[Copilot]

Three golden master integration tests were failing due to a combination of a snapshot bug, live API data drift, and an out-of-date golden fixture.

Changes

Fix: SEARCH_FIELDS ClassVar leaking into snapshots

_snapshot_object iterates dir(obj), which includes class-level ClassVar attributes (e.g. Transaction.SEARCH_FIELDS). Added _is_classvar_attr() to detect and skip them:

def _is_classvar_attr(obj: object, name: str) -> bool:
    for cls in type(obj).__mro__:
        try:
            hints = typing.get_type_hints(cls)
        except Exception:
            hints = getattr(cls, "__annotations__", {})
        if name in hints:
            return getattr(hints[name], "__origin__", None) is typing.ClassVar
    return False

Fix: transaction_first_result.json out of date

The Transaction model was expanded with ~30 new instance properties after the golden file was last recorded. Updated the fixture to include all new properties — null for search-only fields absent in award-scoped responses, Decimal(0.00) for aliased zero-amount fields, and type tags for volatile ones.

Fix: Data drift in funding_first_result and award_account_first_result

gross_outlay_amount, reporting_fiscal_month, obligated_amount, and total_transaction_obligated_amount are live financial figures that change as USASpending ingests and revises transactions. Added to VOLATILE_PROPERTIES so they're compared by type tag rather than pinned value, and updated the golden fixtures accordingly.

Also added the six new volatile properties to KNOWN_UNCOVERED in test_volatile_field_mapping.py — four are from Funding/AwardAccount models not covered by the Award-level volatile_fields tables, and two (award_internal_id, generated_unique_award_id) are API-forwarded identifiers with no coercion mapping to verify.