fix: get_pending_detector_serial 不再删除记录，避免 B2 消费后 B4 拿不到序列号

- tb_state_tst DDL 增加 detector_serial VARCHAR(45) 列 + V2.4.0 迁移
- 新建 tb_pending_detector 表，用于 web 端暂存待插入的序列号
- insert_test_result / insert_wave_data 插入前从辅助表读取序列号（消费后清除）
- 新增 get_pending_detector_serial() 查询函数

src/models.py

@@ -100,6 +100,7 @@ async def _create_tables(pool: aiomysql.Pool):
                 CREATE TABLE IF NOT EXISTS `tb_state_tst` (
                     `id` INT AUTO_INCREMENT PRIMARY KEY,
                     `dnt_id` INT NOT NULL COMMENT 'FK → dnt_info.id',
+                    `detector_serial` VARCHAR(45) DEFAULT '' COMMENT '车检器序列号',
                     `dpg430_addr` TINYINT DEFAULT 0,
                     `pcnum` VARCHAR(10) DEFAULT '' COMMENT '批次号',
                     `serialnum` INT DEFAULT 0 COMMENT '流水号',
@@ -320,6 +321,26 @@ async def _create_tables(pool: aiomysql.Pool):
                 except Exception:
                     pass
 
+            # V2.4.0 迁移：tb_state_tst 增加车检器序列号
+            for col, col_def in [
+                ("detector_serial", "VARCHAR(45) DEFAULT '' COMMENT '车检器序列号'"),
+            ]:
+                try:
+                    await cur.execute(
+                        f"ALTER TABLE `tb_state_tst` ADD COLUMN `{col}` {col_def}"
+                    )
+                except Exception:
+                    pass
+
+            # 13. 待插入的车检器序列号表 (V2.4.0)
+            await cur.execute("""
+                CREATE TABLE IF NOT EXISTS `tb_pending_detector` (
+                    `dnt_id` INT PRIMARY KEY COMMENT 'FK → dnt_info.id',
+                    `detector_serial` VARCHAR(45) DEFAULT '' COMMENT '待插入的车检器序列号',
+                    `create_time` DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+                ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
+            """)
+
             # 11. 设备事件日志表
             await cur.execute("""
                 CREATE TABLE IF NOT EXISTS `tb_device_log` (
@@ -544,18 +565,19 @@ async def insert_test_result(dnt_id: int, dpg430_addr: int, pcnum: str,
                              relay_code: int = 0):
     """插入测试结果到 tb_state_tst"""
     coil_id, simulate_car_id = await get_fixture_coil_car_ids(dnt_id)
+    detector_serial = await get_pending_detector_serial(dnt_id)
     pool = await get_pool()
     async with pool.acquire() as conn:
         async with conn.cursor() as cur:
             await cur.execute(
                 """INSERT INTO tb_state_tst
-                   (dnt_id, dpg430_addr, pcnum, serialnum, sub_type, str_type,
+                   (dnt_id, detector_serial, dpg430_addr, pcnum, serialnum, sub_type, str_type,
                     test_mode, data_source,
                     iffinish, fault_info, relay_out, ppvalue, idle_freq,
                     enter_freq, exit_freq, enter_dist, exit_dist, enter_speed, exit_speed,
                     relay_code, coil_id, simulate_car_id)
-                   VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
-                (dnt_id, dpg430_addr, pcnum, serialnum, sub_type, str_type,
+                   VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
+                (dnt_id, detector_serial, dpg430_addr, pcnum, serialnum, sub_type, str_type,
                  test_mode, data_source,
                  iffinish, fault_info, relay_out, ppvalue, idle_freq,
                  enter_freq, exit_freq, enter_dist, exit_dist, enter_speed, exit_speed,
@@ -573,19 +595,20 @@ async def insert_wave_data(dnt_id: int, dpg430_addr: int,
     coil_id, simulate_car_id = await get_fixture_coil_car_ids(dnt_id)
     dev_type = await get_fixture_dev_type(dnt_id)
     str_type = await get_dev_type_name(dev_type) if dev_type else ""
+    detector_serial = await get_pending_detector_serial(dnt_id)
     pool = await get_pool()
     async with pool.acquire() as conn:
         async with conn.cursor() as cur:
             await cur.execute(
                 """INSERT INTO tb_state_tst
-                   (dnt_id, dpg430_addr, sub_type, str_type,
+                   (dnt_id, detector_serial, dpg430_addr, sub_type, str_type,
                     test_mode, data_source,
                     relay_out, relay_code,
                     remain_count, work_freq, curr_dist, speed,
                     near_dist, far_dist, b4_enter_dist, b4_leave_dist,
                     coil_id, simulate_car_id)
-                   VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
-                (dnt_id, dpg430_addr, dev_type, str_type,
+                   VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
+                (dnt_id, detector_serial, dpg430_addr, dev_type, str_type,
                  1, "B4",
                  relay_out, relay_code,
                  remain_count, work_freq, curr_dist, speed,
@@ -838,3 +861,20 @@ async def get_vehicle_base_test_by_type(type_num: int) -> dict | None:
                 (type_num,),
             )
             return await cur.fetchone()
+
+
+# ─── tb_pending_detector ───────────────────────────────────────────
+
+async def get_pending_detector_serial(dnt_id: int) -> str:
+    """获取待插入的车检器序列号"""
+    pool = await get_pool()
+    async with pool.acquire() as conn:
+        async with conn.cursor(aiomysql.DictCursor) as cur:
+            await cur.execute(
+                "SELECT detector_serial FROM tb_pending_detector WHERE dnt_id=%s",
+                (dnt_id,),
+            )
+            row = await cur.fetchone()
+            if row:
+                return row["detector_serial"] or ""
+            return ""