f/overrides/event-backup/ixn-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
2004-12-23,0.105167
2009-12-21,0.023333
2011-12-19,0.055667
2017-12-21,0.135833
2025-06-16,0.164000
2006-12-21,0.021500
2008-06-23,0.035500
2009-06-22,0.033500
2011-06-21,0.040833
2013-12-17,0.076333
2018-12-18,0.135333
2022-12-13,0.187000
2024-06-11,0.160000
2021-12-30,0.008000
2007-12-24,0.038833
2008-12-22,0.037833
2015-12-21,0.092833
2016-06-21,0.108667
2018-06-19,0.091000
2019-12-16,0.191833
2020-12-14,0.153667
2025-12-16,0.929000
2024-12-17,0.201000
2026-06-15,0.167000
2005-12-23,0.004167
2010-12-20,0.036833
2021-12-13,0.159000
2017-06-20,0.102500
2010-06-21,0.031667
2012-12-17,0.082500
2013-06-25,0.065167
2014-06-24,0.085833
2014-12-19,0.094833
2015-06-24,0.089833
2016-12-22,0.080667
2019-06-17,0.180500
2022-06-09,0.175000
2023-12-20,0.212000
2012-06-20,0.038500
2020-06-15,0.160333
2021-06-10,0.204667
2023-06-07,0.166000