{"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":"1507274","name":"No 2 Mine"},"operator":{"type":"operator","id":"P01893","name":"Ace Mining Corp"},"controller":{"type":"controller","id":"C00145","name":"Potter A C"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P01892","name":"Looney & Fields Coal Company Inc"},"object":{"type":"mine","id":"1507274","name":"No 2 Mine"},"validFrom":"1974-08-19","validTo":"1975-01-06","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|P01892|1974-08-19|1975-01-06"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01593","name":"Looney Ron K & Gary Fields"},"object":{"type":"mine","id":"1507274","name":"No 2 Mine"},"validFrom":"1974-08-19","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|C01593|1974-08-19|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01593","name":"Looney Ron K & Gary Fields"},"object":{"type":"operator","id":"P01892","name":"Looney & Fields Coal Company Inc"},"validFrom":"1974-08-19","validTo":"1975-01-06","current":false,"derived":true,"evidenceMineId":"1507274","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|P01892|1974-08-19|C01593|1974-08-19|55175"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P01893","name":"Ace Mining Corp"},"object":{"type":"mine","id":"1507274","name":"No 2 Mine"},"validFrom":"1975-01-07","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|P01893|1975-01-07|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00145","name":"Potter A C"},"object":{"type":"mine","id":"1507274","name":"No 2 Mine"},"validFrom":"1975-01-07","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|C00145|1975-01-07|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00145","name":"Potter A C"},"object":{"type":"operator","id":"P01893","name":"Ace Mining Corp"},"validFrom":"1975-01-07","validTo":null,"current":true,"derived":true,"evidenceMineId":"1507274","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1507274|P01893|1975-01-07|C00145|1975-01-07|44481"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1507274","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"}}