f/overrides/event-backup/fan-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
2015-09-23,0.038000
2010-06-22,0.092000
2020-09-24,0.034000
2021-03-25,0.052000
2009-06-23,0.055000
2025-03-27,0.021000
2021-12-23,0.056000
2017-09-21,0.055000
2021-09-23,0.143000
2022-09-23,0.087000
2025-09-25,0.093000
2015-12-23,0.067000
2013-03-21,0.005000
2014-03-25,0.028000
2016-06-22,0.050000
2022-03-25,0.033000
2023-03-24,0.041000
2025-12-12,0.055000
2009-12-22,0.267000
2020-12-24,0.027000
2022-12-23,0.044000
2023-09-22,0.079000
2019-12-13,0.103000
2018-12-18,0.057000
2017-03-23,0.047000
2014-09-23,0.028000
2015-06-24,0.144000
2017-06-22,0.241000
2019-06-14,0.102000
2021-06-24,0.113000
2013-06-21,0.040000
2013-09-20,0.017000
2015-03-25,0.019000
2016-12-21,0.559000
2020-06-25,0.093000
2023-12-22,0.038000
2025-06-26,0.107000
2008-12-23,0.041000
2012-09-21,0.088000
2012-12-21,0.025000
2016-03-23,0.050000
2011-06-21,0.058000
2024-03-21,0.026000
2024-06-27,0.127000
2026-06-25,0.087000
2018-09-14,0.063000
2014-12-23,0.146000
2018-06-21,0.147000
2019-03-21,0.092000
2019-09-25,0.057000
2023-06-27,0.125000
2024-09-26,0.047000
2024-12-13,0.025000
2013-12-18,0.019000
2016-09-21,0.048000
2018-03-22,0.040000
2020-03-26,0.040000
2022-06-24,0.096000
2014-06-24,0.063000