f/overrides/event-backup/archx-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
2016-06-28,0.038000
2020-12-30,0.040000
2021-03-30,0.038000
2024-03-27,0.057000
2024-06-27,0.058000
2025-12-29,0.419000
2018-06-28,0.042000
2023-03-30,0.056000
2015-12-29,0.045000
2023-09-28,0.051000
2005-12-28,0.071000
2009-12-23,0.201000
2013-12-27,0.162000
2014-03-31,0.052000
2015-09-29,0.040000
2025-09-29,0.064000
2026-06-29,0.062000
2015-06-29,0.043000
2018-09-27,0.046000
2021-12-30,0.192000
2017-06-29,0.060000
2017-09-28,0.039000
2017-12-28,0.266000
2019-06-27,0.059000
2019-09-27,0.051000
2011-12-28,0.214000
2012-12-28,0.249000
2016-12-29,0.130000
2019-12-30,0.092000
2020-06-29,0.056000
2024-12-30,0.565000
2020-09-29,0.045000
2021-06-29,0.045000
2022-03-30,0.039000
2023-06-29,0.050000
2016-09-28,0.041000
2017-03-30,0.041000
2018-03-28,0.042000
2015-03-30,0.030000
2022-09-29,0.042000
2024-09-27,0.059000
2026-03-30,0.060000
2006-12-27,0.517000
2014-09-30,0.065000
2020-03-30,0.052000
2010-12-28,0.182000
2022-06-29,0.047000
2022-12-29,0.346000
2021-09-29,0.034000
2007-12-21,0.494000
2014-12-30,0.035000
2019-03-28,0.052000
2014-06-30,0.038000
2018-12-28,0.123000
2025-06-27,0.074000
2008-12-22,0.278000
2016-03-29,0.041000
2023-12-28,0.058000
2025-03-28,0.059000