diff --git a/.cursor/skills/spark-im-v3/SKILL.md b/.cursor/skills/spark-im-v3/SKILL.md
index 5206660..8cddbe3 100644
--- a/.cursor/skills/spark-im-v3/SKILL.md
+++ b/.cursor/skills/spark-im-v3/SKILL.md
@@ -104,7 +104,7 @@ AUTH/login rate-limit uses `reqctx.RealIP`. TaskPool workers recover panics. Del
 - New goroutine I/O does not belong in `OnTraffic`.
 - HTTP: thin handler + module `logic`; REST group by business; validate with i18n `label`/`errmsg` keys; put RealIP and language on context.
 - Closed type/status: entity typed enum + `Valid()` + OpenAPI named `$ref` + validator `oneof` on the same values ([enums.md](enums.md)).
-- Login is email OTP (`POST /v1/auth/login`). `uid` is Snowflake `users.id`; public `spark_id` is unique and mutable. Email↔user lives in `user_emails`. Login upserts `user_devices` (client `device_id`).
+- Login is email OTP (`POST /v1/auth/login`). `uid` is Snowflake `users.id`; public `spark_id` is unique and mutable. Email↔user lives in `user_emails`. Login upserts `user_devices` (client `device_id`). Logout is `POST /v1/auth/logout` (current device). Account cancellation is `DELETE /v1/users/me` (archive to `user_delete`, purge friends/moments/related).
 - SQL tables and GORM models carry COMMENT on the table and every column.
 - After adding or changing `migrations/*.sql`, run `go run ./cmd/migrate -config configs/config.yaml` in this session. Do not leave it for deploy.
 - Run `make lint` (funlen 100).
diff --git a/.cursor/skills/spark-im-v3/http.md b/.cursor/skills/spark-im-v3/http.md
index 92038a6..b9f45ef 100644
--- a/.cursor/skills/spark-im-v3/http.md
+++ b/.cursor/skills/spark-im-v3/http.md
@@ -80,7 +80,7 @@ Public HTTP is `/v1/{resource}/...`. Register with Gin groups in `internal/trans
 |-------|--------|----------|
 | system | `/healthz`, `/readyz`, `/docs` | liveness, readiness, OpenAPI（`/docs` API，`/docs/enums` 枚举，`/docs/errors` 错误码） |
 | auth | `/v1/auth` | `POST /v1/auth/login`, `POST /v1/auth/email-codes`, `POST /v1/auth/token/refresh`, `POST /v1/auth/logout` |
-| users | `/v1/users` | `GET/PATCH /v1/users/me` |
+| users | `/v1/users` | `GET/PATCH/DELETE /v1/users/me` |
 | friends | `/v1/friends` | apply, requests, accept, profile, remark, pin, block, report |
 | groups | `/v1/groups` | create, profile, members, invite, kick, leave, transfer, dissolve |
 | conversations | `/v1/conversations` | list, mute |
diff --git a/.gitignore b/.gitignore
index cdf32ed..c364520 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,4 @@ vendor/
 coverage.out
 .env
 certs/*.key
+server
diff --git a/README.md b/README.md
index 0478681..5e2e564 100644
--- a/README.md
+++ b/README.md
@@ -120,8 +120,8 @@ HTTP 与 TCP **应答 Body** 同一套信封。业务成败只看 `code` 字符
 | 探活 | `/healthz` `/readyz` | 存活；未就绪 HTTP 503 |
 | 文档 | `/docs` `/docs/enums` `/docs/errors` `/openapi.yaml` | 无需登录 |
 | 枚举 | `GET /v1/meta/enums` | 无需登录 |
-| 认证 | `/v1/auth` | 发码、登录、刷新、登出 |
-| 用户 | `/v1/users/me` | 资料 |
+| 认证 | `/v1/auth` | 发码、登录、刷新、登出当前设备 |
+| 用户 | `/v1/users/me` | 资料；`DELETE` 注销（迁入 `user_delete`） |
 | 好友 | `/v1/friends` | 申请、同意、备注、置顶、拉黑、举报 |
 | 群 | `/v1/groups` | 创建、资料、成员、邀请、踢人、转让、解散 |
 | 文件 | `/v1/files` | 上传/下载凭证、批量、图片派生 |
diff --git a/internal/bootstrap/app.go b/internal/bootstrap/app.go
index 94085b5..46731d5 100644
--- a/internal/bootstrap/app.go
+++ b/internal/bootstrap/app.go
@@ -172,6 +172,7 @@ func finishApp(cfg *Config, log *zap.Logger, logClose func() error, idgen *id.Ge
 	files := wireFiles(cfg, objects, groups)
 	favorites := wireFavorites(idgen, db, objects, chat)
 	moments := wireMoments(idgen, db, objects, friends, users)
+	users.BindAccountCleanup(jwtSvc, sessions, accountCleaners(friends, moments, groups, favorites, inbox, mailbox, chat)...)
 	app.tcp = tcp.NewServer(log, pool, sessions, &tcp.Options{
 		Addr:          cfg.Server.TCP.Addr,
 		Multicore:     cfg.Server.TCP.Multicore,
@@ -366,6 +367,45 @@ func wireMessages(idgen *id.Generator, friends *friendlogic.Service, groups *gro
 	return msglogic.NewService(chat.msgs, chat.chats, chat.p2p, friends, groups, idgen, q)
 }
 
+func accountCleaners(
+	friends *friendlogic.Service,
+	moments *momentlogic.Service,
+	groups *grouplogic.Service,
+	favorites *favlogic.Service,
+	inbox inboxlogic.Store,
+	mailbox synclogic.Mailbox,
+	chat chatStores,
+) []userlogic.UserDataCleaner {
+	out := make([]userlogic.UserDataCleaner, 0, 8)
+	if friends != nil {
+		out = append(out, friends)
+	}
+	if moments != nil {
+		out = append(out, moments)
+	}
+	if groups != nil {
+		out = append(out, groups)
+	}
+	if favorites != nil {
+		out = append(out, favorites)
+	}
+	if inbox != nil {
+		out = append(out, userlogic.CleanerFunc(inbox.PurgeUser))
+	}
+	if mailbox != nil {
+		out = append(out, userlogic.CleanerFunc(mailbox.PurgeUser))
+	}
+	if chat.msgs != nil {
+		out = append(out, userlogic.CleanerFunc(chat.msgs.PurgeUser))
+	}
+	if p, ok := chat.chats.(interface {
+		PurgeUser(context.Context, int64) error
+	}); ok {
+		out = append(out, userlogic.CleanerFunc(p.PurgeUser))
+	}
+	return out
+}
+
 func jwtDenylist(rdb *redisx.Client, prefix string) authlogic.Denylist {
 	if rdb != nil && rdb.Ready() {
 		return authlogic.NewRedisDenylist(rdb.RDB(), prefix)
diff --git a/internal/module/auth/logic/jwt.go b/internal/module/auth/logic/jwt.go
index e8fd485..3c3d58c 100644
--- a/internal/module/auth/logic/jwt.go
+++ b/internal/module/auth/logic/jwt.go
@@ -24,6 +24,7 @@ type Issuer interface {
 	Issue(ctx context.Context, userID int64, deviceID uint64) (*authentity.IssuedToken, error)
 	Refresh(ctx context.Context, refreshToken string) (*authentity.IssuedToken, error)
 	Logout(ctx context.Context, userID int64, deviceID uint64, accessJTI string, accessExp time.Time) error
+	LogoutAll(ctx context.Context, userID int64) error
 	Revoke(ctx context.Context, token string) error
 }
 
@@ -231,6 +232,29 @@ func (j *JWT) Logout(ctx context.Context, userID int64, deviceID uint64, accessJ
 	return nil
 }
 
+func (j *JWT) LogoutAll(ctx context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	rows, err := j.pairs.ListByUser(ctx, userID)
+	if err != nil {
+		return errs.ErrAvailable.WithError("jwt-refresh", err)
+	}
+	for i := range rows {
+		row := rows[i]
+		if row.Pair.Access != "" {
+			_ = j.denylist.Add(ctx, row.Pair.Access, j.ttl)
+		}
+		if row.Pair.Refresh != "" {
+			_ = j.denylist.Add(ctx, row.Pair.Refresh, j.refreshTTL)
+		}
+		if err := j.pairs.Delete(ctx, userID, row.DeviceID); err != nil {
+			return errs.ErrAvailable.WithError("jwt-refresh", err)
+		}
+	}
+	return nil
+}
+
 func (j *JWT) Authenticate(ctx context.Context, token string) (*authentity.Principal, error) {
 	c, err := j.parse(token, false)
 	if err != nil {
diff --git a/internal/module/auth/logic/jwt_test.go b/internal/module/auth/logic/jwt_test.go
index e4bf03b..ff8d14d 100644
--- a/internal/module/auth/logic/jwt_test.go
+++ b/internal/module/auth/logic/jwt_test.go
@@ -143,6 +143,31 @@ func TestJWTLogoutRevokesPair(t *testing.T) {
 	}
 }
 
