{"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":"2026-10-17T05:35:58.500035+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":"1202038","name":"Waverly Sand & Gravel"},"operator":{"type":"operator","id":"L16197","name":"Martin Marietta Materials Inc"},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"1202038","name":"Waverly Sand & Gravel"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|M00174|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L12247","name":"Waverly Aggregate Inc"},"object":{"type":"mine","id":"1202038","name":"Waverly Sand & Gravel"},"validFrom":"1988-10-01","validTo":"1991-04-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L12247|1988-10-01|1991-04-07"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09411","name":"John  Loudermilk"},"object":{"type":"mine","id":"1202038","name":"Waverly Sand & Gravel"},"validFrom":"1988-10-01","validTo":"1991-04-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|M09411|1988-10-01|1991-04-07"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09411","name":"John  Loudermilk"},"object":{"type":"operator","id":"L12247","name":"Waverly Aggregate Inc"},"validFrom":"1988-10-01","validTo":"1991-04-07","current":false,"derived":true,"evidenceMineId":"1202038","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L12247|1988-10-01|M09411|1988-10-01|146361"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"object":{"type":"mine","id":"1202038","name":"Waverly Sand & Gravel"},"validFrom":"1991-04-08","validTo":"2005-05-19","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L00208|1991-04-08|2005-05-19"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"validFrom":"1991-04-08","validTo":"2005-05-19","current":false,"derived":true,"evidenceMineId":"1202038","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L00208|1991-04-08|M00174|1950-01-01|105774"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16197","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"1202038","name":"Waverly Sand & Gravel"},"validFrom":"2005-05-20","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L16197|2005-05-20|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L16197","name":"Martin Marietta Materials Inc"},"validFrom":"2005-05-20","validTo":null,"current":true,"derived":true,"evidenceMineId":"1202038","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1202038|L16197|2005-05-20|M00174|1950-01-01|105775"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1202038","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}