f/overrides/event-backup/nsmmx-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

7.6 KiB

1DateDividends
21998-02-270.031000
32010-10-290.012000
42012-07-310.010000
52018-07-310.012000
62024-11-290.022000
72006-06-300.024000
82007-02-280.028000
92012-04-300.010000
102020-05-290.010000
111999-03-310.033000
122003-11-280.016000
132013-08-300.009000
142018-03-290.010000
152021-07-300.006000
162021-10-290.005000
171994-11-300.033000
181997-01-310.034000
191998-08-310.033000
202003-02-280.016000
212010-12-310.014000
222021-09-300.004000
232025-12-310.023000
242003-01-310.018000
252004-05-280.017000
262007-04-300.027000
272020-08-310.010000
282000-10-310.036000
292001-01-310.036000
302008-05-300.024000
312013-02-280.008000
322013-04-300.009000
332013-07-310.009000
342024-10-310.023000
352003-03-310.017000
362007-09-280.027000
372011-09-300.012000
382024-06-280.020000
392025-04-300.023000
402026-07-310.023000
411995-06-300.034000
422004-02-270.015000
432004-07-300.018000
442010-01-290.011000
452025-07-310.021000
461999-07-300.033000
472005-06-300.020000
482007-01-310.026000
492009-04-300.019000
502010-06-300.013000
512016-06-300.006000
521995-03-310.037000
531997-04-300.034000
541998-11-300.032000
552000-11-300.035000
562013-09-300.008000
572016-04-290.006000
582019-02-280.012000
592023-08-310.018000
601995-12-290.035000
612000-02-290.031000
622000-03-310.035000
632010-05-280.012000
642022-08-310.011000
652023-02-280.013000
662024-07-310.021000
672025-06-300.021000
681997-02-280.033000
692005-02-280.018000
702006-08-310.024000
712017-07-310.008000
722019-07-310.014000
732009-01-300.022000
742013-06-280.008000
752018-04-300.011000
762018-09-280.012000
772026-06-300.023000
782005-07-290.021000
792006-04-280.024000
802008-12-310.024000
812013-01-310.009000
822015-08-310.007000
832015-11-300.004000
842016-03-310.005000
852011-12-300.012000
862016-02-290.006000
872017-10-310.010000
881996-01-310.034000
891998-09-300.032000
901999-11-300.032000
912001-12-310.025000
922006-07-310.024000
932009-06-300.018000
942011-04-290.015000
952011-08-310.013000
962012-06-290.010000
972012-09-280.009000
982016-08-310.007000
992020-12-310.009000
1002005-01-310.019000
1012008-06-300.024000
1022001-10-310.027000
1032007-03-300.027000
1042012-08-310.010000
1052017-02-280.009000
1062022-04-290.006000
1071995-04-280.035000
1081997-06-300.034000
1092000-01-310.033000
1102001-05-310.035000
1112003-05-300.017000
1122014-05-300.008000
1132023-06-300.016000
1141995-10-310.034000
1151996-02-290.032000
1162002-11-290.019000
1172006-05-310.024000
1182019-08-300.015000
1191997-07-310.035000
1201997-11-280.032000
1212003-12-310.017000
1222015-06-300.006000
1232018-06-290.011000
1241999-05-280.034000
1252002-08-300.020000
1262010-07-300.013000
1272014-06-300.007000
1282020-09-300.009000
1292023-09-290.017000
1302024-05-310.020000
1312001-06-290.033000
1322021-01-290.008000
1331994-01-310.029000
1341994-12-300.035000
1351997-05-300.035000
1362002-12-310.019000
1372005-10-310.021000
1382010-11-300.013000
1392012-05-310.011000
1402014-07-310.007000
1412025-10-310.023000
1421994-08-310.031000
1431994-10-310.033000
1441998-05-290.034000
1452005-11-300.021000
1462007-08-310.026000
1472008-04-300.025000
1482010-03-310.010000
1491996-03-290.038000
1501999-01-290.034000
1511999-04-300.033000
1522003-04-300.017000
1532011-07-290.014000
1542025-08-290.023000
1552002-01-310.024000
1562007-11-300.027000
1572008-02-290.026000
1582023-03-310.015000
1592005-03-310.020000
1602008-09-300.025000
1612009-05-290.018000
1622010-02-260.013000
1632015-01-300.007000
1642015-10-300.005000
1652017-06-300.008000
1662022-01-310.007000
1672025-09-300.023000
1681995-11-300.034000
1692007-10-310.026000
1702008-03-310.025000
1712009-07-310.017000
1722011-02-280.016000
1732013-03-280.008000
1742016-07-290.006000
1752016-10-310.009000
1762018-11-300.013000
1772023-05-310.017000
1781999-09-300.031000
1792005-05-310.021000
1802009-11-300.013000
1812012-12-310.010000
1822014-09-300.007000
1832015-02-270.006000
1842015-04-300.006000
1852015-12-310.005000
1862022-10-310.012000
1871993-12-310.029000
1881995-01-310.036000
1892000-09-290.034000
1902006-12-290.026000
1912016-11-300.009000
1922024-04-300.020000
1932024-09-300.023000
1941998-04-300.033000
1952001-11-300.026000
1962002-06-280.021000
