f/overrides/event-backup/aacrx-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
2010-06-15,0.012000
2012-03-13,0.003000
2013-12-17,0.369000
2014-06-10,0.006000
2018-12-18,0.290000
2024-12-20,0.289000
2006-09-29,0.032000
2011-03-22,0.013000
2018-12-20,0.026000
2024-06-25,0.025000
2007-12-28,0.034000
2012-12-18,0.190000
2014-12-23,0.005000
2017-12-19,0.284000
2016-06-21,0.006000
2019-03-19,0.004000
2019-06-18,0.021000
2022-03-29,0.019000
2009-03-17,0.014000
2012-03-06,0.002000
2013-09-10,0.007000
2016-12-20,0.089000
2017-06-20,0.010000
2017-09-19,0.012000
2018-09-18,0.020000
2006-12-19,0.145000
2006-12-27,0.040000
2010-09-21,0.017000
2022-09-27,0.010000
2023-03-28,0.006000
2023-12-21,0.042000
2019-12-20,0.403000
2023-09-26,0.018000
2024-09-24,0.039000
2011-12-20,0.098000
2015-03-17,0.001000
2016-09-20,0.004000
2021-12-28,0.442000
2025-09-25,0.011000
2008-03-11,0.008000
2008-12-29,0.015000
2024-03-26,0.004000
2026-06-11,0.040000
2023-06-27,0.041000
2008-09-16,0.028000
2011-09-20,0.017000
2012-12-26,0.021000
2018-06-19,0.020000
2020-06-23,0.001000
2022-06-28,0.030000
2022-12-28,0.155000
2007-03-13,0.020000
2008-06-17,0.029000
2009-06-16,0.023000
2010-03-23,0.018000
2013-12-23,0.012000
2014-09-09,0.008000
2014-12-16,0.343000
2011-12-27,0.019000
2013-06-11,0.016000
2021-06-29,0.025000
2007-06-12,0.035000
2013-03-19,0.015000
2018-12-31,0.026000
2025-03-27,0.016000
2025-12-19,0.223000
2009-12-29,0.014000
2010-12-28,0.016000
2011-06-14,0.023000
2012-09-18,0.008000
2016-12-27,0.026000
2007-09-11,0.032000
2015-12-22,0.317000
2021-09-28,0.031000
2025-06-26,0.030000
2020-09-29,0.008000
2007-03-06,0.023000
2007-12-18,0.366000
2008-03-18,0.033000
2009-09-15,0.022000
2012-06-12,0.024000
2017-12-26,0.022000
2019-09-17,0.018000
2020-12-29,0.199000