f/overrides/event-backup/alaax-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
2022-09-22,0.030000
2024-10-17,0.039000
2025-11-20,0.040000
2015-02-19,0.030000
2021-04-15,0.032000
2026-04-16,0.039000
2015-12-16,0.080000
2025-08-21,0.040000
2018-01-18,0.032000
2020-03-19,0.041000
2020-12-21,0.060000
2023-04-20,0.028000
2017-02-16,0.034000
2017-06-15,0.032000
2022-06-23,0.030000
2023-10-19,0.028000
2024-08-15,0.039000
2018-07-19,0.036000
2019-03-21,0.041000
2016-03-17,0.030000
2019-01-17,0.041000
2023-05-18,0.028000
2013-09-19,0.029000
2014-03-20,0.029000
2011-12-16,0.089000
2014-09-18,0.030000
2016-10-21,0.030000
2018-02-15,0.032000
2020-02-20,0.041000
2022-01-20,0.032000
2008-12-16,0.166000
2010-12-17,0.109000
2018-06-21,0.035000
2020-07-16,0.035000
2021-02-18,0.032000
2023-11-16,0.030000
2025-10-16,0.040000
2015-04-16,0.030000
2017-07-20,0.032000
2016-09-15,0.030000
2020-06-18,0.035000
2009-09-25,0.095000
2016-06-16,0.030000
2014-11-20,0.030000
2015-10-15,0.030000
2019-04-18,0.041000
2019-07-18,0.041000
2019-10-17,0.041000
2021-11-18,0.032000
2010-06-24,0.089000
2011-06-23,0.089000
2024-01-18,0.030000
2022-02-17,0.030000
2023-09-28,0.028000
2018-12-20,0.039000
2019-08-15,0.041000
2024-09-26,0.039000
2016-12-19,0.085000
2017-05-18,0.034000
2017-04-20,0.034000
2019-11-21,0.041000
2022-04-21,0.030000
2024-11-21,0.039000
2026-06-25,0.040000
2009-12-17,0.099000
2012-03-22,0.089000
2012-12-14,0.093000
2019-02-21,0.041000
2019-09-19,0.041000
2021-12-21,0.032000
2023-02-16,0.028000
2007-06-22,0.162000
2008-09-26,0.154000
2025-02-20,0.040000
2017-08-17,0.032000
2019-05-16,0.041000
2025-04-17,0.040000
2025-05-15,0.040000
2007-03-22,0.088000
2013-08-15,0.029000
2016-01-21,0.030000
2017-11-16,0.064000
2022-05-19,0.030000
2024-03-28,0.030000
2024-06-27,0.030000
2013-10-17,0.029000
2014-10-16,0.030000
2015-03-19,0.030000
2015-11-19,0.030000
2017-01-19,0.034000
2018-09-13,0.038000
2026-07-16,0.040000
2010-09-23,0.089000
2014-06-19,0.029000
2013-07-18,0.029000
2006-03-22,0.076000
2007-12-18,0.256000
2018-08-16,0.038000
2021-09-23,0.032000
2026-03-26,0.039000
2005-12-20,0.145000
2014-12-17,0.081000
2017-09-14,0.032000
2020-05-21,0.041000
2020-09-17,0.032000
2022-08-18,0.030000
2024-07-18,0.039000
2008-06-25,0.318000
2015-09-17,0.030000
2013-11-21,0.029000
2017-12-19,0.032000
2023-03-23,0.028000
2023-07-20,0.028000
2006-09-22,0.098000
2010-03-25,0.099000
2026-05-21,0.040000
2013-03-28,0.093000
2018-05-17,0.032000
2025-03-27,0.040000
2017-10-19,0.032000
2022-12-21,0.030000
2016-07-21,0.030000
2022-10-20,0.030000
2022-11-17,0.030000
2013-06-27,0.093000
2016-04-21,0.030000
2020-08-20,0.032000
2024-12-19,0.059000
2014-07-17,0.029000
2018-03-22,0.032000
2016-11-17,0.030000
2021-03-25,0.032000
2021-10-21,0.032000
2023-06-22,0.028000
2006-06-22,0.091000
2011-09-21,0.089000
2014-04-17,0.029000
2015-07-16,0.030000
2016-02-18,0.030000
2018-04-19,0.032000
2021-07-15,0.032000
2024-04-18,0.030000
2006-12-19,0.148000
2014-02-20,0.029000
2026-01-15,0.040000
2026-02-19,0.039000
2025-07-17,0.040000
2025-09-25,0.040000
2015-06-18,0.030000
2021-06-24,0.032000
2015-05-21,0.030000
2015-08-20,0.030000
2017-03-16,0.034000
2019-06-20,0.041000
2023-08-17,0.028000
2025-01-16,0.039000
2012-06-21,0.089000
2012-09-27,0.093000
2025-12-18,0.040000
2014-01-16,0.029000
2016-05-19,0.030000
2018-11-15,0.038000
2020-01-16,0.041000
2020-11-19,0.032000
2023-01-19,0.028000
2008-03-25,0.113000
2013-12-18,0.029000
2015-01-22,0.030000
2016-08-18,0.030000
2019-12-20,0.316000
2020-10-15,0.032000
2021-01-21,0.032000
2021-05-20,0.032000
2009-06-25,0.107000
2014-05-15,0.029000
2024-02-15,0.030000
2025-06-26,0.040000
2020-04-16,0.041000
2021-08-19,0.032000
2022-03-24,0.030000
2023-12-20,0.109000
2009-03-25,0.110000
2014-08-21,0.030000
2018-10-18,0.038000
2022-07-21,0.030000
2024-05-16,0.030000
2007-09-25,0.111000
2011-03-24,0.089000