f/overrides/event-backup/iwl-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
2013-03-25,0.172000
2014-07-02,0.172000
2016-07-06,0.297000
2011-07-05,0.051000
2016-12-22,0.261000
2023-03-23,0.361000
2011-03-24,0.194000
2012-12-19,0.559000
2015-03-25,0.277000
2015-12-24,0.270000
2019-06-17,0.394000
2013-09-24,0.180000
2018-07-03,0.285000
2020-06-15,0.276000
2025-12-16,0.438000
2010-09-23,0.114000
2014-12-24,0.157000
2018-09-26,0.278000
2020-09-23,0.298000
2022-03-24,0.307000
2013-07-02,0.184000
2014-09-24,0.274000
2026-03-17,0.350000
2009-12-23,0.155000
2020-03-25,0.264000
2021-03-25,0.307000
2011-12-22,0.176000
2015-09-25,0.209000
2019-12-16,0.473000
2022-06-09,0.273000
2025-06-16,0.361000
2014-03-25,0.191000
2015-07-02,0.249000
2021-09-24,0.374000
2024-06-11,0.318000
2010-12-22,0.145000
2011-09-23,0.136000
2012-03-23,0.143000
2013-12-23,0.229000
2021-12-13,0.341000
2012-09-24,0.234000
2017-07-06,0.277000
2019-03-20,0.276000
2022-12-13,0.376000
2017-03-24,0.248000
2017-12-21,0.263000
2018-03-22,0.254000
2026-06-15,0.392000
2010-03-24,0.094000
2016-09-26,0.200000
2018-12-17,0.310000
2023-12-20,0.422000
2024-03-21,0.335000
2019-09-24,0.326000
2020-12-14,0.336000
2021-06-10,0.257000
2023-09-26,0.415000
2024-09-25,0.449000
2017-09-26,0.250000
2022-09-26,0.425000
2025-03-18,0.352000
2025-09-16,0.391000
2010-07-02,0.121000
2012-06-26,0.250000
2023-06-07,0.300000
2024-12-17,0.406000