f/overrides/event-backup/idmo-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
2014-06-20,0.581000
2019-06-24,0.214000
2024-03-18,0.303000
2025-03-24,0.224000
2014-03-21,0.010000
2013-06-21,0.200000
2016-06-17,0.226000
2018-03-19,0.098000
2018-12-24,0.268000
2020-12-21,0.144000
2025-09-22,0.173000
2012-09-21,0.069000
2015-03-20,0.030000
2016-12-16,0.132000
2019-12-23,0.110000
2022-03-21,0.235000
2013-09-20,0.164000
2016-03-18,0.117000
2017-09-18,0.171000
2021-03-22,0.150000
2021-06-21,0.138000
2023-09-18,0.325000
2025-06-23,0.430000
2015-09-18,0.122000
2019-03-18,0.128000
2019-09-23,0.134000
2020-03-23,0.200000
2022-12-19,0.121000
2023-06-20,0.207000
2024-06-24,0.234000
2026-06-22,0.517000
2015-06-19,0.306000
2013-12-20,0.132000
2015-12-18,0.130000
2016-09-16,0.016000
2017-03-17,0.231000
2022-09-19,0.370000
2013-03-15,0.010000
2012-12-21,0.234000
2020-06-22,0.098000
2022-06-21,0.434000
2023-03-20,0.404000
2024-09-23,0.277000
2024-12-23,0.096000
2025-12-22,1.236000
2012-06-15,0.220000
2026-03-23,0.266000
2017-12-18,0.189000
2018-06-18,0.379000
2021-12-20,0.218000
2023-12-18,0.128000
2017-06-16,0.277000