f/overrides/event-backup/jmyax-dividend.csv
Greg Pomerantz bb8e39605e Event-history protection: backup dir, empty-download fallback, docs
Yahoo's 2026 event-feed change (capitalGain events dropped for some
funds; no events at all for terminated tickers) can wipe good event
history on re-download. Defense in depth:

- overrides/event-backup/: last-known-good copy of every dividend/
  capitalGain file (8,192 files, 58 MB); refresh with
  scripts/backup_events.py after each dump update
- data.py event_file(): frozen > data-root (while populated) > backup;
  used by panel reads, verify_official, and the double-listing scanner
- README: capital-gain files are mutual-fund-only in this dump; Yahoo
  has no LT/ST split (tax.py taxes capg at lt_rate; the per-fund split
  would come from fund-company annual tax statements or commercial feeds)
- tests: exact Timestamp .loc keys (pandas 3.x string matching returns a
  Series on large DatetimeIndex)
2026-08-31 21:59:25 -04:00

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Date,Dividends
2015-09-30,0.068000
2016-06-30,0.134000
2018-03-29,0.067000
2019-09-30,0.089000
2021-06-30,0.157000
2018-09-28,0.088000
2019-06-28,0.195000
2019-12-16,0.054000
2013-09-30,0.056000
2013-12-18,0.054000
2013-12-31,0.143000
2014-09-30,0.070000
2014-12-17,0.044000
2019-12-31,0.201000
2020-09-30,0.108000
2022-12-30,0.536000
2025-12-31,0.962000
2020-06-30,0.064000
2012-12-31,0.135000
2013-03-28,0.061000
2017-06-30,0.138000
2017-12-29,0.219000
2019-03-29,0.062000
2021-03-31,0.081000
2015-12-31,0.171000
2016-09-30,0.075000
2018-06-29,0.186000
2020-03-31,0.065000
2020-12-31,0.161000
2014-03-31,0.059000
2024-12-31,0.754000
2014-06-30,0.144000
2017-03-31,0.061000
2018-12-14,0.679000
2018-12-31,0.193000
2023-12-29,0.653000
2016-12-30,0.184000
2017-09-29,0.090000
2021-09-30,0.091000
2013-06-28,0.051000
2015-03-31,0.059000
2015-06-30,0.126000
2015-12-18,0.013000
2016-03-31,0.061000
2021-12-15,0.891000
2021-12-31,0.416000
2012-09-28,0.115000
2014-12-31,0.145000