[PD1-465] Fixed Cvec class params

[michal-chrobok-semantive]

• Removed email and publishable key from Cvec class constructor params
• Renamed password to api_key
• Added logic for fetching publishable key from /config endpoint
• Added logic for construction of user email for auth
• Modified example scripts

[linear]

PD1-465 SDK should use API Key rather than username & password

cvec-python/examples/get_spans_example.py

Lines 7 to 9 in 336e17c

	host=os.environ.get("CVEC_HOST", "https://your-subdomain.cvector.dev"),
	email=os.environ.get("CVEC_EMAIL", "your-email@cvector.app"),
	password=os.environ.get("CVEC_PASSWORD", "your-password"),

The SDK should be responsible for splitting the API Key into "username" and "password". The requirement to split the key is an implementation detail due to the limitation of our current auth provider. In the future, we will improve this (by moving to a more capable auth provider), but will strive to maintain compatibility.

Therefore, the user should just manage the single API Key as an opaque secret value.

Similarly, get the CVEC_PUBLISHABLE_KEY from the /config resource as in https://github.com/CVector-Energy/ui/pull/105/files#diff-4c4160f55a2aadeac4efa96a843696d4f9f0d98b1329909b05cb9db4a8ffcce4R85-R86. Do not accept it as an environment variable. The Supabase publishable key is another Supabase friction/detail detail that shouldn't impact the user.

Also see this SDK setup: https://github.com/CVector-Energy/cvec-iot/pull/2/files#diff-c989b78806f11ebc41fcc62b339831ff9ef486a0643d9390d3b291ee31fed4f1R34-R37

[joshuanapoli]

I think that sandbox backend is setup for, but there is still some discrepancy with the SDK:

(.venv) joshuanapoli@mac cvec-python % CVEC_HOST=https://sandbox.cvector.dev CVEC_API_KEY=cva_hHs0CbkKALxMnxUdI9hanF0TBPvvvr1HjG6O python
Python 3.13.3 (main, Apr  8 2025, 13:54:08) [Clang 16.0.0 (clang-1600.0.26.6)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import cvec
... from datetime import datetime
...
>>> cvec = cvec.CVec()
>>> for item in cvec.get_metrics(start_at=datetime(2025, 7, 14, 10, 0, 0), end_at=datetime(2025, 7, 14, 11, 0, 0)):
...   print(item.name)
...
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    for item in cvec.get_metrics(start_at=datetime(2025, 7, 14, 10, 0, 0), end_at=datetime(2025, 7, 14, 11, 0, 0)):
                ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/joshuanapoli/src/cvec-python/src/cvec/cvec.py", line 275, in get_metrics
    response_data = self._make_request("GET", "/api/metrics/", params=params)
  File "/Users/joshuanapoli/src/cvec-python/src/cvec/cvec.py", line 143, in _make_request
    response.raise_for_status()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/joshuanapoli/src/cvec-python/.venv/lib/python3.13/site-packages/requests/models.py", line 1026, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://sandbox.cvector.dev/api/metrics/?start_at=2025-07-14T10%3A00%3A00&end_at=2025-07-14T11%3A00%3A00

[baftinho]

LGTM

[joshuanapoli]

Thank you @baftinho for the more comprehensive test. This worked for me, tested in the scope of https://github.com/CVector-Energy/cvec-backend/pull/53