f/overrides/event-backup/aces-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
2018-12-20,0.077000
2019-03-21,0.120000
2021-03-18,0.048000
2023-03-23,0.060000
2023-12-21,0.178000
2019-06-20,0.022000
2020-12-22,0.081000
2025-12-18,0.091000
2020-09-17,0.098000
2021-06-17,0.175000
2024-06-20,0.081000
2025-03-20,0.010000
2020-03-19,0.153000
2021-12-22,0.118000
2022-09-22,0.147000
2026-03-19,0.010000
2026-06-18,0.020000
2019-09-19,0.158000
2022-03-24,0.063000
2022-06-23,0.129000
2025-06-20,0.024000
2025-09-18,0.101000
2020-06-18,0.115000
2021-09-23,0.114000
2023-09-21,0.135000
2019-12-19,0.140000
2022-12-22,0.155000
2023-06-22,0.144000
2024-09-19,0.095000
2024-12-19,0.111000