+func TestJWTLogoutAllRevokesEveryDevice(t *testing.T) {
+	ctx := context.Background()
+	j := testJWT(t, nil)
+	first, err := j.Issue(ctx, 8, 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	second, err := j.Issue(ctx, 8, 2)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := j.LogoutAll(ctx, 8); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := j.Authenticate(ctx, first.AccessToken); !errors.Is(err, errs.ErrUnauthorized) {
+		t.Fatalf("first access: %v", err)
+	}
+	if _, err := j.Authenticate(ctx, second.AccessToken); !errors.Is(err, errs.ErrUnauthorized) {
+		t.Fatalf("second access: %v", err)
+	}
+	if _, err := j.Refresh(ctx, first.RefreshToken); !errors.Is(err, errs.ErrUnauthorized) {
+		t.Fatalf("first refresh: %v", err)
+	}
+}
+
 func TestJWTDenylistRevoke(t *testing.T) {
 	ctx := context.Background()
 	j := testJWT(t, nil)
diff --git a/internal/module/auth/logic/refresh.go b/internal/module/auth/logic/refresh.go
index 59751dc..5a90df3 100644
--- a/internal/module/auth/logic/refresh.go
+++ b/internal/module/auth/logic/refresh.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 
@@ -28,6 +29,13 @@ type PairStore interface {
 	Put(ctx context.Context, userID int64, deviceID uint64, pair TokenPair, ttl time.Duration) error
 	Get(ctx context.Context, userID int64, deviceID uint64) (TokenPair, error)
 	Delete(ctx context.Context, userID int64, deviceID uint64) error
+	ListByUser(ctx context.Context, userID int64) ([]DevicePair, error)
+}
+
+// DevicePair is the live token pair for one device of a user.
+type DevicePair struct {
+	DeviceID uint64
+	Pair     TokenPair
 }
 
 type MemoryPairs struct {
@@ -79,6 +87,33 @@ func (s *MemoryPairs) Delete(_ context.Context, userID int64, deviceID uint64) e
 	return nil
 }
 
+func (s *MemoryPairs) ListByUser(_ context.Context, userID int64) ([]DevicePair, error) {
+	if userID <= 0 {
+		return nil, nil
+	}
+	prefix := strconv.FormatInt(userID, 10) + ":"
+	now := time.Now().UnixNano()
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	out := make([]DevicePair, 0)
+	for key := range s.items {
+		row := s.items[key]
+		if !strings.HasPrefix(key, prefix) {
+			continue
+		}
+		if now >= row.exp {
+			delete(s.items, key)
+			continue
+		}
+		did, err := strconv.ParseUint(key[len(prefix):], 10, 64)
+		if err != nil || did == 0 {
+			continue
+		}
+		out = append(out, DevicePair{DeviceID: did, Pair: row.pair})
+	}
+	return out, nil
+}
+
 type RedisPairs struct {
 	rdb    *redis.Client
 	prefix string
@@ -133,3 +168,44 @@ func (s *RedisPairs) Delete(ctx context.Context, userID int64, deviceID uint64)
 	}
 	return s.rdb.Del(ctx, s.key(userID, deviceID)).Err()
 }
+
+func (s *RedisPairs) ListByUser(ctx context.Context, userID int64) ([]DevicePair, error) {
+	if s == nil || s.rdb == nil {
+		return nil, errs.ErrAvailable.WithInnerMsg("jwt refresh redis not ready")
+	}
+	if userID <= 0 {
+		return nil, nil
+	}
+	prefix := s.prefix + strconv.FormatInt(userID, 10) + ":"
+	var cursor uint64
+	out := make([]DevicePair, 0)
+	for {
+		keys, next, err := s.rdb.Scan(ctx, cursor, prefix+"*", 100).Result()
+		if err != nil {
+			return nil, err
+		}
+		for _, key := range keys {
+			did, err := strconv.ParseUint(strings.TrimPrefix(key, prefix), 10, 64)
+			if err != nil || did == 0 {
+				continue
+			}
+			raw, err := s.rdb.Get(ctx, key).Bytes()
+			if err == redis.Nil {
+				continue
+			}
+			if err != nil {
+				return nil, err
+			}
+			var pair TokenPair
+			if err := json.Unmarshal(raw, &pair); err != nil {
+				continue
+			}
+			out = append(out, DevicePair{DeviceID: did, Pair: pair})
+		}
+		cursor = next
+		if cursor == 0 {
+			break
+		}
+	}
+	return out, nil
+}
diff --git a/internal/module/conversation/model/memory.go b/internal/module/conversation/model/memory.go
index 0a6d5c3..5111dfc 100644
--- a/internal/module/conversation/model/memory.go
+++ b/internal/module/conversation/model/memory.go
@@ -125,3 +125,15 @@ func (m *MemoryP2P) UpdateLastMsg(_ context.Context, id, msgID, atMS int64) erro
 	}
 	return nil
 }
+
+func (m *MemoryP2P) PurgeUser(_ context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for _, byUser := range m.members {
+		delete(byUser, userID)
+	}
+	return nil
+}
diff --git a/internal/module/conversation/model/repo.go b/internal/module/conversation/model/repo.go
index 143a5aa..4b968da 100644
--- a/internal/module/conversation/model/repo.go
+++ b/internal/module/conversation/model/repo.go
@@ -121,6 +121,17 @@ func (m *Repo) UpdateLastMsg(ctx context.Context, id, msgID, atMS int64) error {
 	return nil
 }
 
+func (m *Repo) PurgeUser(ctx context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return err
+	}
+	return mapDBErr(db.Where("user_id = ?", userID).Delete(&ConversationMember{}).Error)
+}
+
 func (r *Conversation) entity() *entity.Conversation {
 	if r == nil {
 		return nil
diff --git a/internal/module/favorite/logic/purge.go b/internal/module/favorite/logic/purge.go
new file mode 100644
index 0000000..b001493
--- /dev/null
+++ b/internal/module/favorite/logic/purge.go
@@ -0,0 +1,28 @@
+package logic
+
+import (
+	"context"
+	"errors"
+
+	"spark-server/internal/pkg/errs"
+)
+
+func (s *Service) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || s.repo == nil || userID <= 0 {
+		return nil
+	}
+	rows, err := s.repo.ListAllByUser(ctx, userID)
+	if err != nil {
+		return err
+	}
+	for _, row := range rows {
+		if row == nil {
+			continue
+		}
+		if err := s.repo.Delete(ctx, userID, row.ID); err != nil && !errors.Is(err, errs.ErrNotFound) {
+			return err
+		}
+		s.deleteFavoriteMedia(ctx, row.Content)
+	}
+	return nil
+}
diff --git a/internal/module/favorite/logic/service.go b/internal/module/favorite/logic/service.go
index 8b81f0a..94272b3 100644
--- a/internal/module/favorite/logic/service.go
+++ b/internal/module/favorite/logic/service.go
@@ -15,6 +15,7 @@ type Repository interface {
 	Create(ctx context.Context, fav *entity.Favorite) error
 	ListByUser(ctx context.Context, userID int64, limit int) ([]*entity.Favorite, error)
 	Delete(ctx context.Context, userID, id int64) error
+	ListAllByUser(ctx context.Context, userID int64) ([]*entity.Favorite, error)
 }
 
 type Messages interface {
diff --git a/internal/module/favorite/model/memory.go b/internal/module/favorite/model/memory.go
index 6c76f46..a739ef0 100644
--- a/internal/module/favorite/model/memory.go
+++ b/internal/module/favorite/model/memory.go
@@ -80,6 +80,19 @@ func (m *MemoryRepo) ListByUser(_ context.Context, userID int64, limit int) ([]*
 	return out, nil
 }
 
+func (m *MemoryRepo) ListAllByUser(_ context.Context, userID int64) ([]*entity.Favorite, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]*entity.Favorite, 0)
+	for _, row := range m.byID {
+		if row.UserID == userID {
+			out = append(out, cloneFav(row))
+		}
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].ID > out[j].ID })
+	return out, nil
+}
+
 func (m *MemoryRepo) Delete(_ context.Context, userID, id int64) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()
diff --git a/internal/module/favorite/model/repo.go b/internal/module/favorite/model/repo.go
index a3a9585..8557cc0 100644
--- a/internal/module/favorite/model/repo.go
+++ b/internal/module/favorite/model/repo.go
@@ -98,6 +98,22 @@ func (m *Repo) ListByUser(ctx context.Context, userID int64, limit int) ([]*enti
 	return out, nil
 }
 
+func (m *Repo) ListAllByUser(ctx context.Context, userID int64) ([]*entity.Favorite, error) {
+	db, err := m.session(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var rows []Favorite
+	if err := db.Where("user_id = ?", userID).Order("id DESC").Limit(10000).Find(&rows).Error; err != nil {
+		return nil, mapDBErr(err)
+	}
+	out := make([]*entity.Favorite, 0, len(rows))
+	for i := range rows {
+		out = append(out, rows[i].Entity())
+	}
+	return out, nil
+}
+
 func (m *Repo) Delete(ctx context.Context, userID, id int64) error {
 	db, err := m.session(ctx)
 	if err != nil {
diff --git a/internal/module/friend/logic/purge.go b/internal/module/friend/logic/purge.go
new file mode 100644
index 0000000..ce556ef
--- /dev/null
+++ b/internal/module/friend/logic/purge.go
@@ -0,0 +1,10 @@
+package logic
+
+import "context"
+
+func (s *Service) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || s.repo == nil || userID <= 0 {
+		return nil
+	}
+	return s.repo.PurgeUser(ctx, userID)
+}
diff --git a/internal/module/friend/logic/service.go b/internal/module/friend/logic/service.go
index 2e1c3f1..45da92c 100644
--- a/internal/module/friend/logic/service.go
+++ b/internal/module/friend/logic/service.go
@@ -26,6 +26,7 @@ type Repository interface {
 	CreateReport(ctx context.Context, r *entity.Report) error
 	AcceptFriend(ctx context.Context, in entity.AcceptParams) error
 	DeleteFriend(ctx context.Context, a, b int64) error
+	PurgeUser(ctx context.Context, userID int64) error
 }
 
