f/overrides/event-backup/aor-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
2008-12-26,0.169000
2012-06-26,0.235000
2014-04-02,0.141000
2012-09-26,0.135000
2018-04-03,0.160000
2020-10-02,0.162000
2025-10-02,0.268000
2009-12-28,0.191000
2017-12-28,1.391000
2025-12-23,0.669000
2012-03-27,0.085000
2013-07-02,0.260000
2019-12-24,0.403000
2023-07-05,0.386000
2022-04-04,0.150000
2023-10-03,0.222000
2013-04-02,0.135000
2016-10-04,0.140000
2018-10-02,0.186000
2021-07-02,0.275000
2024-04-02,0.221000
2024-10-02,0.270000
2023-12-22,0.524000
2017-07-06,0.320000
2019-07-02,0.423000
2020-04-02,0.186000
2009-09-24,0.125000
2013-10-02,0.140000
2014-12-26,0.231000
2015-12-29,0.010000
2009-03-26,0.062000
2019-10-02,0.198000
2026-04-02,0.309000
2014-07-02,0.318000
2015-07-02,0.330000
2021-12-23,0.407000
2023-04-04,0.199000
2025-04-02,0.248000
2026-07-02,0.522000
2017-04-04,0.153000
2017-10-03,0.161000
2020-12-24,0.334000
2021-10-04,0.138000
2010-09-27,0.108000
2015-12-28,0.209000
2024-07-02,0.424000
2013-12-27,0.206000
2016-07-06,0.312000
2022-07-05,0.353000
2022-12-23,0.318000
2024-12-20,0.608000
2025-07-02,0.470000
2009-06-25,0.221000
2010-12-27,0.199000
2015-10-02,0.130000
2018-12-28,0.311000
2020-07-02,0.304000
2021-04-05,0.114000
2022-10-04,0.180000
2010-03-26,0.077000
2012-12-26,0.252000
2015-04-02,0.144000
2019-04-02,0.201000
2011-12-27,0.223000
2014-10-02,0.156000
2016-12-28,0.274000
2018-07-03,0.371000
2010-06-25,0.197000
2011-03-28,0.110000
2011-06-27,0.260000
2011-09-27,0.159000