{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-13T11:19:05.459773+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"0203176","name":"Combs Materials DBA Gagnons Sand & Grave"},"operator":{"type":"operator","id":"0099845","name":"Gagnons Sand & Gravel"},"controller":{"type":"controller","id":"0084273","name":"Donald  Gagnon"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0082426","name":"Vista Materials"},"object":{"type":"mine","id":"0203176","name":"Combs Materials DBA Gagnons Sand & Grave"},"validFrom":"2007-07-24","validTo":"2009-04-08","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0082426|2007-07-24|2009-04-08"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0069553","name":"HC Landings LLC"},"object":{"type":"mine","id":"0203176","name":"Combs Materials DBA Gagnons Sand & Grave"},"validFrom":"2007-07-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0069553|2007-07-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0069553","name":"HC Landings LLC"},"object":{"type":"operator","id":"0082426","name":"Vista Materials"},"validFrom":"2007-07-24","validTo":"2009-04-08","current":false,"derived":true,"evidenceMineId":"0203176","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0082426|2007-07-24|0069553|2007-07-24|9904"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0099845","name":"Gagnons Sand & Gravel"},"object":{"type":"mine","id":"0203176","name":"Combs Materials DBA Gagnons Sand & Grave"},"validFrom":"2009-04-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0099845|2009-04-09|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0084273","name":"Donald  Gagnon"},"object":{"type":"mine","id":"0203176","name":"Combs Materials DBA Gagnons Sand & Grave"},"validFrom":"2009-04-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0084273|2009-04-09|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0084273","name":"Donald  Gagnon"},"object":{"type":"operator","id":"0099845","name":"Gagnons Sand & Gravel"},"validFrom":"2009-04-09","validTo":null,"current":true,"derived":true,"evidenceMineId":"0203176","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0203176|0099845|2009-04-09|0084273|2009-04-09|13340"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0203176","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}