f/overrides/event-backup/iak-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
2016-06-21,0.216000
2019-12-16,0.314000
2025-03-18,0.775000
2008-09-24,0.137000
2012-09-25,0.108000
2015-09-25,0.219000
2018-03-22,0.459000
2020-09-23,0.360000
2007-03-23,0.078000
2007-12-27,0.191000
2014-09-24,0.171000
2012-06-19,0.076000
2013-12-23,0.158000
2016-03-23,0.263000
2018-12-17,0.325000
2007-09-25,0.217000
2009-09-22,0.082000
2010-03-25,0.080000
2014-03-25,0.223000
2017-09-26,0.281000
2020-03-25,0.506000
2006-09-26,0.112000
2007-06-28,0.106000
2013-06-26,0.121000
2016-09-26,0.237000
2017-12-19,0.323000
2021-03-25,0.582000
2021-09-24,0.499000
2024-03-21,0.411000
2009-03-25,0.089000
2013-09-24,0.136000
2015-12-24,0.254000
2020-06-15,0.219000
2023-06-07,0.239000
2024-06-11,0.224000
2018-09-26,0.258000
2019-03-20,0.361000
2019-06-17,0.283000
2012-12-19,0.299000
2015-06-24,0.159000
2017-06-27,0.241000
2018-06-26,0.300000
2023-09-26,0.491000
2006-06-22,0.076000
2008-06-25,0.124000
2009-12-23,0.189000
2024-09-25,0.522000
2022-03-24,0.324000
2009-06-24,0.067000
2010-12-22,0.419000
2017-03-24,0.231000
2016-12-21,0.279000
2006-12-20,0.156000
2010-09-23,0.092000
2011-12-22,0.281000
2020-12-14,0.309000
2025-12-16,0.667000
2010-06-24,0.060000
2013-03-25,0.123000
2014-06-24,0.162000
2022-12-13,0.500000
2023-12-20,0.433000
2024-12-17,0.731000
2026-03-17,1.996000
2026-06-15,0.394000
2011-06-24,0.074000
2021-12-13,0.395000
2022-09-26,0.465000
2008-03-25,0.125000
2011-09-23,0.076000
2025-09-16,0.512000
2019-09-24,0.354000
2021-06-10,0.297000
2012-03-26,0.091000
2014-12-24,0.230000
2015-03-25,0.198000
2023-03-23,0.277000
2025-06-16,0.351000
2008-12-23,0.200000
2021-12-30,0.118000
2022-06-09,0.260000