f/overrides/event-backup/nwxgx-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
2019-05-23,0.030000
2019-07-25,0.030000
2020-06-25,0.010000
2021-12-29,0.010000
2023-06-12,0.056000
2024-03-11,0.104000
2026-05-20,0.015000
2026-06-17,0.069000
2017-10-26,0.040000
2018-04-26,0.030000
2018-06-28,0.030000
2019-10-24,0.030000
2016-06-28,0.047000
2016-10-27,0.041000
2016-12-16,0.318000
2017-08-29,0.040000
2017-11-28,0.040000
2018-01-25,0.030000
2018-08-30,0.030000
2019-04-25,0.030000
2020-04-23,0.010000
2025-03-10,0.143000
2025-12-18,0.103000
2015-11-24,0.010000
2018-07-26,0.030000
2019-09-26,0.031000
2019-11-21,0.030000
2020-07-23,0.011000
2020-08-27,0.010000
2020-11-19,0.010000
2025-11-18,0.031000
2021-10-21,0.010000
2016-05-26,0.044000
2016-08-29,0.042000
2016-09-28,0.035000
2017-03-29,0.040000
2018-09-27,0.030000
2026-02-18,0.030000
2016-02-25,0.041000
2016-07-27,0.053000
2017-01-26,0.040000
2017-09-27,0.040000
2018-05-24,0.030000
2018-11-29,0.030000
2021-01-21,0.041000
2021-05-27,0.021000
2021-07-29,0.021000
2022-03-07,0.116000
2023-09-11,0.133000
2023-12-20,0.196000
2023-03-13,0.064000
2026-04-15,0.040000
2017-02-23,0.040000
2017-06-28,0.040000
2018-10-25,0.029000
2018-12-18,0.119000
2020-01-23,0.030000
2020-12-21,0.333000
2021-03-25,0.040000
2021-11-18,0.011000
2026-03-18,0.070000
2019-02-21,0.030000
2019-03-28,0.028000
2020-02-20,0.050000
2016-01-28,0.021000
2018-02-22,0.030000
2019-01-24,0.030000
2020-09-24,0.010000
2020-10-22,0.010000
2021-08-26,0.021000
2025-10-14,0.034000
2018-03-29,0.034000
2019-12-18,0.068000
2021-06-24,0.023000
2022-06-06,0.071000
2022-12-21,0.750000
2025-09-08,0.116000
2019-12-27,0.022000
2022-09-12,0.073000
2025-06-09,0.113000
2016-03-29,0.041000
2017-05-25,0.040000
2017-12-18,0.457000
2019-06-27,0.030000
2020-03-26,0.023000
2024-06-10,0.071000
2026-07-15,0.011000
2016-04-27,0.035000
2017-04-26,0.040000
2019-08-29,0.030000
2021-09-23,0.020000
2015-12-17,0.040000
2016-11-29,0.040000
2017-07-27,0.040000
2020-05-28,0.010000
2021-02-25,0.040000
2021-04-29,0.041000
2021-12-21,0.152000
2024-09-09,0.204000
2024-12-19,0.141000
2026-01-21,0.031000