feat(db): add datetime column dual-caret sort on inventory and weighing lists.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_db_list_sort.py

@@ -0,0 +1,41 @@
+from app.models.db_models import DbInboundOutbound, DbWeighingSlip
+from app.services.db.list_sort import (
+    order_inventory,
+    order_weighing,
+    parse_sort_params,
+    weighing_needs_inventory_join,
+)
+
+
+def test_inventory_date_asc():
+    expr = order_inventory("date", "asc")
+    assert "date" in str(expr).lower()
+    assert "asc" in str(expr).lower()
+
+
+def test_inventory_invalid_falls_back():
+    default = DbInboundOutbound.date.desc()
+    assert order_inventory("hack", "asc", default=default) is default
+
+
+def test_weighing_inventory_date_desc():
+    expr = order_weighing("inventoryDate", "desc")
+    assert "date" in str(expr).lower()
+    assert "desc" in str(expr).lower()
+
+
+def test_weighing_needs_join():
+    assert weighing_needs_inventory_join("inventoryDate", "asc") is True
+    assert weighing_needs_inventory_join("inventoryDate", "nope") is False
+    assert weighing_needs_inventory_join(None, "asc") is False
+
+
+def test_parse_sort_params_camel():
+    sf, so = parse_sort_params({"sortField": "date", "sortOrder": "asc"})
+    assert sf == "date"
+    assert so == "asc"
+
+
+def test_weighing_invalid_falls_back():
+    default = DbWeighingSlip.gross_weight_time.desc()
+    assert order_weighing("hack", "asc", default=default) is default