f/overrides/event-backup/avolx-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,ctime
2013-12-16,0.000000,2021-12-20 13:20:52
2013-12-31,0.013000,2021-12-20 13:20:52
2014-12-16,0.000000,2021-12-20 13:20:52
2014-12-16,0.095,2018-02-07 09:59:22
2015-12-16,0.000000,2021-12-20 13:20:52
2015-12-16,0.56,2018-02-07 09:59:22
2013-12-31,0.013,2018-02-07 09:59:22
2016-12-16,0.000000,2021-12-20 13:20:52
2016-12-16,0.49,2018-02-07 09:59:22
2017-12-15,0.000000,2021-12-20 13:20:52
2017-12-15,0.176,2018-02-07 09:59:22
2013-12-16,0.19,2018-02-07 09:59:22
2018-06-29,0.037000,2021-12-20 13:20:52
2018-09-28,0.031000,2021-12-20 13:20:52
2018-12-17,0.000000,2021-12-20 13:20:52
2018-12-31,0.035000,2021-12-20 13:20:52
2018-12-31,0.035,2020-04-10 14:33:52
2019-03-29,0.024000,2021-12-20 13:20:52
2019-06-28,0.036000,2021-12-20 13:20:52
2019-09-30,0.114000,2021-12-20 13:20:52
2019-12-30,0.025000,2021-12-20 13:20:52
2019-12-30,0.025,2020-04-10 14:33:52
2019-03-29,0.024,2020-04-10 14:33:52
2013-12-16,0.19,2020-04-10 14:33:52
2013-12-31,0.013,2020-04-10 14:33:52
2019-09-30,0.114,2020-04-10 14:33:52
2018-06-29,0.037,2020-04-10 14:33:52
2019-06-28,0.036,2020-04-10 14:33:52
2018-09-28,0.031,2020-04-10 14:33:52
2014-12-16,0.095,2020-04-10 14:33:52
2015-12-16,0.56,2020-04-10 14:33:52
2016-12-16,0.49,2020-04-10 14:33:52
2017-12-15,0.176,2020-04-10 14:33:52
2018-12-17,0.083,2020-04-10 14:33:52
2020-06-29,0.007000,2021-12-20 13:20:52
2020-06-29,0.007,2020-07-09 10:54:47
2018-12-31,0.035,2020-07-09 10:54:47
2019-12-30,0.025,2020-07-09 10:54:47
2019-03-29,0.024,2020-07-09 10:54:47
2013-12-16,0.0,2021-10-23 20:14:09
2013-12-16,0.19,2021-08-22 11:35:58
2013-12-16,0.0,2021-03-01 22:16:32
2013-12-16,0.19,2020-07-09 10:54:47
2013-12-31,0.013,2020-07-09 10:54:47
2019-09-30,0.114,2020-07-09 10:54:47
2018-06-29,0.037,2020-07-09 10:54:47
2019-06-28,0.036,2020-07-09 10:54:47
2018-09-28,0.031,2020-07-09 10:54:47
2014-12-16,0.095,2020-07-09 10:54:47
2015-12-16,0.56,2020-07-09 10:54:47
2016-12-16,0.49,2020-07-09 10:54:47
2017-12-15,0.176,2020-07-09 10:54:47
2018-12-17,0.083,2020-07-09 10:54:47
2020-12-17,0.000000,2021-12-20 13:20:52
2020-12-17,0.0,2021-10-23 20:14:09
2020-12-17,0.603,2021-08-22 11:35:58
2018-09-28,0.031,2021-08-23 19:55:00
2014-12-16,0.0,2021-10-23 20:14:09
2014-12-16,0.095,2021-08-23 19:55:00
2015-12-16,0.0,2021-10-23 20:14:09
2015-12-16,0.56,2021-08-23 19:55:00
2016-12-16,0.0,2021-10-23 20:14:09
2016-12-16,0.49,2021-08-23 19:55:00
2017-12-15,0.0,2021-10-23 20:14:09
2017-12-15,0.176,2021-08-23 19:55:00
2018-12-17,0.0,2021-10-23 20:14:09
2018-12-17,0.083,2021-08-23 19:55:00
2020-12-17,0.0,2021-03-01 22:16:32
2018-09-28,0.031,2021-03-01 22:16:32
2014-12-16,0.095,2021-08-22 11:35:58
2014-12-16,0.0,2021-03-01 22:16:32
2015-12-16,0.56,2021-08-22 11:35:58
2015-12-16,0.0,2021-03-01 22:16:32
2016-12-16,0.49,2021-08-22 11:35:58
2016-12-16,0.0,2021-03-01 22:16:32
2017-12-15,0.176,2021-08-22 11:35:58
2017-12-15,0.0,2021-03-01 22:16:32
2018-12-17,0.083,2021-08-22 11:35:58
2018-12-17,0.0,2021-03-01 22:16:32
2021-12-16,0.000000,2022-03-10 08:33:27