f/overrides/event-backup/mxxjx-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
2015-12-29,0.074000
2019-09-25,0.076000
2024-12-27,0.492000
2015-09-21,0.043000
2017-03-21,0.041000
2017-06-23,0.057000
2017-09-06,0.001000
2018-03-23,0.055000
2020-03-25,0.067000
2021-06-23,0.033000
2022-12-28,0.071000
2015-06-19,0.017000
2016-06-24,0.044000
2017-12-27,0.064000
2018-06-22,0.066000
2020-12-29,0.145000
2023-06-23,0.076000
2016-03-24,0.039000
2016-09-23,0.044000
2021-09-24,0.040000
2023-09-06,0.006000
2016-09-07,0.002000
2021-03-24,0.038000
2019-06-24,0.076000
2017-09-22,0.051000
2018-12-27,0.091000
2020-09-25,0.046000
2023-12-27,0.067000
2025-09-05,0.014000
2016-12-28,0.090000
2019-12-27,0.073000
2021-09-03,0.012000
2022-03-25,0.035000
2022-06-23,0.036000
2023-09-26,0.079000
2025-12-29,0.376000
2018-09-21,0.068000
2020-06-24,0.061000
2021-12-29,0.142000
2022-09-27,0.057000
2023-03-27,0.080000
2019-03-25,0.064000