 // UserFinder resolves accounts by uid / email / spark_id / qrcode ticket.
diff --git a/internal/module/friend/model/purge.go b/internal/module/friend/model/purge.go
new file mode 100644
index 0000000..93c31d3
--- /dev/null
+++ b/internal/module/friend/model/purge.go
@@ -0,0 +1,55 @@
+package model
+
+import (
+	"context"
+
+	"spark-server/internal/pkg/errs"
+)
+
+func (m *Repo) PurgeUser(ctx context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return err
+	}
+	if err := db.Where("user_id = ? OR friend_id = ?", userID, userID).Delete(&FriendRelation{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := db.Where("from_user = ? OR to_user = ?", userID, userID).Delete(&FriendRequest{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := db.Where("user_id = ? OR target_id = ?", userID, userID).Delete(&FriendReport{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	return nil
+}
+
+func (m *MemoryRepo) PurgeUser(_ context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key := range m.relations {
+		if key.UserID == userID || key.FriendID == userID {
+			delete(m.relations, key)
+		}
+	}
+	for id, req := range m.requests {
+		if req == nil || (req.FromUser != userID && req.ToUser != userID) {
+			continue
+		}
+		delete(m.requests, id)
+		delete(m.byPair, requestKey{From: req.FromUser, To: req.ToUser})
+	}
+	kept := m.reports[:0]
+	for _, r := range m.reports {
+		if r != nil && r.UserID != userID && r.TargetID != userID {
+			kept = append(kept, r)
+		}
+	}
+	m.reports = kept
+	return nil
+}
diff --git a/internal/module/group/logic/group_test.go b/internal/module/group/logic/group_test.go
index 6282a1e..366d17a 100644
--- a/internal/module/group/logic/group_test.go
+++ b/internal/module/group/logic/group_test.go
@@ -355,3 +355,79 @@ func TestGroupAdminAnnouncementRemarkMentions(t *testing.T) {
 		t.Fatalf("at outsider %v", err)
 	}
 }
+
+func TestPurgeUserTransfersOwnerToAdmin(t *testing.T) {
+	svc, friends, users := testGroups(t)
+	ctx := t.Context()
+	a := login(t, users, "test01@spark.com", 1)
+	b := login(t, users, "test02@spark.com", 2)
+	c := login(t, users, "test03@spark.com", 3)
+	becomeFriends(t, friends, a, b)
+	becomeFriends(t, friends, a, c)
+	g, err := svc.Create(ctx, a.ID, &CreateInput{Name: "局", MemberUIDs: []int64{c.ID, b.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	admin := entity.RoleAdmin
+	if _, err := svc.UpdateMember(ctx, a.ID, g.ID, b.ID, &UpdateMemberInput{Role: &admin}); err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.PurgeUser(ctx, a.ID); err != nil {
+		t.Fatal(err)
+	}
+	got, err := svc.Get(ctx, b.ID, g.ID)
+	if err != nil || got.OwnerID != b.ID || got.Role != entity.RoleOwner {
+		t.Fatalf("successor %+v %v", got, err)
+	}
+	if _, err := svc.Get(ctx, a.ID, g.ID); !errors.Is(err, errs.ErrForbidden) {
+		t.Fatalf("owner still member %v", err)
+	}
+	if _, err := svc.Get(ctx, c.ID, g.ID); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestPurgeUserTransfersOwnerToFirstMember(t *testing.T) {
+	svc, friends, users := testGroups(t)
+	ctx := t.Context()
+	a := login(t, users, "test01@spark.com", 1)
+	b := login(t, users, "test02@spark.com", 2)
+	c := login(t, users, "test03@spark.com", 3)
+	becomeFriends(t, friends, a, b)
+	becomeFriends(t, friends, a, c)
+	g, err := svc.Create(ctx, a.ID, &CreateInput{Name: "局", MemberUIDs: []int64{b.ID, c.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.PurgeUser(ctx, a.ID); err != nil {
+		t.Fatal(err)
+	}
+	got, err := svc.Get(ctx, b.ID, g.ID)
+	if err != nil || got.OwnerID != b.ID {
+		t.Fatalf("first member %+v %v", got, err)
+	}
+	if _, err := svc.Get(ctx, a.ID, g.ID); !errors.Is(err, errs.ErrForbidden) {
+		t.Fatalf("owner still member %v", err)
+	}
+}
+
+func TestPurgeUserDissolvesWhenOwnerAlone(t *testing.T) {
+	svc, friends, users := testGroups(t)
+	ctx := t.Context()
+	a := login(t, users, "test01@spark.com", 1)
+	b := login(t, users, "test02@spark.com", 2)
+	becomeFriends(t, friends, a, b)
+	g, err := svc.Create(ctx, a.ID, &CreateInput{Name: "局", MemberUIDs: []int64{b.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.RemoveMember(ctx, a.ID, g.ID, b.ID); err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.PurgeUser(ctx, a.ID); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := svc.Get(ctx, a.ID, g.ID); !errors.Is(err, errs.ErrNotFound) {
+		t.Fatalf("solo owner group %v", err)
+	}
+}
diff --git a/internal/module/group/logic/purge.go b/internal/module/group/logic/purge.go
new file mode 100644
index 0000000..a5afd6e
--- /dev/null
+++ b/internal/module/group/logic/purge.go
@@ -0,0 +1,73 @@
+package logic
+
+import (
+	"context"
+	"errors"
+
+	"spark-server/internal/module/group/entity"
+	"spark-server/internal/pkg/errs"
+)
+
+func (s *Service) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || s.repo == nil || userID <= 0 {
+		return nil
+	}
+	groups, err := s.repo.ListAllActiveByUser(ctx, userID)
+	if err != nil {
+		return err
+	}
+	for _, g := range groups {
+		if g == nil {
+			continue
+		}
+		if g.OwnerID == userID {
+			if err := s.handOffOwnedGroup(ctx, userID, g); err != nil {
+				return err
+			}
+			continue
+		}
+		if err := s.repo.RemoveMember(ctx, g.ID, userID); err != nil && !errors.Is(err, errs.ErrNotFound) {
+			return err
+		}
+		s.invalidateMembers(g.ConversationID)
+	}
+	return nil
+}
+
+func (s *Service) handOffOwnedGroup(ctx context.Context, ownerID int64, g *entity.Group) error {
+	members, err := s.repo.ListMembers(ctx, g.ID, entity.MemberListMax)
+	if err != nil {
+		return err
+	}
+	next := successorOwnerID(ownerID, members)
+	if next == 0 {
+		err := s.Dissolve(ctx, ownerID, g.ID)
+		if err != nil && !errors.Is(err, errs.ErrNotFound) {
+			return err
+		}
+		return nil
+	}
+	if _, err := s.Transfer(ctx, ownerID, g.ID, &TransferInput{UID: next}); err != nil {
+		return err
+	}
+	if err := s.RemoveMember(ctx, ownerID, g.ID, ownerID); err != nil && !errors.Is(err, errs.ErrNotFound) {
+		return err
+	}
+	return nil
+}
+
+func successorOwnerID(ownerID int64, members []*entity.Member) int64 {
+	var firstOther int64
+	for _, m := range members {
+		if m == nil || m.UserID == ownerID {
+			continue
+		}
+		if m.Role == entity.RoleAdmin {
+			return m.UserID
+		}
+		if firstOther == 0 {
+			firstOther = m.UserID
+		}
+	}
+	return firstOther
+}
diff --git a/internal/module/group/logic/service.go b/internal/module/group/logic/service.go
index 97da5b1..e1c7f63 100644
--- a/internal/module/group/logic/service.go
+++ b/internal/module/group/logic/service.go
@@ -21,6 +21,7 @@ type Repository interface {
 	Get(ctx context.Context, id int64) (*entity.Group, error)
 	GetByConversation(ctx context.Context, conversationID int64) (*entity.Group, error)
 	ListByUser(ctx context.Context, userID int64, limit int) ([]*entity.Group, error)
+	ListAllActiveByUser(ctx context.Context, userID int64) ([]*entity.Group, error)
 	UpdateProfile(ctx context.Context, g *entity.Group) error
 	GetMember(ctx context.Context, groupID, userID int64) (*entity.Member, error)
 	ListMembers(ctx context.Context, groupID int64, limit int) ([]*entity.Member, error)
diff --git a/internal/module/group/model/group.go b/internal/module/group/model/group.go
index 4ffc737..e58ded1 100644
--- a/internal/module/group/model/group.go
+++ b/internal/module/group/model/group.go
@@ -112,6 +112,31 @@ func (m *Repo) ListByUser(ctx context.Context, userID int64, limit int) ([]*enti
 	return out, nil
 }
 
+const purgeListCap = 10000
+
+func (m *Repo) ListAllActiveByUser(ctx context.Context, userID int64) ([]*entity.Group, error) {
+	if userID <= 0 {
+		return nil, errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var rows []Group
+	err = db.Table("groups AS g").Select("g.*").
+		Joins("INNER JOIN group_members m ON m.group_id = g.id").
+		Where("m.user_id = ? AND g.status = ?", userID, entity.StatusActive).
+		Order("g.updated_at DESC").Limit(purgeListCap).Find(&rows).Error
+	if err != nil {
+		return nil, mapDBErr(err)
+	}
+	out := make([]*entity.Group, 0, len(rows))
+	for i := range rows {
+		out = append(out, rows[i].entity())
+	}
+	return out, nil
+}
+
 func (m *Repo) UpdateProfile(ctx context.Context, g *entity.Group) error {
 	if g == nil || g.ID <= 0 {
 		return errs.ErrInvalidArgument
diff --git a/internal/module/group/model/group_member.go b/internal/module/group/model/group_member.go
index 9141120..696ad9b 100644
--- a/internal/module/group/model/group_member.go
+++ b/internal/module/group/model/group_member.go
@@ -73,7 +73,7 @@ func (m *Repo) ListMembers(ctx context.Context, groupID int64, limit int) ([]*en
 	}
 	limit = entity.ClampMemberLimit(limit)
 	var rows []GroupMember
-	err = db.Where("group_id = ?", groupID).Order("role ASC, joined_at ASC").Limit(limit).Find(&rows).Error
+	err = db.Where("group_id = ?", groupID).Order("role ASC, joined_at ASC, id ASC").Limit(limit).Find(&rows).Error
 	if err != nil {
 		return nil, mapDBErr(err)
 	}
diff --git a/internal/module/group/model/memory.go b/internal/module/group/model/memory.go
index d1fe7f2..ae1b603 100644
--- a/internal/module/group/model/memory.go
+++ b/internal/module/group/model/memory.go
@@ -73,6 +73,25 @@ func (m *MemoryRepo) ListByUser(_ context.Context, userID int64, limit int) ([]*
 	return out, nil
 }
 
