f/overrides/event-backup/mfwlx-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
2018-06-27,0.132000
2018-09-26,0.069000
2013-03-27,0.039000
2017-12-21,0.314000
2025-12-11,1.246000
2021-09-23,0.061000
2022-06-23,0.014000
2014-03-27,0.051000
2017-09-27,0.081000
2026-03-26,0.066000
2016-06-28,0.046000
2023-09-21,0.079000
2024-09-26,0.079000
2013-12-10,0.222000
2019-03-27,0.045000
2022-09-22,0.015000
2012-12-11,0.147000
2020-12-17,1.211000
2025-06-26,0.151000
2015-12-10,0.677000
2016-12-13,0.134000
2019-09-26,0.055000
2021-06-24,0.102000
2013-06-26,0.046000
2016-03-29,0.015000
2020-03-26,0.065000
2020-09-24,0.072000
2023-06-22,0.090000
2024-06-25,0.077000
2012-09-25,0.042000
2014-12-11,0.352000
2018-12-20,0.342000
2019-06-26,0.122000
2026-06-25,0.120000
2025-03-25,0.049000
2025-09-25,0.108000
2017-06-28,0.105000
2019-12-19,0.653000
2022-03-24,0.013000
2024-12-12,1.288000
2015-09-28,0.030000
2016-09-27,0.043000
2024-03-26,0.073000
2022-12-15,0.438000
2014-09-25,0.080000
2017-03-29,0.013000
2021-12-16,1.734000
2023-03-23,0.035000
2023-12-14,0.480000
2020-06-25,0.066000
2021-03-25,0.070000
2013-09-25,0.040000
2014-06-26,0.094000
2015-03-26,0.017000
2018-03-27,0.063000