{"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":"1511154","name":"Constance Yard"},"operator":{"type":"operator","id":"L10075","name":"Interstate Asphalt Company"},"controller":{"type":"controller","id":"M07873","name":"Sparks D J"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"1511154","name":"Constance Yard"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|M00174|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"object":{"type":"mine","id":"1511154","name":"Constance Yard"},"validFrom":"1978-03-09","validTo":"1987-11-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|L00208|1978-03-09|1987-11-16"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"validFrom":"1978-03-09","validTo":"1987-11-16","current":false,"derived":true,"evidenceMineId":"1511154","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|L00208|1978-03-09|M00174|1950-01-01|105959"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L10075","name":"Interstate Asphalt Company"},"object":{"type":"mine","id":"1511154","name":"Constance Yard"},"validFrom":"1987-11-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|L10075|1987-11-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07873","name":"Sparks D J"},"object":{"type":"mine","id":"1511154","name":"Constance Yard"},"validFrom":"1987-11-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|M07873|1987-11-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07873","name":"Sparks D J"},"object":{"type":"operator","id":"L10075","name":"Interstate Asphalt Company"},"validFrom":"1987-11-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"1511154","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1511154|L10075|1987-11-17|M07873|1987-11-17|142137"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1511154","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"}}