+func (m *MemoryRepo) ListAllActiveByUser(_ context.Context, userID int64) ([]*entity.Group, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]*entity.Group, 0)
+	for gid, byUser := range m.members {
+		if _, ok := byUser[userID]; !ok {
+			continue
+		}
+		g, ok := m.groups[gid]
+		if !ok || g.Status != entity.StatusActive {
+			continue
+		}
+		cp := *g
+		out = append(out, &cp)
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].UpdatedAtMS > out[j].UpdatedAtMS })
+	return out, nil
+}
+
 func (m *MemoryRepo) GetMember(_ context.Context, groupID, userID int64) (*entity.Member, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
@@ -105,7 +124,10 @@ func (m *MemoryRepo) ListMembers(_ context.Context, groupID int64, limit int) ([
 		if out[i].Role != out[j].Role {
 			return out[i].Role < out[j].Role
 		}
-		return out[i].JoinedAtMS < out[j].JoinedAtMS
+		if out[i].JoinedAtMS != out[j].JoinedAtMS {
+			return out[i].JoinedAtMS < out[j].JoinedAtMS
+		}
+		return out[i].UserID < out[j].UserID
 	})
 	if len(out) > limit {
 		out = out[:limit]
diff --git a/internal/module/inbox/logic/store.go b/internal/module/inbox/logic/store.go
index 3a3e1b2..4a6c74f 100644
--- a/internal/module/inbox/logic/store.go
+++ b/internal/module/inbox/logic/store.go
@@ -14,4 +14,5 @@ type Store interface {
 	SetPreview(ctx context.Context, conversationID int64, preview []byte) error
 	ListUpdatedSince(ctx context.Context, userID, score int64, limit int) ([]entity.DialogHit, error)
 	LoadDialogs(ctx context.Context, userID int64, hits []entity.DialogHit) ([]entity.Dialog, error)
+	PurgeUser(ctx context.Context, userID int64) error
 }
diff --git a/internal/module/inbox/model/memory.go b/internal/module/inbox/model/memory.go
index 5ee2830..45d9e2f 100644
--- a/internal/module/inbox/model/memory.go
+++ b/internal/module/inbox/model/memory.go
@@ -109,6 +109,16 @@ func (s *MemoryStore) LoadDialogs(_ context.Context, userID int64, hits []entity
 	return out, nil
 }
 
+func (s *MemoryStore) PurgeUser(_ context.Context, userID int64) error {
+	if userID <= 0 {
+		return nil
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	delete(s.byUser, userID)
+	return nil
+}
+
 func (s *MemoryStore) Preview(conversationID int64) []byte {
 	s.mu.Lock()
 	defer s.mu.Unlock()
diff --git a/internal/module/inbox/model/redis.go b/internal/module/inbox/model/redis.go
index 0feb253..5540dfd 100644
--- a/internal/module/inbox/model/redis.go
+++ b/internal/module/inbox/model/redis.go
@@ -128,3 +128,10 @@ func (s *RedisStore) LoadDialogs(ctx context.Context, userID int64, hits []entit
 	}
 	return out, nil
 }
+
+func (s *RedisStore) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || s.rdb == nil || userID <= 0 {
+		return nil
+	}
+	return s.rdb.Del(ctx, unreadKey(userID), readKey(userID), countKey(userID)).Err()
+}
diff --git a/internal/module/message/logic/service.go b/internal/module/message/logic/service.go
index c4008e2..2c67ac4 100644
--- a/internal/module/message/logic/service.go
+++ b/internal/module/message/logic/service.go
@@ -23,6 +23,7 @@ type Repository interface {
 	ListByConversation(ctx context.Context, conversationID, viewerID, lastMsgID int64, limit int) ([]*entity.Message, error)
 	Recall(ctx context.Context, id int64) error
 	HideForUser(ctx context.Context, userID int64, msg *entity.Message) error
+	PurgeUser(ctx context.Context, userID int64) error
 }
 
 type Conversations interface {
diff --git a/internal/module/message/model/memory.go b/internal/module/message/model/memory.go
index b323646..256d682 100644
--- a/internal/module/message/model/memory.go
+++ b/internal/module/message/model/memory.go
@@ -135,6 +135,20 @@ func (m *MemoryRepo) HideForUser(_ context.Context, userID int64, msg *entity.Me
 	return nil
 }
 
+func (m *MemoryRepo) PurgeUser(_ context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for key := range m.hidden {
+		if key.UserID == userID {
+			delete(m.hidden, key)
+		}
+	}
+	return nil
+}
+
 func (m *MemoryRepo) All() []*entity.Message {
 	m.mu.Lock()
 	defer m.mu.Unlock()
diff --git a/internal/module/message/model/query.go b/internal/module/message/model/query.go
index b37f38c..f57e409 100644
--- a/internal/module/message/model/query.go
+++ b/internal/module/message/model/query.go
@@ -110,3 +110,14 @@ func (m *Repo) HideForUser(ctx context.Context, userID int64, msg *entity.Messag
 	}
 	return nil
 }
+
+func (m *Repo) PurgeUser(ctx context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return err
+	}
+	return mapDBErr(db.Where("user_id = ?", userID).Delete(&MessageDelete{}).Error)
+}
diff --git a/internal/module/moment/logic/purge.go b/internal/module/moment/logic/purge.go
new file mode 100644
index 0000000..e9ca1a0
--- /dev/null
+++ b/internal/module/moment/logic/purge.go
@@ -0,0 +1,31 @@
+package logic
+
+import (
+	"context"
+
+	"spark-server/internal/module/moment/entity"
+)
+
+func (s *Service) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || s.repo == nil || userID <= 0 {
+		return nil
+	}
+	posts, err := s.repo.ListAllByAuthor(ctx, userID)
+	if err != nil {
+		return err
+	}
+	st, err := s.repo.GetSettings(ctx, userID)
+	if err != nil {
+		return err
+	}
+	if err := s.repo.PurgeUser(ctx, userID); err != nil {
+		return err
+	}
+	for _, post := range posts {
+		s.deleteMedia(ctx, post)
+	}
+	if s.objects != nil && st != nil && st.CoverKey != "" && entity.ValidCoverKey(st.CoverKey) {
+		_ = s.objects.Delete(ctx, st.CoverKey)
+	}
+	return nil
+}
diff --git a/internal/module/moment/logic/service.go b/internal/module/moment/logic/service.go
index 1453d80..f30637b 100644
--- a/internal/module/moment/logic/service.go
+++ b/internal/module/moment/logic/service.go
@@ -35,6 +35,8 @@ type Repository interface {
 	HideMeFromIDs(ctx context.Context, viewerID int64) ([]int64, error)
 	UpsertHide(ctx context.Context, h *entity.Hide) error
 	DeleteHide(ctx context.Context, userID, peerID int64) error
+	ListAllByAuthor(ctx context.Context, authorID int64) ([]*entity.Post, error)
+	PurgeUser(ctx context.Context, userID int64) error
 }
 
