f/overrides/event-backup/esg-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

815 B

1DateDividends
22021-12-170.356000
32023-03-170.244000
42021-06-180.324000
52025-09-190.381000
62023-09-150.303000
72024-09-200.411000
82016-09-190.163000
92020-09-180.279000
102023-06-160.342000
112025-12-190.467000
122026-03-200.281000
132017-03-200.143000
142018-03-190.198000
152021-03-190.239000
162019-09-200.274000
172022-12-160.381000
182019-06-210.293000
192020-06-190.277000
202021-09-170.277000
212022-03-180.282000
222022-06-170.296000
232017-12-210.320000
242018-06-180.274000
252019-03-150.251000
262022-09-160.305000
272024-06-210.413000
282019-12-230.346000
292020-03-200.307000
302020-12-180.353000
312023-12-150.391000
322024-03-150.290000
332016-12-220.322000
342017-06-190.523000
352017-09-180.245000
362025-03-210.262000
372025-06-200.410000
382026-06-180.408000
392018-09-240.296000
402018-12-210.257000
412024-12-200.511000