diff --git a/algorithms.py b/algorithms.py
index fc70e03..48d8686 100644
--- a/algorithms.py
+++ b/algorithms.py
@@ -155,9 +155,9 @@ class LeavePostAlgorithm:
                         "track_id": roi_id,
                         "camera_id": camera_id,
                         "bbox": bbox,
-                        "off_duty_duration": elapsed,
+                        "duration_minutes": elapsed_minutes,
                         "alert_type": "leave_post",
-                        "message": f"离岗超过 {elapsed_minutes} 分钟",
+                        "message": f"离岗 {elapsed_minutes} 分钟",
                     })
                     self.alert_cooldowns[cooldown_key] = now
 
diff --git a/config/database.py b/config/database.py
index f8ace3a..3fca865 100644
--- a/config/database.py
+++ b/config/database.py
@@ -48,6 +48,7 @@ class AlertRecord:
     status: str = "pending"
     created_at: datetime = field(default_factory=datetime.now)
     processed_at: Optional[datetime] = None
+    duration_minutes: Optional[float] = None
 
 
 class SQLiteManager:
@@ -121,7 +122,8 @@ class SQLiteManager:
                 image_path TEXT,
                 status TEXT DEFAULT 'pending',
                 created_at TEXT NOT NULL,
-                processed_at TEXT
+                processed_at TEXT,
+                duration_minutes REAL
             )
         """)
         
@@ -242,8 +244,9 @@ class SQLiteManager:
                     INSERT OR REPLACE INTO alert_records (
                         alert_id, camera_id, roi_id, alert_type,
                         target_class, confidence, bbox, message,
-                        image_path, status, created_at, processed_at
-                    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+                        image_path, status, created_at, processed_at,
+                        duration_minutes
+                    ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
                 """, (
                     record['alert_id'],
                     record['camera_id'],
@@ -257,6 +260,7 @@ class SQLiteManager:
                     record.get('status', 'pending'),
                     record['created_at'],
                     record.get('processed_at'),
+                    record.get('duration_minutes'),
                 ))
             
             self._conn.commit()
@@ -290,6 +294,7 @@ class SQLiteManager:
             'status': alert.status,
             'created_at': alert.created_at.isoformat(),
             'processed_at': alert.processed_at.isoformat() if alert.processed_at else None,
+            'duration_minutes': alert.duration_minutes,
         }
         self._write_queue.put(record)