 // Friends is the friend graph used for visibility. Friend module implements it.
diff --git a/internal/module/moment/model/memory_purge.go b/internal/module/moment/model/memory_purge.go
new file mode 100644
index 0000000..af992ec
--- /dev/null
+++ b/internal/module/moment/model/memory_purge.go
@@ -0,0 +1,92 @@
+package model
+
+import (
+	"context"
+
+	"spark-server/internal/module/moment/entity"
+	"spark-server/internal/pkg/errs"
+)
+
+func (m *MemoryRepo) ListAllByAuthor(_ context.Context, authorID int64) ([]*entity.Post, error) {
+	if authorID <= 0 {
+		return nil, errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	out := make([]*entity.Post, 0)
+	for _, row := range m.posts {
+		if row.UserID == authorID {
+			out = append(out, clonePost(row))
+		}
+	}
+	return out, nil
+}
+
+func (m *MemoryRepo) PurgeUser(_ context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	owned := map[int64]bool{}
+	for id, post := range m.posts {
+		if post.UserID == userID {
+			owned[id] = true
+		}
+	}
+	for _, like := range m.likes {
+		if like.UserID != userID || owned[like.PostID] {
+			continue
+		}
+		if post, ok := m.posts[like.PostID]; ok && post.LikeCount > 0 {
+			post.LikeCount--
+		}
+	}
+	for _, c := range m.comments {
+		if c.UserID != userID || owned[c.PostID] || c.Status == entity.StatusDeleted {
+			continue
+		}
+		if post, ok := m.posts[c.PostID]; ok && post.CommentCount > 0 {
+			post.CommentCount--
+		}
+	}
+	for key, like := range m.likes {
+		if like.UserID == userID || owned[like.PostID] {
+			delete(m.likes, key)
+		}
+	}
+	for id, c := range m.comments {
+		if c.UserID == userID || owned[c.PostID] {
+			delete(m.comments, id)
+		}
+	}
+	for id, n := range m.notices {
+		if n.ToUserID == userID || n.FromUserID == userID || owned[n.PostID] {
+			delete(m.notices, id)
+		}
+	}
+	for key, h := range m.hides {
+		if h.UserID == userID || h.PeerID == userID {
+			delete(m.hides, key)
+		}
+	}
+	for postID, peers := range m.audience {
+		if owned[postID] {
+			delete(m.audience, postID)
+			continue
+		}
+		kept := peers[:0]
+		for _, peer := range peers {
+			if peer != userID {
+				kept = append(kept, peer)
+			}
+		}
+		m.audience[postID] = kept
+	}
+	delete(m.settings, userID)
+	for id := range owned {
+		delete(m.posts, id)
+		delete(m.audience, id)
+	}
+	return nil
+}
diff --git a/internal/module/moment/model/purge.go b/internal/module/moment/model/purge.go
new file mode 100644
index 0000000..0e73b8b
--- /dev/null
+++ b/internal/module/moment/model/purge.go
@@ -0,0 +1,105 @@
+package model
+
+import (
+	"context"
+
+	"gorm.io/gorm"
+
+	"spark-server/internal/module/moment/entity"
+	"spark-server/internal/pkg/errs"
+)
+
+func (m *Repo) ListAllByAuthor(ctx context.Context, authorID int64) ([]*entity.Post, error) {
+	if authorID <= 0 {
+		return nil, errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var rows []Post
+	if err := db.Where("user_id = ?", authorID).Find(&rows).Error; err != nil {
+		return nil, mapDBErr(err)
+	}
+	return collectPosts(rows), nil
+}
+
+func (m *Repo) PurgeUser(ctx context.Context, userID int64) error {
+	if userID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return err
+	}
+	return db.Transaction(func(tx *gorm.DB) error {
+		return purgeMomentUser(tx, userID)
+	})
+}
+
+func purgeMomentUser(tx *gorm.DB, userID int64) error {
+	if err := bumpOffUserLikes(tx, userID); err != nil {
+		return err
+	}
+	if err := bumpOffUserComments(tx, userID); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("user_id = ?", userID).Delete(&Like{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("user_id = ?", userID).Delete(&Comment{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("to_user_id = ? OR from_user_id = ?", userID, userID).Delete(&Notice{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("user_id = ? OR peer_id = ?", userID, userID).Delete(&Hide{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("peer_id = ?", userID).Delete(&Audience{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("user_id = ?", userID).Delete(&Setting{}).Error); err != nil {
+		return err
+	}
+	return deleteAuthoredPosts(tx, userID)
+}
+
+func bumpOffUserLikes(tx *gorm.DB, userID int64) error {
+	sql := `UPDATE moment_posts p
+INNER JOIN (SELECT post_id, COUNT(*) AS n FROM moment_likes WHERE user_id = ? GROUP BY post_id) x ON p.id = x.post_id
+SET p.like_count = CASE WHEN p.like_count < x.n THEN 0 ELSE p.like_count - x.n END
+WHERE p.user_id <> ?`
+	return mapDBErr(tx.Exec(sql, userID, userID).Error)
+}
+
+func bumpOffUserComments(tx *gorm.DB, userID int64) error {
+	sql := `UPDATE moment_posts p
+INNER JOIN (SELECT post_id, COUNT(*) AS n FROM moment_comments WHERE user_id = ? AND status = ? GROUP BY post_id) x ON p.id = x.post_id
+SET p.comment_count = CASE WHEN p.comment_count < x.n THEN 0 ELSE p.comment_count - x.n END
+WHERE p.user_id <> ?`
+	return mapDBErr(tx.Exec(sql, userID, entity.StatusNormal, userID).Error)
+}
+
+func deleteAuthoredPosts(tx *gorm.DB, userID int64) error {
+	var ids []int64
+	if err := tx.Model(&Post{}).Where("user_id = ?", userID).Pluck("id", &ids).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if len(ids) == 0 {
+		return nil
+	}
+	if err := mapDBErr(tx.Where("post_id IN ?", ids).Delete(&Audience{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("post_id IN ?", ids).Delete(&Like{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("post_id IN ?", ids).Delete(&Comment{}).Error); err != nil {
+		return err
+	}
+	if err := mapDBErr(tx.Where("post_id IN ?", ids).Delete(&Notice{}).Error); err != nil {
+		return err
+	}
+	return mapDBErr(tx.Where("id IN ?", ids).Delete(&Post{}).Error)
+}
diff --git a/internal/module/sync/logic/service.go b/internal/module/sync/logic/service.go
index 7cb7d7d..ff780fa 100644
--- a/internal/module/sync/logic/service.go
+++ b/internal/module/sync/logic/service.go
@@ -16,6 +16,7 @@ type Mailbox interface {
 	Put(ctx context.Context, userID int64, eventType entity.EventType, conversationID int64, payload []byte) error
 	ListSince(ctx context.Context, userID int64, deviceID uint64, seq int64, limit int) ([]*entity.MailboxItem, error)
 	SaveCursor(ctx context.Context, userID int64, deviceID uint64, mailboxSeq, dialogScore int64) error
+	PurgeUser(ctx context.Context, userID int64) error
 }
 
