修复：告警状态流转统一 — 前端处理直接结单(CLOSED)，支持处理图片上传

1. handle接口状态映射：handled→CLOSED(而非CONFIRMED)，ignored→FALSE
2. handle_status同步设置：handled→DONE，ignored→IGNORED
3. 新增handle_image_url字段支持处理图片存储
4. 自动迁移：启动时自动ALTER TABLE添加新列

app/models.py

@@ -281,6 +281,7 @@ class AlarmEvent(Base):
     area_id = Column(BigInteger, comment="所属区域ID")
     handler = Column(String(64), comment="处理人")
     handle_remark = Column(Text, comment="处理备注")
+    handle_image_url = Column(String(512), comment="处理图片URL")
     handled_at = Column(DateTime, comment="处理时间")
     created_at = Column(DateTime, default=lambda: beijing_now())
     updated_at = Column(DateTime, default=lambda: beijing_now(),
@@ -312,6 +313,7 @@ class AlarmEvent(Base):
             "area_id": self.area_id,
             "handler": self.handler,
             "handle_remark": self.handle_remark,
+            "handle_image_url": self.handle_image_url,
             "handled_at": self.handled_at.strftime('%Y-%m-%d %H:%M:%S') if self.handled_at else None,
             "created_at": self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None,
             "updated_at": self.updated_at.strftime('%Y-%m-%d %H:%M:%S') if self.updated_at else None,
@@ -535,9 +537,27 @@ def get_session():
     return _SessionLocal()
 
 
+def _auto_migrate(engine):
+    """自动添加缺失的列（create_all 不会 ALTER 已有表）"""
+    from sqlalchemy import inspect, text
+    insp = inspect(engine)
+    migrations = [
+        ("alarm_event", "handle_image_url", "VARCHAR(512) COMMENT '处理图片URL'"),
+    ]
+    with engine.connect() as conn:
+        for table, column, col_def in migrations:
+            if table in insp.get_table_names():
+                existing = [c["name"] for c in insp.get_columns(table)]
+                if column not in existing:
+                    conn.execute(text(f"ALTER TABLE {table} ADD COLUMN {column} {col_def}"))
+                    conn.commit()
+
+
 def init_db():
     engine = get_engine()
     Base.metadata.create_all(bind=engine)
+    # 自动添加新列（ALTER TABLE 不会被 create_all 处理）
+    _auto_migrate(engine)
 
 
 class NotifyArea(Base):