f/overrides/event-backup/hisix-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
2007-12-31,0.286000
2008-12-31,0.368000
2016-12-30,0.063000
2019-12-18,0.097000
2024-06-28,0.063000
2010-12-31,0.088000
2012-12-31,0.228000
2015-12-31,0.480000
2021-12-16,0.509000
2022-12-15,0.365000
2011-06-30,0.075000
2011-12-30,0.297000
2020-06-30,0.011000
2026-06-30,0.157000
2002-12-31,0.051000
2003-12-31,0.098000
2017-06-30,0.002000
2022-06-30,0.088000
2023-06-30,0.075000
2023-12-14,0.482000
2006-12-29,0.074000
2009-12-31,0.160000
2012-06-29,0.060000
2014-12-31,0.237000
2021-06-30,0.005000
2020-12-17,0.054000
2025-12-15,1.101000
2004-12-31,0.153000
2005-12-30,0.156000
2013-12-31,0.140000
2017-12-18,0.078000
2018-12-17,0.129000
2024-12-16,0.200000
2025-06-30,0.041000