f/overrides/event-backup/idog-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
2021-09-23,0.297000
2023-06-22,0.635000
2025-09-18,0.360000
2021-03-18,0.243000
2016-06-22,0.438000
2019-09-19,0.167000
2022-12-22,0.163000
2023-09-21,0.228000
2023-12-21,0.244000
2024-03-21,0.218000
2024-06-20,0.677000
2015-12-23,0.141000
2025-06-20,0.580000
2025-12-18,0.376000
2026-06-18,0.931000
2025-03-20,0.326000
2015-09-23,0.207000
2018-06-21,0.386000
2018-09-20,0.199000
2019-12-19,0.501000
2021-12-22,0.114000
2022-03-24,0.347000
2014-03-26,0.250000
2018-03-22,0.324000
2020-06-18,0.213000
2021-06-17,0.419000
2024-12-19,0.216000
2017-09-21,0.148000
2014-06-25,0.528000
2015-06-24,0.466000
2016-09-21,0.165000
2016-12-21,0.149000
2018-12-20,0.162000
2023-03-23,0.344000
2024-09-19,0.304000
2013-12-26,0.208000
2019-06-20,0.502000
2020-12-22,0.133000
2017-06-21,0.466000
2019-03-21,0.317000
2022-06-23,0.367000
2022-09-22,0.258000
2026-03-19,0.181000
2017-12-21,0.180000
2014-09-24,0.250000
2014-12-24,0.163000
2015-03-25,0.170000
2017-03-22,0.160000
2020-03-19,0.238000
2020-09-17,0.196000
2013-09-25,0.212000