f/overrides/event-backup/fnx-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
2015-06-24,0.121000
2024-09-26,0.481000
2008-06-23,0.058000
2011-06-21,0.057000
2020-06-25,0.177000
2013-12-18,0.087000
2017-03-23,0.082000
2013-03-21,0.054000
2014-03-25,0.057000
2017-12-21,0.260000
2009-06-23,0.104000
2009-12-22,0.090000
2022-03-25,0.169000
2016-09-21,0.145000
2018-09-14,0.100000
2022-09-23,0.298000
2023-03-24,0.275000
2007-12-21,0.080000
2020-09-24,0.254000
2019-03-21,0.047000
2015-12-23,0.161000
2018-03-22,0.023000
2017-06-22,0.126000
2020-03-26,0.097000
2021-06-24,0.173000
2021-09-23,0.372000
2022-06-24,0.196000
2023-09-22,0.238000
2012-06-21,0.092000
2015-03-25,0.125000
2014-06-24,0.095000
2013-09-20,0.119000
2019-06-14,0.150000
2021-12-23,0.406000
2024-03-21,0.169000
2011-12-21,0.109000
2015-09-23,0.110000
2025-03-27,0.256000
2013-06-21,0.088000
2022-12-23,0.378000
2017-09-21,0.123000
2018-06-21,0.197000
2023-06-27,0.206000
2025-12-12,0.391000
2026-03-26,0.314000
2026-06-25,0.266000
2014-09-23,0.099000
2016-03-23,0.100000
2021-03-25,0.013000
2025-06-26,0.267000
2018-12-18,0.264000
2020-12-24,0.337000
2023-12-22,0.439000
2025-09-25,0.194000
2008-12-23,0.106000
2016-06-22,0.147000
2012-12-21,0.224000
2016-12-21,0.213000
2019-09-25,0.292000
2010-06-22,0.067000
2010-12-21,0.079000
2024-06-27,0.347000
2024-12-13,0.466000
2014-12-23,0.156000
2019-12-13,0.388000