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 | 9436542826 | 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":190,"type_owner":"I","enrollment_id":"O20020820000006"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| owns → | ICC CONVALESCENT LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"06/30/2023","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":190,"type_owner":"I","enrollment_id":"O20020820000006","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"ICC CONVALESCENT LLC"} |
| owns → | COVINA CARE CENTER, INC. (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"06/30/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":5377,"type_owner":"I","enrollment_id":"O20030522000059","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"COVINA CARE CENTER, INC."} |
| owns → | ARTESIA HEALTHCARE, INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":8178,"type_owner":"I","enrollment_id":"O20030821000005","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"ARTESIA HEALTHCARE, INC."} |
| owns → | PICO RIVERA HEALTHCARE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"71","association_date":"06/30/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12601,"type_owner":"I","enrollment_id":"O20031124000518","role_code_owner":"71","role_text_owner":"TRUSTEE OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"PICO RIVERA HEALTHCARE LLC"} |
| owns → | NORWALK HEALTHCARE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12618,"type_owner":"I","enrollment_id":"O20031124000527","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"NORWALK HEALTHCARE LLC"} |
| owns → | MONTROSE HEALTHCARE INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"71","association_date":"06/30/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12953,"type_owner":"I","enrollment_id":"O20031204001194","role_code_owner":"71","role_text_owner":"TRUSTEE OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"MONTROSE HEALTHCARE INC"} |
| owns → | BURBANK HEALTHCARE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12971,"type_owner":"I","enrollment_id":"O20031204001201","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"BURBANK HEALTHCARE LLC"} |
| owns → | CANOGA HEALTHCARE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12984,"type_owner":"I","enrollment_id":"O20031204001203","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"CANOGA HEALTHCARE LLC"} |
| owns → | ABILITY HOMECARE, INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":12997,"type_owner":"I","enrollment_id":"O20031204001210","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"ABILITY HOMECARE, INC."} |
| owns → | PARK ANAHEIM HEALTH CARE, LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":51666,"type_owner":"I","enrollment_id":"O20070716000564","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"PARK ANAHEIM HEALTH CARE, LLC"} |
| owns → | ALDEN ENTERPRISES LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"71","association_date":"06/30/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":73940,"type_owner":"I","enrollment_id":"O20090110000027","role_code_owner":"71","role_text_owner":"TRUSTEE OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"ALDEN ENTERPRISES LLC"} |
| owns → | CHINO VALLEY REHABILITATION CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":75008,"type_owner":"I","enrollment_id":"O20090219000129","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"CHINO VALLEY REHABILITATION CENTER LLC"} |
| owns → | LAUREL WELLNESS AND NURSING CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":77600,"type_owner":"I","enrollment_id":"O20090430000096","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"LAUREL WELLNESS AND NURSING CENTER LLC"} |
| owns → | SHEA HEALTHCARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"01/07/2022","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":86757,"type_owner":"I","enrollment_id":"O20100125000322","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"SHEA HEALTHCARE CENTER LLC"} |
| owns → | COLONIAL CARE CENTER INC. (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":86772,"type_owner":"I","enrollment_id":"O20100125000344","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"COLONIAL CARE CENTER INC."} |
| owns → | MAGNOLIA GARDENS CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"06/30/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":86874,"type_owner":"I","enrollment_id":"O20100126000300","role_code_owner":"35","role_text_owner":"5% OR GREATER INDIRECT OWNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"MAGNOLIA GARDENS CONVALESCENT HOSPITAL LLC"} |
| owns → | COLDWATER CARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":113233,"type_owner":"I","enrollment_id":"O20120130000305","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"COLDWATER CARE CENTER LLC"} |
| owns → | NORMANDIE WILSHIRE RETIREMENT HOTEL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":113263,"type_owner":"I","enrollment_id":"O20120130000528","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"NORMANDIE WILSHIRE RETIREMENT HOTEL LLC"} |
| owns → | CASA BONITA CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":116297,"type_owner":"I","enrollment_id":"O20120308000772","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"CASA BONITA CONVALESCENT HOSPITAL LLC"} |
| owns → | BURLINGTON CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":116355,"type_owner":"I","enrollment_id":"O20120309000222","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"BURLINGTON CONVALESCENT HOSPITAL LLC"} |
| owns → | VIEW PARK CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":116778,"type_owner":"I","enrollment_id":"O20120315000629","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"VIEW PARK CONVALESCENT HOSPITAL, INC"} |
| owns → | TZIPPY CARE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":116795,"type_owner":"I","enrollment_id":"O20120315000788","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"TZIPPY CARE LLC"} |
| owns → | SUNNYVIEW CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":116808,"type_owner":"I","enrollment_id":"O20120315000832","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"SUNNYVIEW CONVALESCENT HOSPITAL LLC"} |
| owns → | BROADWAY MANOR CARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":117209,"type_owner":"I","enrollment_id":"O20120321000813","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"BROADWAY MANOR CARE CENTER, LLC."} |
| owns → | SGV HEALTHCARE INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":119065,"type_owner":"I","enrollment_id":"O20120426000131","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"SGV HEALTHCARE INC"} |
| owns → | NORTHRIDGE CARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":119151,"type_owner":"I","enrollment_id":"O20120426000550","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"NORTHRIDGE CARE CENTER LLC"} |
| owns → | LONGWOOD ENTERPRISES LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":119298,"type_owner":"I","enrollment_id":"O20120427000561","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"LONGWOOD ENTERPRISES LLC"} |
| owns → | CRENSHAW ENTERPRISES LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":122341,"type_owner":"I","enrollment_id":"O20120731000222","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"CRENSHAW ENTERPRISES, INC."} |
| owns → | BEAUMONT MANOR LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":139366,"type_owner":"I","enrollment_id":"O20140821002321","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"BEAUMONT MANOR LLC"} |
| owns → | EASTLAND SUBACUTE AND REHAB LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":155337,"type_owner":"I","enrollment_id":"O20160126001943","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"EASTLAND SUBACUTE AND REHAB LLC"} |
| owns → | MAYFLOWER CARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":155352,"type_owner":"I","enrollment_id":"O20160127000375","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"MAYFLOWER CARE CENTER LLC"} |
| owns → | STUDIO CITY CONVALESCENT HOSPITAL LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":157376,"type_owner":"I","enrollment_id":"O20160406000510","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"STUDIO CITY CONVALESCENT HOSPITAL LLC"} |
| owns → | GREEN ACRES LODGE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":159500,"type_owner":"I","enrollment_id":"O20160809002194","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"GREEN ACRES LODGE LLC"} |
| owns → | IMPERIAL CREST HEALTHCARE CENTER, LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":159513,"type_owner":"I","enrollment_id":"O20160810000649","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"IMPERIAL CREST HEALTHCARE CENTER LLC"} |
| owns → | MEADOWS RIDGE CARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":163994,"type_owner":"I","enrollment_id":"O20170214002583","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"MEADOWS RIDGE CARE CENTER LLC"} |
| owns → | SANTA FE LODGE LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"01/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":169222,"type_owner":"I","enrollment_id":"O20170622001835","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"SANTA FE LODGE LLC"} |
| owns → | CERRITOS VISTA HEALTHCARE CENTER LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"44","association_date":"01/07/2022","percentage_ownership":0} evidence: {"rule":"D-OWNER","owner_pac":"9436542826","source_pk":175128,"type_owner":"I","enrollment_id":"O20171219003324","role_code_owner":"44","role_text_owner":"OTHER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":0,"enrollment_organization_name":"CERRITOS VISTA HEALTHCARE CENTER 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=…