Architectural Commitment 01 · Event Sourcing
Reconstruct what Avena knew on any date.
Every state change in Avena Terminal — every score revision, every regime classification, every AVM query, every grade change — is written to an append-only event log before the projection updates. The database is the operational view; the event log is the truth. Replay it at any timestamp to see the system as it existed then.
System state as of now
1,000
events recorded
2026-06-10 09:45:44
earliest
2026-09-12 04:00:10
latest
counterpart
658
limitation
95
prediction
93
regime
90
regulatory
36
lead
27
memo
1
Last 100 events · prediction
| When | Type | Aggregate | Payload | # |
|---|---|---|---|---|
| 2026-10-10 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-10 | {"run_date":"2026-10-10","panelists":[],"consensus_index":null,"disagreement_index":null} | 1429 |
| 2026-10-09 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-09 | {"run_date":"2026-10-09","panelists":[],"consensus_index":null,"disagreement_index":null} | 1419 |
| 2026-10-08 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-08 | {"run_date":"2026-10-08","panelists":[],"consensus_index":null,"disagreement_index":null} | 1409 |
| 2026-10-07 06:00:46 | delphi.panel_completed | prediction/delphi:2026-10-07 | {"run_date":"2026-10-07","panelists":[],"consensus_index":null,"disagreement_index":null} | 1399 |
| 2026-10-06 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-06 | {"run_date":"2026-10-06","panelists":[],"consensus_index":null,"disagreement_index":null} | 1388 |
| 2026-10-05 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-05 | {"run_date":"2026-10-05","panelists":[],"consensus_index":null,"disagreement_index":null} | 1378 |
| 2026-10-04 06:00:46 | delphi.panel_completed | prediction/delphi:2026-10-04 | {"run_date":"2026-10-04","panelists":[],"consensus_index":null,"disagreement_index":null} | 1368 |
| 2026-10-03 06:00:46 | delphi.panel_completed | prediction/delphi:2026-10-03 | {"run_date":"2026-10-03","panelists":[],"consensus_index":null,"disagreement_index":null} | 1358 |
| 2026-10-02 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-02 | {"run_date":"2026-10-02","panelists":[],"consensus_index":null,"disagreement_index":null} | 1348 |
| 2026-10-01 06:00:47 | delphi.panel_completed | prediction/delphi:2026-10-01 | {"run_date":"2026-10-01","panelists":[],"consensus_index":null,"disagreement_index":null} | 1338 |
| 2026-09-30 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-30 | {"run_date":"2026-09-30","panelists":[],"consensus_index":null,"disagreement_index":null} | 1328 |
| 2026-09-29 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-29 | {"run_date":"2026-09-29","panelists":[],"consensus_index":null,"disagreement_index":null} | 1318 |
| 2026-09-28 06:00:46 | delphi.panel_completed | prediction/delphi:2026-09-28 | {"run_date":"2026-09-28","panelists":[],"consensus_index":null,"disagreement_index":null} | 1308 |
| 2026-09-27 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-27 | {"run_date":"2026-09-27","panelists":[],"consensus_index":null,"disagreement_index":null} | 1298 |
| 2026-09-26 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-26 | {"run_date":"2026-09-26","panelists":[],"consensus_index":null,"disagreement_index":null} | 1288 |
| 2026-09-25 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-25 | {"run_date":"2026-09-25","panelists":[],"consensus_index":null,"disagreement_index":null} | 1278 |
| 2026-09-24 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-24 | {"run_date":"2026-09-24","panelists":[],"consensus_index":null,"disagreement_index":null} | 1268 |
| 2026-09-23 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-23 | {"run_date":"2026-09-23","panelists":[],"consensus_index":null,"disagreement_index":null} | 1258 |
