f/overrides/event-backup/lsbnx-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
2014-10-24,0.049000
2015-03-25,0.026000
2017-06-27,0.025000
2024-07-26,0.048000
2025-11-26,0.034000
2016-10-25,0.040000
2017-04-27,0.030000
2017-07-27,0.033000
2017-09-26,0.033000
2022-10-28,0.039000
2026-01-28,0.053000
2018-02-27,0.032000
2018-04-27,0.040000
2019-05-28,0.038000
2019-11-27,0.036000
2020-02-27,0.035000
2016-05-24,0.023000
2019-02-27,0.038000
2022-09-28,0.035000
2025-10-27,0.042000
2026-03-27,0.053000
2015-06-23,0.030000
2015-09-24,0.021000
2015-11-24,0.021000
2015-12-17,0.615000
2024-02-27,0.047000
2024-11-26,0.053000
2015-07-24,0.032000
2017-08-28,0.036000
2022-03-28,0.043000
2022-11-29,0.041000
2014-11-24,0.054000
2018-11-29,0.040000
2020-09-28,0.038000
2021-07-29,0.034000
2025-04-25,0.050000
2017-05-30,0.032000
2020-04-27,0.035000
2023-10-30,0.054000
2025-12-16,0.050000
2016-02-26,0.014000
2017-12-15,0.450000
2019-04-29,0.050000
2021-03-26,0.036000
2023-01-30,0.039000
2023-03-28,0.046000
2015-05-22,0.033000
2022-01-28,0.031000
2024-05-28,0.055000
2019-08-28,0.037000
2023-08-30,0.053000
2015-08-24,0.034000
2016-08-23,0.011000
2017-02-27,0.030000
2018-08-29,0.033000
2016-04-25,0.015000
2016-12-16,0.219000
2019-07-30,0.051000
2023-12-15,0.089000
2016-09-23,0.004000
2024-01-30,0.049000
2024-06-27,0.052000
2017-10-27,0.042000
2019-06-27,0.034000
2019-09-26,0.034000
2020-01-29,0.041000
2026-05-27,0.053000
2021-08-30,0.032000
2022-05-27,0.034000
2015-01-28,0.049000
2018-01-30,0.043000
2025-06-26,0.053000
2025-08-25,0.039000
2026-06-26,0.053000
2015-02-25,0.046000
2018-05-29,0.041000
2019-01-30,0.052000
2019-10-28,0.050000
2021-02-25,0.029000
2025-07-25,0.053000
2017-03-28,0.028000
2019-03-28,0.040000
2021-04-26,0.035000
2021-06-28,0.034000
2025-01-29,0.046000
2025-09-25,0.042000
2023-06-28,0.042000
2015-04-23,0.031000
2018-09-27,0.028000
2024-09-26,0.051000
2023-02-27,0.038000
2025-03-27,0.053000
2018-12-14,0.091000
2020-05-27,0.028000
2020-07-28,0.043000
2020-08-28,0.036000
2021-05-27,0.032000
2021-12-17,0.035000
2014-12-16,0.505000
2021-09-28,0.031000
2021-10-28,0.030000
2016-07-25,0.017000
2020-12-16,0.136000
2022-12-19,0.188000
2025-05-27,0.056000
2016-03-28,0.021000
2020-10-27,0.048000
2023-07-28,0.048000
2024-03-27,0.053000
2024-04-26,0.052000
2024-12-16,0.094000
2018-03-28,0.034000
2015-10-26,0.023000
2017-01-30,0.039000
2018-07-30,0.037000
2022-04-27,0.034000
2023-09-28,0.047000
2016-11-28,0.038000
2018-06-28,0.033000
2022-06-28,0.040000
2023-11-29,0.050000
2026-02-26,0.053000
2023-04-27,0.043000
2023-05-30,0.050000
2016-01-28,0.017000
2018-10-30,0.047000
2020-03-27,0.030000
2020-11-25,0.035000
2021-01-28,0.037000
2021-11-29,0.034000
2025-02-27,0.049000
2016-06-23,0.016000
2022-07-28,0.036000
2024-10-25,0.049000
2026-07-27,0.053000
2026-04-27,0.053000
2017-11-28,0.038000
2019-12-16,0.082000
2020-06-26,0.024000
2022-02-25,0.031000
2022-08-30,0.038000
2024-08-26,0.050000