f/overrides/event-backup/cnssx-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

755 B

1DateDividends
22017-12-190.210000
32020-09-240.066000
42018-03-290.065000
52018-06-280.065000
62022-12-210.291000
72023-09-280.047000
82024-06-270.070000
92025-03-270.087000
102025-12-180.096000
112026-03-260.096000
122018-12-200.265000
132020-06-250.065000
142021-03-250.065000
152023-12-200.070000
162026-06-250.096000
172017-06-220.065000
182018-09-200.074000
192019-09-260.076000
202023-03-230.047000
212024-09-260.071000
222025-09-250.096000
232019-06-270.071000
242020-12-210.749000
252021-06-240.065000
262022-03-240.060000
272023-06-220.047000
282024-03-280.071000
292021-09-230.068000
302022-09-220.060000
312017-09-210.064000
322019-03-280.065000
332025-06-260.092000
342019-12-200.561000
352020-03-260.069000
362021-12-210.438000
372022-06-230.060000
382024-12-190.087000