f/overrides/event-backup/ismd-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
22025-06-260.117000
32025-12-170.101000
42020-03-270.112000
52021-12-143.009000
62022-12-140.024000
72025-09-260.115000
82020-09-250.072000
92021-03-260.099000
102021-09-240.093000
112019-06-270.078000
122022-03-250.104000
132022-09-230.100000
142021-06-250.089000
152023-09-220.109000
162017-12-150.421000
172018-09-260.068000
182020-12-140.029000
192019-09-260.071000
202020-06-260.083000
212021-12-290.005000
222023-03-270.110000
232023-12-140.089000
242018-03-280.028000
252018-06-270.076000
262019-03-280.047000
272024-03-270.124000
282023-06-230.098000
292024-09-250.123000
302025-03-270.134000
312026-03-270.111000
322026-06-260.223000
332017-06-160.055000
342018-12-140.588000
352022-06-240.158000
362017-09-180.055000
372019-12-130.050000
382024-06-250.141000
392024-12-160.077000