f/overrides/event-backup/ffefx-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
2025-06-30,0.049000
2026-06-30,0.054000
2020-09-30,0.076000
2025-09-30,0.055000
2013-09-30,0.082000
2021-12-15,1.221000
2014-12-30,0.107000
2016-12-29,0.074000
2022-12-29,0.571000
2024-12-16,1.315000
2024-12-30,0.058000
2015-03-31,0.079000
2014-03-31,0.112000
2015-09-30,0.088000
2017-03-31,0.082000
2017-06-30,0.034000
2017-12-15,1.713000
2020-06-30,0.065000
2022-03-31,0.076000
2013-12-13,1.704000
2024-09-30,0.064000
2018-09-28,0.073000
2019-03-29,0.079000
2022-12-15,0.497000
2025-12-30,0.069000
2016-12-15,2.173000
2019-06-28,0.055000
2019-09-30,0.094000
2020-03-31,0.087000
2025-12-15,0.926000
2015-12-15,1.124000
2016-09-30,0.087000
2018-12-28,0.098000
2020-12-30,0.025000
2021-03-31,0.084000
2021-12-30,0.064000
2022-06-30,0.043000
2023-03-31,0.074000
2015-12-30,0.130000
2026-03-31,0.055000
2023-12-15,0.504000
2019-12-16,0.811000
2025-03-31,0.059000
2015-06-30,0.114000
2014-06-30,0.155000
2016-03-31,0.083000
2019-12-30,0.058000
2021-06-30,0.040000
2022-09-30,0.080000
2013-12-30,0.079000
2018-12-17,1.047000
2013-06-28,0.091000
2014-12-15,1.131000
2018-03-29,0.079000
2021-09-30,0.075000
2023-06-30,0.063000
2024-06-28,0.061000
2013-03-28,0.079000
2017-12-28,0.071000
2018-06-29,0.065000
2023-09-29,0.059000
2024-03-28,0.060000
2014-09-30,0.076000
2017-09-29,0.072000
2020-12-01,0.020000
2023-12-28,0.073000
2016-06-30,0.041000