f/overrides/event-backup/mampx-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

395 B

1DateDividends
22021-12-281.114000
32023-06-220.066000
42024-03-260.064000
52024-06-250.090000
62025-06-260.086000
72022-03-240.031000
82022-06-230.066000
92022-09-220.080000
102025-09-250.102000
112022-12-280.605000
122023-09-210.094000
132023-12-270.612000
142025-12-231.367000
152026-06-250.086000
162023-03-230.044000
172024-09-260.119000
182024-12-261.129000
192025-03-250.066000
202026-03-260.066000