f/overrides/event-backup/nsbax-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
2014-03-31,0.131000
2018-09-28,0.154000
2023-12-28,0.164000
2025-12-15,4.978000
2006-12-28,0.374000
2007-09-28,0.097000
2010-12-30,0.106000
2025-06-30,0.154000
2008-03-31,0.073000
2013-12-13,0.192000
2021-03-31,0.163000
2020-03-31,0.155000
2020-12-30,0.125000
2010-03-31,0.091000
2010-09-30,0.104000
2018-12-28,0.110000
2019-03-29,0.155000
2019-06-28,0.147000
2024-09-30,0.133000
2007-12-28,0.145000
2013-12-30,0.133000
2014-12-30,0.119000
2015-03-31,0.126000
2016-06-30,0.119000
2017-06-30,0.132000
2017-09-29,0.151000
2019-12-16,3.108000
2008-12-30,0.065000
2009-03-31,0.139000
2012-09-28,0.114000
2025-09-30,0.127000
2019-12-30,0.213000
2020-09-30,0.151000
2022-03-31,0.132000
2015-09-30,0.131000
2016-12-29,0.146000
2021-11-09,1.388000
2026-03-31,0.139000
2013-03-28,0.111000
2014-09-30,0.126000
2015-06-30,0.129000
2010-06-30,0.091000
2011-09-30,0.111000
2012-12-28,0.215000
2020-12-15,1.516000
2021-06-30,0.144000
2024-12-30,0.140000
2026-06-30,0.113000
2006-12-15,0.007000
2009-06-30,0.045000
2015-12-30,0.141000
2025-12-30,0.155000
2011-06-30,0.093000
2015-12-15,1.420000
2024-06-28,0.154000
2017-12-28,0.123000
2022-09-30,0.148000
2023-12-15,0.933000
2026-05-14,1.535000
2007-12-14,0.131000
2012-06-29,0.129000
2013-06-28,0.123000
2011-12-29,0.131000
2013-09-30,0.126000
2016-09-30,0.139000
2007-06-29,0.072000
2008-06-30,0.121000
2009-09-30,0.087000
2019-09-30,0.167000
2021-09-30,0.159000
2022-12-29,0.728000
2023-09-29,0.150000
2024-03-28,0.136000
2011-03-31,0.095000
2014-12-15,1.065000
2017-03-31,0.145000
2020-06-30,0.136000
2022-12-15,0.565000
2023-06-30,0.152000
2024-12-16,3.468000
2012-03-30,0.117000
2017-12-15,1.229000
2018-08-22,1.680000
2018-03-29,0.129000
2018-06-29,0.161000
2022-06-30,0.126000
2023-03-31,0.146000
2025-03-31,0.143000
2008-09-30,0.087000
2014-06-30,0.135000
2016-03-31,0.139000
2018-12-17,0.296000
2007-03-30,0.096000
2009-12-30,0.092000
2021-12-30,0.097000