f/overrides/event-backup/fem-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
2015-12-23,0.038000
2017-03-23,0.056000
2021-09-23,0.554000
2023-09-22,0.461000
2018-12-18,0.068000
2026-03-26,0.033000
2014-06-24,0.228000
2015-06-24,0.223000
2021-12-23,0.223000
2013-03-21,0.059000
2013-06-21,0.403000
2014-09-23,0.321000
2019-12-13,0.089000
2022-03-25,0.014000
2012-06-21,0.386000
2013-09-20,0.145000
2016-12-21,0.005000
2017-06-22,0.178000
2023-03-24,0.043000
2024-12-13,0.145000
2014-12-23,0.065000
2018-09-14,0.422000
2011-06-21,0.054000
2013-12-18,0.043000
2019-06-14,0.327000
2020-06-25,0.195000
2023-12-22,0.090000
2025-06-26,0.324000
2017-09-21,0.242000
2020-03-26,0.031000
2015-09-23,0.389000
2018-03-22,0.016000
2019-03-21,0.018000
2019-09-25,0.443000
2021-03-25,0.031000
2017-12-21,0.208000
2020-09-24,0.451000
2025-09-25,0.283000
2025-12-12,0.209000
2012-12-21,0.032000
2022-12-23,0.204000
2011-12-21,0.151000
2016-09-21,0.266000
2021-06-24,0.275000
2022-09-23,0.536000
2012-09-21,0.166000
2024-03-21,0.095000
2024-06-27,0.241000
2025-03-27,0.039000
2026-06-25,0.190000
2016-06-22,0.187000
2018-06-21,0.298000
2022-06-24,0.541000
2023-06-27,0.505000
2024-09-26,0.325000