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 | 1306165915 | nppes_providers | deterministic_pk | 1.000 | 2026-06-10 | evidencerecorded: 2026-06-10 methodology: entity-graph/v1 evidence: {"rule":"D-NPI","source_pk":"1306165915","entity_type_code":"2"} |
| pecos_enrlmt_id | O20141202002369 | pecos_providers | exact_npi_in_pecos | 1.000 | 2026-06-16 | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 evidence: {"npi":"1306165915","rule":"D-PECOS","enrlmt_id":"O20141202002369"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| ← owns | JULIE REAGAN | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"09/25/2024","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0547760019","source_pk":142321,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | AMERICAN HEALTHCARE REIT INC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"10/01/2018","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0648523829","source_pk":142322,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | KELLY BRAVERMAN | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"12/01/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"0749550994","source_pk":142323,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY REAL ESTATE WHITE OAKS, LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"08/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"1557842424","source_pk":142324,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY REAL ESTATE INVESTMENT TRUST (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"1850688458","source_pk":142325,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY REIT HOLDINGS LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"2769779362","source_pk":142326,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | STEPHEN J BARDOCZI | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"09/03/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3274752563","source_pk":142327,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | JOHN THOMAS (IN) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"07/15/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3375640519","source_pk":142328,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY MANAGEMENT SERVICES LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"07/02/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3577712447","source_pk":142330,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | GAHC3 TRILOGY JV LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"3678860277","source_pk":142331,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | WITHAM MEMORIAL HOSPITAL (IN) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"11/01/2014","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4082523170","source_pk":142332,"type_owner":"O","enrollment_id":"O20141202002369","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":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | DANIEL E SELLERS | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"40","association_date":"06/20/2024","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4183682768","source_pk":142333,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"40","role_text_owner":"CORPORATE OFFICER","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | AMERICAN HEALTHCARE REIT HOLDINGS LP (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"4587951181","source_pk":142334,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | MICHAEL JASON HORNBECKER | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"01/01/2024","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"5496932980","source_pk":142335,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | LEIGH ANN BARNEY | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"39","association_date":"12/01/2015","percentage_ownership":67.6} evidence: {"rule":"D-OWNER","owner_pac":"6901715820","source_pk":142336,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"39","role_text_owner":"LIMITED PARTNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":67.6,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | ANDREA CASTETTER | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"01/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7012380942","source_pk":142337,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | STEPHANIE ANDERSON | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"06/07/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7416205596","source_pk":142338,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY HEALTHCARE MASTER TENANT IX LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"06/26/2025","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7416469515","source_pk":142340,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY HEALTH SERVICES LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"08/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7517067689","source_pk":142341,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | CLAUDE A HAWKINS | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"09/01/2013","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7618195660","source_pk":142342,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | JOHN W BRAND | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"01/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"7719202936","source_pk":142343,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | KEYBANK NATIONAL ASSOCIATION (OH) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"36","association_date":"12/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"7911173927","source_pk":142344,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"36","role_text_owner":"5% OR GREATER MORTGAGE INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | PARAGON OUTPATIENT REHABILITATION SERVICES LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8022272848","source_pk":142346,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY INVESTORS LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8123091402","source_pk":142347,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY HEALTHCARE HOLDINGS INC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"12/01/2015","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8224339387","source_pk":142348,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY PROPCO FINANCE LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"08/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8820500937","source_pk":142349,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY PROPERTY HOLDINGS LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"08/01/2020","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8820508484","source_pk":142350,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | BRETT BAYSTON | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"41","association_date":"01/01/2023","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"8921471855","source_pk":142351,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"41","role_text_owner":"CORPORATE DIRECTOR","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | DAVID W DAVIS | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"39","association_date":"12/31/2019","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436207792","source_pk":142352,"type_owner":"I","enrollment_id":"O20141202002369","role_code_owner":"39","role_text_owner":"LIMITED PARTNERSHIP INTEREST","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | CONTINENTAL MERGER SUB LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"10/01/2021","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9436548096","source_pk":142353,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | TRILOGY HEALTHCARE OF MONTICELLO LLC (KY) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"43","association_date":"11/01/2014","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"9638209646","source_pk":142354,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"43","role_text_owner":"OPERATIONAL/MANAGERIAL CONTROL","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":100,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
| ← owns | GAHC4 TRILOGY JV LLC (CA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"72","association_date":"10/01/2018","percentage_ownership":null} evidence: {"rule":"D-OWNER","owner_pac":"9739432915","source_pk":142355,"type_owner":"O","enrollment_id":"O20141202002369","role_code_owner":"72","role_text_owner":"ADP OF THE SNF","dst_resolved_via":"pecos_enrlmt_id","percentage_ownership_raw":null,"enrollment_organization_name":"WITHAM MEMORIAL HOSPITAL"} |
Current record
Current claims returned for this entity, grouped by provenance subject. The table exposes the source identifier recorded for each claim.
org · 1306165915 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 | 2010-05-21 | 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 | WITHAM MEMORIAL HOSPITAL | 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 | IN | 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 | 314000000X | 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 1306165915: 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=…