| 2026-09-22 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-22 | {"run_date":"2026-09-22","panelists":[],"consensus_index":null,"disagreement_index":null} | 1248 |
| 2026-09-21 06:00:46 | delphi.panel_completed | prediction/delphi:2026-09-21 | {"run_date":"2026-09-21","panelists":[],"consensus_index":null,"disagreement_index":null} | 1237 |
| 2026-09-20 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-20 | {"run_date":"2026-09-20","panelists":[],"consensus_index":null,"disagreement_index":null} | 1227 |
| 2026-09-19 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-19 | {"run_date":"2026-09-19","panelists":[],"consensus_index":null,"disagreement_index":null} | 1217 |
| 2026-09-18 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-18 | {"run_date":"2026-09-18","panelists":[],"consensus_index":null,"disagreement_index":null} | 1207 |
| 2026-09-17 06:00:46 | delphi.panel_completed | prediction/delphi:2026-09-17 | {"run_date":"2026-09-17","panelists":[],"consensus_index":null,"disagreement_index":null} | 1197 |
| 2026-09-16 06:00:46 | delphi.panel_completed | prediction/delphi:2026-09-16 | {"run_date":"2026-09-16","panelists":[],"consensus_index":null,"disagreement_index":null} | 1187 |
| 2026-09-15 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-15 | {"run_date":"2026-09-15","panelists":[],"consensus_index":null,"disagreement_index":null} | 1177 |
| 2026-09-14 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-14 | {"run_date":"2026-09-14","panelists":[],"consensus_index":null,"disagreement_index":null} | 1167 |
| 2026-09-13 06:00:46 | delphi.panel_completed | prediction/delphi:2026-09-13 | {"run_date":"2026-09-13","panelists":[],"consensus_index":null,"disagreement_index":null} | 1157 |
| 2026-09-12 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-12 | {"run_date":"2026-09-12","panelists":[],"consensus_index":null,"disagreement_index":null} | 1147 |
| 2026-09-11 06:00:48 | delphi.panel_completed | prediction/delphi:2026-09-11 | {"run_date":"2026-09-11","panelists":[],"consensus_index":null,"disagreement_index":null} | 1137 |
| 2026-09-10 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-10 | {"run_date":"2026-09-10","panelists":[],"consensus_index":null,"disagreement_index":null} | 1127 |
| 2026-09-09 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-09 | {"run_date":"2026-09-09","panelists":[],"consensus_index":null,"disagreement_index":null} | 1117 |
| 2026-09-08 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-08 | {"run_date":"2026-09-08","panelists":[],"consensus_index":null,"disagreement_index":null} | 1107 |
| 2026-09-07 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-07 | {"run_date":"2026-09-07","panelists":[],"consensus_index":null,"disagreement_index":null} | 1097 |
| 2026-09-06 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-06 | {"run_date":"2026-09-06","panelists":[],"consensus_index":null,"disagreement_index":null} | 1087 |
| 2026-09-05 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-05 | {"run_date":"2026-09-05","panelists":[],"consensus_index":null,"disagreement_index":null} | 1077 |
| 2026-09-04 06:01:43 | delphi.panel_completed | prediction/delphi:2026-09-04 | {"run_date":"2026-09-04","panelists":[],"consensus_index":null,"disagreement_index":null} | 1066 |
| 2026-09-03 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-03 | {"run_date":"2026-09-03","panelists":[],"consensus_index":null,"disagreement_index":null} | 1056 |
| 2026-09-02 06:00:47 | delphi.panel_completed | prediction/delphi:2026-09-02 | {"run_date":"2026-09-02","panelists":[],"consensus_index":null,"disagreement_index":null} | 1047 |
| 2026-09-01 06:01:12 | delphi.panel_completed | prediction/delphi:2026-09-01 | {"run_date":"2026-09-01","panelists":[],"consensus_index":null,"disagreement_index":null} | 1036 |
