f/overrides/event-backup/ign-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
2025-03-18,0.231843
2011-03-25,0.000802
2014-03-25,0.032080
2021-09-24,0.053046
2022-09-26,0.078048
2025-09-16,0.201924
2015-09-25,0.066994
2017-06-27,0.063283
2017-09-26,0.081800
2024-03-21,0.184903
2011-12-22,0.065760
2017-03-24,0.057352
2018-03-22,0.087555
2019-03-20,0.037680
2020-12-14,0.069264
2023-03-23,0.065041
2012-09-25,0.019820
2012-12-19,0.595849
2014-09-24,0.051158
2017-12-19,0.076188
2018-06-26,0.122232
2020-09-23,0.101048
2026-03-17,0.184102
2011-09-26,0.014725
2013-06-26,0.045134
2025-06-16,0.158999
2016-09-26,0.053530
2018-09-26,0.059044
2019-06-17,0.058349
2019-09-24,0.071602
2009-12-21,0.072138
2015-12-24,0.080682
2016-03-23,0.129640
2023-09-26,0.074720
2013-03-25,0.025355
2014-12-24,0.061364
2022-03-24,0.028495
2023-12-20,0.043805
2024-12-17,0.287157
2011-06-23,0.000364
2016-12-21,0.070782
2019-12-16,0.061865
2023-06-07,0.052811
2012-06-19,0.077742
2013-09-24,0.037177
2021-12-13,0.024772
2015-06-24,0.061543
2018-12-17,0.036210
2022-06-09,0.048294
2010-12-20,0.027060
2014-06-24,0.040719
2015-03-25,0.056811
2025-12-16,0.398660
2009-06-22,0.017113
2021-03-25,0.055497
2024-06-11,0.344653
2013-12-23,0.016447
2020-03-25,0.122601
2021-06-10,0.056406
2008-12-22,0.044308
2024-09-25,0.505893
2026-06-15,0.124149
2016-06-21,0.074650
2020-06-15,0.066943
2022-12-13,0.054199