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 |
|---|---|---|---|---|---|---|
| npi | 1417950163 | nppes_providers | deterministic_pk | 1.000 | 2026-06-10 | evidencerecorded: 2026-06-10 methodology: entity-graph/v1 evidence: {"rule":"D-NPI","source_pk":"1417950163","entity_type_code":"2"} |
| pecos_enrlmt_id | O20120111000437 | pecos_providers | exact_npi_in_pecos | 1.000 | 2026-06-16 | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 evidence: {"npi":"1417950163","rule":"D-PECOS","enrlmt_id":"O20120111000437"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| ← owns | JACQUELINE FOGEL | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0042644866","source_pk":111609,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | ILANA SPRINGER | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"01/01/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0143486639","source_pk":111610,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | SUSAN RICHTER | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"08/29/2024","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0244484343","source_pk":111612,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | LOS ANGELES JEWISH HOME FOR THE AGING (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"07/01/1998","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"0749190569","source_pk":111613,"type_owner":"O","enrollment_id":"O20120111000437","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":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"03/01/1986","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"1456363613","source_pk":111615,"type_owner":"O","enrollment_id":"O20120111000437","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":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | JHA GERIATRIC SERVICES INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"08/01/2019","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"2062321151","source_pk":111618,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | ALYSSA COLT STEIDL | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"07/14/2008","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"2466953039","source_pk":111619,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | SHAHRYAR YADEGAR (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"01/25/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"2961453774","source_pk":111622,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | WILLIAM GREEN | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"08/29/2024","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3476054057","source_pk":111624,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | DALE ANDREW SUROWITZ | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"10/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3577582352","source_pk":111625,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | JUDITH FRIEDMAN RUDZKI | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3577792647","source_pk":111628,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | GIDEON ORION | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"07/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4082049283","source_pk":111629,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | ROBERT WALDORF | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4183125768","source_pk":111631,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | P&M HOLDING GROUP LLP (MI) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"11/09/2022","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4385165612","source_pk":111632,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | CITI NATIONAL BANK (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"05/31/2011","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4789185323","source_pk":111633,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | THE BANK OF NEW YORK MELLON CORPORATION (NY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"37","association_date":"09/26/2019","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4789830258","source_pk":111634,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"37","role_text_owner":"5% OR GREATER SECURITY INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | TIMOTHY CARLSON | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"02/08/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4880195460","source_pk":111635,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | NOACHIM MARCO (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"11/03/2014","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4981928876","source_pk":111638,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | REYNALDO LOPEZ | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"03/18/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"5092216663","source_pk":111641,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | FRED N GAINES | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2009","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"5496922643","source_pk":111644,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | SANDRA HELLER | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"10/28/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"5698152460","source_pk":111645,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | CAL-MORTGAGE (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"37","association_date":"08/08/2019","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"5698266831","source_pk":111646,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"37","role_text_owner":"5% OR GREATER SECURITY INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | CHARLETTE OFRECIO | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"07/19/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"6406347657","source_pk":111647,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | ROJEAN KASHANCHI | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2022","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"6608250550","source_pk":111649,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | TERRI BLOOMGARDEN | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7012146186","source_pk":111650,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | ANDERSON HEALTH INFORMATION SYSTEMS, INC. (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"11/18/2019","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7214438845","source_pk":111651,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | CRYSTAL RUDITSKY | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"07/19/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7315324183","source_pk":111652,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | LARISSA STEPANIANS | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"02/04/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7416381231","source_pk":111655,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | RICHARD FRANKIE | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"07/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8921509506","source_pk":111658,"type_owner":"I","enrollment_id":"O20120111000437","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
| ← owns | MOSS ADAMS LLP (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"03/14/2012","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9234637075","source_pk":111659,"type_owner":"O","enrollment_id":"O20120111000437","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING"} |
Current record
Current claims returned for this entity, grouped by provenance subject. The table exposes the source identifier recorded for each claim.
org · 1417950163 JSON
| Metric | Value | Asserted | Source |
|---|---|---|---|
| dba_name | <UNAVAIL> | 2026-06-10 | Centers for Medicare & Medicaid ServicesNPPES NPI Registry (individuals) 202602 publisher: Centers for Medicare & Medicaid Services retrieved: 2026-06-10 sha256: 8b5267e250fd4df6… claim API: JSON |
| enumeration_date | 2005-05-24 | 2026-06-10 | Centers for Medicare & Medicaid ServicesNPPES NPI Registry (individuals) 202602 publisher: Centers for Medicare & Medicaid Services retrieved: 2026-06-10 sha256: 8b5267e250fd4df6… claim API: JSON |
| legal_business_name | GRANCELL VILLAGE OF THE LOS ANGELES JEWISH HOME FOR THE AGING | 2026-06-10 | Centers for Medicare & Medicaid ServicesNPPES NPI Registry (individuals) 202602 publisher: Centers for Medicare & Medicaid Services retrieved: 2026-06-10 sha256: 8b5267e250fd4df6… claim API: JSON |
| practice_state | CA | 2026-06-10 | Centers for Medicare & Medicaid ServicesNPPES NPI Registry (individuals) 202602 publisher: Centers for Medicare & Medicaid Services retrieved: 2026-06-10 sha256: 8b5267e250fd4df6… claim API: JSON |
| primary_taxonomy | 313M00000X | 2026-06-10 | Centers for Medicare & Medicaid ServicesNPPES NPI Registry (individuals) 202602 publisher: Centers for Medicare & Medicaid Services retrieved: 2026-06-10 sha256: 8b5267e250fd4df6… claim API: JSON |
Provider screening signals
NPI-keyed source families read directly for 1417950163: federal and state integrity lists, CMS Open Payments, Order and Referring eligibility, Medicare opt-out, and enrollment revalidation. Cells expose the source and provenance fields supplied by the selected record. A screening aid — re-confirm any match against the primary source before acting; absence means nothing on file in the data Fonteum currently holds, never a guarantee none exists.
Sanctions & integrity
Coverage staleExclusion coverage is stale or cannot be reconciled to an attested source artifact. This result is indeterminate and must not be treated as a clearance; check the current issuing-agency lists.
- Coverage status: indeterminate
- Screened 26 integrity lists; no negative determination was made.
14-tuple provenance (26)
Industry payments
None on file0 CMS Open Payments records on file for this NPI.
14-tuple provenance (1)
Order & referring eligibility
None on fileNo CMS Order and Referring record on file for this NPI.
14-tuple provenance (1)
Medicare opt-out
None on fileNo CMS Medicare opt-out affidavit on file for this NPI.
14-tuple provenance (1)
Revalidation
On file1 Medicare enrollment record on file.
- Due date: TBD upstream — not due within the ensuing six months.
14-tuple provenance (1)
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=…