f/overrides/event-backup/dfesx-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
2014-12-16,0.073000
2017-09-28,0.127000
2022-12-12,0.127000
2021-03-30,0.011000
2012-09-10,0.077000
2013-06-10,0.086000
2019-06-27,0.079000
2020-09-29,0.115000
2011-06-08,0.047000
2014-06-09,0.063000
2014-09-09,0.112000
2023-12-11,0.171000
2025-03-28,0.028000
2025-06-27,0.120000
2009-03-10,0.012000
2009-09-09,0.047000
2010-06-08,0.083000
2022-09-29,0.159000
2013-09-10,0.083000
2016-03-30,0.030000
2018-06-28,0.059000
2022-06-29,0.092000
2020-12-14,0.043000
2024-03-27,0.018000
2015-09-09,0.102000
2016-06-29,0.080000
2019-09-27,0.171000
2020-06-29,0.081000
2024-06-27,0.092000
2007-03-08,0.030000
2010-09-08,0.059000
2017-03-30,0.005000
2023-09-28,0.140000
2013-12-12,0.076000
2023-03-30,0.031000
2011-12-13,0.073000
2016-09-29,0.065000
2026-06-29,0.123000
2013-03-08,0.006000
2016-12-15,0.052000
2018-09-27,0.137000
2026-03-30,0.028000
2008-09-09,0.099000
2009-06-09,0.072000
2009-12-09,0.049000
2010-03-09,0.005000
2023-06-29,0.109000
2020-03-30,0.019000
2007-06-08,0.102000
2007-09-10,0.076000
2008-06-10,0.110000
2010-12-09,0.702000
2025-12-10,0.181000
2011-09-08,0.146000
2015-06-08,0.063000
2015-12-16,0.053000
2022-03-30,0.022000
2019-12-16,0.081000
2021-06-29,0.101000
2021-09-29,0.147000
2025-09-29,0.175000
2007-12-19,1.145000
2012-06-08,0.036000
2017-06-29,0.079000
2018-12-18,0.098000
2008-12-10,0.050000
2024-09-27,0.146000
2024-12-10,0.202000
2008-03-10,0.016000
2012-12-13,0.406000
2017-12-15,0.092000
2021-12-13,0.120000