| 2026-08-31 06:00:02 | delphi.panel_completed | prediction/delphi:2026-08-31 | {"run_date":"2026-08-31","panelists":[],"consensus_index":null,"disagreement_index":null} | 1026 |
| 2026-08-30 06:00:25 | delphi.panel_completed | prediction/delphi:2026-08-30 | {"run_date":"2026-08-30","panelists":[],"consensus_index":null,"disagreement_index":null} | 1016 |
| 2026-08-29 06:00:25 | delphi.panel_completed | prediction/delphi:2026-08-29 | {"run_date":"2026-08-29","panelists":[],"consensus_index":null,"disagreement_index":null} | 1006 |
| 2026-08-28 06:00:37 | delphi.panel_completed | prediction/delphi:2026-08-28 | {"run_date":"2026-08-28","panelists":[],"consensus_index":null,"disagreement_index":null} | 997 |
| 2026-08-27 06:01:53 | delphi.panel_completed | prediction/delphi:2026-08-27 | {"run_date":"2026-08-27","panelists":["Perplexity Sonar"],"consensus_index":53.1,"disagreement_index":0} | 987 |
| 2026-08-26 06:01:51 | delphi.panel_completed | prediction/delphi:2026-08-26 | {"run_date":"2026-08-26","panelists":["Perplexity Sonar"],"consensus_index":51.8,"disagreement_index":0} | 977 |
| 2026-08-25 06:01:38 | delphi.panel_completed | prediction/delphi:2026-08-25 | {"run_date":"2026-08-25","panelists":["Perplexity Sonar"],"consensus_index":52.8,"disagreement_index":0} | 967 |
| 2026-08-24 06:03:49 | delphi.panel_completed | prediction/delphi:2026-08-24 | {"run_date":"2026-08-24","panelists":["Perplexity Sonar"],"consensus_index":54.5,"disagreement_index":0} | 957 |
| 2026-08-23 06:01:22 | delphi.panel_completed | prediction/delphi:2026-08-23 | {"run_date":"2026-08-23","panelists":["Perplexity Sonar"],"consensus_index":53.8,"disagreement_index":0} | 947 |
| 2026-08-22 06:01:12 | delphi.panel_completed | prediction/delphi:2026-08-22 | {"run_date":"2026-08-22","panelists":["Perplexity Sonar"],"consensus_index":54.7,"disagreement_index":0} | 937 |
| 2026-08-21 06:02:03 | delphi.panel_completed | prediction/delphi:2026-08-21 | {"run_date":"2026-08-21","panelists":["Perplexity Sonar"],"consensus_index":52.8,"disagreement_index":0} | 928 |
| 2026-08-20 06:01:48 | delphi.panel_completed | prediction/delphi:2026-08-20 | {"run_date":"2026-08-20","panelists":["Perplexity Sonar"],"consensus_index":52.3,"disagreement_index":0} | 918 |
| 2026-08-19 06:02:23 | delphi.panel_completed | prediction/delphi:2026-08-19 | {"run_date":"2026-08-19","panelists":["Perplexity Sonar"],"consensus_index":53.5,"disagreement_index":0} | 908 |
| 2026-08-18 06:00:49 | delphi.panel_completed | prediction/delphi:2026-08-18 | {"run_date":"2026-08-18","panelists":["Perplexity Sonar"],"consensus_index":52.7,"disagreement_index":0} | 897 |
| 2026-08-17 06:01:42 | delphi.panel_completed | prediction/delphi:2026-08-17 | {"run_date":"2026-08-17","panelists":["Perplexity Sonar"],"consensus_index":50.8,"disagreement_index":0} | 888 |
| 2026-08-16 06:01:04 | delphi.panel_completed | prediction/delphi:2026-08-16 | {"run_date":"2026-08-16","panelists":["Perplexity Sonar"],"consensus_index":52.5,"disagreement_index":0} | 877 |
| 2026-08-15 06:02:05 | delphi.panel_completed | prediction/delphi:2026-08-15 | {"run_date":"2026-08-15","panelists":["Perplexity Sonar"],"consensus_index":53.8,"disagreement_index":0} | 868 |
| 2026-08-14 06:00:33 | delphi.panel_completed | prediction/delphi:2026-08-14 | {"run_date":"2026-08-14","panelists":["Perplexity Sonar"],"consensus_index":57.8,"disagreement_index":0} | 858 |
| 2026-08-11 06:00:48 | delphi.panel_completed | prediction/delphi:2026-08-11 | {"run_date":"2026-08-11","panelists":["Perplexity Sonar"],"consensus_index":52.5,"disagreement_index":0} | 831 |
