f/overrides/event-backup/czmvx-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

775 B

1DateDividends
22017-06-160.055000
32020-06-150.051000
42025-03-180.062000
52025-12-082.179000
62018-09-190.046000
72019-03-180.053000
82019-09-180.051000
92021-06-160.051000
102022-12-081.511000
112024-03-180.058000
122017-12-080.531000
132019-06-130.053000
142020-03-170.055000
152024-09-180.068000
162017-03-170.036000
172020-09-180.053000
182026-06-160.051000
192018-03-160.048000
202021-12-081.241000
212023-03-160.061000
222023-12-080.798000
232025-06-170.060000
242017-09-190.043000
252018-12-070.853000
262019-12-060.369000
272021-03-160.049000
282022-09-190.055000
292023-06-160.061000
302024-12-091.216000
312018-06-150.051000
322021-09-170.055000
332022-03-160.050000
342022-06-160.076000
352023-09-190.061000
362024-06-180.064000
372020-12-080.209000
382025-09-170.050000
392026-03-170.050000