f/overrides/event-backup/ddwm-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
2022-03-25,0.190000
2023-06-26,0.575000
2024-06-25,0.545000
2025-12-26,0.191000
2016-12-23,0.070000
2017-03-27,0.215000
2019-06-24,0.465000
2024-12-31,0.011000
2026-06-25,0.660000
2020-06-23,0.280000
2021-12-27,0.232000
2022-06-24,0.620000
2022-09-26,0.270000
2022-12-23,0.171000
2023-09-25,0.330000
2023-12-22,0.255000
2025-06-25,0.555000
2017-06-26,0.375000
2020-03-24,0.062000
2021-09-24,0.480000
2025-09-25,0.215000
2021-03-25,0.062000
2025-03-26,0.115000
2026-03-26,0.115000
2021-06-24,0.375000
2016-06-20,0.275000
2017-09-26,0.090000
2020-12-21,0.313000
2019-03-26,0.175000
2019-09-24,0.190000
2024-03-22,0.195000
2017-12-26,0.129000
2018-06-25,0.794000
2018-09-25,0.148000
2016-09-26,0.165000
2020-09-22,0.325000
2023-03-27,0.275000
2024-09-25,0.200000
2024-12-26,0.276000
2016-12-05,0.441000
2018-12-24,0.197000
2019-12-23,0.270000