diff --git a/docs/03-business-rules-and-glossary.md b/docs/03-business-rules-and-glossary.md
index af3871d..3e3894c 100644
--- a/docs/03-business-rules-and-glossary.md
+++ b/docs/03-business-rules-and-glossary.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Business-Rules-and-Glossary
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Business-Rules-and-Glossary.-
-wiki_revision: 3f2294d5f038cc6f3c3e707a44f528c697c01b38
-synchronized_at: 2026-09-10T09:38:15Z
+wiki_revision: 0fed160ce43d6ad5cecc1f9f2acdeca91a72fda6
+synchronized_at: 2026-09-10T12:02:08Z
 <!-- gitea-wiki-mirror:end -->
 
 # 业务规则与术语
@@ -58,3 +58,10 @@ M0 固定首发语言语料、词条身份规则、短语选择与重叠规则
 - 每次请求读取账号当前状态与会话有效期；学习数据由认证身份确定，管理员权限不能解除学习接口的本人过滤。
 - 两端分别使用 lexgo-admin-token、lexgo-learner-token 的 sessionStorage；401、退出和账号切换清除私人状态，以代次检查阻止迟到响应恢复旧数据。管理端拒绝学习者并撤销其新会话；撤销服务异常会提示未确认，不冒充服务端退出成功。
 - 新建账号拥有英语空空间。此处没有书籍、阅读、词典或复习功能，不把空页面视为学习业务已实现。
+
+
+## 已有账号登录与新密码规则
+
+登录仅校验用户名格式及密码非空、不超过 bcrypt 的 72 字节上限，随后校验数据库中已有的密码哈希；不再用新建账号的密码长度下限拒绝已有凭据。错误密码继续返回 401，空密码、超长密码和非法用户名返回 400。登录限流、bcrypt 校验、禁用账号和会话撤销机制不变。
+
+管理端创建账号、常规重置密码和首次 bootstrap 继续要求 10～72 字节。用户明确要求的本机指定账号凭据由管理员维护事务设置，不构成通用创建规则变更；密码更新须同时撤销该账号旧会话。密码值只能保存在本机安全配置中。
diff --git a/docs/04-local-development-and-verification.md b/docs/04-local-development-and-verification.md
index c06d7c6..ea74161 100644
--- a/docs/04-local-development-and-verification.md
+++ b/docs/04-local-development-and-verification.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Local-Development-and-Verification
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Local-Development-and-Verification.-
-wiki_revision: 440098c7120992b136eb2e192af211a871245df1
-synchronized_at: 2026-09-10T11:54:37Z
+wiki_revision: 37dd505cecc83c5ab05523ff5fb3339a1652ccd5
+synchronized_at: 2026-09-10T12:02:10Z
 <!-- gitea-wiki-mirror:end -->
 
 # 本地开发与验证
@@ -161,3 +161,12 @@ supervisor 直接管理编译后的 Go 进程，运行时不调用 Python。数
 后端交接验证：停止时 8000 端口释放，重新启动后 lexgo-api 为 Running、/healthz 返回 200，两端 /api/v1/me 均返回预期 401。原有 11 个实例（含两个前端）的 PID 与状态均未变化。
 
 验证结果：两个实例均为 Running，两端首页 HTTP 200，未登录请求 /api/v1/me 经代理返回预期 HTTP 401；已有 9 个实例的状态和 PID 均未变化。已交接并停止之前的手动前端进程。
+
+
+## 本机验收账号维护（2026-09-10）
+
+用户指定的管理账号 admin 已更新密码，并创建普通学习账号 dev 及其独立英语空间。指定密码只保存在忽略的 .local/account-credentials.json；.env.local 的 LEXGO_BOOTSTRAP_PASSWORD 已同步管理员当前密码，但仍不可对已有数据库重复执行 bootstrap。此前 learner_a / learner_b 测试账号保持原样。
+
+两个指定账号通过本机管理员事务设置密码哈希并撤销旧会话；这是已获用户授权的本地维护操作。普通管理页面创建/重置密码仍要求 10～72 字节，登录则直接验证已有非空密码，不以新密码下限拒绝已有账号。
+
+新增真实 MySQL 回归测试覆盖已有短密码登录、错误密码拒绝、创建/常规重置仍拒绝短密码；已观察测试先失败再通过，完整后端集成测试通过。重新编译并由 supervisor 启动 lexgo-api 后，admin 管理端登录和 dev 学习端登录均成功，dev 的 /accounts 返回 403、英语空间归属正确，退出后的 token 返回 401。
diff --git a/server/app/lexgo/integration_test.go b/server/app/lexgo/integration_test.go
index 674b6fc..975e9d0 100644
--- a/server/app/lexgo/integration_test.go
+++ b/server/app/lexgo/integration_test.go
@@ -100,6 +100,38 @@ func randomName(prefix string) string {
 	return prefix + hex.EncodeToString(b)
 }
 