| 2026-08-10 06:02:05 | delphi.panel_completed | prediction/delphi:2026-08-10 | {"run_date":"2026-08-10","panelists":["Perplexity Sonar"],"consensus_index":54.3,"disagreement_index":0} | 822 |
| 2026-08-09 06:01:27 | delphi.panel_completed | prediction/delphi:2026-08-09 | {"run_date":"2026-08-09","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":50,"d | 810 |
| 2026-08-08 06:01:55 | delphi.panel_completed | prediction/delphi:2026-08-08 | {"run_date":"2026-08-08","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":48.6, | 800 |
| 2026-08-07 06:01:18 | delphi.panel_completed | prediction/delphi:2026-08-07 | {"run_date":"2026-08-07","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":52.4,"disagreement_index | 789 |
| 2026-08-06 06:01:13 | delphi.panel_completed | prediction/delphi:2026-08-06 | {"run_date":"2026-08-06","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":52.3,"disagreement_index | 778 |
| 2026-08-05 06:01:33 | delphi.panel_completed | prediction/delphi:2026-08-05 | {"run_date":"2026-08-05","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":51,"disagreement_index": | 769 |
| 2026-08-04 06:56:50 | delphi.panel_completed | prediction/delphi:2026-08-04 | {"run_date":"2026-08-04","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":52,"disagreement_index": | 757 |
| 2026-08-03 06:56:49 | delphi.panel_completed | prediction/delphi:2026-08-03 | {"run_date":"2026-08-03","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":52,"disagreement_index": | 746 |
| 2026-08-02 06:56:44 | delphi.panel_completed | prediction/delphi:2026-08-02 | {"run_date":"2026-08-02","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5"],"consensus_index":52,"disagreement_index": | 736 |
| 2026-08-01 06:56:09 | delphi.panel_completed | prediction/delphi:2026-08-01 | {"run_date":"2026-08-01","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.5, | 726 |
| 2026-07-31 06:33:40 | delphi.panel_completed | prediction/delphi:2026-07-31 | {"run_date":"2026-07-31","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.5, | 714 |
| 2026-07-30 06:33:52 | delphi.panel_completed | prediction/delphi:2026-07-30 | {"run_date":"2026-07-30","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.5, | 703 |
| 2026-07-29 06:16:10 | delphi.panel_completed | prediction/delphi:2026-07-29 | {"run_date":"2026-07-29","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52,"d | 693 |
| 2026-07-28 06:16:06 | delphi.panel_completed | prediction/delphi:2026-07-28 | {"run_date":"2026-07-28","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.9, | 682 |
| 2026-07-27 06:16:08 | delphi.panel_completed | prediction/delphi:2026-07-27 | {"run_date":"2026-07-27","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":48.1, | 671 |
| 2026-07-26 06:16:07 | delphi.panel_completed | prediction/delphi:2026-07-26 | {"run_date":"2026-07-26","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":50.9, | 661 |
| 2026-07-25 06:16:09 | delphi.panel_completed | prediction/delphi:2026-07-25 | {"run_date":"2026-07-25","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.3, | 651 |
| 2026-07-24 06:16:04 | delphi.panel_completed | prediction/delphi:2026-07-24 | {"run_date":"2026-07-24","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.1, | 640 |
| 2026-07-23 06:16:13 | delphi.panel_completed | prediction/delphi:2026-07-23 | {"run_date":"2026-07-23","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.5, | 630 |
| 2026-07-22 06:16:15 | delphi.panel_completed | prediction/delphi:2026-07-22 | {"run_date":"2026-07-22","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":50.5, | 618 |
| 2026-07-21 06:38:17 | delphi.panel_completed | prediction/delphi:2026-07-21 | {"run_date":"2026-07-21","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":50.7, | 603 |
