f/overrides/event-backup/ardtx-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
2014-06-17,0.037000
2013-09-24,0.026000
2014-09-23,0.044000
2022-09-27,0.038000
2024-06-25,0.076000
2018-06-26,0.062000
2023-12-21,0.412000
2026-06-11,0.086000
2018-03-27,0.040000
2017-12-28,0.153000
2017-10-19,0.093000
2015-06-23,0.028000
2018-09-25,0.040000
2014-12-30,0.226000
2019-09-24,0.037000
2020-03-24,0.036000
2020-06-23,0.040000
2020-09-29,0.575000
2022-06-28,0.061000
2022-12-28,0.475000
2023-06-27,0.054000
2015-09-29,0.032000
2026-03-12,0.041000
2025-03-27,0.065000
2018-12-31,0.254000
2021-06-29,0.044000
2016-06-28,0.035000
2016-03-22,0.026000
2019-03-26,0.038000
2022-03-29,0.056000
2024-03-26,0.061000
2016-12-29,0.201000
2020-12-29,0.124000
2013-12-30,0.130000
2016-09-27,0.030000
2017-03-28,0.031000
2019-12-30,0.876000
2025-06-10,0.470000
2025-12-19,0.544000
2014-03-25,0.026000
2021-12-28,1.009000
2015-03-24,0.270000
2018-12-27,0.692000
2021-09-28,0.034000
2024-09-24,0.041000
2025-09-25,0.080000
2017-09-26,0.037000
2017-06-27,0.039000
2021-03-30,0.020000
2024-12-20,0.364000
2019-06-25,0.046000
2023-09-26,0.051000
2015-12-30,0.108000
2023-03-28,0.040000