f/overrides/event-backup/bil-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
2007-12-28,0.258000
2019-05-01,0.174000
2019-06-03,0.176000
2020-02-03,0.108000
2023-12-01,0.419000
2008-05-01,0.108000
2018-06-01,0.126000
2022-10-03,0.155000
2007-11-01,0.302000
2019-10-01,0.137000
2019-12-20,0.115000
2017-09-01,0.066000
2019-03-01,0.170000
2024-03-01,0.355000
2025-02-03,0.326000
2018-03-01,0.079000
2022-07-01,0.053000
2009-08-03,0.004000
2007-10-01,0.320000
2008-11-03,0.094000
2017-07-03,0.050000
2025-06-02,0.316000
2018-11-01,0.150000
2023-11-01,0.408000
2026-03-02,0.243000
2026-06-01,0.269000
2008-08-01,0.132000
2008-12-29,0.056000
2017-06-01,0.054000
2022-08-01,0.097000
2022-11-01,0.208000
2023-02-01,0.336000
2026-07-01,0.268000
2008-03-03,0.174000
2017-12-01,0.066000
2018-09-04,0.138000
2018-10-01,0.146000
2023-07-03,0.373000
2025-05-01,0.312000
2018-12-19,0.160000
2023-08-01,0.394000
2024-10-01,0.371000
2025-09-02,0.322000
2025-12-01,0.281000
2026-04-01,0.264000
2020-05-01,0.014000
2024-12-19,0.383000
2016-12-01,0.042000
2018-02-01,0.086000
2018-07-02,0.127000
2008-12-01,0.052000
2019-11-01,0.139000
2007-08-01,0.370000
2017-05-01,0.034000
2018-12-03,0.157000
2022-03-01,0.022000
2007-09-04,0.354000
2008-06-02,0.094000
2008-09-02,0.126000
2024-11-01,0.359000
2026-02-02,0.274000
2019-02-01,0.179000
2024-04-01,0.405000
2024-09-03,0.396000
2008-07-01,0.112000
2017-12-19,0.082000
2019-04-01,0.176000
2025-04-01,0.321000
2008-04-01,0.140000
2018-05-01,0.107000
2023-03-01,0.255000
2017-10-02,0.064000
2019-09-03,0.168000
2023-09-01,0.405000
2017-04-03,0.028000
2009-06-01,0.008000
2024-12-02,0.335000
2007-07-02,0.406000
2009-11-02,0.002000
2023-05-01,0.353000
2023-06-01,0.371000
2009-04-01,0.016000
2009-05-01,0.010000
2009-10-01,0.004000
2011-12-28,0.004000
2017-08-01,0.064000
2018-08-01,0.135000
2024-06-03,0.405000
2025-08-01,0.319000
2020-04-01,0.052000
2023-04-03,0.372000
2025-10-01,0.311000
2025-11-03,0.303000
2009-09-01,0.004000
2016-12-28,0.018000
2022-09-01,0.139000
2022-12-19,0.271000
2023-10-02,0.394000
2023-12-18,0.421000
2009-07-01,0.002000
2019-08-01,0.155000
2024-07-01,0.392000
2024-02-01,0.406000
2025-12-18,0.365000
2007-12-03,0.278000
2008-02-01,0.230000
2009-12-29,0.008000
2017-11-01,0.070000
2020-03-02,0.097000
2020-12-01,0.003000
2026-05-01,0.270000
2008-10-01,0.126000
2017-02-01,0.026000
2018-04-02,0.105000
2024-05-01,0.388000
2024-08-01,0.402000
2026-08-03,0.273000
2022-12-01,0.260000
2025-03-03,0.289000
2009-02-02,0.016000
2009-03-02,0.014000
2017-03-01,0.024000
2019-07-01,0.165000
2019-12-02,0.117000
2022-06-01,0.031000
2025-07-01,0.306000