 type InboxResponse struct {
diff --git a/internal/module/sync/model/memory.go b/internal/module/sync/model/memory.go
index 578040b..5e55e7e 100644
--- a/internal/module/sync/model/memory.go
+++ b/internal/module/sync/model/memory.go
@@ -94,3 +94,25 @@ func (s *MemoryStore) SaveCursor(_ context.Context, userID int64, deviceID uint6
 	s.cursors[[2]int64{userID, int64(deviceID)}] = memCursor{MailboxSeq: mailboxSeq, DialogScore: dialogScore}
 	return nil
 }
+
+func (s *MemoryStore) PurgeUser(_ context.Context, userID int64) error {
+	if s == nil || userID <= 0 {
+		return nil
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	delete(s.seq, userID)
+	kept := s.events[:0]
+	for i := range s.events {
+		if s.events[i].UserID != userID {
+			kept = append(kept, s.events[i])
+		}
+	}
+	s.events = kept
+	for key := range s.cursors {
+		if key[0] == userID {
+			delete(s.cursors, key)
+		}
+	}
+	return nil
+}
diff --git a/internal/module/sync/model/store.go b/internal/module/sync/model/store.go
index 55b33de..123fcdd 100644
--- a/internal/module/sync/model/store.go
+++ b/internal/module/sync/model/store.go
@@ -125,3 +125,17 @@ func (s *Store) SaveCursor(ctx context.Context, userID int64, deviceID uint64, m
 		DoUpdates: clause.AssignmentColumns([]string{"mailbox_seq", "dialog_score", "updated_at"}),
 	}).Create(&row).Error)
 }
+
+func (s *Store) PurgeUser(ctx context.Context, userID int64) error {
+	if s == nil || userID <= 0 {
+		return nil
+	}
+	db, err := s.session(ctx)
+	if err != nil {
+		return err
+	}
+	if err := db.Where("user_id = ?", userID).Delete(&MailboxEvent{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	return mapDBErr(db.Where("user_id = ?", userID).Delete(&DeviceSyncCursor{}).Error)
+}
diff --git a/internal/module/user/entity/deleted.go b/internal/module/user/entity/deleted.go
new file mode 100644
index 0000000..9f59264
--- /dev/null
+++ b/internal/module/user/entity/deleted.go
@@ -0,0 +1,34 @@
+package entity
+
+import "time"
+
+// Deleted is a snapshot of a canceled account, persisted in user_delete.
+type Deleted struct {
+	ID           int64
+	SparkID      string
+	Nickname     string
+	Avatar       string
+	QRCode       string
+	Birthday     time.Time
+	Gender       Gender
+	Status       Status
+	Email        string
+	LastLoginAt  time.Time
+	LastActiveAt time.Time
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
+	DeletedAt    time.Time
+}
+
+// SnapshotDeleted copies a live account into an archive row.
+func SnapshotDeleted(u *User, email string, at time.Time) *Deleted {
+	if u == nil {
+		return nil
+	}
+	return &Deleted{
+		ID: u.ID, SparkID: u.SparkID, Nickname: u.Nickname, Avatar: u.Avatar, QRCode: u.QRCode,
+		Birthday: u.Birthday, Gender: u.Gender, Status: u.Status, Email: email,
+		LastLoginAt: u.LastLoginAt, LastActiveAt: u.LastActiveAt,
+		CreatedAt: u.CreatedAt, UpdatedAt: u.UpdatedAt, DeletedAt: at,
+	}
+}
diff --git a/internal/module/user/logic/delete.go b/internal/module/user/logic/delete.go
new file mode 100644
index 0000000..67bf190
--- /dev/null
+++ b/internal/module/user/logic/delete.go
@@ -0,0 +1,124 @@
+package logic
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"time"
+
+	"spark-server/internal/module/user/entity"
+	"spark-server/internal/pkg/errs"
+)
+
+// UserDataCleaner removes a canceled user's rows in another module.
+type UserDataCleaner interface {
+	PurgeUser(ctx context.Context, userID int64) error
+}
+
+// TokenRevoker drops every live JWT pair for a user. Auth JWT implements it.
+type TokenRevoker interface {
+	LogoutAll(ctx context.Context, userID int64) error
+}
+
+// SessionDropper kicks every TCP connection for a user.
+type SessionDropper interface {
+	KickUser(userID int64)
+}
+
+type cleanerFunc func(context.Context, int64) error
+
+func (f cleanerFunc) PurgeUser(ctx context.Context, userID int64) error {
+	if f == nil {
+		return nil
+	}
+	return f(ctx, userID)
+}
+
+// CleanerFunc adapts a function to UserDataCleaner.
+func CleanerFunc(fn func(context.Context, int64) error) UserDataCleaner {
+	return cleanerFunc(fn)
+}
+
+// BindAccountCleanup wires token revoke, TCP kick, and cross-module purge for 注销.
+func (s *Service) BindAccountCleanup(tokens TokenRevoker, sessions SessionDropper, cleaners ...UserDataCleaner) {
+	if s == nil {
+		return
+	}
+	s.tokens = tokens
+	s.sessions = sessions
+	s.cleaners = append(s.cleaners[:0], cleaners...)
+}
+
+func (s *Service) DeleteAccount(ctx context.Context, userID int64) error {
+	if !s.ready() || userID <= 0 {
+		return errs.ErrUnauthorized
+	}
+	u, err := s.repo.GetByID(ctx, userID)
+	if err != nil {
+		return err
+	}
+	email, err := s.lookupEmail(ctx, userID)
+	if err != nil {
+		return err
+	}
+	s.revokeAccess(ctx, userID)
+	if err := s.purgeRelated(ctx, userID); err != nil {
+		return err
+	}
+	if err := s.repo.ArchiveAndDelete(ctx, entity.SnapshotDeleted(u, email, time.Now())); err != nil {
+		return err
+	}
+	s.deleteAvatarObject(ctx, u.Avatar)
+	if email != "" && s.codes != nil {
+		_ = s.codes.Del(ctx, email)
+	}
+	return nil
+}
+
+func (s *Service) lookupEmail(ctx context.Context, userID int64) (string, error) {
+	email, err := s.repo.GetEmail(ctx, userID)
+	if err == nil {
+		return email, nil
+	}
+	if errors.Is(err, errs.ErrNotFound) {
+		return "", nil
+	}
+	return "", err
+}
+
+func (s *Service) revokeAccess(ctx context.Context, userID int64) {
+	if s.tokens != nil {
+		_ = s.tokens.LogoutAll(ctx, userID)
+	}
+	if s.sessions != nil {
+		s.sessions.KickUser(userID)
+	}
+}
+
+func (s *Service) purgeRelated(ctx context.Context, userID int64) error {
+	for _, c := range s.cleaners {
+		if c == nil {
+			continue
+		}
+		if err := c.PurgeUser(ctx, userID); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+type objectRemover interface {
+	Delete(ctx context.Context, key string) error
+}
+
+func (s *Service) deleteAvatarObject(ctx context.Context, avatar string) {
+	key := strings.TrimSpace(avatar)
+	if !strings.HasPrefix(key, "perm/avatar/") {
+		return
+	}
+	rm, ok := s.objects.(objectRemover)
+	if !ok || rm == nil {
+		return
+	}
+	_ = rm.Delete(ctx, key)
+}
diff --git a/internal/module/user/logic/delete_test.go b/internal/module/user/logic/delete_test.go
new file mode 100644
index 0000000..81b843a
--- /dev/null
+++ b/internal/module/user/logic/delete_test.go
@@ -0,0 +1,95 @@
+package logic
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"spark-server/internal/infrastructure/id"
+	friendlogic "spark-server/internal/module/friend/logic"
+	friendmodel "spark-server/internal/module/friend/model"
+	momentlogic "spark-server/internal/module/moment/logic"
+	momentmodel "spark-server/internal/module/moment/model"
+	"spark-server/internal/module/user/entity"
+	"spark-server/internal/module/user/model"
+	"spark-server/internal/pkg/errs"
+	"spark-server/internal/pkg/reqctx"
+)
+
+func TestDeleteAccountArchivesAndAllowsReregister(t *testing.T) {
+	svc, repo, _ := testService(t)
+	ctx := reqctx.With(t.Context(), &reqctx.RequestContext{RealIP: "203.0.113.10", Language: "zh-CN"})
+	device := &entity.LoginDevice{DeviceID: 7, DeviceType: entity.DeviceIOS}
+	u, err := svc.AuthenticateEmail(ctx, "test01@spark.com", "1", device)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := svc.DeleteAccount(ctx, u.ID); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := repo.GetByID(ctx, u.ID); !errors.Is(err, errs.ErrNotFound) {
+		t.Fatalf("live user %v", err)
+	}
+	if _, err := repo.GetByEmail(ctx, "test01@spark.com"); !errors.Is(err, errs.ErrNotFound) {
+		t.Fatalf("email still bound %v", err)
+	}
+	archived, err := repo.GetDeleted(ctx, u.ID)
+	if err != nil || archived.Email != "test01@spark.com" || archived.SparkID != u.SparkID {
+		t.Fatalf("archive %+v %v", archived, err)
+	}
+	again, err := svc.AuthenticateEmail(ctx, "test01@spark.com", "1", device)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if again.ID == u.ID {
+		t.Fatal("uid reused")
+	}
+}
+
+func TestDeleteAccountPurgesFriendsAndMoments(t *testing.T) {
+	ids, err := id.New(1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	repo := model.NewMemoryRepo()
+	users := NewService(repo, model.NewMemoryCodes(), ids, nil)
+	friends := friendlogic.NewService(friendmodel.NewMemoryRepo(), users, ids, nil)
+	moments := momentlogic.NewService(momentmodel.NewMemoryRepo(), friends, users, nil, ids)
+	users.BindAccountCleanup(nil, nil, friends, moments)
+	ctx := reqctx.With(t.Context(), &reqctx.RequestContext{RealIP: "10.0.0.1", Language: "zh-CN"})
+	a, err := users.AuthenticateEmail(ctx, "test01@spark.com", "1", &entity.LoginDevice{DeviceID: 1, DeviceType: entity.DeviceIOS})
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := users.AuthenticateEmail(ctx, "test02@spark.com", "1", &entity.LoginDevice{DeviceID: 2, DeviceType: entity.DeviceWeb})
+	if err != nil {
+		t.Fatal(err)
+	}
+	applied, err := friends.Apply(ctx, a.ID, &friendlogic.ApplyInput{Email: "test02@spark.com"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := friends.Accept(ctx, b.ID, friendlogic.AcceptInput{RequestID: applied.RequestID}); err != nil {
+		t.Fatal(err)
+	}
+	ctxA := reqctx.With(ctx, &reqctx.RequestContext{UserID: a.ID, RealIP: "10.0.0.1", Language: "zh-CN"})
+	pub, err := moments.Publish(ctxA, a.ID, &momentlogic.PublishInput{Text: "bye"})
+	if err != nil || pub == nil {
+		t.Fatalf("publish %+v %v", pub, err)
+	}
+	if err := users.DeleteAccount(ctx, a.ID); err != nil {
+		t.Fatal(err)
+	}
+	ok, err := friends.AreFriends(ctx, a.ID, b.ID)
+	if err != nil || ok {
+		t.Fatalf("friends after cancel %v %v", ok, err)
+	}
+	if _, err := moments.Get(ctx, b.ID, pub.ID); !errors.Is(err, errs.ErrNotFound) {
+		t.Fatalf("moment still visible %v", err)
+	}
+}
+
+func (m *memObjects) Delete(_ context.Context, key string) error {
+	delete(m.kv, key)
+	return nil
+}
diff --git a/internal/module/user/logic/service.go b/internal/module/user/logic/service.go
index 208076e..c49a1cd 100644
--- a/internal/module/user/logic/service.go
+++ b/internal/module/user/logic/service.go
@@ -22,6 +22,9 @@ type Repository interface {
 	UpsertDevice(ctx context.Context, d *entity.Device) error
 	GetDevice(ctx context.Context, userID int64, deviceID uint64) (*entity.Device, error)
 	InsertLoginLog(ctx context.Context, log *entity.LoginLog) error
+	GetEmail(ctx context.Context, userID int64) (string, error)
+	GetDeleted(ctx context.Context, id int64) (*entity.Deleted, error)
+	ArchiveAndDelete(ctx context.Context, d *entity.Deleted) error
 }
 
 // IDGen issues time-ordered Snowflake IDs (user PK).
@@ -36,12 +39,19 @@ type Objects interface {
 
 // Service is the user application use-case (HTTP and TCP share it).
 type Service struct {
-	repo    Repository
-	codes   CodeStore
-	ids     IDGen
-	objects Objects
+	repo     Repository
+	codes    CodeStore
+	ids      IDGen
+	objects  Objects
+	tokens   TokenRevoker
+	sessions SessionDropper
+	cleaners []UserDataCleaner
 }
 
 func NewService(repo Repository, codes CodeStore, ids IDGen, objects Objects) *Service {
 	return &Service{repo: repo, codes: codes, ids: ids, objects: objects}
 }
+
+func (s *Service) ready() bool {
+	return s != nil && s.repo != nil && s.ids != nil
+}
diff --git a/internal/module/user/model/memory.go b/internal/module/user/model/memory.go
index d758641..b698ae7 100644
--- a/internal/module/user/model/memory.go
+++ b/internal/module/user/model/memory.go
@@ -16,6 +16,7 @@ type MemoryRepo struct {
 	bySpark   map[string]int64
 	devices   map[deviceKey]*entity.Device
 	logs      []*entity.LoginLog
+	deleted   map[int64]*entity.Deleted
 	deviceSeq int64
 	logSeq    int64
 }
@@ -32,6 +33,7 @@ func NewMemoryRepo() *MemoryRepo {
 		bySpark: make(map[string]int64),
 		devices: make(map[deviceKey]*entity.Device),
 		logs:    make([]*entity.LoginLog, 0),
+		deleted: make(map[int64]*entity.Deleted),
 	}
 }
 
@@ -207,6 +209,71 @@ func (m *MemoryRepo) InsertLoginLog(_ context.Context, log *entity.LoginLog) err
 	return nil
 }
 
