f/overrides/event-backup/cyyyx-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

495 B

1DateDividends
22024-12-200.518000
32015-12-220.308000
42016-06-070.321000
52018-12-210.602000
62021-12-222.236000
72024-06-120.064000
82025-06-100.083000
92015-06-030.302000
102017-12-210.475000
112021-06-100.252000
122020-12-211.056000
132022-12-210.333000
142023-06-140.026000
152023-12-210.405000
162025-12-190.530000
172016-12-220.071000
182017-06-010.293000
192019-12-200.725000
202026-06-100.079000
212020-06-100.203000
222022-06-080.143000
232014-12-220.464000
242018-06-120.203000
252019-06-120.117000