f/overrides/event-backup/cusix-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

695 B

1DateDividends
22020-12-220.022000
32021-09-290.009000
42021-12-221.726000
52023-12-210.163000
62011-06-290.034000
72015-12-300.315000
82026-06-290.043000
92016-09-290.011000
102022-06-290.088000
112023-03-300.030000
122024-09-270.046000
132025-09-290.082000
142014-12-302.044000
152022-09-290.049000
162019-09-270.021000
172013-12-300.225000
182016-12-290.084000
192012-12-280.283000
202017-12-282.445000
212018-12-200.612000
222022-03-300.030000
232010-12-300.109000
242011-12-290.309000
252024-03-270.063000
262024-06-270.055000
272024-12-190.608000
282026-03-300.003000
292020-09-290.007000
302023-09-280.051000
312025-12-180.064000
322019-12-200.346000
332022-12-221.012000
342009-12-300.013000
352012-06-280.030000