f/overrides/event-backup/irsyx-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
2004-12-16,0.866000
2005-09-15,0.053000
2013-06-13,0.092000
2025-09-22,0.076000
2015-06-11,0.058000
2017-12-14,3.036000
2019-12-12,2.172000
2005-12-15,0.868000
2010-03-11,0.065000
2011-12-08,0.092000
2015-09-10,0.042000
2012-09-13,0.040000
2020-03-12,0.017000
2025-06-20,0.095000
2026-06-22,0.077000
2017-06-15,0.023000
2004-03-11,0.020000
2007-09-13,0.036000
2008-09-11,0.060000
2009-09-10,0.052000
2010-09-16,0.035000
2012-12-13,0.107000
2015-03-12,0.029000
2018-03-15,0.028000
2021-09-16,0.049000
2022-09-15,0.177000
2005-03-10,0.012000
2008-06-12,0.070000
2009-12-10,0.093000
2010-06-10,0.057000
2012-03-15,0.033000
2017-09-14,0.051000
2006-12-14,1.035000
2007-12-13,2.028000
2014-09-11,0.035000
2021-12-16,3.717000
2023-03-22,0.105000
2004-06-17,0.037000
2018-12-13,1.466000
2020-06-11,0.064000
2024-03-22,0.289000
2006-09-14,0.053000
2007-03-15,0.025000
2012-06-14,0.039000
2013-09-12,0.056000
2018-09-13,0.069000
2019-06-13,0.071000
2023-09-22,0.110000
2008-03-13,0.063000
2025-03-21,0.080000
2006-03-16,0.046000
2006-06-15,0.054000
2010-04-29,0.022000
2013-03-14,0.026000
2020-09-10,0.053000
2023-06-22,0.104000
2023-12-15,1.229000
2004-09-16,0.058000
2019-03-14,0.037000
2025-12-12,2.817000
2009-06-11,0.074000
2016-12-08,2.483000
2024-06-21,0.096000
2009-03-12,0.079000
2014-06-12,0.056000
2014-12-11,0.992000
2020-12-10,0.311000
2024-09-20,0.074000
2003-12-18,0.172000
2008-12-11,0.138000
2010-12-09,0.136000
2013-12-12,0.130000
2015-12-10,1.542000
2019-09-12,0.086000
2022-12-15,5.316000
2024-12-13,2.002000
2026-03-20,0.073000
2005-06-16,0.064000
2007-06-14,0.031000
2016-03-10,0.048000
2016-06-16,0.135000
2016-09-15,0.054000
2018-06-14,0.075000