# Changelog of Yahoo Finance Quote Scraper (`devilscrapes/yahoo-finance-quote-scraper`) Actor

- **URL**: https://apify.com/devilscrapes/yahoo-finance-quote-scraper/changelog.md
- **Full Actor documentation**: https://apify.com/devilscrapes/yahoo-finance-quote-scraper.md

## Yahoo Finance Quote Scraper — Changelog

### 0.1.1 — 2026-09-12

- **Fix: `previous_close` was empty on every single row in production**
  (30-day field-fill audit, run `gDqSDDtW3424IRvjX`). Root cause: the parser
  read `meta.previousClose`, but a live probe against
  `query1.finance.yahoo.com/v8/finance/chart/{symbol}` on 2026-09-12 showed
  Yahoo only populates that key when the request's `range=1d`. For every
  other range — including `1mo`, this Actor's default — the key is simply
  absent from the response. `meta.chartPreviousClose` looked like an obvious
  substitute but is a different number entirely: the reference price from
  *before the requested chart window* (e.g. ~1 month old for `range=1mo`,
  \~1 year old for `range=1y`), not yesterday's close.
- The fix does **not** cost an extra request. When the interval is daily,
  the true previous session close is already sitting in the same response —
  it's the second-to-last close in the candle series that was fetched
  anyway. Verified this equals the direct `meta.previousClose` value exactly
  when both are available (`range=1d`). For non-daily intervals (`1wk`,
  `1mo`) there is no way to recover a genuine daily previous-close from that
  response, so the field now returns `null` honestly instead of guessing —
  same behaviour as before for that narrower case, just no longer silently
  wrong for the common daily case.
- Added 3 regression tests (`tests/test_parser.py`) against realistic
  Yahoo response shapes (no `meta.previousClose`, only `chartPreviousClose`)
  that fail against the pre-fix parser and pass against the fix.
- Checked the other 13 dataset fields against a fresh local run
  (AAPL/^GSPC/BTC-USD, default `range=1mo`/`interval=1d`) and against six
  live symbol classes (equity, index, ETF, crypto, FX) — all populated with
  no unexpected nulls at the default configuration.

### 0.1.0 — 2026-09-10

- Initial local-green build: real per-symbol quote + OHLCV candle
  fetch against `query1.finance.yahoo.com/v8/finance/chart/{symbol}`
  via `curl-cffi` browser impersonation (rotating
  `chrome131`/`chrome124`/`firefox147`/`safari180`), exponential
  backoff on 408/429/5xx/network errors (2s→30s, max 5 attempts),
  immediate fail on 404.
- Per-symbol fault isolation: one bad/delisted ticker is logged and
  skipped, the rest of the run continues; the run fails loud only if
  every requested symbol fails.
- One dataset row per symbol (snapshot fields + nested `candles` list),
  never one row per candle. `result` PPE event fires once per row.
- 45 unit tests across `models`/`parser`/`client`/`main` against
  synthetic fixtures (equity, index, empty-candles, `chart.error`,
  malformed body); `ruff`/`pyright` clean.