f/overrides/event-backup/nflt-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
2020-07-20,0.075000
2021-09-20,0.070000
2022-07-20,0.072000
2026-04-20,0.102000
2019-03-20,0.085000
2025-02-20,0.114000
2026-05-20,0.097000
2026-07-20,0.093000
2016-05-20,0.085000
2017-12-20,0.579000
2020-01-21,0.056000
2022-02-22,0.078000
2023-01-20,0.079000
2023-10-20,0.114000
2026-08-20,0.093000
2017-09-20,0.093000
2018-07-20,0.099000
2021-11-22,0.075000
2026-02-20,0.100000
2026-03-20,0.090000
2017-01-20,0.050000
2016-01-20,0.040000
2024-09-20,0.108000
2025-03-20,0.105000
2026-06-22,0.106000
2021-10-20,0.077000
2020-08-20,0.081000
2021-04-20,0.063000
2021-05-20,0.072000
2023-07-20,0.108000
2026-01-20,0.061000
2019-05-20,0.154000
2018-03-20,0.085000
2017-07-20,0.096000
2017-02-22,0.093000
2017-04-20,0.101000
2017-05-22,0.094000
2019-01-22,0.054000
2020-06-22,0.082000
2016-09-20,0.087000
2025-05-20,0.110000
2025-07-21,0.105000
2016-07-20,0.099000
2018-04-20,0.103000
2022-05-20,0.072000
2023-04-20,0.109000
2023-12-20,0.147000
2017-11-20,0.101000
2019-09-20,0.085000
2024-11-20,0.111000
2019-08-20,0.088000
2019-11-20,0.052000
2025-06-20,0.108000
2019-04-22,0.089000
2024-10-21,0.096000
2025-01-21,0.066000
2021-03-22,0.069000
2021-07-20,0.069000
2016-10-20,0.090000
2020-09-21,0.093000
2020-12-21,0.113000
2019-10-21,0.078000
2015-12-21,0.083000
2020-11-20,0.043000
2021-12-20,0.093000
2022-11-21,0.083000
2023-11-20,0.151000
2024-05-20,0.103000
2025-12-22,0.148000
2015-09-21,0.006000
2022-10-20,0.088000
2018-10-22,0.098000
2018-12-20,0.093000
2017-03-20,0.075000
2016-06-20,0.084000
2024-02-21,0.109000
2019-06-20,0.090000
2018-08-21,0.096000
2018-11-20,0.118000
2021-02-22,0.078000
2022-04-20,0.069000
2022-08-22,0.070000
2024-06-20,0.113000
2018-01-22,0.066000
2020-03-20,0.082000
2022-09-20,0.072000
2023-02-21,0.121000
2023-05-22,0.106000
2025-08-20,0.110000
2016-11-21,0.097000
2021-08-20,0.069000
2022-01-20,0.044000
2022-12-20,0.118000
2024-12-20,0.149000
2021-01-20,0.045000
2024-03-20,0.089000
2024-07-22,0.110000
2024-01-22,0.083000
2020-04-20,0.076000
2025-10-20,0.104000
2016-12-20,0.443000
2016-08-22,0.100000
2018-05-22,0.102000
2018-06-20,0.092000
2019-12-20,0.116000
2020-10-19,0.070000
2023-06-20,0.098000
2023-08-21,0.113000
2015-11-20,0.053000
2025-09-22,0.106000
2025-04-21,0.117000
2019-02-20,0.094000
2019-07-22,0.084000
2023-09-20,0.111000
2024-08-20,0.108000
2017-08-21,0.099000
2017-10-20,0.093000
2018-09-20,0.092000
2022-03-21,0.062000
2025-11-20,0.129000
2017-06-20,0.096000
2024-04-22,0.116000
2016-02-22,0.070000
2021-06-21,0.075000
2022-06-21,0.081000
2023-03-20,0.093000
2018-02-21,0.083000