f/overrides/event-backup/afjax-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
2012-09-20,0.029000
2013-03-21,0.005000
2013-12-19,0.114000
2019-03-21,0.026000
2020-06-18,0.113000
2011-09-22,0.107000
2018-03-22,0.041000
2020-12-17,0.129000
2009-03-19,0.080000
2011-03-17,0.079000
2021-06-17,0.062000
2005-09-22,0.033000
2006-03-23,0.026000
2006-09-21,0.088000
2007-03-22,0.062000
2007-06-21,0.170000
2022-03-17,0.006000
2007-12-20,0.540000
2009-06-18,0.138000
2018-12-20,0.080000
2010-09-16,0.077000
2017-09-21,0.098000
2020-09-17,0.166000
2018-09-20,0.021000
2022-09-22,0.067000
2024-06-20,0.062000
2011-12-22,0.070000
2019-06-20,0.178000
2021-09-16,0.199000
2024-12-19,0.254000
2025-06-18,0.043000
2006-12-21,0.020000
2024-09-19,0.103000
2026-06-18,0.052000
2015-12-17,0.091000
2016-12-22,0.102000
2023-12-21,0.162000
2008-09-18,0.210000
2009-09-17,0.053000
2010-12-16,0.033000
2012-03-22,0.035000
2014-06-19,0.171000
2011-06-16,0.218000
2012-12-20,0.075000
2014-12-18,0.060000
2015-09-17,0.234000
2007-12-13,1.045000
2008-06-19,0.201000
2009-12-17,0.028000
2012-06-21,0.223000
2025-09-18,0.436000
2006-12-14,0.274000
2015-06-18,0.189000
2019-09-19,0.151000
2022-12-22,0.247000
2023-09-21,0.114000
2019-12-19,0.105000
2020-03-19,0.023000
2021-12-16,0.174000
2005-06-23,0.097000
2006-06-22,0.116000
2010-03-18,0.042000
2014-09-18,0.275000
2017-06-22,0.158000
2022-06-16,0.024000
2026-03-19,0.053000
2008-03-20,0.030000
2013-09-19,0.123000
2015-03-19,0.049000
2016-06-16,0.187000
2025-12-18,0.804000
2005-12-16,0.039000
2010-06-17,0.171000
2018-06-21,0.191000
2023-06-22,0.021000
2007-09-20,0.060000
2008-12-11,0.523000
2013-06-20,0.173000
2016-09-22,0.157000
2017-03-16,0.028000