删除多线程产图

app/api/qgis_map_export.py

@@ -28,14 +28,6 @@ logger = get_logger("api.qgis")
 
 router = APIRouter(prefix="/qgis", tags=["专题图导出"])
 
-# 线程池（按配置初始化 worker 数量）
-_worker_threads = getattr(settings, "QGIS_WORKER_THREADS", 4)
-_thread_pool = concurrent.futures.ThreadPoolExecutor(
-    max_workers=_worker_threads,
-    thread_name_prefix="qgis-worker",
-)
-logger.info(f"QGIS 线程池初始化: {_worker_threads} workers")
-
 # 去重锁
 _in_progress_locks: dict[str, asyncio.Lock] = {}
 _locks_lock = asyncio.Lock()
@@ -478,12 +470,3 @@ def _generate_maps_subprocess(chunk_models: list, config: dict, chunk_idx: int)
 
     logger.warning(f"[子进程{chunk_idx}] 无输出")
     return []
-
-# ============================================================
-# 清理函数
-# ============================================================
-
-def shutdown_thread_pool() -> None:
-    """关闭线程池（在 server.py lifespan 关闭阶段调用）"""
-    _thread_pool.shutdown(wait=False)
-    logger.info("QGIS 线程池已关闭")