fix: coordinate concurrent account capacity filling

modelhub_submmit_api/history_stats.py

@@ -5,7 +5,7 @@ from datetime import datetime
 from pathlib import Path
 from typing import Any
 
-from common import append_jsonl, ensure_utc, parse_datetime, read_jsonl, write_jsonl
+from common import append_jsonl, ensure_utc, parse_datetime, read_jsonl, update_jsonl
 
 
 WAITING_STATUSES = {"waiting", "queued"}
@@ -32,10 +32,10 @@ def update_history_archive(
     *,
     limit: int = HISTORY_ARCHIVE_LIMIT_DEFAULT,
 ) -> list[dict[str, Any]]:
-    merged = merge_history_records(load_history_archive(path), tasks, limit=limit)
-    path.parent.mkdir(parents=True, exist_ok=True)
-    write_jsonl(path, merged)
-    return merged
+    return update_jsonl(
+        path,
+        lambda existing: merge_history_records(existing, tasks, limit=limit),
+    )
 
 
 def merge_history_records(