f/overrides/event-backup/asgi-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
2023-07-21,0.120000
2024-11-21,0.210000
2025-05-22,0.200000
2022-01-21,0.108000
2023-01-23,0.120000
2024-05-22,0.200000
2020-12-01,0.108000
2022-11-21,0.120000
2023-11-21,0.120000
2024-04-22,0.150000
2026-06-23,0.230000
2026-08-24,0.220000
2025-09-23,0.210000
2025-11-21,0.210000
2025-01-24,0.200000
2025-07-24,0.210000
2026-02-20,0.220000
2023-03-23,0.120000
2024-07-24,0.200000
2025-10-24,0.210000
2026-01-23,0.210000
2021-11-18,0.108000
2023-08-23,0.120000
2024-02-21,0.150000
2025-03-25,0.190000
2021-06-22,0.108000
2022-06-21,0.120000
2024-09-20,0.210000
2026-04-22,0.230000
2026-07-23,0.220000
2020-11-02,0.108000
2021-10-21,0.108000
2022-12-29,0.120000
2023-04-20,0.120000
2023-06-22,0.120000
2021-02-18,0.108000
2021-08-19,0.108000
2022-10-21,0.120000
2025-04-23,0.200000
2021-01-21,0.108000
2022-07-21,0.120000
2023-02-17,0.120000
2023-05-18,0.120000
2023-12-28,0.120000
2025-08-22,0.210000
2025-12-31,0.210000
2026-03-24,0.230000
2020-10-01,0.108000
2021-04-22,0.108000
2021-12-29,0.108000
2022-02-18,0.108000
2022-03-23,0.108000
2022-05-19,0.120000
2022-08-23,0.120000
2026-05-21,0.230000
2021-05-20,0.108000
2022-04-21,0.120000
2023-10-23,0.120000
2024-08-23,0.200000
2025-02-21,0.190000
2021-03-23,0.108000
2023-09-21,0.120000
2024-01-23,0.160000
2024-03-20,0.150000
2024-12-30,0.200000
2021-07-22,0.108000
2021-09-17,0.108000
2022-09-22,0.120000
2024-06-21,0.210000
2024-10-24,0.210000
2025-06-23,0.210000