Theo/ts rate fix

[xinyue-uoft]

Description

Addressing the issue #74 .

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature or enhancement (non-breaking change which adds functionality)
• Optimization (non-breaking change that improves code/performance)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Testing checklist

• Unit tests pass (e.g. dbt-build --unittest)
• Minimal system quicktest passes (pytest -s minimal_system_quick_test.py)
• Full set of integration tests pass (dunedaq_integtest_bundle.sh)
• Python tests pass if applicable (e.g. python -m pytest)
• Pre-commit hooks run successfully if applicable (e.g. pre-commit run --all-files)

Integration test note: daqsystemtest::3ru_1df_multirun_test

Across three sequential runs of this integration test, the
resulting HDF5 files contain 139, 140, and 140 trigger records respectively,
while the test expects 132.5 ± 6.5 (range 126.0–139.0). Two of the three runs
therefore overshoot the upper bound by 1 record and triggers the fail. All other
validations pass for these files. The remaining 5 of 6
subtests in 3ru_1df_multirun_test (WIBEth_System ×3, plus Software_TPG_System
test_nanorc_success and test_log_files) pass, and example_system_test had transient connection issue and pass on rerun. The shift appears consistent.

Note on Current develop branch:

max_file_size_test::test_tpstream_files failes by having 7 record files instead of 6. Same daqsystemtest::3ru_1df_multirun_test also persists.

Further checks

• Code is commented where needed, particularly in hard-to-understand areas
• Code style is correct (dbt-build --lint, and/or see https://dune-daq-sw.readthedocs.io/en/latest/packages/styleguide/)
• If applicable, new tests have been added or an issue has been opened to tackle that in the future.
  (Indicate issue here: # (issue))