f/overrides/event-backup/dfax-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
2023-12-19,0.177000
2024-09-17,0.182000
2026-03-24,0.058000
2021-12-16,0.244000
2022-03-22,0.017000
2022-09-20,0.227000
2023-03-21,0.042000
2022-06-22,0.281000
2022-12-20,0.187000
2024-12-17,0.234000
2025-06-24,0.362000
2023-06-21,0.302000
2024-03-19,0.028000
2025-09-23,0.185000
2025-12-16,0.230000
2026-06-23,0.385000
2021-09-21,0.121000
2023-09-19,0.214000
2024-06-18,0.296000
2025-03-25,0.069000