f/overrides/event-backup/deqax-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
2011-12-16,0.267000
2013-06-28,0.120000
2014-09-30,0.089000
2016-12-16,0.461000
2015-03-31,0.068000
2016-03-31,0.043000
2017-12-28,0.022000
2022-03-31,0.043000
2023-03-31,0.058000
2010-09-30,0.025000
2018-09-28,0.031000
2014-03-31,0.143000
2014-06-30,0.138000
2014-12-16,0.211000
2017-09-29,0.044000
2018-12-14,0.933000
2019-12-16,0.214000
2020-09-30,0.040000
2021-09-30,0.036000
2012-06-29,0.102000
2013-12-17,0.055000
2017-03-31,0.044000
2025-06-30,0.148000
2026-06-30,0.092000
2010-03-31,0.022000
2012-09-28,0.054000
2017-06-30,0.098000
2018-06-29,0.135000
2023-12-15,0.815000
2025-09-30,0.055000
2026-03-31,0.066000
2009-06-30,0.011000
2011-09-30,0.023000
2019-03-29,0.047000
2023-09-29,0.060000
2010-06-30,0.041000
2010-12-29,0.210000
2012-12-18,0.164000
2015-06-30,0.111000
2016-06-30,0.090000
2008-03-31,0.069000
2009-03-31,0.019000
2015-09-30,0.057000
2015-12-15,0.635000
2016-09-30,0.035000
2020-06-30,0.082000
2021-12-16,1.561000
2022-09-30,0.030000
2023-06-30,0.135000
2024-09-30,0.059000
2025-03-31,0.050000
2008-09-30,0.108000
2008-12-24,0.202000
2009-09-30,0.049000
2011-03-31,0.015000
2011-06-30,0.032000
2019-09-30,0.031000
2020-03-31,0.055000
2020-12-16,0.065000
2021-03-31,0.073000
2009-12-29,0.200000
2012-03-30,0.027000
2013-09-30,0.080000
2021-06-30,0.097000
2022-06-30,0.115000
2025-12-16,1.431000
2022-12-15,1.504000
2024-06-28,0.129000
2017-12-15,0.408000
2018-03-29,0.043000
2024-03-28,0.060000
2024-12-16,1.171000
2008-06-30,0.150000
2013-03-28,0.059000
2019-06-28,0.138000