f/overrides/event-backup/lyb-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
2021-06-04,1.130000
2023-03-03,1.190000
2025-03-10,1.340000
2011-11-22,4.750000
2015-08-21,0.780000
2015-11-19,0.780000
2017-03-02,0.850000
2019-03-01,1.000000
2018-03-02,1.000000
2025-12-01,1.370000
2013-02-21,0.400000
2018-09-04,1.000000
2022-11-25,1.190000
2026-06-01,0.690000
2016-02-25,0.780000
2026-03-02,0.690000
2011-05-03,0.100000
2012-03-08,0.250000
2013-05-30,0.500000
2013-11-21,0.600000
2024-08-26,1.340000
2023-08-25,1.250000
2024-12-02,1.340000
2014-08-21,0.700000
2014-11-20,0.700000
2017-06-01,0.900000
2017-09-01,0.900000
2019-06-07,1.050000
2022-06-03,6.390000
2024-03-01,1.250000
2013-09-19,0.500000
2016-05-20,0.850000
2016-08-12,0.850000
2016-11-25,0.850000
2020-08-28,1.050000
2019-11-29,1.050000
2020-06-05,1.050000
2012-11-15,3.150000
2018-12-07,1.000000
2022-03-04,1.130000
2023-11-24,1.250000
2012-05-17,0.400000
2021-08-27,1.130000
2023-05-26,1.250000
2017-12-04,0.900000
2020-11-27,1.050000
2022-08-26,1.190000
2024-06-03,1.340000
2014-02-27,0.600000
2015-02-26,0.700000
2018-06-08,1.000000
2014-04-24,0.700000
2021-03-05,1.050000
2011-08-15,0.200000
2012-08-30,0.400000
2019-09-03,1.050000
2025-08-25,1.370000
2026-08-24,0.690000
2020-02-28,1.050000
2021-11-26,1.130000
2025-06-02,1.370000