{"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":"1601346","name":"DREDGE GEORGIA\"\""},"operator":{"type":"operator","id":"L16307","name":"Maintenance Dredging Inc"},"controller":{"type":"controller","id":"M12476","name":"Glen D  Smith; Gary L  Smith Sr"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16307","name":"Maintenance Dredging Inc"},"object":{"type":"mine","id":"1601346","name":"DREDGE GEORGIA\"\""},"validFrom":"1999-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1601346|L16307|1999-03-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M12476","name":"Glen D  Smith  et al"},"object":{"type":"mine","id":"1601346","name":"DREDGE GEORGIA\"\""},"validFrom":"1999-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1601346|M12476|1999-03-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M12476","name":"Glen D  Smith  et al"},"object":{"type":"operator","id":"L16307","name":"Maintenance Dredging Inc"},"validFrom":"1999-03-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1601346","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1601346|L16307|1999-03-01|M12476|1999-03-01|153818"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M12476","name":"Gary L  Smith Sr  et al"},"object":{"type":"operator","id":"L16307","name":"Maintenance Dredging Inc"},"validFrom":"1999-03-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1601346","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1601346|L16307|1999-03-01|M12476|1999-03-01|153819"}}],"coverage":{"historyRecords":2,"edgeCount":4,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1601346","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"}}