f/overrides/event-backup/mxiux-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
2023-03-27,0.080000
2023-12-27,0.282000
2016-09-07,0.040000
2018-12-27,0.059000
2019-06-24,0.081000
2021-03-24,0.041000
2022-09-27,0.076000
2015-12-29,0.054000
2019-03-25,0.061000
2020-09-25,0.049000
2021-06-23,0.035000
2021-12-29,0.261000
2019-09-25,0.076000
2021-09-24,0.035000
2023-09-06,0.004000
2015-09-21,0.086000
2016-09-23,0.074000
2017-09-22,0.071000
2017-12-27,0.042000
2018-03-23,0.064000
2016-12-28,0.038000
2023-09-26,0.046000
2025-09-05,0.012000
2018-09-07,0.036000
2020-03-25,0.074000
2022-03-25,0.034000
2022-06-23,0.050000
2024-12-27,0.314000
2025-12-29,0.299000
2016-03-24,0.072000
2017-06-23,0.071000
2018-06-22,0.075000
2020-06-24,0.059000
2020-12-29,0.150000
2020-09-04,0.038000
2023-06-23,0.103000
2024-09-06,0.017000
2015-06-19,0.077000
2015-09-04,0.037000
2017-03-21,0.062000
2018-09-21,0.074000
2019-09-06,0.044000
2016-06-24,0.082000
2017-09-06,0.036000
2019-12-27,0.035000
2022-12-28,0.034000