f/overrides/event-backup/icsfx-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
2021-03-25,0.133000
2013-12-13,0.093000
2015-09-17,0.105000
2019-03-21,0.123000
2013-09-19,0.093000
2015-06-18,0.108000
2021-12-14,2.281000
2024-09-26,0.143000
2020-09-17,0.141000
2024-12-12,2.589000
2013-03-21,0.092000
2017-06-15,0.124000
2019-06-20,0.132000
2023-12-13,1.976000
2025-03-27,0.143000
2025-12-11,2.380000
2018-09-13,0.127000
2020-06-18,0.123000
2022-03-24,0.132000
2016-06-16,0.123000
2017-12-13,0.698000
2019-12-13,1.554000
2023-06-22,0.143000
2014-09-18,0.108000
2016-09-15,0.124000
2017-03-16,0.127000
2023-09-28,0.143000
2022-09-22,0.159000
2023-03-23,0.143000
2016-03-17,0.124000
2018-12-14,1.919000
2019-09-19,0.148000
2024-06-27,0.143000
2025-09-25,0.148000
2026-06-25,0.149000
2017-09-14,0.125000
2018-03-22,0.110000
2020-03-19,0.123000
2021-06-24,0.135000
2021-09-23,0.133000
2022-12-14,3.100000
2013-06-20,0.092000
2015-03-19,0.108000
2020-12-11,0.197000
2015-12-11,2.095000
2018-06-21,0.110000
2014-03-20,0.096000
2014-06-19,0.097000
2022-06-23,0.161000
2024-03-28,0.143000
2025-06-26,0.143000
2026-03-26,0.150000
2012-12-07,0.090000
2014-12-12,0.212000
2016-12-13,1.580000