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 | 4981043908 | 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":29405,"type_owner":"O","enrollment_id":"O20050610000335"} |
Graph edges
One-hop relationships — ownership, chain membership, operation — each backed by a federal source row.
| Relationship | Entity | Confidence | Source table | Provenance |
|---|---|---|---|---|
| owns → | INDIAN CREEK HEALTH CARE INC. (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":29405,"type_owner":"O","enrollment_id":"O20050610000335","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":"INDIAN CREEK HEALTH CARE INC."} |
| owns → | SYCAMORE CREEK HEALTHCARE GROUP, INC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":40946,"type_owner":"O","enrollment_id":"O20060816000105","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":"SYCAMORE CREEK HEALTHCARE GROUP, INC"} |
| owns → | SCRANTON HEALTHCARE GROUP, INC. (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":63077,"type_owner":"O","enrollment_id":"O20080215000486","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":"SCRANTON HEALTHCARE GROUP, INC."} |
| owns → | DUNMORE HEALTHCARE GROUP, INC. (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":63104,"type_owner":"O","enrollment_id":"O20080218000064","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":"DUNMORE HEALTHCARE GROUP, INC."} |
| owns → | BROOMALL HEALTHCARE GROUP, INC. (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":68145,"type_owner":"O","enrollment_id":"O20080528000713","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":"BROOMALL HEALTHCARE GROUP, INC."} |
| owns → | CHATHAM ACRES HEALTHCARE GROUP, INC. (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":78150,"type_owner":"O","enrollment_id":"O20090521000493","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":"CHATHAM ACRES HEALTHCARE GROUP, INC."} |
| owns → | GREEN RIDGE HEALTHCARE GROUP, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":102447,"type_owner":"O","enrollment_id":"O20110624000234","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":"GREEN RIDGE HEALTHCARE GROUP, LLC"} |
| owns → | WHITESTONE HEALTHCARE GROUP, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":102481,"type_owner":"O","enrollment_id":"O20110627000027","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":"WHITESTONE HEALTHCARE GROUP, LLC"} |
| owns → | JULIA RIBAUDO HEALTHCARE GROUP, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":102734,"type_owner":"O","enrollment_id":"O20110712000445","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":"JULIA RIBAUDO HEALTHCARE GROUP, LLC"} |
| owns → | AMBLER HEALTHCARE GROUP, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":102898,"type_owner":"O","enrollment_id":"O20110714000486","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":"AMBLER HEALTHCARE GROUP, LLC"} |
| owns → | BRYN MAWR HEALTHCARE GROUP, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":103400,"type_owner":"O","enrollment_id":"O20110809000317","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":"BRYN MAWR HEALTHCARE GROUP, LLC"} |
| owns → | MID-VALLEY SNF HEALTHCARE, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":138011,"type_owner":"O","enrollment_id":"O20140623002078","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":"MID-VALLEY SNF HEALTHCARE LLC"} |
| owns → | KINGSTON SNF HEALTHCARE, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":138043,"type_owner":"O","enrollment_id":"O20140624000187","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":"KINGSTON SNF HEALTHCARE LLC"} |
| owns → | MOUNTAIN CITY NURSING & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"04/01/2025","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":176645,"type_owner":"O","enrollment_id":"O20180220002732","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":"MOUNTAIN CITY NURSING & REHABILITATION CENTER, LLC"} |
| owns → | SPRUCE MANOR NURSING & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"04/01/2025","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":177029,"type_owner":"O","enrollment_id":"O20180223002343","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":"SPRUCE MANOR NURSING & REHABILITATION CENTER, LLC"} |
| owns → | DRESHER HILL HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"04/01/2025","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":177286,"type_owner":"O","enrollment_id":"O20180305002453","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":"DRESHER HILL HEALTH & REHABILITATION CENTER, LLC"} |
| owns → | SUBURBAN WOODS HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":177305,"type_owner":"O","enrollment_id":"O20180306002196","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":"SUBURBAN WOODS HEALTH & REHABILITATION CENTER, LLC"} |
| owns → | STONEBRIDGE HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":178034,"type_owner":"O","enrollment_id":"O20180411000000","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":"STONEBRIDGE HEALTH & REHABILITATION CENTER LLC"} |
| owns → | BROAD MOUNTAIN HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":178055,"type_owner":"O","enrollment_id":"O20180411000043","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":"BROAD MOUNTAIN HEALTH & REHABILITATION CENTER LLC"} |
| owns → | LANGHORNE GARDENS HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":178075,"type_owner":"O","enrollment_id":"O20180411001540","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":"LANGHORNE GARDENS HEALTH & REHABILITATION CENTER, LLC"} |
| owns → | ELKINS CREST HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"04/01/2025","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":178099,"type_owner":"O","enrollment_id":"O20180411003192","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":"ELKINS CREST HEALTH & REHABILITATION CENTER LLC"} |
| owns → | STATESMAN HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":178125,"type_owner":"O","enrollment_id":"O20180412000041","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":"STATESMAN HEALTH & REHABILITATION CENTER LLC"} |
| owns → | SLATE BELT HEALTH & REHABILITATION CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"35","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":181417,"type_owner":"O","enrollment_id":"O20180726001712","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":"SLATE BELT HEALTH & REHABILITATION CENTER LLC"} |
| owns → | PROVIDENCE HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":239772,"type_owner":"O","enrollment_id":"O20230717002601","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":"PROVIDENCE HEALTH & REHAB CENTER, LLC"} |
| owns → | WOODHAVEN HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":240305,"type_owner":"O","enrollment_id":"O20230724003040","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":"WOODHAVEN HEALTH & REHAB CENTER LLC"} |
| owns → | HARMAR VILLAGE HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241503,"type_owner":"O","enrollment_id":"O20230816001905","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":"HARMAR VILLAGE HEALTH & REHAB CENTER, LLC"} |
| owns → | HARMON HOUSE HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241580,"type_owner":"O","enrollment_id":"O20230816002943","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":"HARMON HOUSE HEALTH & REHAB CENTER, LLC"} |
| owns → | EAST END HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"12/31/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241603,"type_owner":"O","enrollment_id":"O20230816003151","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":"EAST END HEALTH & REHAB CENTER, LLC"} |
| owns → | MAPLE HEIGHTS HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241631,"type_owner":"O","enrollment_id":"O20230816003344","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":"MAPLE HEIGHTS HEALTH & REHAB CENTER, LLC"} |
| owns → | KITTANNING HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241722,"type_owner":"O","enrollment_id":"O20230818002695","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":"KITTANNING HEALTH & REHAB CENTER LLC"} |
| owns → | MIDTOWN OAKS HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241849,"type_owner":"O","enrollment_id":"O20230822004036","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":"MIDTOWN OAKS HEALTH & REHAB CENTER, LLC"} |
| owns → | CAPITAL HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":241876,"type_owner":"O","enrollment_id":"O20230823002134","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":"CAPITAL HEALTH & REHAB CENTER, LLC"} |
| owns → | GREENE HEALTH & REHAB CENTER, LLC (PA) | 1.000 | snf_all_owners | evidencerecorded: 2026-06-16 methodology: entity-graph/v1 attributes: {"role_code":"34","association_date":"07/01/2023","percentage_ownership":100} evidence: {"rule":"D-OWNER","owner_pac":"4981043908","source_pk":242178,"type_owner":"O","enrollment_id":"O20230830003475","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":"GREENE HEALTH & REHAB 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=…