Cross-source identifiers
Every current identifier attachment, with the link method and confidence carried verbatim — deterministic links are 1.000; probabilistic links surface their real matcher confidence, never rounded up.
| Scheme | Value | Source table | Link method | Confidence | Since | Provenance |
|---|---|---|---|---|---|---|
| cms_op_manufacturer_id | 100001448155 | cms_open_payments | deterministic_manufacturer_id | 1.000 | 2026-06-13 | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 evidence: {"rule":"D-OP-MANUFACTURER","manufacturer_id":"100001448155","manufacturer_name":"Sequel Med Tech, LLC","manufacturer_state":"NH"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| pays → | FIRAS AKHRASS (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1487636205","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | LEAH AKINSEYE (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1952781064","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | IPEK ALPERTUNGA (CT) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1386166452","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | RAUF BABA (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1689677296","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | SAMATA BASANI (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1689929820","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BENJAMIN BRANNICK (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1679718357","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | KELSEY DEXTER (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1013233816","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MELISSA CARLUCCI (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1386608404","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | RICHARD CHILDRESS (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1578538070","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ELENA CHRISTOFIDES (OH) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1306893433","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ALAN COHEN (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1245203371","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | HEATHER CORN (KY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1396036109","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BRADLEY EILERMAN (KY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1841389822","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | SALEEMAH FAHMI (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1922283506","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | GILBERT FLEMING (WV) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1831400761","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | STEVE FORDAN (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1245432582","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ELIZABETH GRANIERI (NY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1780975102","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BRYAN GRISSETT (LA) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1346747276","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | YASSER HAIDER (IL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1063895746","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | SHIMON HARARY (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1801030192","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MICHAEL HEILE (OH) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1588628234","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | AILEEN HERAS-HERZIG (KY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1962545525","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | DAVID HUFFMAN (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1811101256","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BETHANY JACKSON (AL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1750517835","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ANA KARABELL (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1932361979","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | HAROLD KATZ (MN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1447211859","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | WILLIAM LAGARDE (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1811077837","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ROSEMARIE LAJARA (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1780862102","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MARIA LANSANG (OH) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1235153008","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | HILLARY LOCKEMER (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1457512493","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | JANET LUCIEN (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1437506375","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ANASTASIOS MANESSIS (NY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1467615823","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | PABLO MORA (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1306836168","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | LISA MYERS (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1992768204","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | KAYE-ANNE NEWTON (CT) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1659521094","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | KEVIN PANTALONE (OH) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1922293547","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BHARATHI RAJU (MO) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1720078843","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | FARIHA SALMAN (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1629331079","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | VIRALKUMAR SHAH (CO) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1255762118","manufacturer_id":"100001448155","nature_of_payment":"Consulting Fee"} |
| pays → | JACK SNITZER (MD) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1033152103","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MAGDALENE SZUSZKIEWICZ-GARCIA (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1033311386","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | EUGENE WRIGHT (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1528197555","manufacturer_id":"100001448155","nature_of_payment":"Consulting Fee"} |
| pays → | VICTORIA ACKER (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1366200529","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | SHARAIN ADAMS (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1275701385","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | JENNIFER BECKER (FL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1649577115","manufacturer_id":"100001448155","nature_of_payment":"Consulting Fee"} |
| pays → | NATALIE BELLINI (NY) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1619436664","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | JENNA BROTHERS (NC) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1407278146","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | DENISE BROWN (MN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1851836464","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ERICA CONLEY (AL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1972919165","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MARIA DAIGNEAULT (CT) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1992891774","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | JACOB DAVIS (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1255889903","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | CINDY EARLE (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1740514728","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | ASHLEY FERGUSON (IL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1629586946","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | MACKENSLEY GRAY (AL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1104668797","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | LAUREN HAMANN (CT) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1447994207","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | TABITHA HARRIS (MA) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1841528643","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | BRADLEY HISE (MN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1841964178","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | LAURA HULL (TX) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1306269337","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | JOSEPH LENNARTZ (MO) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1225606742","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | CHELSEA LUGONE (PA) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1265897052","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | AVA MCPEAKE (TN) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1760664247","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | HANNAH PERKINS (AL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1881342889","manufacturer_id":"100001448155","nature_of_payment":"Food and Beverage"} |
| pays → | LAUREN SOSDORF (FL) | 1.000 | cms_open_payments | evidencerecorded: 2026-06-13 methodology: entity-graph/v1 attributes: {"source":"cms_open_payments"} evidence: {"rule":"D-OP-PAYS","record_type":"general","recipient_npi":"1083031082","manufacturer_id":"100001448155","nature_of_payment":"Consulting Fee"} |
Current record
Current claims returned for this entity, grouped by provenance subject. The table exposes the source identifier recorded for each claim.
Point-in-time
Query retained claim coordinates under bitemporal-read/v1. Most facts have no superseded row; dates outside retained coverage may return no prior version, and diffs require both coordinates.
Pick a date to reconstruct, or two dates to diff. Equivalent JSON: /api/v1/history/{subject_type}/{subject_id}?at=… and …/diff?from=…&to=…