{"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":"1800172","name":"Walker Strip #4"},"operator":{"type":"operator","id":"P00733","name":"Buffalo Coal Company Inc"},"controller":{"type":"controller","id":"C00609","name":"Carl Del Signore Family Trust"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00609","name":"Carl Del Signore Family Trust"},"object":{"type":"mine","id":"1800172","name":"Walker Strip #4"},"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":"1800172|C00609|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P00734","name":"Overdorff Coal Co"},"object":{"type":"mine","id":"1800172","name":"Walker Strip #4"},"validFrom":"1950-01-01","validTo":"1973-12-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1800172|P00734|1950-01-01|1973-12-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00610","name":"Overdorff Coal Co"},"object":{"type":"mine","id":"1800172","name":"Walker Strip #4"},"validFrom":"1950-01-01","validTo":"1973-12-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1800172|C00610|1950-01-01|1973-12-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00610","name":"Overdorff Coal Co"},"object":{"type":"operator","id":"P00734","name":"Overdorff Coal Co"},"validFrom":"1950-01-01","validTo":"1973-12-31","current":false,"derived":true,"evidenceMineId":"1800172","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1800172|P00734|1950-01-01|C00610|1950-01-01|48435"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P00733","name":"Buffalo Coal Company Inc"},"object":{"type":"mine","id":"1800172","name":"Walker Strip #4"},"validFrom":"1974-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1800172|P00733|1974-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00609","name":"Carl Del Signore Family Trust"},"object":{"type":"operator","id":"P00733","name":"Buffalo Coal Company Inc"},"validFrom":"1974-01-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1800172","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1800172|P00733|1974-01-01|C00609|1950-01-01|48415"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1800172","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"}}