feat: add setup notebook and update env example for Athena

app/components/tables.py

@@ -27,7 +27,14 @@ def value_editor(
     a notes column. Returns the edited DataFrame; the caller is responsible
     for converting it back to value-row dicts and PUTting to Athena.
     """
-    fields = [f for f in fields if f.get("table") == table]
+    fields = [
+        f
+        for f in fields
+        if f.get("table") == table
+        # Companion "<key>_initial" fields are edited via the Initial column
+        # on their parent cost row, not as standalone rows.
+        and not str(f.get("field_key", "")).endswith("_initial")
+    ]
     fields.sort(key=lambda f: int(f.get("sort_order") or 0))
 
     by_key = {v.get("field_key"): v for v in values}