f/overrides/event-backup/mcbzx-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

1.2 KiB

1DateDividends
22026-03-260.037000
32020-12-150.498000
42021-09-140.039000
52022-03-150.024000
62023-02-130.025000
72026-06-250.037000
82021-12-140.187000
92024-09-120.032000
102025-11-240.032000
112026-04-270.036000
122019-12-160.109000
132023-05-110.026000
142025-06-260.038000
152026-01-270.024000
162023-12-130.077000
172024-01-110.008000
182025-02-260.035000
192019-03-150.038000
202020-03-160.038000
212023-07-130.030000
222023-09-130.030000
232019-06-170.061000
242022-09-130.062000
252024-06-130.037000
262025-05-270.032000
272024-05-130.034000
282023-11-100.030000
292024-10-100.031000
302025-01-270.025000
312025-03-270.036000
322023-08-110.028000
332025-12-160.048000
342026-07-280.039000
352023-04-130.030000
362024-07-110.025000
372025-07-280.035000
382026-05-270.035000
392019-09-160.069000
402020-09-150.042000
412025-10-270.035000
422024-08-150.043000
432024-11-130.037000
442024-12-120.059000
452025-04-280.035000
462020-06-150.033000
472021-06-150.036000
482023-01-120.008000
492024-02-130.030000
502025-09-250.035000
512022-06-140.044000
522023-03-130.025000
532024-03-130.030000
542024-04-110.033000
552021-03-160.020000
562022-12-130.110000
572025-08-270.034000
582026-02-240.031000
592023-06-130.028000
602023-10-120.031000