f/overrides/event-backup/mxbsx-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

555 B

1DateDividends
22018-09-110.313000
32019-09-100.759000
42021-09-070.480000
52022-06-270.057000
62023-09-080.263000
72016-12-290.173000
82019-12-300.277000
92023-12-280.281000
102017-12-280.429000
112019-06-260.066000
122018-12-280.489000
132021-06-250.049000
142021-12-300.922000
152023-06-270.071000
162019-03-180.105000
172024-09-100.454000
182017-06-270.054000
192018-06-270.065000
202020-06-260.059000
212022-12-290.318000
222025-09-090.387000
232020-09-080.400000
242017-09-080.053000
252020-12-300.356000
262022-09-080.675000
272024-12-300.379000
282025-12-300.277000