+func TestMySQLLoginUsesStoredPasswordWithoutChangingCreationPolicy(t *testing.T) {
+	db := testDB(t)
+	// Fictional legacy credential: login verifies the stored hash independently
+	// of the policy applied when creating accounts or setting new passwords.
+	legacyPassword := strings.Repeat("z", 6)
+	u := admin.SysUser{Username: randomName("legacy"), Password: legacyPassword, RoleId: 1, Status: "2"}
+	if err := db.Create(&u).Error; err != nil {
+		t.Fatal("fixture creation failed")
+	}
+	r := Router(db, time.Now)
+	token := loginToken(t, r, u.Username, legacyPassword)
+	for _, password := range []string{strings.Repeat("y", 6), strings.Repeat("z", 5)} {
+		code, _ := callAPI(t, r, "POST", "/api/v1/login", "", map[string]string{"username": u.Username, "password": password})
+		if code != 401 {
+			t.Fatalf("incorrect stored password status %d, want 401", code)
+		}
+	}
+	code, _ := callAPI(t, r, "POST", "/api/v1/accounts", token, map[string]string{"username": randomName("new"), "password": legacyPassword})
+	if code != 400 {
+		t.Fatalf("short new password status %d, want 400", code)
+	}
+	learner, err := createAccount(db, randomName("reset"), fixturePassword, 2, u.UserId)
+	if err != nil {
+		t.Fatal(err)
+	}
+	code, _ = callAPI(t, r, "PATCH", fmt.Sprintf("/api/v1/accounts/%d", learner.ID), token, map[string]string{"password": legacyPassword})
+	if code != 400 {
+		t.Fatalf("short reset password status %d, want 400", code)
+	}
+	loginToken(t, r, learner.Username, fixturePassword)
+}
+
 func TestMySQLAccountIsolationAndRevocation(t *testing.T) {
 	db := testDB(t)
 	if err := Migrate(db); err != nil {
diff --git a/server/app/lexgo/router.go b/server/app/lexgo/router.go
index d3f5d70..90ed571 100644
--- a/server/app/lexgo/router.go
+++ b/server/app/lexgo/router.go
@@ -42,7 +42,7 @@ func Router(db *gorm.DB, now func() time.Time) *gin.Engine {
 			respond(c, 400, nil, err)
 			return
 		}
-		name, err := credentials(input.Username, input.Password)
+		name, err := loginCredentials(input.Username, input.Password)
 		if err != nil {
 			respond(c, 400, nil, err)
 			return
diff --git a/server/app/lexgo/router_test.go b/server/app/lexgo/router_test.go
index c29c6f5..408e541 100644
--- a/server/app/lexgo/router_test.go
+++ b/server/app/lexgo/router_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"
 )
@@ -13,7 +14,7 @@ func TestLoginRejectsEmailAndMissingPasswordBeforeDatabase(t *testing.T) {
 	for _, payload := range []string{
 		`{"username":"person@example.test","password":"example-password"}`,
 		`{"username":"learner","password":""}`,
-		`{"username":"learner","password":"short"}`,
+		`{"username":"learner","password":"` + strings.Repeat("x", 73) + `"}`,
 	} {
 		w := httptest.NewRecorder()
 		q := httptest.NewRequest(http.MethodPost, "/api/v1/login", bytes.NewBufferString(payload))
diff --git a/server/app/lexgo/service.go b/server/app/lexgo/service.go
index a7390cf..b95f10d 100644
--- a/server/app/lexgo/service.go
+++ b/server/app/lexgo/service.go
@@ -62,12 +62,25 @@ func failure(code int, msg string) error { return &apiError{code, msg} }
 var usernamePattern = regexp.MustCompile(`^[a-z][a-z0-9_.-]{2,31}$`)
 
 func credentials(username, password string) (string, error) {
+	name, err := loginCredentials(username, password)
+	if err != nil {
+		return "", err
+	}
+	if len(password) < 10 {
+		return "", failure(400, "密码须为 10～72 字节")
+	}
+	return name, nil
+}
+
+// Login verifies an existing hash; account creation and normal password resets
+// separately enforce the current minimum password length.
+func loginCredentials(username, password string) (string, error) {
 	username = strings.ToLower(strings.TrimSpace(username))
 	if !usernamePattern.MatchString(username) {
 		return "", failure(400, "账号须为字母开头的 3～32 位字母、数字、点、下划线或连字符")
 	}
-	if len(password) < 10 || len(password) > 72 {
-		return "", failure(400, "密码须为 10～72 字节")
+	if len(password) == 0 || len(password) > 72 {
+		return "", failure(400, "密码不能为空且不能超过 72 字节")
 	}
 	return username, nil
 }