f/overrides/event-backup/ftsd-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
2026-07-01,0.304000
2016-11-30,0.184000
2022-07-01,0.094000
2025-02-03,0.411000
2025-12-01,0.290000
2016-01-29,0.080000
2017-07-31,0.187000
2024-07-01,0.330000
2026-04-01,0.326000
2015-02-27,0.088000
2016-08-31,0.209000
2017-01-31,0.105000
2017-09-29,0.156000
2020-10-30,0.120000
2025-03-03,0.312000
2016-05-31,0.172000
2016-12-28,0.224000
2018-03-29,0.206000
2021-04-30,0.080000
2023-10-02,0.326000
2024-03-01,0.341000
2018-04-30,0.169000
2020-05-29,0.106000
2016-10-31,0.147000
2018-02-28,0.167000
2019-04-30,0.227000
2013-11-29,0.117000
2014-06-30,0.149000
2014-09-30,0.142000
2018-07-31,0.234000
2019-03-29,0.308000
2021-07-30,0.073000
2021-10-29,0.067000
2021-12-01,0.067000
2022-06-01,0.071000
2017-06-30,0.170000
2020-12-30,0.116000
2022-09-01,0.188000
2015-11-30,0.113000
2016-07-29,0.193000
2020-04-30,0.099000
2016-06-30,0.118000
2017-08-31,0.196000
2018-10-31,0.219000
2019-12-30,0.237000
2020-11-30,0.099000
2021-03-31,0.137000
2023-08-01,0.307000
2024-02-01,0.356000
2024-09-03,0.359000
2026-02-02,0.303000
2013-12-27,0.156000
2015-01-30,0.091000
2016-09-30,0.142000
2017-03-31,0.221000
2019-02-28,0.199000
2022-02-01,0.058000
2022-11-01,0.193000
2023-12-01,0.325000
2024-06-03,0.367000
2017-04-28,0.171000
2018-01-31,0.142000
2020-09-30,0.115000
2024-05-01,0.390000
2014-10-31,0.146000
2017-12-28,0.223000
2018-12-28,0.250000
2020-03-31,0.161000
2020-06-30,0.099000
2020-07-31,0.112000
2023-04-03,0.285000
2023-07-03,0.313000
2024-11-01,0.392000
2014-03-31,0.186000
2017-10-31,0.195000
2019-01-31,0.208000
2024-12-13,0.359000
2025-11-03,0.387000
2014-12-29,0.156000
2015-03-31,0.104000
2020-08-31,0.106000
2021-08-31,0.086000
2023-02-01,0.239000
2025-06-02,0.349000
2026-05-01,0.339000
2022-10-03,0.173000
2015-05-29,0.151000
2015-12-29,0.182000
2018-11-30,0.224000
2019-08-30,0.203000
2023-03-01,0.239000
2026-03-02,0.299000
2019-11-29,0.179000
2021-02-26,0.086000
2021-12-17,0.066000
2023-12-15,0.371000
2025-07-01,0.323000
2014-04-30,0.173000
2014-07-31,0.181000
2015-09-30,0.139000
2021-01-29,0.081000
2022-12-01,0.226000
2024-10-01,0.352000
2014-02-28,0.148000
2022-05-02,0.068000
2025-08-01,0.385000
2025-12-19,0.412000
2015-08-31,0.124000
2019-05-31,0.296000
2020-02-28,0.168000
2022-04-01,0.077000
2022-08-01,0.101000
2025-05-01,0.367000
2019-06-28,0.201000
2022-03-01,0.056000
2023-09-01,0.343000
2023-11-01,0.371000
2018-05-31,0.226000
2014-11-28,0.137000
2015-07-31,0.131000
2019-10-31,0.223000
2024-04-01,0.340000
2024-12-02,0.295000
2014-05-30,0.169000
2015-06-30,0.069000
2017-11-30,0.213000
2018-06-29,0.209000
2019-09-30,0.203000
2017-02-28,0.142000
2017-05-31,0.167000
2020-01-31,0.177000
2021-05-28,0.055000
2023-05-01,0.267000
2023-06-01,0.342000
2025-04-01,0.342000
2021-09-30,0.071000
2022-12-16,0.247000
2025-10-01,0.344000
2014-01-31,0.156000
2014-08-29,0.155000
2018-08-31,0.248000
2018-09-28,0.202000
2019-07-31,0.248000
2021-06-30,0.077000
2024-08-01,0.404000
2025-09-02,0.330000
2026-06-01,0.324000
2026-08-03,0.337000