f/overrides/event-backup/nmai-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

615 B

1DateDividends
22023-09-140.300000
32024-06-140.418000
42025-08-150.126000
52025-09-150.126000
62026-08-140.116000
72022-06-140.350000
82023-12-140.400000
92024-12-130.418000
102025-07-150.126000
112022-10-140.835000
122025-11-140.126000
132026-03-130.116000
142022-03-140.350000
152022-12-140.350000
162024-03-140.400000
172024-09-130.418000
182026-04-150.116000
192026-06-150.116000
202026-05-150.116000
212021-12-140.350000
222023-03-140.300000
232025-10-150.126000
242026-01-150.116000
252026-07-150.116000
262022-09-140.350000
272023-06-140.300000
282025-03-140.418000
292025-06-130.126000
302025-12-150.116000
312026-02-130.116000