{"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":"4401714","name":"No 2"},"operator":{"type":"operator","id":"P05605","name":"Walker Coal Company"},"controller":{"type":"controller","id":"C04672","name":"Whited James & Chester--Jerry Musick"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P00955","name":"Little Byrd Coal Company"},"object":{"type":"mine","id":"4401714","name":"No 2"},"validFrom":"1950-01-01","validTo":"1977-08-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4401714|P00955|1950-01-01|1977-08-10"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00799","name":"Fuller Rual"},"object":{"type":"mine","id":"4401714","name":"No 2"},"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":"4401714|C00799|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00799","name":"Fuller Rual"},"object":{"type":"operator","id":"P00955","name":"Little Byrd Coal Company"},"validFrom":"1950-01-01","validTo":"1977-08-10","current":false,"derived":true,"evidenceMineId":"4401714","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4401714|P00955|1950-01-01|C00799|1950-01-01|50124"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04672","name":"Whited James & Chester--Jerry Musick"},"object":{"type":"mine","id":"4401714","name":"No 2"},"validFrom":"1977-02-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4401714|C04672|1977-02-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P05605","name":"Walker Coal Company"},"object":{"type":"mine","id":"4401714","name":"No 2"},"validFrom":"1977-08-11","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4401714|P05605|1977-08-11|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04672","name":"Whited James & Chester--Jerry Musick"},"object":{"type":"operator","id":"P05605","name":"Walker Coal Company"},"validFrom":"1977-08-11","validTo":null,"current":true,"derived":true,"evidenceMineId":"4401714","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4401714|P05605|1977-08-11|C04672|1977-02-01|66428"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4401714","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"}}