f/overrides/event-backup/icvt-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
2015-11-02,0.065000
2017-12-01,0.276000
2019-06-03,0.074000
2023-03-01,0.064000
2018-10-01,0.074000
2020-06-01,0.068000
2021-05-03,0.059000
2018-03-01,0.099000
2020-02-03,0.087000
2023-05-01,0.061000
2023-09-01,0.102000
2015-10-01,0.065000
2016-10-03,0.189000
2017-04-03,0.081000
2017-09-01,0.113000
2024-09-03,0.153000
2020-09-01,0.064000
2023-06-01,0.081000
2025-11-03,0.114000
2026-05-01,0.122000
2018-05-01,0.089000
2018-08-01,0.069000
2019-10-01,0.076000
2021-04-01,0.058000
2025-12-19,0.218000
2015-08-03,0.056000
2018-09-04,0.072000
2022-03-01,0.061000
2024-07-01,0.156000
2021-07-01,0.059000
2024-02-01,0.120000
2019-08-01,0.074000
2016-09-01,0.242000
2018-07-02,0.072000
2020-12-01,2.822000
2025-12-01,0.117000
2016-12-01,0.077000
2019-02-01,0.082000
2022-05-02,0.073000
2024-06-03,0.154000
2024-12-18,0.280000
2019-07-01,0.081000
2019-12-02,0.082000
2022-09-01,0.114000
2024-03-01,0.129000
2024-08-01,0.150000
2016-07-01,0.150000
2016-11-01,0.076000
2019-05-01,0.078000
2021-03-01,0.058000
2023-12-14,0.372000
2017-05-01,0.082000
2017-06-01,0.084000
2019-03-01,0.075000
2021-06-01,0.064000
2023-12-01,0.154000
2020-11-02,0.070000
2021-10-01,0.060000
2022-08-01,0.143000
2024-11-01,0.142000
2016-02-01,0.065000
2017-08-01,0.098000
2018-04-02,0.107000
2019-11-01,0.079000
2017-10-02,0.109000
2021-08-02,0.059000
2023-11-01,0.117000
2026-03-02,0.130000
2026-02-02,0.107000
2016-12-22,0.219000
2022-12-01,0.114000
2025-04-01,0.147000
2025-06-02,0.150000
2025-10-01,0.130000
2017-11-01,0.091000
2017-12-21,0.213000
2019-12-19,0.302000
2021-02-01,0.063000
2017-07-03,0.106000
2018-06-01,0.079000
2021-11-01,0.059000
2019-04-01,0.080000
2024-04-01,0.135000
2026-07-01,0.120000
2023-02-01,0.142000
2023-07-03,0.079000
2025-05-01,0.152000
2016-06-01,0.062000
2018-11-01,0.079000
2020-05-01,0.074000
2020-07-01,0.066000
2016-08-01,0.223000
2020-03-02,0.081000
2023-08-01,0.086000
2015-12-24,0.358000
2021-12-16,0.361000
2024-05-01,0.141000
2016-05-02,0.057000
2026-08-03,0.139000
2022-07-01,0.115000
2024-12-02,0.147000
2025-02-03,0.141000
2025-09-02,0.136000
2015-09-01,0.061000
2017-03-01,0.076000
2018-12-03,1.066000
2020-04-01,0.079000
2026-04-01,0.134000
2021-12-01,5.911000
2025-03-03,0.147000
2025-07-01,0.137000
2017-02-01,0.080000
2022-11-01,0.119000
2015-12-01,0.063000
2022-02-01,0.059000
2022-04-01,0.073000
2022-10-03,0.111000
2026-06-01,0.130000
2018-02-01,0.080000
2019-09-03,0.081000
2020-08-03,0.070000
2024-10-01,0.151000
2022-06-01,0.069000
2023-04-03,0.070000
2022-12-15,0.288000
2023-10-02,0.120000
2025-08-01,0.115000
2018-12-18,0.647000
2020-10-01,0.065000
2020-12-17,0.296000
2021-09-01,0.056000