{"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":"0600750","name":"Portable Powerscreen"},"operator":{"type":"operator","id":"L38327","name":"Segalla Sand & Gravel, Inc."},"controller":{"type":"controller","id":"M38327","name":"Marguerite M  Segalla"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M38327","name":"Marguerite M  Segalla et al"},"object":{"type":"mine","id":"0600750","name":"Portable Powerscreen"},"validFrom":"1988-08-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0600750|M38327|1988-08-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L38327","name":"Segalla Sand & Gravel, Inc."},"object":{"type":"mine","id":"0600750","name":"Portable Powerscreen"},"validFrom":"2008-03-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0600750|L38327|2008-03-12|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M38327","name":"Marguerite M  Segalla et al"},"object":{"type":"operator","id":"L38327","name":"Segalla Sand & Gravel, Inc."},"validFrom":"2008-03-12","validTo":null,"current":true,"derived":true,"evidenceMineId":"0600750","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0600750|L38327|2008-03-12|M38327|1988-08-01|167711"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0600750","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"}}