f/overrides/event-backup/dsi-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
2010-06-24,0.067000
2012-12-19,0.160000
2015-03-25,0.121500
2025-09-16,0.284000
2010-09-23,0.094500
2015-06-24,0.124000
2018-12-17,0.217500
2022-12-13,0.297000
2025-06-16,0.263000
2010-12-22,0.091000
2009-06-24,0.066500
2012-03-26,0.087000
2014-09-24,0.120500
2026-03-17,0.310000
2008-09-24,0.081000
2016-12-21,0.190500
2019-09-24,0.214500
2023-09-26,0.316000
2015-09-25,0.138500
2009-09-22,0.064000
2014-06-24,0.110500
2014-12-24,0.147500
2016-06-21,0.131500
2024-12-17,0.323000
2007-06-28,0.073000
2007-09-25,0.074500
2013-09-24,0.118000
2017-03-24,0.138500
2026-06-15,0.282000
2006-12-20,0.052500
2009-12-23,0.077500
2013-03-25,0.093000
2016-09-26,0.131500
2018-09-26,0.191000
2023-06-07,0.188000
2023-12-20,0.313000
2025-03-18,0.275000
2008-03-25,0.077500
2020-03-25,0.259000
2018-03-22,0.138000
2010-03-25,0.059500
2015-12-24,0.169000
2019-03-20,0.216000
2021-03-25,0.222000
2022-03-24,0.215000
2008-12-23,0.086500
2013-12-23,0.125500
2020-06-15,0.174500
2021-09-24,0.255000
2009-03-25,0.081000
2017-09-26,0.173000
2020-12-14,0.217000
2011-09-23,0.087000
2007-12-27,0.076500
2021-12-13,0.269000
2024-03-21,0.247000
2025-12-16,0.359000
2007-03-23,0.087500
2012-09-25,0.108000
2013-06-26,0.101500
2014-03-25,0.103500
2018-06-26,0.211500
2022-06-09,0.183000
2022-09-26,0.302000
2023-03-23,0.263000
2008-06-25,0.080500
2024-09-25,0.347000
2024-06-11,0.216000
2017-06-27,0.133500
2019-06-17,0.183500
2019-12-16,0.228500
2020-09-23,0.222500
2011-12-22,0.109500
2011-06-24,0.080000
2012-06-19,0.096000
2017-12-19,0.182500
2021-06-10,0.172000
2011-03-25,0.067000