diff --git a/docs/DEVIATIONS.md b/docs/DEVIATIONS.md
index d0f634c..610dab4 100644
--- a/docs/DEVIATIONS.md
+++ b/docs/DEVIATIONS.md
@@ -917,6 +917,15 @@
 - 备选方案：占满哈希池；未采用，给 MQTT 登录留槽位。
 - 影响：导入吞吐上升；冲突不再表现为无行号的 500。
 
+### 复审修复 H-05
+
+- 日期：2026-09-30
+- 原条款：PRD F11 最远可定到 365 天后（可配置）；审查 #48。
+- 实际做法：`validateEndpointFields` 增加 `MaxScheduleSeconds`，开通/修改/导入与端侧改默认延迟同一上限（0 ≤ delay ≤ max）。界面 `:max` 在 W-05。
+- 原因：后台原先只检查 `>= 0`，可设出永远发不出消息的端，极大值还会溢出。
+- 备选方案：导入超限静默改成上限；未采用，改为行错误让管理员改表。
+- 影响：超上限返回 400 或 CSV 行错误。
+
 ## 后台网页 W
 
 1. **W1–W3 阶段使用内存假数据，不请求真实 `/api/admin`**  
diff --git a/internal/admin/endpoints.go b/internal/admin/endpoints.go
index ba21f22..5e466cd 100644
--- a/internal/admin/endpoints.go
+++ b/internal/admin/endpoints.go
@@ -233,7 +233,7 @@ func (h *Handler) handleEndpointCreate(w http.ResponseWriter, r *http.Request) {
 	if req.DefaultDelaySeconds != nil {
 		delaySec = *req.DefaultDelaySeconds
 	}
-	if errMsg := validateEndpointFields(req.ID, req.Name, req.Remark, req.LoginPassword, req.TalkPassword, delaySec); errMsg != "" {
+	if errMsg := validateEndpointFields(req.ID, req.Name, req.Remark, req.LoginPassword, req.TalkPassword, delaySec, h.maxScheduleSeconds()); errMsg != "" {
 		h.audit(actorString(p), "endpoint_create", req.ID, "bad_request", ip)
 		httpx.WriteError(w, http.StatusBadRequest, "bad_request", errMsg)
 		return
@@ -341,10 +341,12 @@ func (h *Handler) handleEndpointPatch(w http.ResponseWriter, r *http.Request) {
 		httpx.WriteError(w, http.StatusBadRequest, "bad_request", "备注过长")
 		return
 	}
-	if req.DefaultDelaySeconds != nil && *req.DefaultDelaySeconds < 0 {
-		h.audit(actorString(p), "endpoint_patch", id, "bad_request", ip)
-		httpx.WriteError(w, http.StatusBadRequest, "bad_request", "默认延迟无效")
-		return
+	if req.DefaultDelaySeconds != nil {
+		if msg := validateDelaySeconds(*req.DefaultDelaySeconds, h.maxScheduleSeconds()); msg != "" {
+			h.audit(actorString(p), "endpoint_patch", id, "bad_request", ip)
+			httpx.WriteError(w, http.StatusBadRequest, "bad_request", msg)
+			return
+		}
 	}
 
 	hasMeta := req.Name != nil || req.Remark != nil || req.DefaultDelaySeconds != nil
@@ -614,7 +616,7 @@ func (h *Handler) handleEndpointUnlock(w http.ResponseWriter, r *http.Request) {
 	httpx.WriteOK(w, map[string]any{})
 }
 
-func validateEndpointFields(id, name, remark, loginPW, talkPW string, delaySec int64) string {
+func validateEndpointFields(id, name, remark, loginPW, talkPW string, delaySec, maxDelaySec int64) string {
 	if id != "" && !protocol.ValidEndpointID(id) {
 		return "编号不合法"
 	}
@@ -633,12 +635,26 @@ func validateEndpointFields(id, name, remark, loginPW, talkPW string, delaySec i
 	if !protocol.ValidTalkPassword(talkPW) {
 		return "对话密码不合法"
 	}
+	if msg := validateDelaySeconds(delaySec, maxDelaySec); msg != "" {
+		return msg
+	}
+	return ""
+}
+
+func validateDelaySeconds(delaySec, maxDelaySec int64) string {
 	if delaySec < 0 {
 		return "默认延迟无效"
 	}
+	if maxDelaySec > 0 && delaySec > maxDelaySec {
+		return "默认延迟无效"
+	}
 	return ""
 }
 
