f/overrides/event-backup/cemgx-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

895 B

1DateDividends
22026-06-290.090000
32012-12-280.022000
42014-06-270.071000
52017-09-280.174000
62018-06-280.050000
72013-09-270.070000
82018-03-280.016000
92019-09-270.128000
102020-03-300.016000
112020-06-290.069000
122023-12-210.145000
132026-03-300.037000
142013-06-270.051000
152014-03-280.007000
162018-09-270.147000
172022-12-220.028000
182024-06-270.081000
192024-09-270.163000
202024-12-190.079000
212025-06-270.049000
222016-06-290.062000
232017-06-290.076000
242019-06-270.094000
252022-06-290.149000
262019-03-280.060000
272019-12-200.068000
282021-06-290.086000
292023-06-290.155000
302014-12-300.031000
312015-06-290.070000
322015-09-290.270000
332016-12-290.097000
342023-09-280.123000
352023-03-300.026000
362014-09-290.158000
372016-09-290.104000
382017-12-280.069000
392021-03-300.013000
402025-09-290.078000
412025-12-300.014000
422020-09-290.070000
432021-09-290.124000
442022-03-300.045000
452022-09-290.151000