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null value in column "session_id" of relation "courseApp_trackevent" violates not-null constraint DETAIL: Failing row contains (3135, null, logout, {}, 2026-04-01 17:58:37.632594+00, 2026-04-01 17:58:37.632972+00, null, Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; C..., null).