f/overrides/event-backup/mxdqx-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
2024-12-27,0.340000
2016-12-28,0.124000
2017-12-27,0.098000
2019-03-25,0.066000
2019-06-24,0.071000
2022-12-28,0.109000
2025-12-29,0.323000
2016-06-24,0.065000
2018-03-23,0.063000
2020-03-25,0.059000
2020-09-25,0.044000
2019-09-25,0.067000
2019-12-27,0.067000
2022-09-27,0.073000
2015-06-19,0.060000
2015-09-04,0.004000
2017-06-23,0.072000
2018-12-27,0.096000
2021-09-03,0.027000
2023-12-27,0.102000
2015-09-21,0.069000
2016-09-23,0.048000
2017-03-21,0.053000
2020-06-24,0.057000
2016-03-24,0.063000
2021-12-29,0.192000
2022-03-25,0.021000
2024-09-06,0.007000
2025-09-05,0.009000
2015-12-29,0.106000
2018-06-22,0.069000
2021-03-24,0.030000
2023-03-27,0.073000
2023-09-26,0.096000
2017-09-22,0.074000
2020-12-29,0.073000
2021-06-23,0.027000
2021-09-24,0.011000
2018-09-07,0.002000
2018-09-21,0.062000
2022-06-23,0.038000
2023-06-23,0.089000