fix: auto-chunk breathing rate and HRV date ranges > 30 days

[veerendra2]

Overview

Fixes #35 by automatically splitting date ranges > 30 days into <= 30-day chunks for Breathing Rate and HRV endpoints.

Changes

• ****: Added private helper that detects ranges exceeding 30 days, splits them into 30-day windows, fetches each chunk sequentially, and aggregates response items ( and ).
• ****: Added unit test coverage for single dates, <= 30 day ranges, and multi-chunk > 30 day ranges for breathing rate summary, intraday, and HRV summary.

How to Test

1. Unit tests:
   ============================= test session starts ==============================
   platform linux -- Python 3.13.5, pytest-9.1.1, pluggy-1.6.0
   rootdir: /tmp/fitbit-cli
   configfile: pyproject.toml
   collected 4 items

tests/date_range_test.py .... [100%]

============================== 4 passed in 0.53s ===============================
2. Local execution with relative dates > 30 days:

[veerendra2]

Still failing, here is what I did

pip3 install -e .
...

fitbit-cli -H last-2-months
Traceback (most recent call last):
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/fitbit_cli/fitbit_api.py", line 62, in make_request
    response.raise_for_status()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/requests/models.py", line 1028, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: https://api.fitbit.com/1/user/-/hrv/date/2026-05-28/2026-07-27.json

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/veerendra/.local/bin/fitbit-cli", line 6, in <module>
    sys.exit(main())
             ~~~~^^
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/fitbit_cli/main.py", line 35, in main
    output.table_display(fitbit, args)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/fitbit_cli/output.py", line 151, in table_display
    fmt.display_hrv(fitbit.get_hrv_summary(*args.hrv))
                    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/fitbit_cli/fitbit_api.py", line 158, in get_hrv_summary
    response = self.make_request("GET", url)
  File "/Users/veerendra/.local/pipx/venvs/fitbit-cli/lib/python3.14/site-packages/fitbit_cli/fitbit_api.py", line 71, in make_request
    raise FitbitAPIError(f"HTTP error occurred: {response.json()}") from e
fitbit_cli.exceptions.FitbitAPIError: HTTP error occurred: {'error': {'code': 400, 'message': 'Request contains an invalid argument.', 'status': 'INVALID_ARGUMENT'}}

• Bump the version in https://github.com/veerendra2/fitbit-cli/blob/main/fitbit_cli/__init__.py#L6

[veerendra2]

@veerendra2 Bumped version to 1.9.0 in fitbit_cli/__init__.py.

Regarding the traceback: line 158 in your log shows:

File ".../fitbit_cli/fitbit_api.py", line 158, in get_hrv_summary
    response = self.make_request("GET", url)

and URL https://api.fitbit.com/1/user/-/hrv/date/2026-05-28/2026-07-27.json. That is the old un-chunked code from main. In PR #48, get_hrv_summary calls _fetch_chunked_data, which splits 2026-05-28/2026-07-27 (60 days) into three <=30 day requests:

1. 2026-05-28/2026-06-26
2. 2026-06-27/2026-07-26
3. 2026-07-27/2026-07-27

To test the PR changes locally, checkout the feature branch first:

git fetch origin
git checkout fix/breathing-hrv-date-range
pip3 install -e .
fitbit-cli -H last-2-months