f/overrides/event-backup/epsrx-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
2021-12-07,0.069000
2023-06-30,0.182000
2024-09-30,0.107000
2014-09-29,0.124000
2017-09-29,0.099000
2019-06-28,0.245000
2022-12-12,0.086000
2024-03-28,0.247000
2013-09-27,0.097000
2017-06-30,0.224000
2019-12-10,0.430000
2023-12-11,0.065000
2026-06-30,0.233000
2014-06-27,0.269000
2015-03-31,0.134000
2016-12-08,0.119000
2016-09-30,0.110000
2021-03-31,0.202000
2021-09-30,0.100000
2023-03-31,0.235000
2014-03-28,0.144000
2014-12-10,0.751000
2016-03-31,0.142000
2024-06-28,0.214000
2025-03-31,0.222000
2016-06-30,0.212000
2017-03-31,0.127000
2022-09-30,0.089000
2019-09-30,0.116000
2020-06-30,0.124000
2020-12-08,0.092000
2023-09-29,0.104000
2025-06-30,0.189000
2013-12-09,0.155000
2015-12-09,1.132000
2018-06-29,0.255000
2025-09-30,0.104000
2025-12-04,1.544000
2026-03-31,0.142000
2020-03-31,0.230000
2021-06-30,0.202000
2022-03-31,0.170000
2022-06-30,0.182000
2018-03-29,0.173000
2018-09-28,0.106000
2018-12-11,1.126000
2019-03-29,0.196000
2020-09-30,0.072000
2024-12-05,1.682000
2015-06-30,0.254000
2015-09-30,0.139000
2017-12-13,0.121000