f/overrides/event-backup/lamhx-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
2021-06-29,0.047000
2021-12-29,0.071000
2016-09-30,0.070000
2017-12-29,0.068000
2025-12-18,1.091000
2015-12-31,0.072000
2016-12-16,0.967000
2017-06-30,0.078000
2018-06-29,0.076000
2016-03-31,0.070000
2016-06-30,0.072000
2024-12-27,0.054000
2026-03-27,0.059000
2023-03-30,0.047000
2023-12-19,0.110000
2021-09-29,0.059000
2017-12-15,0.987000
2018-12-27,0.060000
2019-12-18,0.696000
2021-03-30,0.044000
2022-12-28,0.050000
2018-12-18,1.026000
2019-09-27,0.069000
2022-06-29,0.072000
2025-03-27,0.055000
2019-12-27,0.075000
2020-09-29,0.051000
2022-03-30,0.049000
2022-12-20,0.827000
2023-06-29,0.047000
2023-12-27,0.058000
2015-12-18,0.995000
2017-03-31,0.071000
2017-09-29,0.071000
2018-09-28,0.073000
2024-03-27,0.051000
2024-06-27,0.051000
2025-09-23,0.058000
2026-06-26,0.055000
2019-06-28,0.072000
2020-06-30,0.061000
2020-12-29,0.046000
2015-09-30,0.076000
2021-12-17,1.480000
2016-12-30,0.086000
2022-09-29,0.043000
2025-12-30,0.063000
2018-03-29,0.068000
2024-09-25,0.050000
2025-06-24,0.053000
2023-09-28,0.048000
2024-12-17,1.022000
2020-12-18,0.426000
2019-03-29,0.071000
2020-03-27,0.058000