f/overrides/event-backup/mxqbx-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
2021-12-30,0.880000
2022-09-08,0.626000
2024-09-10,0.301000
2017-06-27,0.117000
2017-09-08,0.305000
2019-06-26,0.119000
2025-09-09,0.277000
2015-06-24,0.104000
2020-09-08,0.361000
2022-12-29,0.297000
2023-06-27,0.130000
2015-12-30,0.374000
2016-12-29,0.354000
2018-09-11,0.423000
2018-12-28,0.596000
2019-12-30,0.280000
2021-06-25,0.090000
2021-09-07,0.526000
2018-06-27,0.127000
2023-09-08,0.233000
2019-09-10,0.750000
2023-12-28,0.295000
2024-12-30,0.418000
2022-06-27,0.111000
2025-12-30,0.387000
2016-06-28,0.108000
2016-09-09,0.025000
2017-12-28,0.527000
2020-06-26,0.088000
2020-12-30,0.264000