f/overrides/event-backup/ibdo-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
2022-03-01,0.035246
2015-08-03,0.061896
2017-07-03,0.062966
2017-09-01,0.062015
2018-10-01,0.063539
2018-12-18,0.057867
2021-09-01,0.036533
2021-11-01,0.034605
2023-05-01,0.072453
2015-06-01,0.062071
2015-12-01,0.062661
2019-12-02,0.062579
2020-09-01,0.052071
2020-12-01,0.047319
2021-10-01,0.036916
2022-11-01,0.043929
2019-08-01,0.065897
2015-07-01,0.061212
2015-09-01,0.062370
2015-10-01,0.062967
2017-10-02,0.061736
2017-12-01,0.060257
2017-12-21,0.042869
2018-02-01,0.059936
2019-12-19,0.059356
2020-11-02,0.048225
2023-04-03,0.066802
2023-08-01,0.087825
2018-04-02,0.061827
2018-11-01,0.066133
2020-12-17,0.046021
2021-07-01,0.038058
2016-04-01,0.067461
2016-08-01,0.064509
2016-09-01,0.063800
2016-11-01,0.062695
2017-04-03,0.063412
2019-07-01,0.063259
2019-10-01,0.063281
2022-04-01,0.032222
2022-06-01,0.033115
2016-06-01,0.066708
2017-03-01,0.063421
2017-05-01,0.063891
2018-07-02,0.061726
2022-09-01,0.039421
2016-10-03,0.062609
2018-05-01,0.061313
2019-03-01,0.066538
2021-12-01,0.035668
2022-10-03,0.042873
2023-10-02,0.093528
2023-11-01,0.107982
2017-02-01,0.062992
2017-06-01,0.062835
2017-11-01,0.060875
2021-03-01,0.042134
2016-12-22,0.041790
2018-09-04,0.059827
2018-12-03,0.065421
2019-04-01,0.066097
2020-03-02,0.059535
2022-12-01,0.047271
2023-06-01,0.078374
2016-03-01,0.065217
2018-06-01,0.066482
2019-02-01,0.067237
2020-06-01,0.057047
2020-07-01,0.054454
2022-05-02,0.033790
2022-12-15,0.048593
2015-05-01,0.092586
2015-11-02,0.062522
2019-09-03,0.063358
2020-02-03,0.060975
2020-10-01,0.050243
2021-02-01,0.045224
2023-07-03,0.087078
2015-12-24,0.049795
2018-08-01,0.063816
2019-05-01,0.064253
2019-11-01,0.063915
2021-06-01,0.038019
2022-07-01,0.036837
2023-02-01,0.055708
2016-12-01,0.062578
2021-12-16,0.035755
2023-03-01,0.060740
2016-07-01,0.065595
2019-06-03,0.063636
2020-04-01,0.061250
2021-08-02,0.037620
2022-02-01,0.032419
2023-09-01,0.092451
2016-02-01,0.059327
2016-05-02,0.061068
2017-08-01,0.061947
2020-08-03,0.052089
2021-04-01,0.040909
2021-05-03,0.040316
2022-08-01,0.037950
2023-12-01,0.110555
2018-03-01,0.061682
2020-05-01,0.058435