f/overrides/event-backup/igbh-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
2021-04-05,0.043000
2023-02-02,0.150000
2024-06-04,0.130000
2025-02-04,0.160000
2018-12-28,0.118000
2019-03-04,0.080000
2017-11-02,0.069000
2018-02-02,0.074000
2020-12-24,0.041000
2021-10-04,0.035000
2015-10-02,0.072000
2015-11-03,0.053000
2023-11-02,0.162000
2018-07-03,0.085000
2023-10-03,0.164000
2024-02-02,0.146000
2015-12-28,0.065000
2016-12-28,0.077000
2024-03-04,0.141000
2025-11-04,0.121000
2017-07-06,0.056000
2019-06-04,0.079000
2021-06-02,0.041000
2023-04-04,0.116000
2025-12-23,0.123000
2017-02-02,0.054000
2019-08-02,0.074000
2021-02-02,0.041000
2022-02-02,0.037000
2022-11-02,0.067000
2019-11-04,0.065000
2020-10-02,0.047000
2020-06-02,0.052000
2024-12-03,0.130000
2025-07-02,0.133000
2025-12-02,0.112000
2017-06-02,0.064000
2019-05-02,0.080000
2018-08-02,0.082000
2021-03-02,0.046000
2017-08-02,0.067000
2019-02-04,0.074000
2019-04-02,0.081000
2020-11-03,0.047000
2023-06-02,0.123000
2023-07-05,0.128000
2017-03-02,0.063000
2017-05-02,0.062000
2023-05-02,0.125000
2023-12-04,0.153000
2025-04-02,0.131000
2025-10-02,0.127000
2018-09-05,0.082000
2021-05-04,0.043000
2022-05-03,0.051000
2022-10-04,0.102000
2017-04-04,0.067000
2018-11-02,0.092000
2016-02-02,0.026000
2019-12-24,0.052000
2022-12-23,0.119000
2021-09-02,0.032000
2022-12-02,0.160000
2022-06-02,0.054000
2025-05-02,0.126000
2025-08-04,0.128000
2016-09-02,0.053000
2019-10-02,0.063000
2017-12-28,0.057000
2024-10-02,0.139000
2022-03-02,0.032000
2024-07-02,0.134000
2017-12-04,0.076000
2018-10-02,0.079000
2020-07-02,0.046000
2022-09-02,0.103000
2025-09-03,0.124000
2015-12-02,0.076000
2018-03-02,0.064000
2024-09-04,0.149000
2021-07-02,0.038000
2021-11-02,0.034000
2018-05-02,0.076000
2023-08-02,0.182000
2026-04-02,0.112000
2016-08-02,0.054000
2022-07-05,0.070000
2021-12-02,0.255000
2016-06-02,0.051000
2017-09-06,0.059000
2025-06-03,0.130000
2020-12-02,0.049000
2021-12-23,0.032000
2020-04-02,0.066000
2020-09-02,0.043000
2022-08-02,0.072000
2024-05-02,0.145000
2016-05-03,0.046000
2017-10-03,0.066000
2020-08-04,0.039000
2019-09-04,0.070000
2019-12-03,0.069000
2020-02-04,0.060000
2022-04-04,0.025000
2023-03-02,0.135000
2024-11-04,0.144000
2016-12-02,0.091000
2018-12-04,0.533000
2021-08-03,0.033000
2026-03-03,0.107000
2026-05-04,0.105000
2016-11-02,0.055000
2018-04-03,0.091000
2018-06-04,0.075000
2019-07-02,0.073000
2024-08-02,0.184000
2026-06-02,0.103000
2026-07-02,0.102000
2016-07-06,0.035000
2016-10-04,0.067000
2024-12-20,0.094000
2026-02-03,0.103000
2020-03-03,0.056000
2023-12-22,0.170000
2024-04-02,0.138000
2025-03-04,0.121000
2026-08-04,0.099000
2020-05-04,0.051000
2023-09-05,0.162000