f/overrides/event-backup/cdoyx-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

955 B

1DateDividends
22023-03-200.289000
32014-12-165.692000
42015-12-141.124000
52016-09-220.388000
62018-12-133.356000
72022-03-180.301000
82017-06-210.380000
92023-06-210.303000
102024-09-200.287000
112026-06-180.272000
122019-03-200.296000
132020-06-170.316000
142020-12-110.607000
152015-09-220.360000
162016-03-230.352000
172016-12-140.484000
182017-09-210.380000
192018-03-210.312000
202022-06-210.277000
212025-03-200.289000
222016-06-230.372000
232017-12-133.612000
242020-03-200.320000
252021-12-144.176000
262025-06-200.316000
272018-06-210.352000
282019-09-200.328000
292024-06-210.299000
302026-03-190.293000
312024-12-122.258000
322015-03-200.336000
332017-03-220.376000
342020-09-220.314000
352021-06-180.270000
362022-12-131.984000
372025-09-190.293000
382025-12-112.458000
392021-09-210.291000
402022-09-210.287000
412023-09-210.267000
422023-12-130.577000
432024-03-200.273000
442015-06-220.352000
452018-09-210.356000
462019-06-170.300000
472019-12-133.656000
482021-03-180.275000