f/overrides/event-backup/dipsx-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
2007-09-10,0.117000
2021-03-30,0.027000
2009-12-08,0.134000
2010-12-08,0.138000
2011-09-08,0.145000
2013-09-10,0.038000
2019-09-27,0.076000
2023-03-30,0.010000
2025-12-10,0.121000
2013-12-11,0.031000
2015-09-09,0.068000
2020-12-14,0.117000
2022-09-29,0.368000
2008-12-10,0.111000
2011-06-08,0.234000
2023-06-29,0.147000
2006-12-18,0.017000
2008-06-10,0.203000
2010-06-08,0.101000
2014-12-15,0.027000
2016-09-29,0.069000
2014-06-09,0.123000
2019-06-27,0.123000
2022-12-12,0.073000
2025-09-29,0.108000
2010-03-09,0.015000
2018-12-17,0.046000
2024-12-10,0.060000
2011-03-08,0.054000
2015-12-15,0.011000
2007-06-08,0.197000
2008-03-10,0.074000
2010-09-08,0.062000
2012-12-12,0.191000
2016-06-29,0.057000
2016-12-14,0.107000
2017-09-28,0.031000
2018-09-27,0.095000
2019-12-16,0.047000
2024-09-27,0.081000
2007-12-19,0.099000
2018-06-28,0.118000
2020-09-29,0.062000
2021-06-29,0.213000
2023-09-28,0.131000
2024-06-27,0.150000
2011-12-12,0.253000
2023-12-11,0.117000
2012-06-08,0.148000
2017-12-14,0.154000
2022-03-30,0.124000
2022-06-29,0.317000
2008-09-09,0.230000
2025-03-28,0.042000
2025-06-27,0.133000
2013-06-10,0.088000
2017-06-29,0.090000
2020-03-30,0.031000
2007-03-08,0.005000
2014-09-09,0.099000
2017-03-30,0.035000
2021-09-29,0.259000
2021-12-13,0.150000
2026-06-29,0.204000