f/overrides/event-backup/mmtrs-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
2024-06-21,0.477000
2012-06-04,0.509000
2015-03-26,0.278000
2017-12-15,0.817000
2019-12-19,0.993000
2025-12-17,2.351000
2011-03-24,0.857000
2013-03-14,0.289000
2018-03-19,0.260000
2026-06-23,0.336000
2016-06-17,0.532000
2019-09-20,0.978000
2020-03-18,0.798000
2022-06-16,0.260000
2023-09-22,1.425000
2012-12-10,0.222000
2020-09-23,0.772000
2021-09-21,0.778000
2023-12-20,0.641000
2019-03-22,0.287000
2021-03-19,0.827000
2010-12-22,1.123000
2012-03-15,0.838000
2014-12-17,0.726000
2021-06-21,0.567000
2022-03-28,0.559000
2024-09-20,1.335000
2026-03-24,1.243000
2011-06-06,0.526000
2018-06-15,1.082000
2020-06-18,0.546000
2011-09-08,1.233000
2012-09-05,0.763000
2014-03-28,2.291000
2023-03-23,0.666000
2015-06-17,0.315000
2011-12-08,0.768000
2024-03-21,0.560000
2016-12-15,0.824000
2021-12-17,0.817000
2016-03-22,0.215000
2020-12-21,0.727000
2023-06-22,0.379000
2014-10-08,0.082000
2017-09-15,0.255000
2022-12-20,0.655000
2019-06-19,4.242000
2015-12-16,0.764000
2016-09-14,0.978000
2018-09-24,0.520000
2018-12-18,0.983000
2015-09-17,1.329000
2017-03-14,0.286000