f/overrides/event-backup/lciax-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
2014-07-03,0.817000
2014-10-03,0.783000
2015-04-02,0.778000
2016-12-15,2.049000
2017-12-28,1.491000
2019-04-09,0.878000
2008-10-03,0.532000
2009-03-30,0.504000
2025-10-06,0.656000
2023-12-15,21.060000
2024-12-30,0.759000
2017-10-05,0.958000
2007-10-02,0.620000
2015-12-11,6.628000
2018-12-14,27.105000
2020-12-11,2.463000
2021-12-16,18.634000
2022-12-29,0.706000
2023-10-05,0.723000
2025-12-18,28.210000
2009-07-06,0.413000
2016-07-07,0.644000
2022-12-16,24.143000
2024-04-05,0.696000
2026-07-07,0.616000
2015-07-08,0.706000
2022-07-07,0.692000
2020-07-07,0.659000
2008-12-30,0.498000
2023-07-06,0.637000
2014-12-30,0.850000
2018-04-06,0.865000
2025-12-30,0.599000
2007-12-27,0.751000
2009-12-30,0.603000
2019-12-13,29.361000
2020-10-06,0.666000
2024-12-18,26.200000
2025-04-04,0.615000
2026-04-07,0.617000
2008-03-28,0.554000
2016-12-29,0.908000
2019-07-09,0.878000
2025-07-08,0.717000
2017-12-14,4.467000
2018-10-04,1.040000
2020-04-07,0.802000
2021-04-06,0.804000
2023-04-05,0.731000
2008-07-03,0.597000
2016-04-07,0.925000
2019-12-30,0.739000
2022-04-06,0.784000
2024-07-09,0.696000
2015-10-05,0.831000
2018-12-28,1.186000
2018-07-09,1.164000
2021-07-07,0.745000
2021-12-30,0.776000
2024-10-07,0.739000
2014-12-10,10.395000
2017-07-07,0.811000
2020-12-30,0.824000
2023-12-28,0.642000
2016-10-06,0.829000
2017-04-07,0.452000
2019-10-08,0.925000
2021-10-05,0.825000
2022-10-06,0.810000
2009-10-05,0.433000
2015-12-30,0.863000