f/overrides/event-backup/avudx-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
2013-12-23,0.052000
2016-12-13,0.149000
2017-06-20,0.038000
2021-03-23,0.041000
2026-06-09,0.043000
2014-06-10,0.051000
2018-03-20,0.026000
2019-12-20,0.034000
2022-03-22,0.034000
2013-09-10,0.035000
2014-12-23,0.053000
2017-12-26,0.047000
2020-12-22,0.181000
2017-09-19,0.050000
2019-10-22,0.598000
2020-03-10,0.042000
2023-09-19,0.046000
2016-12-27,0.049000
2025-03-25,0.034000
2019-06-18,0.043000
2023-12-19,0.461000
2015-03-10,0.015000
2016-09-20,0.034000
2017-12-12,0.512000
2021-06-22,0.051000
2023-06-20,0.061000
2017-03-21,0.030000
2019-03-19,0.047000
2024-09-17,0.051000
2015-12-28,0.051000
2018-12-11,0.710000
2020-09-22,0.044000
2024-06-18,0.058000
2024-12-17,0.735000
2025-06-24,0.048000
2025-09-23,0.045000
2016-03-15,0.042000
2022-06-21,0.057000
2014-12-09,0.532000
2016-06-21,0.039000
2023-03-21,0.035000
2015-09-08,0.042000
2018-06-19,0.035000
2022-12-21,1.066000
2025-12-16,0.717000
2018-12-20,0.045000
2019-09-17,0.043000
2020-06-16,0.044000
2021-09-21,0.049000
2022-09-20,0.042000
2026-03-10,0.026000
2015-06-09,0.047000
2018-09-18,0.040000
2021-12-21,1.134000
2014-09-09,0.043000
2014-03-11,0.016000
2015-12-08,0.524000
2024-03-19,0.043000