f/overrides/event-backup/mort-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
2017-04-03,0.420000
2018-04-02,0.424000
2012-10-01,0.648000
2019-04-01,0.377000
2019-12-30,0.639000
2022-10-03,0.413000
2022-12-28,0.399000
2024-04-01,0.300000
2024-07-01,0.250000
2025-04-01,0.379000
2018-07-02,0.382000
2014-07-01,0.450000
2026-04-01,0.359000
2012-12-27,0.780000
2017-07-03,0.386000
2021-04-01,0.327000
2016-10-03,0.472000
2019-07-01,0.365000
2019-10-01,0.385000
2021-12-29,0.438000
2016-12-28,0.485000
2013-12-27,1.450000
2016-07-01,0.349000
2017-10-02,0.465000
2017-12-27,0.612000
2018-12-27,0.460000
2020-07-01,0.300000
2020-10-01,0.337000
2024-10-01,0.316000
2015-04-01,0.455000
2025-12-29,0.338000
2021-07-01,0.301000
2021-10-01,0.408000
2022-07-01,0.327000
2012-04-02,0.627000
2024-12-27,0.360000
2023-12-27,0.341000
2026-07-01,0.425000
2013-04-01,0.726000
2020-12-29,0.354000
2023-10-02,0.340000
2025-10-01,0.363000
2012-07-02,0.703000
2018-10-01,0.480000
2023-07-03,0.287000
2014-12-29,0.918000
2015-10-01,0.480000
2015-12-29,0.500000
2023-04-03,0.472000
2013-07-01,0.600000
2013-10-01,0.615000
2014-04-01,0.550000
2015-07-01,0.500000
2020-04-01,0.368000
2025-07-01,0.261000
2011-10-03,0.680000
2014-10-01,0.470000
2022-04-01,0.390000
2011-12-28,0.620000