f/overrides/event-backup/edv-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
2025-12-18,0.811000
2026-04-01,0.764000
2008-03-25,0.684000
2009-09-24,0.877000
2020-12-23,6.105000
2023-04-03,0.674000
2025-07-01,0.808000
2008-09-24,0.885000
2010-12-22,1.268000
2017-09-27,0.822000
2022-04-01,0.635000
2023-10-02,0.737000
2008-06-24,0.820000
2014-06-23,0.878000
2021-04-01,0.646000
2022-07-01,0.706000
2018-09-24,0.840000
2018-12-13,0.825000
2023-12-22,0.737000
2025-10-01,0.798000
2009-03-25,0.943000
2011-12-21,3.619000
2012-09-24,0.932000
2016-03-21,0.696000
2009-12-22,12.281000
2017-03-22,0.702000
2021-12-23,0.684000
2011-03-25,0.800000
2013-12-20,2.232000
2014-03-24,0.769000
2021-10-01,0.706000
2011-06-24,0.889000
2016-09-20,0.869000
2018-03-16,0.792000
2022-10-03,0.682000
2023-07-03,0.726000
2013-06-24,0.877000
2014-09-22,0.853000
2016-12-14,3.435000
2021-07-01,0.700000
2019-03-21,0.820000
2010-06-24,0.898000
2010-09-24,0.898000
2012-06-25,0.873000
2015-03-23,0.749000
2008-12-22,1.425000
2016-06-21,0.822000
2017-12-26,1.159000
2022-12-23,0.691000
2025-04-01,0.794000
2010-03-25,0.804000
2011-09-23,0.934000
2012-03-26,0.804000
2015-06-22,0.905000
2020-10-01,0.704000
2024-04-01,0.769000
2024-07-01,0.776000
2026-07-01,0.867000
2012-12-20,6.134000
2015-12-17,2.273000
2017-06-28,0.850000
2019-12-23,2.110000
2013-03-22,0.772000
2018-06-18,0.838000
2019-06-21,0.793000
2024-10-01,0.770000
2009-06-24,1.144000
2013-09-23,0.586000
2024-12-24,0.838000
2019-09-26,0.833000
2020-07-01,0.798000
2015-09-21,0.878000
2020-04-01,0.838000