| 2026-07-20 06:07:29 | delphi.panel_completed | prediction/delphi:2026-07-20 | {"run_date":"2026-07-20","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":49.7, | 592 |
| 2026-07-19 06:45:32 | delphi.panel_completed | prediction/delphi:2026-07-19 | {"run_date":"2026-07-19","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.5, | 583 |
| 2026-07-18 06:49:48 | delphi.panel_completed | prediction/delphi:2026-07-18 | {"run_date":"2026-07-18","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.5, | 553 |
| 2026-07-17 06:49:53 | delphi.panel_completed | prediction/delphi:2026-07-17 | {"run_date":"2026-07-17","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.3, | 543 |
| 2026-07-16 06:49:48 | delphi.panel_completed | prediction/delphi:2026-07-16 | {"run_date":"2026-07-16","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":48.3, | 533 |
| 2026-07-15 06:49:55 | delphi.panel_completed | prediction/delphi:2026-07-15 | {"run_date":"2026-07-15","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":48.6, | 522 |
| 2026-07-14 06:46:10 | delphi.panel_completed | prediction/delphi:2026-07-14 | {"run_date":"2026-07-14","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.3, | 510 |
| 2026-07-13 06:45:58 | delphi.panel_completed | prediction/delphi:2026-07-13 | {"run_date":"2026-07-13","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.5, | 500 |
| 2026-07-12 06:45:45 | delphi.panel_completed | prediction/delphi:2026-07-12 | {"run_date":"2026-07-12","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":53.5, | 490 |
| 2026-07-11 06:45:49 | delphi.panel_completed | prediction/delphi:2026-07-11 | {"run_date":"2026-07-11","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":51.3, | 480 |
| 2026-07-10 06:45:54 | delphi.panel_completed | prediction/delphi:2026-07-10 | {"run_date":"2026-07-10","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":52.9, | 470 |
| 2026-07-09 06:46:04 | delphi.panel_completed | prediction/delphi:2026-07-09 | {"run_date":"2026-07-09","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":53.5, | 458 |
| 2026-07-08 06:45:34 | delphi.panel_completed | prediction/delphi:2026-07-08 | {"run_date":"2026-07-08","panelists":["Perplexity Sonar"],"consensus_index":62.8,"disagreement_index":0} | 448 |
| 2026-07-07 06:45:54 | delphi.panel_completed | prediction/delphi:2026-07-07 | {"run_date":"2026-07-07","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":55.2, | 437 |
| 2026-07-06 06:45:49 | delphi.panel_completed | prediction/delphi:2026-07-06 | {"run_date":"2026-07-06","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":50.3, | 426 |
| 2026-07-05 06:45:50 | delphi.panel_completed | prediction/delphi:2026-07-05 | {"run_date":"2026-07-05","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":54,"d | 416 |
| 2026-07-04 06:45:45 | delphi.panel_completed | prediction/delphi:2026-07-04 | {"run_date":"2026-07-04","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":55.1, | 406 |
| 2026-07-03 06:46:00 | delphi.panel_completed | prediction/delphi:2026-07-03 | {"run_date":"2026-07-03","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":48.2, | 396 |
| 2026-07-02 06:02:18 | delphi.panel_completed | prediction/delphi:2026-07-02 | {"run_date":"2026-07-02","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":53.2, | 385 |
| 2026-07-01 06:02:22 | delphi.panel_completed | prediction/delphi:2026-07-01 | {"run_date":"2026-07-01","panelists":["Claude Sonnet 4.5","Claude Haiku 4.5","Perplexity Sonar"],"consensus_index":49,"d | 373 |
Why this exists
A CoStar M&A analyst asks "show me the system state on 2026-03-14." The honest answer for most data vendors is "we can't." The honest answer for Avena is this page. Event sourcing is foundational infrastructure: it cannot be retrofitted, and it turns "trust our backtest" into "replay the backtest yourself."