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 |
|---|---|---|---|---|---|---|
| pac_id | 9739518432 | snf_all_owners | deterministic_pac_in_all_owners | 1.000 | 2026-06-14 | evidencerecorded: 2026-06-14 methodology: entity-graph/v1 evidence: {"rule":"D-OWNER","source_pk":30028,"type_owner":"O","enrollment_id":"O20050622000532"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| owns → | OAKWOOD HEALTH CARE SERVICES INC. (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":30028,"type_owner":"O","enrollment_id":"O20050622000532","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"OAKWOOD HEALTH CARE SERVICES, INC."} |
| owns → | OAKWOOD HEALTH CARE SERVICES INC. (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":30047,"type_owner":"O","enrollment_id":"O20050622000778","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"OAKWOOD HEALTH CARE SERVICES, INC."} |
| owns → | CARLISLE HEALTH CARE INC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":42839,"type_owner":"O","enrollment_id":"O20061120000442","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"CARLISLE HEALTH CARE INC"} |
| owns → | MULTICARE MANAGEMENT GROUP, INC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":65242,"type_owner":"O","enrollment_id":"O20080320000062","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"MULTICARE MANAGEMENT GROUP, INC"} |
| owns → | EMBASSY OAK HILLS MANAGEMENT (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":78567,"type_owner":"O","enrollment_id":"O20090601000498","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY OAK HILLS MANAGEMENT"} |
| owns → | EMBASSY AUTUMNWOOD MANAGEMENT (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":78610,"type_owner":"O","enrollment_id":"O20090602000589","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY AUTUMNWOOD MANAGEMENT"} |
| owns → | EMBASSY MADISON MANAGEMENT, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":84305,"type_owner":"O","enrollment_id":"O20091215000635","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY MADISON MANAGEMENT, LLC"} |
| owns → | SWANTON HEALTH CARE & RETIREMENT CENTER INC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/15/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":121215,"type_owner":"O","enrollment_id":"O20120620000301","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"SWANTON HEALTH CARE & RETIREMENT CENTER INC"} |
| owns → | EMBASSY CRYSTAL CARE, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":125683,"type_owner":"O","enrollment_id":"O20121218000398","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY CRYSTAL CARE LLC"} |
| owns → | EMBASSY FOREST HILLS (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":135053,"type_owner":"O","enrollment_id":"O20140303001487","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY FOREST HILLS"} |
| owns → | EMBASSY ROYAL OAK, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"85","association_date":"01/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":136608,"type_owner":"O","enrollment_id":"O20140422000025","role_code_owner":"85","role_text_owner":"DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY ROYAL OAK LLC"} |
| owns → | EMBASSY LONGMEADOW LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2020","percentage_ownership":70} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":157935,"type_owner":"O","enrollment_id":"O20160505000107","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":70,"enrollment_organization_name":"EMBASSY LONGMEADOW LLC"} |
| owns → | EMBASSY LOGAN, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"03/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":200540,"type_owner":"O","enrollment_id":"O20200401000182","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"EMBASSY LOGAN LLC"} |
| owns → | EMBASSY WOODVIEW, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"85","association_date":"06/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":200593,"type_owner":"O","enrollment_id":"O20200401001337","role_code_owner":"85","role_text_owner":"DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY WOODVIEW LLC"} |
| owns → | EMBASSY PICKERINGTON, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"85","association_date":"03/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":200932,"type_owner":"O","enrollment_id":"O20200414000389","role_code_owner":"85","role_text_owner":"DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY PICKERINGTON LLC"} |
| owns → | EMBASSY CAMBRIDGE, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"85","association_date":"03/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":201106,"type_owner":"O","enrollment_id":"O20200428000798","role_code_owner":"85","role_text_owner":"DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY CAMBRIDGE, LLC"} |
| owns → | EMBASSY SHARON, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"05/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":201355,"type_owner":"O","enrollment_id":"O20200508001305","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY SHARON, LLC"} |
| owns → | EMBASSY HERMITAGE, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"05/01/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":201434,"type_owner":"O","enrollment_id":"O20200514001008","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY HERMITAGE LLC"} |
| owns → | EMBASSY HUNTINGDON PARK, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"11/10/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":205656,"type_owner":"O","enrollment_id":"O20201201001989","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY HUNTINGDON PARK LLC"} |
| owns → | EMBASSY HILLSDALE PARK, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"11/10/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":206260,"type_owner":"O","enrollment_id":"O20201222002172","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY HILLSDALE PARK, LLC"} |
| owns → | EMBASSY PARK AVENUE, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"11/10/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":206319,"type_owner":"O","enrollment_id":"O20201223000197","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY PARK AVENUE, LLC"} |
| owns → | EMBASSY WOODLAND PARK, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"11/10/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":206398,"type_owner":"O","enrollment_id":"O20201229000170","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY WOODLAND PARK LLC"} |
| owns → | EMBASSY HEARTHSIDE, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"11/10/2020","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":207056,"type_owner":"O","enrollment_id":"O20210126001350","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY HEARTHSIDE, LLC"} |
| owns → | EMBASSY VALLEY VIEW LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"03/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":208613,"type_owner":"O","enrollment_id":"O20210401000229","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY VALLEY VIEW LLC"} |
| owns → | EMBASSY NEWARK, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"09/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":213671,"type_owner":"O","enrollment_id":"O20210907002780","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY NEWARK LLC"} |
| owns → | EMBASSY PAINESVILLE, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"09/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":213676,"type_owner":"O","enrollment_id":"O20210908000514","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY PAINESVILLE LLC"} |
| owns → | EMBASSY MARION, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"09/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":213683,"type_owner":"O","enrollment_id":"O20210908000549","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY MARION LLC"} |
| owns → | EMBASSY EUCLID, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"09/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":213698,"type_owner":"O","enrollment_id":"O20210909003702","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY EUCLID, LLC"} |
| owns → | EMBASSY LYNDHURST, LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"09/01/2021","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":213719,"type_owner":"O","enrollment_id":"O20210910000633","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY LYNDHURST, LLC"} |
| owns → | EMBASSY SAXONBURG LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2022","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":219035,"type_owner":"O","enrollment_id":"O20220322001173","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY SAXONBURG LLC"} |
| owns → | EMBASSY WILLARD LLC (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"01/01/2024","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":249332,"type_owner":"O","enrollment_id":"O20240213000750","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY WILLARD LLC"} |
| owns → | EMBASSY OF WYOMING VALLEY LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"06/01/2024","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":256267,"type_owner":"O","enrollment_id":"O20240711001856","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY OF WYOMING VALLEY, LLC"} |
| owns → | EMBASSY OF SCRANTON LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"06/01/2024","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":256290,"type_owner":"O","enrollment_id":"O20240711003218","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY OF SCRANTON, LLC"} |
| owns → | EMBASSY OF TUNKHANNOCK LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"06/01/2024","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":256311,"type_owner":"O","enrollment_id":"O20240711003559","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY OF TUNKHANNOCK, LLC"} |
| owns → | EMBASSY OF EAST MOUNTAIN LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"06/01/2024","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9739518432","source_pk":256535,"type_owner":"O","enrollment_id":"O20240716004307","role_code_owner":"34","role_text_owner":"5% OR GREATER DIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"EMBASSY OF EAST MOUNTAIN, LLC"} |
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=…