feat：优化增量执行、工具调用容错与评测体系

app/datafiles/query.py

@@ -87,8 +87,13 @@ def run_query(
     )
 
 
-def connect(tables: Mapping[str, Path]) -> duckdb.DuckDBPyConnection:
-    """建好视图并锁定的连接；列概况也用它，和模型查询看到的数据一致"""
+def connect(
+    tables: Mapping[str, Path], *, threads: int = THREADS
+) -> duckdb.DuckDBPyConnection:
+    """建好视图并锁定的连接；列概况也用它，和模型查询看到的数据一致
+
+    threads 只给解析子进程算列概况时放宽，模型写的查询一律用 THREADS
+    """
     connection = duckdb.connect(
         ":memory:",
         config={
@@ -96,7 +101,7 @@ def connect(tables: Mapping[str, Path]) -> duckdb.DuckDBPyConnection:
             "autoload_known_extensions": False,
             "python_enable_replacements": False,
             "memory_limit": MEMORY_LIMIT,
-            "threads": THREADS,
+            "threads": threads,
         },
     )
     try: