feat(追踪系统): 添加手动设置起始钢卷功能

- 后端添加设置起始钢卷API和钢卷查询API
- 前端实现起始钢卷选择界面和状态管理
- 优化追踪逻辑自动加载后续钢卷
- 添加本地存储保持起始钢卷设置

backend/main.py

@@ -411,6 +411,22 @@ async def save_opc_config(config: OpcConfig):
 
 @app.get("/api/opc/status")
 def opc_status():
+    # 获取当前正在追踪的4个钢卷
+    current_tracking_coils = []
+    try:
+        from sqlite_sync import sqlite_get_coil_track
+        coils = sqlite_get_coil_track()
+        current_tracking_coils = [
+            {
+                "coilid": coil.get("coilid", ""),
+                "sequencenb": coil.get("sequencenb", 0),
+                "rollprogramnb": coil.get("rollprogramnb", 0)
+            } 
+            for coil in coils[:4]
+        ]
+    except Exception as e:
+        logger.warning(f"Failed to get current tracking coils: {e}")
+    
     return {
         "running": opc_service.running,
         "last_counter": opc_service.last_counter,
@@ -418,6 +434,13 @@ def opc_status():
         "log": opc_service.event_log[-50:],
         "track_state": opc_service.track_state,
         "write_counter_last": opc_service.write_counter_last,
+        "tracking_info": {
+            "first_coilid": opc_service.first_coilid,  # 这个保持不变
+            "last_tracked_coilid": opc_service.last_tracked_coilid,
+            "end_coilid": opc_service.end_coilid,
+            "tracking_ended": opc_service.tracking_ended,
+            "current_tracking_coils": current_tracking_coils  # 当前正在追踪的4个钢卷
+        }
     }
 
 
@@ -664,3 +687,104 @@ async def simulate_signal2():
     """模拟信号2触发 - 更新追踪表"""
     await opc_service._handle_signal2()
     return {"message": "信号2已触发"}
+
+
+# ─────────────────────────────────────────────
+# Manual Starting Coil Configuration
+# ─────────────────────────────────────────────
+
+@app.post("/api/track/set-start-coil")
+async def set_start_coil(data: dict):
+    """设置手动起始钢卷ID用于追踪"""
+    coilid = data.get("coilid")
+    if not coilid:
+        raise HTTPException(status_code=400, detail="coilid不能为空")
+    
+    # 验证钢卷是否存在
+    conn = get_connection()
+    cursor = conn.cursor()
+    try:
+        cursor.execute("SELECT COUNT(*) FROM PLTM.PDI_PLTM WHERE COILID = :coilid", {"coilid": coilid})
+        if cursor.fetchone()[0] == 0:
+            raise HTTPException(status_code=404, detail=f"钢卷 {coilid} 不存在")
+    finally:
+        cursor.close()
+        conn.close()
+    
+    # 设置起始钢卷
+    opc_service.set_manual_start_coil(coilid)
+    
+    # 自动读取起始钢卷及后续3个钢卷到暂存表
+    try:
+        await opc_service._handle_signal1()
+    except Exception as e:
+        # 即使读取失败也不影响设置成功
+        logger.warning(f"Failed to load initial coils after setting start coil: {e}")
+    
+    return {"message": f"已设置起始钢卷: {coilid}"}
+
+
+@app.get("/api/track/available-coils")
+def get_available_coils(
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=200),
+    coilid: Optional[str] = None,
+    sequencenb_min: Optional[int] = None,
+    sequencenb_max: Optional[int] = None
+):
+    """获取可用的钢卷列表用于选择起始点（支持搜索和分页）"""
+    conn = get_connection()
+    cursor = conn.cursor()
+    try:
+        # 构建查询条件
+        conditions = []
+        params = {}
+        
+        if coilid:
+            conditions.append("COILID LIKE :coilid")
+            params["coilid"] = f"%{coilid}%"
+        
+        if sequencenb_min is not None:
+            conditions.append("SEQUENCENB >= :sequencenb_min")
+            params["sequencenb_min"] = sequencenb_min
+            
+        if sequencenb_max is not None:
+            conditions.append("SEQUENCENB <= :sequencenb_max")
+            params["sequencenb_max"] = sequencenb_max
+        
+        where_clause = ""
+        if conditions:
+            where_clause = "WHERE " + " AND ".join(conditions)
+        
+        # 查询总数
+        count_sql = f"SELECT COUNT(*) FROM PLTM.PDI_PLTM {where_clause}"
+        cursor.execute(count_sql, params)
+        total = cursor.fetchone()[0]
+        
+        # 分页查询
+        offset = (page - 1) * page_size
+        data_sql = f"""
+            SELECT COILID, SEQUENCENB, ROLLPROGRAMNB, STEEL_GRADE, 
+                   ENTRY_COIL_THICKNESS, ENTRY_COIL_WIDTH, ENTRY_COIL_WEIGHT
+            FROM PLTM.PDI_PLTM 
+            {where_clause}
+            ORDER BY COILID ASC
+        """
+        cursor.execute(data_sql, params)
+        
+        # 手动分页（因为Oracle的ROWNUM处理比较复杂）
+        all_rows = cursor.fetchall()
+        paginated_rows = all_rows[offset:offset + page_size]
+        
+        columns = [col[0].lower() for col in cursor.description]
+        rows = [dict(zip(columns, row)) for row in paginated_rows]
+        
+        return {
+            "data": rows,
+            "total": total,
+            "page": page,
+            "page_size": page_size
+        }
+    finally:
+        cursor.close()
+        conn.close()