f/overrides/event-backup/fcenx-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
2021-10-01,0.222000
2023-12-20,0.016000
2022-07-20,0.062000
2023-04-20,0.113000
2023-10-20,0.197000
2024-11-19,0.103000
2021-04-01,0.145000
2025-07-21,0.145000
2019-12-30,0.016000
2020-10-01,0.110000
2021-07-01,0.092000
2022-04-20,0.096000
2024-07-22,0.133000
2025-12-22,1.447000
2026-04-20,0.054000
2020-07-01,0.063000
2020-04-01,0.055000
2023-07-20,0.151000
2024-04-22,0.102000
2024-10-21,0.179000
2025-04-21,0.158000
2025-10-20,0.083000
2019-12-02,0.076000
2022-12-20,0.024000
2026-07-20,0.154000
2019-10-01,0.027000
2020-12-01,0.025000
2021-12-01,0.610000