f/overrides/event-backup/ieih-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

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Date,Dividends,ctime
2018-06-26,0.087000,2021-12-20 13:20:52
2018-09-26,0.085000,2021-12-20 13:20:52
2018-12-17,0.230000,2021-12-20 13:20:52
2019-03-20,0.101000,2021-12-20 13:20:52
2019-06-17,0.083000,2021-12-20 13:20:52
2019-09-24,0.111000,2021-12-20 13:20:52
2019-09-24,0.111,2020-04-10 15:52:13
2018-09-26,0.085,2020-04-10 15:52:13
2019-12-16,0.582000,2021-12-20 13:20:52
2020-03-25,0.104000,2021-12-20 13:20:52
2020-03-25,0.104,2020-04-10 15:52:13
2018-06-26,0.087,2020-04-10 15:52:13
2019-03-20,0.101,2020-04-10 15:52:13
2018-12-17,0.23,2020-04-10 15:52:13
2019-06-17,0.083,2020-04-10 15:52:13
2019-12-16,0.582,2020-04-10 15:52:13
2020-06-15,0.063000,2021-12-20 13:20:52
2020-06-15,0.063,2020-07-09 10:54:47
2020-09-23,0.096000,2021-12-20 13:20:52
2020-09-23,0.096,2020-12-03 09:07:00
2018-06-26,0.087,2020-12-03 09:07:00
2019-03-20,0.101,2020-12-03 09:07:00
2018-12-17,0.23,2020-12-03 09:07:00
2019-06-17,0.083,2020-12-03 09:07:00
2019-12-16,0.582,2020-12-03 09:07:00
2020-06-15,0.063,2020-12-03 09:07:00
2020-12-14,0.757000,2021-12-20 13:20:52
2020-12-14,0.757,2021-03-01 22:16:32
2021-03-25,0.106000,2021-12-20 13:20:52
2021-03-25,0.106,2021-04-07 15:43:30
2018-06-26,0.087,2021-04-07 15:43:30
2019-03-20,0.101,2021-04-07 15:43:30
2018-12-17,0.23,2021-04-07 15:43:30
2019-06-17,0.083,2021-04-07 15:43:30
2019-09-24,0.111,2021-06-14 09:21:02
2018-09-26,0.085,2021-06-14 09:21:02
2019-12-16,0.582,2021-04-07 15:43:30
2020-06-15,0.063,2021-04-07 15:43:30
2020-09-23,0.096,2021-06-14 09:21:02
2020-12-14,0.757,2021-04-07 15:43:30
2021-06-10,0.086000,2021-12-20 13:20:52
2021-06-10,0.086,2021-06-14 09:21:02
2018-12-17,0.23,2021-06-14 09:21:02
2019-06-17,0.083,2021-06-14 09:21:02
2019-12-16,0.582,2021-06-14 09:21:02
2020-06-15,0.063,2021-06-14 09:21:02
2020-12-14,0.757,2021-06-14 09:21:02
2021-09-24,0.125000,2021-12-20 13:20:52
2021-09-24,0.125,2021-10-23 20:14:09
2021-06-10,0.086,2021-10-23 20:14:09
2018-12-17,0.23,2021-10-23 20:14:09
2019-06-17,0.083,2021-10-23 20:14:09
2019-12-16,0.582,2021-10-23 20:14:09
2020-06-15,0.063,2021-10-23 20:14:09
2020-12-14,0.757,2021-10-23 20:14:09
2021-12-13,0.510000,2021-12-20 13:20:52
2022-03-24,0.149000,2022-04-04 08:46:35