"""Phase 21 — performance benchmarks for informix-db.

These tests are gated behind the ``benchmark`` marker and excluded from
the default ``pytest`` run. To run:

  make bench                # all benchmarks
  uv run pytest -m benchmark tests/benchmarks/test_codec_perf.py

Codec micro-benchmarks (``test_codec_perf.py``) run without a server
and are fast enough for tight inner-loop iteration. End-to-end
benchmarks (SELECT/INSERT/pool) require an Informix container.

Output goes to ``.benchmarks/`` (gitignored). Persistent baseline at
``tests/benchmarks/baseline.json`` is updated manually with::

  uv run pytest -m benchmark --benchmark-only \
      --benchmark-save=baseline --benchmark-storage=tests/benchmarks/

Then copy ``.benchmarks/Linux-CPython-X.Y/000N_baseline.json`` to
``tests/benchmarks/baseline.json``.
"""