f/overrides/event-backup/cibr-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
2022-06-24,0.003000
2023-06-27,0.053000
2017-09-21,0.007000
2021-12-23,0.281000
2026-06-25,0.072000
2018-12-18,0.039000
2020-03-26,0.399000
2019-06-14,0.018000
2019-12-13,0.047000
2025-03-27,0.004000
2026-03-26,0.110000
2017-06-22,0.010000
2018-06-21,0.008000
2018-03-22,0.005000
2020-09-24,0.033000
2020-12-24,0.027000
2024-06-27,0.066000
2024-12-13,0.081000
2025-09-25,0.001000
2015-12-23,0.103000
2017-12-21,0.005000
2025-12-12,0.208000
2025-06-26,0.090000
2021-06-24,0.033000
2024-09-26,0.011000
2022-12-23,0.095000
2023-12-22,0.166000
2024-03-21,0.024000
2016-06-22,0.015000
2019-09-25,0.004000
2020-06-25,0.030000
2022-03-25,0.020000
2023-09-22,0.009000
2016-09-21,0.006000
2016-12-21,0.020000