f/overrides/event-backup/ewzs-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
22017-12-280.018000
32018-06-190.320000
42018-12-280.063000
52023-12-200.245000
62025-12-300.090000
72013-12-270.031000
82013-12-180.071000
92016-06-220.148000
102016-12-210.249000
112020-12-140.077000
122020-12-300.036000
132021-12-300.034000
142024-12-170.243000
152012-06-210.406000
162026-06-150.138000
172025-06-160.129000
182014-06-250.280000
192015-06-250.243000
202019-12-160.150000
212024-06-110.214000
222011-06-220.402000
232017-12-190.370000
242011-12-200.172000
252012-12-180.327000
262013-06-270.271000
272015-12-210.056000
282017-06-200.168000
292019-06-170.226000
302021-12-130.341000
312010-12-210.103000
322023-06-070.169000
332022-12-130.321000
342025-12-160.282000
352014-12-170.156000
362021-06-100.244000
372022-06-090.218000
382020-06-150.078000
392018-12-180.308000