More email SKU shenanigans, now with more TEST labels!

app/return_labels.py

@@ -7,6 +7,8 @@ for the label-creation side of this.
 """
 from __future__ import annotations
 
+from typing import Optional
+
 from app import config
 from app.status_rules import parse_status_list
 
@@ -17,6 +19,10 @@ def get_emailed_label_skus() -> set[str]:
     )
 
 
-def is_emailed_label_order(skus: list[str]) -> bool:
-    emailed_skus = get_emailed_label_skus()
+def is_emailed_label_order(skus: list[str], emailed_skus: Optional[set] = None) -> bool:
+    """emailed_skus can be pre-fetched and passed in when checking many
+    orders at once (e.g. refreshing the table), to avoid re-reading
+    Settings from disk for every single order."""
+    if emailed_skus is None:
+        emailed_skus = get_emailed_label_skus()
     return any((sku or "").strip().lower() in emailed_skus for sku in skus or [])