init: Prefect ETL sync project (RIIN/SDS → PG) with 12 sync flows

api/_common/concurrency.py

@@ -0,0 +1,22 @@
+"""并发执行辅助:线程池 + 信号量,对应 TS SDK 的 ConcurrentLimiter(默认 10)。"""
+
+from __future__ import annotations
+
+from collections.abc import Callable
+from concurrent.futures import ThreadPoolExecutor
+from typing import Any, TypeVar
+
+T = TypeVar("T")
+
+_DEFAULT_CONCURRENCY = 10
+
+
+def run_concurrent(
+    funcs: list[Callable[[], T]],
+    limit: int = _DEFAULT_CONCURRENCY,
+) -> list[T]:
+    """并发执行一批无参 callable(每个返回一个结果),保持输入顺序返回结果。"""
+    if not funcs:
+        return []
+    with ThreadPoolExecutor(max_workers=max(1, min(limit, len(funcs)))) as pool:
+        return list(pool.map(lambda fn: fn(), funcs))