+func (m *MemoryRepo) GetEmail(_ context.Context, userID int64) (string, error) {
+	if userID <= 0 {
+		return "", errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	for email, id := range m.byEmail {
+		if id == userID {
+			return email, nil
+		}
+	}
+	return "", errs.ErrNotFound
+}
+
+func (m *MemoryRepo) GetDeleted(_ context.Context, id int64) (*entity.Deleted, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	row, ok := m.deleted[id]
+	if !ok {
+		return nil, errs.ErrNotFound
+	}
+	cp := *row
+	return &cp, nil
+}
+
+func (m *MemoryRepo) ArchiveAndDelete(_ context.Context, d *entity.Deleted) error {
+	if d == nil || d.ID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	u, ok := m.byID[d.ID]
+	if !ok {
+		return errs.ErrNotFound
+	}
+	email := d.Email
+	for em, id := range m.byEmail {
+		if id == d.ID {
+			email = em
+			delete(m.byEmail, em)
+			break
+		}
+	}
+	if d.DeletedAt.IsZero() {
+		d.DeletedAt = time.Now()
+	}
+	snap := entity.SnapshotDeleted(u, email, d.DeletedAt)
+	m.deleted[d.ID] = snap
+	delete(m.byID, d.ID)
+	delete(m.bySpark, u.SparkID)
+	for key := range m.devices {
+		if key.UserID == d.ID {
+			delete(m.devices, key)
+		}
+	}
+	kept := m.logs[:0]
+	for _, log := range m.logs {
+		if log != nil && log.UserID != d.ID {
+			kept = append(kept, log)
+		}
+	}
+	m.logs = kept
+	return nil
+}
+
 func (m *MemoryRepo) LoginLogs() []*entity.LoginLog {
 	m.mu.Lock()
 	defer m.mu.Unlock()
diff --git a/internal/module/user/model/user_delete.go b/internal/module/user/model/user_delete.go
new file mode 100644
index 0000000..5a80fdd
--- /dev/null
+++ b/internal/module/user/model/user_delete.go
@@ -0,0 +1,143 @@
+package model
+
+import (
+	"context"
+	"time"
+
+	"gorm.io/gorm"
+
+	"spark-server/internal/module/user/entity"
+	"spark-server/internal/pkg/errs"
+)
+
+// UserDelete maps table user_delete: archived row after account cancellation.
+type UserDelete struct {
+	ID           int64      `gorm:"column:id;primaryKey;comment:原 users.id（uid），Snowflake，不复用"`
+	SparkID      string     `gorm:"column:spark_id;comment:注销时的 Spark 账号"`
+	Nickname     string     `gorm:"column:nickname;comment:注销时的昵称"`
+	Avatar       string     `gorm:"column:avatar;comment:注销时的头像 object_key"`
+	QRCode       string     `gorm:"column:qrcode;comment:注销时的个人二维码票据"`
+	Birthday     *time.Time `gorm:"column:birthday;type:date;comment:注销时的生日"`
+	Gender       int        `gorm:"column:gender;comment:0=未知 1=男 2=女"`
+	Status       int        `gorm:"column:status;comment:注销前账号状态：1=正常 0=禁用"`
+	Email        string     `gorm:"column:email;comment:注销时绑定的邮箱，注销后可重新注册"`
+	LastLoginAt  *time.Time `gorm:"column:last_login_at;comment:注销前最近登录时间"`
+	LastActiveAt *time.Time `gorm:"column:last_active_at;comment:注销前最近活跃时间"`
+	CreatedAt    time.Time  `gorm:"column:created_at;comment:原注册时间"`
+	UpdatedAt    time.Time  `gorm:"column:updated_at;comment:原资料更新时间"`
+	DeletedAt    time.Time  `gorm:"column:deleted_at;comment:注销时间"`
+}
+
+func (UserDelete) TableName() string { return "user_delete" }
+
+func (r *UserDelete) entity() *entity.Deleted {
+	if r == nil {
+		return nil
+	}
+	return &entity.Deleted{
+		ID: r.ID, SparkID: r.SparkID, Nickname: r.Nickname, Avatar: r.Avatar, QRCode: r.QRCode,
+		Birthday: timeOrZero(r.Birthday), Gender: entity.Gender(r.Gender), Status: entity.Status(r.Status),
+		Email: r.Email, LastLoginAt: timeOrZero(r.LastLoginAt), LastActiveAt: timeOrZero(r.LastActiveAt),
+		CreatedAt: r.CreatedAt, UpdatedAt: r.UpdatedAt, DeletedAt: r.DeletedAt,
+	}
+}
+
+func deletedFrom(d *entity.Deleted) UserDelete {
+	row := UserDelete{
+		ID: d.ID, SparkID: d.SparkID, Nickname: d.Nickname, Avatar: d.Avatar, QRCode: d.QRCode,
+		Gender: int(d.Gender), Status: int(d.Status), Email: d.Email,
+		CreatedAt: d.CreatedAt, UpdatedAt: d.UpdatedAt, DeletedAt: d.DeletedAt,
+	}
+	row.Birthday = timePtr(d.Birthday)
+	row.LastLoginAt = timePtr(d.LastLoginAt)
+	row.LastActiveAt = timePtr(d.LastActiveAt)
+	return row
+}
+
+func (m *Repo) GetEmail(ctx context.Context, userID int64) (string, error) {
+	if userID <= 0 {
+		return "", errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return "", err
+	}
+	var bind UserEmail
+	if err := db.Where("user_id = ?", userID).Take(&bind).Error; err != nil {
+		return "", mapDBErr(err)
+	}
+	return bind.Email, nil
+}
+
+func (m *Repo) GetDeleted(ctx context.Context, id int64) (*entity.Deleted, error) {
+	if id <= 0 {
+		return nil, errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return nil, err
+	}
+	var row UserDelete
+	if err := db.Where("id = ?", id).Take(&row).Error; err != nil {
+		return nil, mapDBErr(err)
+	}
+	return row.entity(), nil
+}
+
+func (m *Repo) ArchiveAndDelete(ctx context.Context, d *entity.Deleted) error {
+	if d == nil || d.ID <= 0 {
+		return errs.ErrInvalidArgument
+	}
+	db, err := m.session(ctx)
+	if err != nil {
+		return err
+	}
+	if d.DeletedAt.IsZero() {
+		d.DeletedAt = time.Now()
+	}
+	return db.Transaction(func(tx *gorm.DB) error {
+		return archiveUserTx(tx, d)
+	})
+}
+
+func archiveUserTx(tx *gorm.DB, d *entity.Deleted) error {
+	var live User
+	if err := tx.Where("id = ?", d.ID).Take(&live).Error; err != nil {
+		return mapDBErr(err)
+	}
+	email := d.Email
+	var bind UserEmail
+	if err := tx.Where("user_id = ?", d.ID).Take(&bind).Error; err == nil {
+		email = bind.Email
+	}
+	d.Email = email
+	row := deletedFrom(d)
+	row.SparkID = live.SparkID
+	row.Nickname = live.Nickname
+	row.Avatar = live.Avatar
+	row.QRCode = live.QRCode
+	row.Birthday = live.Birthday
+	row.Gender = live.Gender
+	row.Status = live.Status
+	row.LastLoginAt = live.LastLoginAt
+	row.LastActiveAt = live.LastActiveAt
+	row.CreatedAt = live.CreatedAt
+	row.UpdatedAt = live.UpdatedAt
+	row.Email = email
+	if err := tx.Create(&row).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := tx.Where("user_id = ?", d.ID).Delete(&UserEmail{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := tx.Where("user_id = ?", d.ID).Delete(&UserDevice{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := tx.Where("user_id = ?", d.ID).Delete(&UserLoginLog{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	if err := tx.Where("id = ?", d.ID).Delete(&User{}).Error; err != nil {
+		return mapDBErr(err)
+	}
+	return nil
+}
diff --git a/internal/pkg/i18n/catalog_notify.go b/internal/pkg/i18n/catalog_notify.go
index 8666063..a3a3df8 100644
--- a/internal/pkg/i18n/catalog_notify.go
+++ b/internal/pkg/i18n/catalog_notify.go
@@ -8,6 +8,9 @@ func init() {
 		NotifyKickLogout: {
 			ZhCN: "已退出登录", En: "Signed out", ZhTW: "已登出",
 		},
+		NotifyKickDeleted: {
+			ZhCN: "账号已注销", En: "Account deleted", ZhTW: "帳號已註銷",
+		},
 		NotifyFriendRequest + ".title": {
 			ZhCN: "好友请求", En: "Friend request", ZhTW: "好友請求",
 		},
diff --git a/internal/pkg/i18n/keys.go b/internal/pkg/i18n/keys.go
index f5c9b71..39e192a 100644
--- a/internal/pkg/i18n/keys.go
+++ b/internal/pkg/i18n/keys.go
@@ -148,6 +148,7 @@ const (
 
 	NotifyKickReplaced  = "notify.kick.replaced"
 	NotifyKickLogout    = "notify.kick.logout"
+	NotifyKickDeleted   = "notify.kick.deleted"
 	NotifyFriendRequest = "notify.friend.request"
 	NotifyFriendBecame  = "notify.friend.became"
 	NotifyGroupInvite   = "notify.group.invite"
diff --git a/internal/transport/http/docs/openapi.yaml b/internal/transport/http/docs/openapi.yaml
index 349c762..9a78b51 100644
--- a/internal/transport/http/docs/openapi.yaml
+++ b/internal/transport/http/docs/openapi.yaml
@@ -688,6 +688,21 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Envelope"
+    delete:
+      tags: [users]
+      summary: 注销当前账号
+      description: |
+        吊销全部设备的 JWT 并踢掉 TCP。将 `users` 行迁入 `user_delete` 后删除原行（邮箱可重新注册）。
+        同时清除好友关系、朋友圈、收藏、群成员（群主把群转给一名管理员，没有管理员则转给成员表第一位后退出；仅剩自己则解散）、会话成员、收件箱 Redis 键与 mailbox。
+        对方仍可见历史消息（不删 `messages`）。
+      operationId: deleteMe
+      responses:
+        "200":
+          description: 统一 envelope
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Envelope"
   /v1/friends/lookup:
     get:
       tags: [friends]
diff --git a/internal/transport/http/handler/user/handler.go b/internal/transport/http/handler/user/handler.go
index 2839f2f..e8d1e44 100644
--- a/internal/transport/http/handler/user/handler.go
+++ b/internal/transport/http/handler/user/handler.go
@@ -50,3 +50,16 @@ func (h *Handler) PatchMe(c *gin.Context) {
 	}
 	respond.JSON(c, userlogic.PublicProfile(u))
 }
+
+func (h *Handler) DeleteMe(c *gin.Context) {
+	rc := reqctx.From(c.Request.Context())
+	if rc == nil || rc.UserID <= 0 {
+		respond.JSONError(c, errs.ErrUnauthorized)
+		return
+	}
+	if err := h.users.DeleteAccount(c.Request.Context(), rc.UserID); err != nil {
+		respond.JSONError(c, err)
+		return
+	}
+	respond.JSON(c, gin.H{})
+}
diff --git a/internal/transport/http/router.go b/internal/transport/http/router.go
index 4cc5f51..8f8f509 100644
--- a/internal/transport/http/router.go
+++ b/internal/transport/http/router.go
@@ -86,6 +86,7 @@ func registerUserRoutes(v1 *gin.RouterGroup, deps *EngineDeps) {
 	g := v1.Group("/users")
 	g.GET("/me", h.Me)
 	g.PATCH("/me", h.PatchMe)
+	g.DELETE("/me", h.DeleteMe)
 }
 