1972017-03-310.010000
1981996-05-310.036000
1992013-11-290.008000
2002018-10-310.014000
2012021-02-260.008000
2022022-02-280.005000
2032026-05-290.024000
2041996-08-300.036000
2051998-12-310.033000
2062001-02-280.032000
2072001-03-300.036000
2082013-05-310.009000
2092015-07-310.007000
2102022-11-300.014000
2111996-11-290.034000
2121998-01-300.034000
2132002-02-280.021000
2142019-03-290.014000
2151997-09-300.032000
2162009-08-310.016000
2172021-03-310.007000
2182024-12-310.023000
2192005-04-290.020000
2202006-09-290.025000
2212013-10-310.009000
2222019-12-310.013000
2232023-10-310.019000
2242009-10-300.013000
2252011-06-300.014000
2262013-12-310.009000
2272018-05-310.011000
2282022-07-290.009000
2291997-10-310.033000
2302004-04-300.016000
2312005-12-300.021000
2322025-02-280.020000
2331994-09-300.031000
2341996-10-310.036000
2351998-03-310.034000
2362003-10-310.017000
2372020-07-310.010000
2382026-02-270.020000
2391996-06-280.034000
2402000-04-280.034000
2412015-03-310.007000
2422020-03-310.013000
2431999-06-300.032000
2442000-07-310.035000
2452005-09-300.021000
2462006-11-300.026000
2472008-08-290.023000
2482017-12-290.011000
2492026-03-310.024000
2501994-03-310.030000
2511996-04-300.034000
2521998-07-310.033000
2531998-10-300.033000
2542014-04-300.008000
2552015-05-290.007000
2562020-06-300.011000
2572020-11-300.008000
2581995-07-310.035000
2592000-05-310.035000
2602000-08-310.035000
2612001-04-300.035000
2622004-12-310.019000
2632012-10-310.010000
2642017-01-310.010000
2652019-06-280.014000
2662020-10-300.009000
2672003-09-300.016000
2682004-08-310.018000
2692006-01-310.022000
2702010-08-310.012000
2712012-02-290.009000
2722021-12-310.005000
2732024-02-290.019000
2742025-01-310.023000
2752007-07-310.026000
2762007-12-310.026000
2772012-01-310.011000
2782014-03-310.008000
2792018-01-310.011000
2802023-11-300.018000
2811996-12-310.036000
2821997-08-290.033000
2831999-02-260.030000
2842002-09-300.019000
2852004-06-300.017000
2862011-10-310.013000
2872014-02-280.008000
2882021-08-310.005000
2891996-09-300.034000
2902003-08-290.016000
2912004-10-290.019000
2922007-05-310.026000
2932011-05-310.015000
2942018-02-280.009000
2952023-07-310.017000
2962005-08-310.020000
2972017-08-310.010000
2982022-05-310.007000
2992026-01-300.023000
3001993-11-300.026000
3011994-06-300.029000
3022001-08-310.031000
3032004-01-300.017000
3042008-07-310.024000
3052017-11-300.010000
3062006-03-310.022000
3072014-10-310.007000
3082016-09-300.007000
3092017-05-310.009000
3102018-12-310.014000
3112019-01-310.014000
3122023-12-290.019000
3132025-03-310.023000
3142025-05-300.023000
3152014-01-310.008000
3162026-04-300.023000
3171994-04-290.029000
3181997-03-310.035000
3192006-02-280.023000
3202016-01-290.004000
3212016-05-310.006000
3222017-04-280.009000
3232021-11-300.005000
3242022-09-300.011000
3251995-09-290.033000
3261999-08-310.033000
3272000-06-300.034000
3282000-12-290.036000
3292002-10-310.020000
3302008-01-310.026000
3312008-10-310.025000
3322019-04-300.014000
3332024-08-300.023000
3341995-02-280.033000
3352002-03-280.021000
3362004-11-300.018000
3372008-11-280.024000
3382010-09-300.013000
3392020-01-310.013000
3402021-04-300.007000
3412011-11-300.012000
3422019-09-300.013000
3432022-03-310.005000
3441994-02-280.027000
3451996-07-310.036000
3462020-04-300.012000
3472022-06-300.008000
3482009-03-310.019000
3492014-11-280.007000
3502019-10-310.014000
3512025-11-280.022000
3522004-03-310.016000
3532011-01-310.014000
3542003-07-310.016000
3552006-10-310.025000
3562023-01-310.014000
3572024-01-310.020000
3581994-07-290.030000
3591995-05-310.036000
3602001-07-310.031000
3612003-06-300.016000
3622004-09-300.018000
3632011-03-310.014000
3642012-03-300.011000
3652012-11-300.009000
3662021-06-300.007000
3671994-05-310.030000
3681999-10-290.033000
3691999-12-310.032000
3702009-09-300.014000
3712014-12-310.006000
3722016-12-300.010000
3732018-08-310.014000
3742019-05-310.014000
3752023-04-280.015000
3761997-12-310.034000
3771998-06-300.033000
3782002-07-310.021000
3792007-06-290.027000
3802009-12-310.012000
3812015-09-300.006000
3822017-09-290.010000
3832021-05-280.007000
3842022-12-300.015000
3852024-03-280.020000
3861995-08-310.034000
3872001-09-280.029000
3882009-02-270.023000
3892014-08-290.007000
3902019-11-290.012000
3912020-02-280.011000