perf: replace RelationProxy.__getattribute__ with explicit count/clear

[collerek]

Summary

Profile-driven removal of the per-attribute-access Python override on RelationProxy. The previous __getattribute__ existed solely to redirect two list-method names (count, clear) to the QuerysetProxy versions; every other attribute access paid the cost of a Python-level __getattribute__ call only to fall through to super().

cProfile (all_with_related, 40 000 row hydrations): __getattribute__ was 0.354 s tottime / 6.2 % of scenario time, with 420 000 calls. After this change it is no longer in the top 25 by tottime — attribute access goes through the C-level lookup path.

Changes

• Define count() and clear() as explicit async methods directly on RelationProxy. They shadow list.count / list.clear by virtue of MRO and delegate to queryset_proxy after self._initialize_queryset().
• Delete the __getattribute__ override and the _QUERYSET_PROXY_METHODS frozenset.

The observable async semantics are unchanged: callers always did await proxy.count(...) / await proxy.clear(...). The previous override returned a bound async method from QuerysetProxy; the new methods are themselves async — both produce the same coroutine. Same signatures (distinct=True / keep_reversed=True defaults), same delegation path, same QuerysetProxy initialization trigger.

Benchmark deltas (median, pytest-benchmark, --warmup=on, 10+ rounds)

Test	Before	After	Δ
test_get_all_with_related_models[10]	2 449 µs	2 027 µs	−17.2 %
test_get_all_with_related_models[20]	3 999 µs	3 373 µs	−15.6 %
test_get_all_with_related_models[40]	7 106 µs	6 561 µs	−7.7 %
test_get_all[250]	5 764 µs	5 010 µs	−13.1 %
test_get_all[500]	10 345 µs	9 317 µs	−9.9 %
test_get_all[1000]	19 187 µs	17 972 µs	−6.4 %
test_iterate[*]	—	—	within noise
single-row get_one / first	—	—	I/O-dominated, ±15 % noise

Test plan

• make pre-commit — clean (one # type: ignore[override] for count since signature differs from Sequence.count)
• make coverage — 628 passed, 25 skipped, 100.00 % coverage
• tests/test_relations/, tests/test_queries/test_queryproxy_on_m2m_models.py, test_aggr_functions.py, test_reverse_fk_queryset.py all green
• cProfile on all_with_related confirms __getattribute__ no longer in top-25 by tottime

🤖 Generated with Claude Code