fix: map renamed yfinance ticker BK -> BNY

[nikbpetrov]

https://www.bny.com/corporate/global/en/about-us/newsroom/press-release/bny-announces-planned-change-of-stock-ticker-symbol-to-bny-130465.html

Verified with:

python3 - <<'PY'
import json,urllib.request,datetime as dt
g=lambda s:json.load(urllib.request.urlopen(urllib.request.Request(
  f"https://query1.finance.yahoo.com/v8/finance/chart/{s}?range=6mo&interval=1d",
  headers={"User-Agent":"Mozilla/5.0"})))["chart"]["result"][0]
d=lambda t:dt.datetime.utcfromtimestamp(t).date()
for s in ("BK","BNY"):
    r=g(s); m=r["meta"]
    bars=[(d(t),c) for t,c in zip(r.get("timestamp") or [],
          r["indicators"]["quote"][0].get("close") or []) if c is not None]
    print(f"{s}: {len(bars)} bars {bars[0][0]}..{bars[-1][0]} | "
          f"last real trade {d(m['regularMarketTime'])} @ {m['regularMarketPrice']} | "
          f"firstTradeDate {d(m['firstTradeDate'])}")
PY

Output:

BK:  1 bars   2026-07-10..2026-07-10 | last real trade 2026-05-20 @ 137.16 | firstTradeDate 2026-07-10
BNY: 123 bars 2026-01-14..2026-07-13 | last real trade 2026-07-13 @ 151.27 | firstTradeDate 1973-05-03

Summary by CodeRabbit

• Bug Fixes

  • Updated ticker handling so the yfinance source recognizes BK as the previous ticker for BNY.

• Tests

  • Added coverage to verify the new ticker rename mapping.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 893d9954-d12d-41ae-ad3b-3501822da1ed

📥 Commits

Reviewing files that changed from the base of the PR and between 1956f7f and 4160dcd.

📒 Files selected for processing (2)

• src/sources/_metadata.py
• src/tests/test_yfinance.py

📝 Walkthrough

Walkthrough

The yfinance source metadata now maps ticker BK to BNY, and the corresponding test verifies that the rename is defined.

Changes

YFinance ticker rename

Layer / File(s)	Summary
Rename metadata and validation src/sources/_metadata.py, src/tests/test_yfinance.py	Adds the BK to BNY ticker mapping and tests that the mapping is present.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: mapping the renamed yfinance ticker BK to BNY.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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