f/overrides/event-backup/fmat-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
2022-12-16,0.206000
2024-09-20,0.210000
2015-09-18,0.156000
2020-06-19,0.149000
2018-09-21,0.148000
2019-06-21,0.191000
2021-03-19,0.163000
2021-06-18,0.178000
2024-06-21,0.187000
2025-12-19,0.210000
2014-09-19,0.116000
2017-06-16,0.135000
2026-03-20,0.198000
2014-03-21,0.125000
2023-03-17,0.199000
2020-03-20,0.205000
2022-03-18,0.201000
2026-06-18,0.211000
2017-03-17,0.133000
2017-09-15,0.123000
2018-03-16,0.144000
2019-12-20,0.168000
2020-12-18,0.173000
2022-09-16,0.200000
2024-12-20,0.205000
2025-09-19,0.216000
2015-12-29,0.006000
2017-12-15,0.144000
2019-03-15,0.128000
2021-09-17,0.197000
2021-12-17,0.186000
2023-12-15,0.214000
2025-03-21,0.220000
2025-06-20,0.224000
2015-12-18,0.107000
2018-06-15,0.159000
2014-06-20,0.085000
2014-12-19,0.127000
2016-06-17,0.121000
2018-12-21,0.168000
2020-09-18,0.169000
2023-09-15,0.208000
2013-12-20,0.100000
2013-12-27,0.002000
2024-03-15,0.207000
2016-09-16,0.134000
2016-12-16,0.113000
2019-09-20,0.162000
2023-06-16,0.211000
2015-03-20,0.127000
2015-06-19,0.128000