diff --git a/monitor/service_update_jobs.py b/monitor/service_update_jobs.py
index 4c5cfff..d543e13 100644
--- a/monitor/service_update_jobs.py
+++ b/monitor/service_update_jobs.py
@@ -19,8 +19,6 @@ from .service_release import deploy_updated_services_payload
 
 # 内存里最多保留最近若干次更新记录，避免 deploy 机常驻进程越跑越大。
 MAX_UPDATE_OPERATIONS = 20
-# 单次更新最多保留最近这些日志行，超出后丢弃最旧的。
-MAX_UPDATE_LOG_LINES = 1200
 # 任务状态和完整日志统一落到 run 目录。
 UPDATE_JOB_DIR = ROOT / "run" / "service_update_jobs"
 # 统一保护任务状态的锁。
@@ -115,10 +113,6 @@ def recover_lost_running_job_unlocked(payload: dict[str, Any]) -> None:
             "message": message,
         }
     )
-    if len(payload["logs"]) > MAX_UPDATE_LOG_LINES:
-        overflow = len(payload["logs"]) - MAX_UPDATE_LOG_LINES
-        payload["logs"] = payload["logs"][overflow:]
-        payload["logDroppedCount"] = int(payload.get("logDroppedCount") or 0) + overflow
 
     append_log_file(payload["operationId"], f"[{now}] [failed] [error] {message}\n")
     persist_job_unlocked(payload)
@@ -208,7 +202,7 @@ def trim_jobs_unlocked() -> None:
 
 
 def append_job_log(operation_id: str, stage: str, message: str, *, level: str = "info") -> None:
-    # 每条日志都带时间和阶段，页面可以直接展示。
+    # 每条日志都带时间和阶段，页面和状态文件都保留完整日志。
     text = str(message or "").rstrip()
     if not text:
         return
@@ -228,10 +222,6 @@ def append_job_log(operation_id: str, stage: str, message: str, *, level: str =
                 "message": text,
             }
         )
-        if len(payload["logs"]) > MAX_UPDATE_LOG_LINES:
-            overflow = len(payload["logs"]) - MAX_UPDATE_LOG_LINES
-            payload["logs"] = payload["logs"][overflow:]
-            payload["logDroppedCount"] = int(payload.get("logDroppedCount") or 0) + overflow
         append_log_file(
             operation_id,
             f"[{payload['updatedAt']}] [{str(stage or '').strip() or payload['stage']}] [{str(level or 'info').strip() or 'info'}] {text}\n",
diff --git a/static/index.html b/static/index.html
index 200ea09..b0a3dbb 100644
--- a/static/index.html
+++ b/static/index.html
@@ -494,7 +494,6 @@
                 <span class="badge neutral mono">阶段：{{ updateOps.stage || '-' }}</span>
                 <span class="badge neutral">开始：{{ formatDateTime(updateOps.startedAt) }}</span>
                 <span v-if="updateOps.finishedAt" class="badge neutral">结束：{{ formatDateTime(updateOps.finishedAt) }}</span>
-                <span v-if="updateOps.logDroppedCount > 0" class="badge warn">已截断 {{ updateOps.logDroppedCount }} 行旧日志</span>
             </div>
 
             <section v-if="updateOps.operationId || updateOps.running || updateOps.logs.length > 0" class="update-log-panel">