f/overrides/event-backup/madfx-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
2026-03-20,0.160000
2018-12-20,0.190000
2022-06-24,0.140000
2024-12-13,0.200000
2019-09-27,0.170000
2019-12-20,0.280000
2021-12-17,0.370000
2023-06-23,0.130000
2017-06-30,0.120000
2017-12-20,0.210000
2018-03-29,0.110000
2025-03-21,0.150000
2025-12-12,2.370000
2017-03-28,0.130000
2021-03-26,0.160000
2024-09-20,0.170000
2021-09-29,0.150000
2022-03-25,0.130000
2025-09-19,0.180000
2023-03-24,0.140000
2025-06-13,0.180000
2018-06-29,0.120000
2019-03-29,0.270000
2021-06-25,0.170000
2024-03-22,0.140000
2024-06-21,0.160000
2026-06-12,0.180000
2017-09-29,0.130000
2018-09-28,0.150000
2023-09-22,0.150000
2022-12-16,1.820000
2023-12-15,0.190000
2020-03-27,0.180000
2020-12-18,0.170000
2022-09-23,0.160000
2019-06-28,0.140000
2020-06-26,0.160000
2020-09-29,0.160000