f/overrides/event-backup/ibdq-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
2024-07-01,0.080113
2025-02-03,0.082957
2015-11-02,0.069740
2016-04-01,0.073117
2016-11-01,0.070087
2019-12-19,0.066418
2022-12-01,0.054924
2023-05-01,0.065533
2017-12-01,0.069048
2018-09-04,0.067275
2019-11-01,0.067213
2023-02-01,0.061149
2021-10-01,0.041778
2025-06-02,0.086810
2016-02-01,0.069851
2018-04-02,0.069362
2023-03-01,0.062761
2023-12-14,0.074600
2020-06-01,0.057082
2021-08-02,0.041615
2015-12-01,0.069790
2018-02-01,0.067823
2019-07-01,0.071218
2022-04-01,0.039476
2023-09-01,0.067103
2024-06-03,0.078747
2020-05-01,0.062147
2022-07-01,0.041090
2023-08-01,0.068292
2024-02-01,0.074593
2016-09-01,0.070043
2020-09-01,0.052466
2022-06-01,0.040529
2022-12-15,0.053664
2023-04-03,0.062985
2015-06-01,0.067620
2016-10-03,0.069842
2018-03-01,0.069488
2020-12-01,0.066823
2020-12-17,0.046157
2021-12-01,0.079420
2019-09-03,0.069134
2021-06-01,0.041750
2024-12-18,0.082683
2025-07-01,0.088370
2018-12-18,0.068903
2021-02-01,0.046393
2023-06-01,0.066384
2015-05-01,0.100585
2021-07-01,0.042232
2024-04-01,0.078593
2025-11-03,0.087464
2016-06-01,0.071610
2016-12-22,0.053467
2019-12-02,0.066464
2022-08-01,0.044190
2020-04-01,0.066172
2022-11-01,0.051728
2017-03-01,0.069386
2018-05-01,0.066426
2019-04-01,0.070628
2024-08-01,0.080870
2025-08-01,0.087767
2015-07-01,0.067761
2015-08-03,0.069031
2021-09-01,0.040695
2022-10-03,0.050693
2024-10-01,0.080259
2015-09-01,0.070497
2016-05-02,0.067114
2016-12-01,0.068060
2018-07-02,0.070169
2024-03-01,0.077870
2015-12-24,0.047229
2017-08-01,0.070220
2019-05-01,0.070086
2023-11-01,0.070723
2025-03-03,0.083336
2017-12-21,0.050673
2018-08-01,0.069635
2019-06-03,0.070942
2021-04-01,0.043278
2022-09-01,0.046313
2017-07-03,0.071087
2018-06-01,0.070383
2018-10-01,0.069904
2020-11-02,0.050504
2022-02-01,0.038725
2025-10-01,0.086073
2016-07-01,0.071499
2017-10-02,0.069774
2022-05-02,0.040608
2023-10-02,0.067059
2024-12-02,0.080699
2025-12-01,0.084725
2016-08-01,0.069947
2021-05-03,0.043411
2021-11-01,0.039602
2020-07-01,0.057013
2020-10-01,0.052202
2021-03-01,0.046133
2024-11-01,0.079773
2019-08-01,0.070755
2020-08-03,0.054175
2015-10-01,0.070879
2017-02-01,0.070432
2017-06-01,0.070531
2018-11-01,0.070501
2018-12-03,0.071112
2019-02-01,0.072315
2021-12-16,0.039388
2025-05-01,0.086680
2017-05-01,0.071137
2022-03-01,0.041513
2024-05-01,0.078792
2019-10-01,0.066241
2024-09-03,0.080712
2016-03-01,0.071594
2017-09-01,0.069900
2020-03-02,0.061603
2023-12-01,0.075246
2025-09-02,0.088476
2019-03-01,0.072243
2020-02-03,0.061743
2025-04-01,0.085117
2017-04-03,0.070807
2017-11-01,0.069190
2023-07-03,0.067219