f/overrides/event-backup/bimbx-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,ctime
2019-12-30,0.028,2021-08-28 07:46:11
2018-08-21,0.0,2021-08-28 07:46:11
2020-12-30,0.064,2021-08-28 07:46:11
2015-10-15,0.026,2021-08-28 07:46:11
2016-10-13,0.032,2021-08-28 07:46:11
2017-10-12,0.046,2021-08-28 07:46:11
2018-10-11,0.07,2021-08-28 07:46:11
2019-10-10,0.048,2021-08-28 07:46:11
2016-07-21,0.022,2021-08-28 07:46:11
2017-07-20,0.055,2021-08-28 07:46:11
2018-07-19,0.078,2021-08-28 07:46:11
2019-07-18,0.053,2021-08-28 07:46:11
2020-07-16,0.04,2021-08-28 07:46:11
2018-12-28,0.071,2021-08-28 07:46:11
2015-12-23,0.086,2021-08-28 07:46:11
2016-12-22,0.047,2021-08-28 07:46:11
2017-12-21,0.065,2021-08-28 07:46:11
2019-04-10,0.056,2021-08-28 07:46:11
2020-04-08,0.028,2021-08-28 07:46:11
2016-04-13,0.062,2021-08-28 07:46:11
2017-04-12,0.055,2021-08-28 07:46:11
2018-04-11,0.067,2021-08-28 07:46:11
2015-07-16,0.005,2021-08-28 07:46:11