f/overrides/event-backup/agasx-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
2026-01-22,0.047000
2026-06-18,0.051000
2016-03-17,0.068000
2017-03-16,0.060000
2019-12-26,0.994000
2022-03-17,0.058000
2022-06-16,0.036000
2023-12-20,0.290000
2016-09-22,0.003000
2017-09-21,0.035000
2019-06-20,0.029000
2022-12-22,0.485000
2025-10-16,0.063000
2015-12-29,0.400000
2021-03-18,0.066000
2021-06-17,0.033000
2026-05-21,0.050000
2026-04-16,0.049000
2015-09-17,0.036000
2018-06-21,0.021000
2019-09-19,0.023000
2021-09-16,0.038000
2022-09-22,0.033000
2025-11-20,0.055000
2020-03-19,0.055000
2024-12-18,0.340000
2026-03-19,0.048000
2016-12-29,0.205000
2017-06-22,0.014000
2018-03-22,0.035000
2018-09-20,0.019000
2018-12-27,0.594000
2020-06-18,0.016000
2026-07-16,0.051000
2017-12-28,1.189000
2019-03-21,0.098000
2020-12-24,0.678000
2021-12-23,0.959000
2025-12-18,0.714000
2026-02-19,0.048000