f/overrides/event-backup/cbdyx-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
2014-12-10,1.440000
2022-03-16,0.134000
2022-06-16,0.136000
2016-09-19,0.135000
2017-03-17,0.116000
2018-09-19,0.174000
2019-06-13,0.195000
2021-09-17,0.128000
2025-06-17,0.248000
2015-06-18,0.243000
2017-09-19,0.148000
2018-06-15,0.159000
2020-06-15,0.173000
2022-12-08,1.780000
2015-03-20,0.074000
2015-09-22,0.246000
2015-12-10,0.928000
2019-03-18,0.147000
2020-09-18,0.145000
2022-09-19,0.156000
2025-12-08,2.789000
2016-12-09,0.284000
2021-03-16,0.115000
2024-06-18,0.274000
2024-12-09,3.228000
2016-03-17,0.105000
2017-06-16,0.135000
2017-12-08,0.799000
2019-12-06,1.307000
2021-06-16,0.121000
2018-03-16,0.116000
2018-12-07,1.740000
2019-09-18,0.199000
2020-12-08,2.130000
2023-03-16,0.156000
2023-09-19,0.282000
2023-12-08,0.236000
2025-03-18,0.251000
2025-09-17,0.281000
2026-06-16,0.267000
2016-06-17,0.122000
2020-03-17,0.173000
2021-12-08,4.409000
2023-06-16,0.249000
2024-03-18,0.254000
2024-09-18,0.297000
2026-03-17,0.273000