f/overrides/event-backup/abbv-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
2016-01-13,0.570000
2017-04-11,0.640000
2021-01-14,1.300000
2024-10-15,1.550000
2015-10-13,0.510000
2016-07-13,0.570000
2021-10-14,1.300000
2026-04-15,1.730000
2022-07-14,1.410000
2023-01-12,1.480000
2023-10-12,1.480000
2025-07-15,1.640000
2014-04-11,0.420000
2018-10-12,0.960000
2019-07-12,1.070000
2022-04-13,1.410000
2022-10-13,1.410000
2024-07-15,1.550000
2018-04-12,0.960000
2020-10-14,1.180000
2013-01-11,0.400000
2014-10-10,0.420000
2016-04-13,0.570000
2019-01-14,1.070000
2014-01-13,0.400000
2017-07-12,0.640000
2018-07-12,0.960000
2026-01-16,1.730000
2023-07-13,1.480000
2013-10-10,0.400000
2017-10-12,0.640000
2021-07-14,1.300000
2022-01-13,1.410000
2025-10-15,1.640000
2016-10-12,0.570000
2019-10-11,1.070000
2020-01-14,1.180000
2024-04-12,1.550000
2013-04-11,0.400000
2013-07-11,0.400000
2025-04-15,1.640000
2014-07-11,0.420000
2015-07-13,0.510000
2018-01-11,0.710000
2025-01-15,1.640000
2019-04-12,1.070000
2020-04-14,1.180000
2015-01-13,0.490000
2024-01-12,1.550000
2017-01-11,0.640000
2020-07-14,1.180000
2026-07-15,1.730000
2015-04-13,0.510000
2021-04-14,1.300000
2023-04-13,1.480000