f/overrides/event-backup/mvgax-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
2019-12-19,0.183000
2021-12-16,1.310000
2023-09-21,0.030000
2023-12-14,0.128000
2024-06-25,0.076000
2025-09-25,0.042000
2015-12-10,0.033000
2016-09-27,0.025000
2018-09-26,0.072000
2020-06-25,0.064000
2022-09-22,0.046000
2025-06-26,0.125000
2026-03-26,0.031000
2026-06-25,0.080000
2015-06-25,0.069000
2014-09-25,0.007000
2019-06-26,0.079000
2021-09-23,0.040000
2022-03-24,0.023000
2023-03-23,0.038000
2024-09-26,0.043000
2024-12-12,1.102000
2014-06-26,0.051000
2017-12-21,0.094000
2018-12-20,0.421000
2019-09-26,0.064000
2016-12-13,0.040000
2020-09-24,0.069000
2025-12-11,1.689000
2017-09-27,0.054000
2016-06-28,0.057000
2017-06-28,0.039000
2020-03-26,0.053000
2021-06-24,0.073000
2023-06-22,0.064000
2025-03-25,0.029000
2015-03-26,0.038000
2015-09-28,0.042000
2017-03-29,0.047000
2021-03-25,0.050000
2022-06-23,0.073000
2022-12-15,0.384000
2014-03-27,0.039000
2016-03-29,0.038000
2018-03-27,0.021000
2018-06-27,0.073000
2019-03-27,0.049000
2020-12-17,0.015000
2024-03-26,0.031000
2014-12-11,0.023000