f/overrides/event-backup/dma-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
2022-07-18,0.056000
2022-09-19,0.056000
2023-03-17,0.055000
2026-05-19,0.113000
2022-03-18,0.059000
2026-03-20,0.113000
2025-04-17,0.073000
2024-12-20,0.324000
2022-04-18,0.060000
2023-05-18,0.053000
2025-03-20,0.073000
2025-06-18,0.083000
2026-02-17,0.113000
2026-07-21,0.113000
2026-08-21,0.113000
2022-08-18,0.057000
2022-10-20,0.054000
2023-01-19,0.055000
2023-06-16,0.053000
2026-06-18,0.113000
2022-06-16,0.059000
2023-02-16,0.056000
2025-05-19,0.073000
2022-01-24,0.060000
2022-05-19,0.059000
2022-11-17,0.056000
2022-12-19,0.055000
2023-04-17,0.054000
2025-07-18,0.083000
2025-08-18,0.083000
2026-04-20,0.113000
2022-02-17,0.060000