+func (h *Handler) maxScheduleSeconds() int64 {
+	return int64(h.cfg.Limits.MaxScheduleSeconds)
+}
+
 func writeCSVValidationError(w http.ResponseWriter, errs []csvLineError) {
 	httpx.WriteJSON(w, http.StatusBadRequest, httpx.Envelope{
 		OK: false,
diff --git a/internal/admin/endpoints_csv.go b/internal/admin/endpoints_csv.go
index ee56630..bf9844f 100644
--- a/internal/admin/endpoints_csv.go
+++ b/internal/admin/endpoints_csv.go
@@ -244,7 +244,7 @@ func (h *Handler) validateImportCSV(ctx context.Context, raw []byte) ([]importPr
 			}
 			delaySec = n
 		}
-		if msg := validateEndpointFields(id, name, remark, loginPW, talkPW, delaySec); msg != "" {
+		if msg := validateEndpointFields(id, name, remark, loginPW, talkPW, delaySec, h.maxScheduleSeconds()); msg != "" {
 			errs = append(errs, csvLineError{Line: line, Reason: msg})
 			continue
 		}
diff --git a/internal/admin/h05_test.go b/internal/admin/h05_test.go
new file mode 100644
index 0000000..1af4142
--- /dev/null
+++ b/internal/admin/h05_test.go
@@ -0,0 +1,61 @@
+package admin_test
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"testing"
+)
+
+func TestCreateRejectsDefaultDelayOverMax(t *testing.T) {
+	_, srv, client, _, _ := setupEndpoints(t)
+	body := `{"id":"dly-c","name":"延迟","login_password":"password1","default_delay_seconds":31536001}`
+	res := postJSON(t, client, srv.URL+"/api/admin/endpoints", body, csrfHeaders())
+	env := decodeEnv(t, res)
+	if res.StatusCode != http.StatusBadRequest {
+		t.Fatalf("want 400 got %d %+v", res.StatusCode, env)
+	}
+}
+
+func TestPatchRejectsDefaultDelayOverMax(t *testing.T) {
+	_, srv, client, _, _ := setupEndpoints(t)
+	res := postJSON(t, client, srv.URL+"/api/admin/endpoints",
+		`{"id":"dly-p","name":"延迟","login_password":"password1"}`, csrfHeaders())
+	env := decodeEnv(t, res)
+	if res.StatusCode != 200 || !env.OK {
+		t.Fatalf("create: %d %+v", res.StatusCode, env)
+	}
+	res = doReq(t, client, http.MethodPatch, srv.URL+"/api/admin/endpoints/dly-p",
+		`{"default_delay_seconds":31536001}`, csrfHeaders())
+	env = decodeEnv(t, res)
+	if res.StatusCode != http.StatusBadRequest {
+		t.Fatalf("want 400 got %d %+v", res.StatusCode, env)
+	}
+}
+
+func TestImportRejectsDefaultDelayOverMax(t *testing.T) {
+	_, srv, client, _, _ := setupEndpoints(t)
+	csvBody := "" +
+		"id,name,login_password,talk_password,default_delay_seconds,remark\n" +
+		"dly-i,甲,password1,,31536001,\n"
+	res := postImportCSV(t, client, srv.URL, csvBody)
+	raw, _ := io.ReadAll(res.Body)
+	_ = res.Body.Close()
+	if res.StatusCode != http.StatusBadRequest {
+		t.Fatalf("want 400 got %d body=%s", res.StatusCode, raw)
+	}
+	var parsed struct {
+		Data *struct {
+			Errors []struct {
+				Line   int    `json:"line"`
+				Reason string `json:"reason"`
+			} `json:"errors"`
+		} `json:"data"`
+	}
+	if err := json.Unmarshal(raw, &parsed); err != nil {
+		t.Fatal(err)
+	}
+	if parsed.Data == nil || len(parsed.Data.Errors) == 0 {
+		t.Fatalf("want row error, body=%s", raw)
+	}
+}