f/overrides/event-backup/bndx-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
2014-09-02,0.064000
2019-10-01,0.052000
2020-04-01,0.051000
2025-02-03,0.103000
2016-06-01,0.055000
2022-04-01,0.038000
2022-05-02,0.038000
2025-12-01,0.104000
2013-10-01,0.069000
2017-08-01,0.048000
2021-07-01,0.042000
2023-05-01,0.070000
2023-12-01,0.087000
2017-06-01,0.047000
2019-12-23,1.352000
2021-08-02,0.041000
2023-08-01,0.082000
2025-04-01,0.108000
2026-02-02,0.112000
2015-11-02,0.081000
2016-10-03,0.056000
2018-04-02,0.052000
2025-06-02,0.107000
2025-07-01,0.104000
2025-10-01,0.105000
2019-12-02,0.050000
2024-07-01,0.093000
2024-09-03,0.101000
2024-12-02,0.098000
2018-11-01,0.054000
2020-10-01,0.046000
2022-07-01,0.043000
2016-11-01,0.061000
2017-05-01,0.046000
2018-05-01,0.043000
2014-08-01,0.075000
2015-04-01,0.056000
2019-04-01,0.053000
2020-09-01,0.047000
2021-02-01,0.045000
2021-12-01,0.034000
2021-06-01,0.041000
2014-12-01,0.085000
2015-12-01,0.110000
2016-05-02,0.056000
2016-07-01,0.056000
2016-12-01,0.066000
2019-09-03,0.053000
2020-07-01,0.047000
2015-02-02,0.072000
2019-07-01,0.055000
2022-02-01,0.047000
2024-11-01,0.098000
2013-09-03,0.049000
2015-09-01,0.057000
2016-09-01,0.056000
2021-09-01,0.040000
2021-11-01,0.039000
2022-08-01,0.049000
2026-06-01,0.114000
2017-07-03,0.049000
2020-03-02,0.044000
2022-09-01,0.048000
2023-10-02,0.079000
2023-11-01,0.084000
2025-03-03,0.095000
2016-04-01,0.056000
2021-05-03,0.039000
2022-12-01,0.060000
2025-08-01,0.107000
2015-07-01,0.062000
2017-03-01,0.046000
2017-04-03,0.046000
2018-08-01,0.050000
2018-12-24,1.094000
2019-06-03,0.054000
2017-10-02,0.049000
2021-03-01,0.045000
2024-04-01,0.091000
2026-03-02,0.100000
2014-03-03,0.060000
2016-03-01,0.055000
2018-09-04,0.051000
2020-11-02,0.047000
2023-12-22,1.357000
2025-09-02,0.109000
2026-08-03,0.119000
2018-02-01,0.049000
2014-04-01,0.065000
2014-06-02,0.060000
2014-10-01,0.055000
2015-03-02,0.062000
2015-06-01,0.051000
2017-02-01,0.045000
2017-12-26,0.691000
2021-12-23,1.618000
2025-11-03,0.109000
2014-11-03,0.074000
2018-10-01,0.050000
2020-12-01,0.045000
2020-12-23,0.136000
2021-04-01,0.041000
2023-06-01,0.073000
2026-04-01,0.112000
2023-07-03,0.078000
2014-02-03,0.059000
2014-07-01,0.059000
2014-12-23,0.093000
2022-06-01,0.042000
2025-12-18,0.969000
2017-11-01,0.048000
2018-07-02,0.048000
2019-02-01,0.054000
2019-05-01,0.051000
2013-07-01,0.054000
2015-08-03,0.051000
2019-08-01,0.054000
2020-08-03,0.048000
2022-03-01,0.035000
2023-02-01,0.063000
2013-11-01,0.064000
2016-08-01,0.050000
2018-12-03,0.052000
2019-03-01,0.046000
2020-02-03,0.045000
2024-02-01,0.086000
2019-11-01,0.052000
2020-06-01,0.048000
2023-04-03,0.072000
2024-05-01,0.089000
2024-12-24,1.014000
2026-07-01,0.111000
2013-08-01,0.070000
2014-05-01,0.068000
2017-12-01,0.048000
2024-08-01,0.101000
2017-09-01,0.049000
2023-03-01,0.059000
2025-05-01,0.104000
2021-10-01,0.038000
2013-12-02,0.050000
2015-05-01,0.061000
2015-10-01,0.062000
2015-12-23,0.135000
2016-02-01,0.056000
2016-12-22,0.404000
2018-06-01,0.047000
2022-11-01,0.054000
2023-09-01,0.079000
2013-12-24,0.073000
2018-03-01,0.043000
2020-05-01,0.047000
2022-10-03,0.050000
2024-10-01,0.097000
2026-05-01,0.113000
2022-12-23,0.215000
2024-03-01,0.085000
2024-06-03,0.096000