- Produces: `api.deleteProfile(): Promise<void>`, used only from `Profile.tsx`.

- [ ] **Step 1: Add `deleteProfile` to the API client**

In `frontend/src/api/client.ts`, in the `// Profile` section, change:

```ts
  // Profile
  getProfile: () => request<Profile>("/api/profile"),
  updateProfile: (profile: Profile) =>
    request<Profile>("/api/profile", { method: "PUT", body: JSON.stringify(profile) }),
```

to:

```ts
  // Profile
  getProfile: () => request<Profile>("/api/profile"),
  updateProfile: (profile: Profile) =>
    request<Profile>("/api/profile", { method: "PUT", body: JSON.stringify(profile) }),
  // Permanently deletes the signed-in user's entire account. The caller is
  // responsible for following a successful call with a real logout
  // navigation -- this does not touch the session cookie (see Profile.tsx).
  deleteProfile: () => request<void>("/api/profile", { method: "DELETE" }),
```

- [ ] **Step 2: Add the Danger zone section to `Profile.tsx`**

Change the import line:

```tsx
import { api } from "../api/client";
```

to:

```tsx
import { api, BASE_URL } from "../api/client";
```

Add these three state variables inside `Profile`, right after the existing `saveTimeoutRef` declaration:

```tsx
  const [deleteConfirmOpen, setDeleteConfirmOpen] = useState(false);
  const [deleteConfirmText, setDeleteConfirmText] = useState("");
  const [deleting, setDeleting] = useState(false);
```

Add this function right after `flushPendingSave`:

```tsx
  async function deleteAccount() {
    setDeleting(true);
    setError(null);
    try {
      await api.deleteProfile();
      // Deletion doesn't clear the session cookie -- follow with a real
      // logout navigation (must be a POST, same as the header's Log out
      // button in App.tsx) so Keycloak's own SSO session ends too, not just
      // geniusrun's local one.
      const form = document.createElement("form");
      form.method = "post";
      form.action = `${BASE_URL}/api/session/logout`;
      document.body.appendChild(form);
      form.submit();
    } catch (e) {
      setError(String(e));
      setDeleting(false);
    }
  }
```

Add this fieldset right after `<TrainingTypesCard />` (still inside the closing `</div>` of `.profile-page`):

```tsx
      <fieldset className="kind-editor danger-zone">
        <legend>Danger zone</legend>
        {!deleteConfirmOpen ? (
          <button type="button" className="button-danger" onClick={() => setDeleteConfirmOpen(true)}>
            Delete profile
          </button>
        ) : (
          <div className="danger-zone-confirm">
            <p>
              This permanently deletes your account -- Garmin credentials, every custom rule, and every synced
              activity -- and logs you out. This cannot be undone.
            </p>
            <label>
              Type DELETE to confirm
              <input
                type="text"
                value={deleteConfirmText}
                onChange={(e) => setDeleteConfirmText(e.target.value)}
                disabled={deleting}
              />
            </label>
            <div className="controls">
              <button
                type="button"
                disabled={deleting}
                onClick={() => {
                  setDeleteConfirmOpen(false);
                  setDeleteConfirmText("");
                }}
              >
                Cancel
              </button>
              <button
                type="button"
                className="button-danger"
                disabled={deleting || deleteConfirmText !== "DELETE"}
                onClick={deleteAccount}
              >
                Permanently delete
              </button>
            </div>
          </div>
        )}
      </fieldset>
```

- [ ] **Step 3: Add the confirmation block's CSS**

In `frontend/src/App.css`, add right after the `.button-danger:hover:not(:disabled)` rule:

```css
.danger-zone-confirm {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.danger-zone-confirm p {
  margin: 0;
  color: #9aa0ab;
}
```

- [ ] **Step 4: Build and lint**

Run: `cd frontend && npm run build && npm run lint`
Expected: build succeeds; lint reports no new warnings (the 3 pre-existing `PaceField.tsx` `only-export-components` warnings are unrelated and expected to remain).

- [ ] **Step 5: Manual browser verification**

With the backend running (`cd backend && ./start.sh`) and frontend dev server running (`cd frontend && ./start.sh`), in a browser:
1. Log in, go to the Profile page, scroll to "Danger zone".
2. Click "Delete profile" — the confirm block appears; "Permanently delete" is disabled.
3. Type `delete` (lowercase) — button stays disabled. Type `DELETE` — button enables.
4. Click "Cancel" — block collapses, typed text is cleared if reopened.
5. Reopen, type `DELETE`, click "Permanently delete" — expect a full-page navigation ending on the login screen (Keycloak or geniusrun's own login gate, matching what the existing "Log out" button already does).
6. Log back in with the same account — expect the "Create your profile" screen (`CreateProfile.tsx`), confirming the account was actually deleted, not just logged out.

- [ ] **Step 6: Commit**

```bash
git add frontend/src/api/client.ts frontend/src/pages/Profile.tsx frontend/src/App.css
git commit -m "feat(profile): add Danger zone account deletion UI"
```

---

### Task 4: Final verification

**Files:** none (verification only)

- [ ] **Step 1: Full backend check**

Run: `cd backend && gofmt -l . && go vet ./... && go build ./... && go test ./...`
Expected: `gofmt -l .` empty; everything else passes.

- [ ] **Step 2: Full frontend check**

Run: `cd frontend && npm run build && npm run lint`
Expected: both succeed, no new lint warnings.

- [ ] **Step 3: Confirm `docs/DATABASE.md` is current**

Run: `cd backend && go run ./cmd/dumpschema && git status --short docs/DATABASE.md`
Expected: no output from `git status` (already committed in Task 1, and hasn't drifted since).

- [ ] **Step 4: Update `docs/IDEAS.md`**

Remove the now-implemented line from `docs/IDEAS.md`'s Backlog section:

```
- profile deletion: add a way to delete our profile with a dedicated button on the profile page (which by extension will also logout the user, to be consistent with the logic that login will trigger the profile creation)
```

- [ ] **Step 5: Commit**

```bash
git add docs/IDEAS.md
git commit -m "docs: remove profile deletion from IDEAS backlog (implemented)"
```