 func registerFriendRoutes(v1 *gin.RouterGroup, deps *EngineDeps) {
diff --git a/internal/transport/http/server_test.go b/internal/transport/http/server_test.go
index 4e36458..c46f766 100644
--- a/internal/transport/http/server_test.go
+++ b/internal/transport/http/server_test.go
@@ -151,6 +151,7 @@ func testLoginEngine(t *testing.T) *gin.Engine {
 		t.Fatal(err)
 	}
 	users := userlogic.NewService(usermodel.NewMemoryRepo(), usermodel.NewMemoryCodes(), ids, nil)
+	users.BindAccountCleanup(j, nil)
 	return NewEngine(zap.NewNop(), &EngineDeps{
 		Auth:  j,
 		Login: authlogic.NewLoginService(j, users),
@@ -357,6 +358,68 @@ func TestRefreshAndLogout(t *testing.T) {
 	}
 }
 
+func TestDeleteAccount(t *testing.T) {
+	r := testLoginEngine(t)
+	w := httptest.NewRecorder()
+	loginReq := httptest.NewRequest(http.MethodPost, "/v1/auth/login", strings.NewReader(`{"email":"test01@spark.com","verify_code":"any","device_id":7,"device_type":"ios"}`))
+	loginReq.Header.Set("Content-Type", "application/json")
+	r.ServeHTTP(w, loginReq)
+	var loginEnv reply.Envelope
+	if err := json.Unmarshal(w.Body.Bytes(), &loginEnv); err != nil {
+		t.Fatal(err)
+	}
+	if loginEnv.Code != "0" {
+		t.Fatalf("login %+v", loginEnv)
+	}
+	var tok authentity.IssuedToken
+	if err := json.Unmarshal(loginEnv.Data, &tok); err != nil {
+		t.Fatal(err)
+	}
+
+	w = httptest.NewRecorder()
+	delReq := httptest.NewRequest(http.MethodDelete, "/v1/users/me", nil)
+	delReq.Header.Set("Authorization", "Bearer "+tok.AccessToken)
+	r.ServeHTTP(w, delReq)
+	var delEnv reply.Envelope
+	if err := json.Unmarshal(w.Body.Bytes(), &delEnv); err != nil {
+		t.Fatal(err)
+	}
+	if delEnv.Code != "0" {
+		t.Fatalf("delete %+v", delEnv)
+	}
+
+	w = httptest.NewRecorder()
+	meReq := httptest.NewRequest(http.MethodGet, "/v1/users/me", nil)
+	meReq.Header.Set("Authorization", "Bearer "+tok.AccessToken)
+	r.ServeHTTP(w, meReq)
+	var meEnv reply.Envelope
+	if err := json.Unmarshal(w.Body.Bytes(), &meEnv); err != nil {
+		t.Fatal(err)
+	}
+	if meEnv.Code != errs.ErrUnauthorized.Code {
+		t.Fatalf("after delete %+v", meEnv)
+	}
+
+	w = httptest.NewRecorder()
+	again := httptest.NewRequest(http.MethodPost, "/v1/auth/login", strings.NewReader(`{"email":"test01@spark.com","verify_code":"any","device_id":7,"device_type":"ios"}`))
+	again.Header.Set("Content-Type", "application/json")
+	r.ServeHTTP(w, again)
+	var againEnv reply.Envelope
+	if err := json.Unmarshal(w.Body.Bytes(), &againEnv); err != nil {
+		t.Fatal(err)
+	}
+	if againEnv.Code != "0" {
+		t.Fatalf("re-register %+v", againEnv)
+	}
+	var next authentity.IssuedToken
+	if err := json.Unmarshal(againEnv.Data, &next); err != nil {
+		t.Fatal(err)
+	}
+	if next.UserID == tok.UserID {
+		t.Fatal("uid reused")
+	}
+}
+
 func TestLoginRejectsBadInput(t *testing.T) {
 	r := testLoginEngine(t)
 	w := httptest.NewRecorder()
diff --git a/internal/transport/tcp/session/conn_test.go b/internal/transport/tcp/session/conn_test.go
index 09564ee..aa8d95e 100644
--- a/internal/transport/tcp/session/conn_test.go
+++ b/internal/transport/tcp/session/conn_test.go
@@ -69,3 +69,24 @@ func TestKickDevice(t *testing.T) {
 		t.Fatal("expected empty")
 	}
 }
+
+func TestKickUser(t *testing.T) {
+	m := NewManager()
+	a := NewConn("s1", "10.0.0.1:1", 8)
+	a.Authenticate(3, 4)
+	b := NewConn("s2", "10.0.0.1:2", 8)
+	b.Authenticate(3, 5)
+	if err := m.Bind(a); err != nil {
+		t.Fatal(err)
+	}
+	if err := m.Bind(b); err != nil {
+		t.Fatal(err)
+	}
+	m.KickUser(3)
+	if a.State() != StateClosed || b.State() != StateClosed {
+		t.Fatalf("state %d %d", a.State(), b.State())
+	}
+	if len(m.GetUserSessions(3)) != 0 {
+		t.Fatal("expected empty")
+	}
+}
diff --git a/internal/transport/tcp/session/kick.go b/internal/transport/tcp/session/kick.go
index 9cb4833..87ebeb2 100644
--- a/internal/transport/tcp/session/kick.go
+++ b/internal/transport/tcp/session/kick.go
@@ -53,3 +53,22 @@ func (m *memManager) KickDevice(userID int64, deviceID uint64) {
 		delete(userMap, id)
 	}
 }
+
+func (m *memManager) KickUser(userID int64) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	userMap := m.byUser[userID]
+	if userMap == nil {
+		return
+	}
+	for id, existing := range userMap {
+		reason := i18n.T(i18n.Parse(existing.Language()), i18n.NotifyKickDeleted, nil)
+		_ = existing.Send(&Packet{
+			Command: protocol.CmdKick,
+			Body:    protocol.EncodeKick(existing.RequestID(), reason),
+		})
+		_ = existing.Close()
+		delete(m.byID, id)
+	}
+	delete(m.byUser, userID)
+}
diff --git a/internal/transport/tcp/session/manager.go b/internal/transport/tcp/session/manager.go
index 3da0d8a..2f9de5e 100644
--- a/internal/transport/tcp/session/manager.go
+++ b/internal/transport/tcp/session/manager.go
@@ -31,6 +31,7 @@ type Manager interface {
 	Get(sessionID string) (Session, bool)
 	GetUserSessions(userID int64) []Session
 	KickDevice(userID int64, deviceID uint64)
+	KickUser(userID int64)
 	SendToUserExceptDevice(ctx context.Context, userID int64, exceptDeviceID uint64, packet *Packet) error
 }
 
diff --git a/migrations/0017_user_delete.sql b/migrations/0017_user_delete.sql
new file mode 100644
index 0000000..2bbab6b
--- /dev/null
+++ b/migrations/0017_user_delete.sql
@@ -0,0 +1,21 @@
+-- Archived accounts. Live rows stay in users; cancellation copies then deletes.
+
+CREATE TABLE IF NOT EXISTS user_delete (
+    id               BIGINT PRIMARY KEY COMMENT '原 users.id（uid），Snowflake，不复用',
+    spark_id         VARCHAR(32) NOT NULL COMMENT '注销时的 Spark 账号',
+    nickname         VARCHAR(64) NOT NULL DEFAULT '' COMMENT '注销时的昵称',
+    avatar           VARCHAR(512) NOT NULL DEFAULT '' COMMENT '注销时的头像 object_key',
+    qrcode           VARCHAR(512) NOT NULL DEFAULT '' COMMENT '注销时的个人二维码票据',
+    birthday         DATE NULL COMMENT '注销时的生日',
+    gender           TINYINT NOT NULL DEFAULT 0 COMMENT '0=未知 1=男 2=女',
+    status           TINYINT NOT NULL DEFAULT 1 COMMENT '注销前账号状态：1=正常 0=禁用',
+    email            VARCHAR(255) NOT NULL DEFAULT '' COMMENT '注销时绑定的邮箱，注销后可重新注册',
+    last_login_at    DATETIME(3) NULL COMMENT '注销前最近登录时间',
+    last_active_at   DATETIME(3) NULL COMMENT '注销前最近活跃时间',
+    created_at       DATETIME(3) NOT NULL COMMENT '原注册时间',
+    updated_at       DATETIME(3) NOT NULL COMMENT '原资料更新时间',
+    deleted_at       DATETIME(3) NOT NULL COMMENT '注销时间',
+    KEY idx_email (email),
+    KEY idx_spark_id (spark_id),
+    KEY idx_deleted_at (deleted_at)
+) COMMENT='已注销用户档案。从 users 迁入后删除原行，邮箱与 spark_id 可重新注册';