f/overrides/event-backup/cdofx-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
2014-06-27,0.085000
2017-06-30,0.095000
2019-06-28,0.111000
2025-09-30,0.107000
2013-09-27,0.066000
2015-12-15,1.896000
2019-03-29,0.136000
2023-09-29,0.130000
2016-03-31,0.137000
2017-12-28,2.047000
2018-09-28,0.112000
2016-12-29,0.247000
2020-12-30,0.500000
2024-09-30,0.145000
2014-09-26,0.081000
2016-09-30,0.100000
2024-03-28,0.117000
2025-12-30,1.236000
2015-09-30,0.127000
2013-06-28,0.050000
2013-12-16,0.946000
2015-12-30,0.068000
2021-09-30,0.150000
2019-09-30,0.168000
2022-03-31,0.109000
2022-09-30,0.151000
2026-03-31,0.171000
2024-06-28,0.129000
2017-03-31,0.112000
2019-04-15,0.081000
2021-03-31,0.172000
2021-06-30,0.089000
2022-06-30,0.108000
2023-03-31,0.107000
2015-03-31,0.154000
2015-06-30,0.106000
2019-12-30,1.746000
2025-06-30,0.123000
2014-03-28,0.073000
2017-09-29,0.112000
2022-12-29,1.295000
2014-12-16,0.778000
2016-06-30,0.131000
2018-03-29,0.142000
2021-12-30,3.086000
2024-12-30,1.567000
2026-06-30,0.116000
2020-06-30,0.091000
2020-09-30,0.096000
2023-12-28,0.147000
2018-06-29,0.083000
2018-12-28,2.464000
2020-03-31,0.159000
2023-06-30,0.132000
2025-03-31,0.176000