f/overrides/event-backup/bmcix-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
2023-06-30,0.163000
2024-08-30,0.191000
2025-12-31,0.223000
2008-12-04,0.005000
2020-10-30,0.127000
2022-01-03,0.132000
2022-06-30,0.152000
2021-11-30,0.163000
2022-09-30,0.161000
2017-07-20,13.542000
2020-04-08,0.284000
2020-08-31,0.152000
2021-05-28,0.192000
2026-03-31,0.225000
2026-07-31,0.195000
2000-11-13,10.076000
2016-12-06,2.221000
2017-10-12,0.127000
2024-01-31,0.131000
2023-11-30,0.174000
2021-12-31,0.191000
2022-02-28,0.169000
2023-04-28,0.155000
2023-07-31,0.138000
2024-10-31,0.182000
2024-11-29,0.195000
2025-02-28,0.188000
2025-03-31,0.209000
2018-07-19,0.299000
2021-06-30,0.151000
2022-05-31,0.231000
2022-08-31,0.164000
2025-07-31,0.173000
2026-05-29,0.217000
2021-12-07,0.075000
2022-12-08,0.049000
2023-03-31,0.174000
2023-09-29,0.162000
2015-12-11,2.919000
2020-06-30,0.111000
2020-11-30,0.132000
2021-07-15,0.080000
2024-06-28,0.202000
2024-07-31,0.167000
2026-04-30,0.196000
2019-04-10,0.256000
2026-01-30,0.182000
2018-10-11,0.286000
2019-12-05,0.274000
2021-01-29,0.116000
2020-07-31,0.117000
2022-10-31,0.125000
2023-02-28,0.156000
2024-03-28,0.176000
2021-09-30,0.167000
2024-02-29,0.165000
2024-05-31,0.185000
2009-12-04,0.068000
2017-12-04,0.482000
2018-12-06,1.318000
2020-09-30,0.161000
2025-01-31,0.178000
2025-09-30,0.187000
2022-01-31,0.133000
2022-04-29,0.127000
2023-05-31,0.176000
2024-12-31,0.188000
2021-02-26,0.170000
2021-07-30,0.139000
2022-12-30,0.165000
2024-04-30,0.145000
2012-12-13,1.124000
2014-12-12,6.181000
2018-04-11,0.334000
2019-07-18,0.236000
2025-11-28,0.215000
2026-06-30,0.215000
2026-02-27,0.205000
2021-08-31,0.163000
2023-01-31,0.132000
2023-08-31,0.181000
2025-10-31,0.195000
2021-10-29,0.154000
2022-03-31,0.162000
2022-07-29,0.138000
2025-04-30,0.202000
1999-11-10,3.302000
2010-12-02,0.691000
2020-12-31,0.158000
2021-03-31,0.160000
2025-06-30,0.209000
2001-12-21,0.406000
2011-12-12,3.935000
2024-09-30,0.211000
2022-07-14,0.013000
2022-11-30,0.166000
2023-10-31,0.126000
2023-12-29,0.146000
2013-12-13,9.332000
2019-10-10,0.333000
2020-04-30,0.100000
2021-04-30,0.178000
2025-05-30,0.195000