f/overrides/event-backup/ita-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
2010-09-23,0.085500
2011-12-22,0.105000
2012-03-26,0.086000
2013-09-24,0.220500
2015-12-24,0.112500
2016-03-23,0.158500
2017-12-19,0.160500
2006-06-22,0.018500
2011-03-25,0.067500
2023-03-23,0.280000
2007-03-23,0.023000
2007-06-28,0.026500
2007-09-25,0.028500
2008-03-25,0.041000
2008-09-24,0.057500
2012-09-25,0.115500
2009-09-22,0.060000
2013-03-25,0.118500
2016-06-21,0.157000
2017-09-26,0.354000
2021-03-25,0.315000
2022-03-24,0.160000
2022-09-26,0.382000
2006-12-20,0.035000
2013-12-23,0.150000
2021-12-13,0.158000
2024-06-11,0.299000
2017-03-24,0.157000
2018-12-17,0.114500
2021-06-10,0.189000
2019-12-30,0.287500
2009-03-25,0.056000
2012-06-19,0.117000
2014-03-25,0.105000
2014-09-24,0.126000
2014-12-24,0.126500
2015-09-25,0.127000
2018-06-26,0.217000
2020-03-25,0.393500
2020-06-15,0.209000
2022-06-09,0.278000
2025-06-16,0.172000
2009-06-24,0.073000
2019-03-20,0.292000
2023-06-07,0.237000
2007-12-27,0.051000
2010-12-22,0.079000
2012-12-19,0.375500
2014-06-24,0.333500
2016-09-26,0.179000
2025-03-18,0.253000
2006-09-26,0.028500
2019-06-17,0.307000
2019-09-24,0.292500
2021-09-24,0.181000
2023-12-20,0.433000
2024-03-21,0.266000
2010-06-24,0.063500
2018-03-22,0.209000
2022-12-13,0.240000
2023-09-26,0.225000
2008-06-25,0.040500
2015-03-25,0.253500
2019-12-16,0.528500
2020-12-14,0.203000
2025-09-16,0.750000
2009-12-23,0.146500
2011-06-24,0.084000
2011-09-23,0.079500
2013-06-26,0.110000
2018-09-26,0.434500
2020-09-23,0.204000
2026-06-15,0.164000
2008-12-23,0.092000
2026-03-17,0.151000
2016-12-21,0.260000
2017-06-27,0.188500
2024-09-25,0.227000
2010-03-25,0.036500
2015-06-24,0.120500
2024-12-17,0.437000