{"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":"1600962","name":"Bailey Dredge"},"operator":{"type":"operator","id":"L05705","name":"B & B Sand & Gravel"},"controller":{"type":"controller","id":"M04610","name":"Bailey Melvin"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02943","name":"David E  Joshlin"},"object":{"type":"mine","id":"1600962","name":"Bailey Dredge"},"validFrom":"1950-01-01","validTo":"1981-09-01","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|M02943|1950-01-01|1981-09-01"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03666","name":"Gravel Production Company"},"object":{"type":"mine","id":"1600962","name":"Bailey Dredge"},"validFrom":"1980-01-01","validTo":"1981-09-01","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|L03666|1980-01-01|1981-09-01"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02943","name":"David E  Joshlin"},"object":{"type":"operator","id":"L03666","name":"Gravel Production Company"},"validFrom":"1980-01-01","validTo":"1981-09-01","current":false,"derived":true,"evidenceMineId":"1600962","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|L03666|1980-01-01|M02943|1950-01-01|127401"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L05705","name":"B & B Sand & Gravel"},"object":{"type":"mine","id":"1600962","name":"Bailey Dredge"},"validFrom":"1981-09-02","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|L05705|1981-09-02|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04610","name":"Bailey Melvin"},"object":{"type":"mine","id":"1600962","name":"Bailey Dredge"},"validFrom":"1981-09-02","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|M04610|1981-09-02|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04610","name":"Bailey Melvin"},"object":{"type":"operator","id":"L05705","name":"B & B Sand & Gravel"},"validFrom":"1981-09-02","validTo":null,"current":true,"derived":true,"evidenceMineId":"1600962","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600962|L05705|1981-09-02|M04610|1981-09-02|132366"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1600962","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"}}