f/overrides/event-backup/avus-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
2020-09-22,0.189000
2021-03-23,0.164000
2022-12-15,0.322000
2023-09-21,0.267000
2024-06-24,0.298000
2025-06-24,0.309000
2019-12-23,0.191000
2020-06-23,0.183000
2022-06-21,0.263000
2024-12-17,0.342000
2026-03-10,0.244000
2021-06-22,0.200000
2022-03-22,0.215000
2025-12-16,0.325000
2026-06-09,0.336000
2025-09-23,0.280000
2020-03-24,0.153000
2020-12-17,0.224000
2021-12-16,0.271000
2022-09-20,0.285000
2021-09-21,0.231000
2023-03-23,0.264000
2023-06-20,0.277000
2023-12-18,0.343000
2024-03-21,0.262000
2024-09-23,0.327000
2025-03-25,0.296000