{"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":"4703395","name":"Plant 21"},"operator":{"type":"operator","id":"L16472","name":"Milestone Materials"},"controller":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"object":{"type":"mine","id":"4703395","name":"Plant 21"},"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":"4703395|M00893|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0054661","name":"Opelt Sand & Gravel"},"object":{"type":"mine","id":"4703395","name":"Plant 21"},"validFrom":"2004-09-15","validTo":"2026-01-27","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703395|0054661|2004-09-15|2026-01-27"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11449","name":"Mary J  Opelt"},"object":{"type":"mine","id":"4703395","name":"Plant 21"},"validFrom":"2004-09-15","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703395|M11449|2004-09-15|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11449","name":"Mary J  Opelt"},"object":{"type":"operator","id":"0054661","name":"Opelt Sand & Gravel"},"validFrom":"2004-09-15","validTo":"2026-01-27","current":false,"derived":true,"evidenceMineId":"4703395","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703395|0054661|2004-09-15|M11449|2004-09-15|151447"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16472","name":"Milestone Materials"},"object":{"type":"mine","id":"4703395","name":"Plant 21"},"validFrom":"2026-01-28","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703395|L16472|2026-01-28|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"object":{"type":"operator","id":"L16472","name":"Milestone Materials"},"validFrom":"2026-01-28","validTo":null,"current":true,"derived":true,"evidenceMineId":"4703395","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703395|L16472|2026-01-28|M00893|1950-01-01|115760"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4703395","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"}}