Start an Impact Simulation against historical, uploaded, or inline data.

dataset.type and dataset.source are BOTH required, and must be paired: HISTORICAL → source EXECUTION_LOGS, with dataset.from / dataset.to (yyyy-MM-dd, whole days in the organization time zone, both inclusive) UPLOADED → source S3_BUCKET, with dataset.path (the path returned by lexq_dataset_upload) MANUAL → source REQUEST_BODY, with dataset.manualData (array of fact records)

options.maxRecords: number (max 100000). When omitted, HISTORICAL and UPLOADED run at most 1000 records and MANUAL runs every record sent. options.baselinePolicyVersionId: uuid (optional, for baseline comparison) options.includeRuleStats: boolean options.metricConfig: optional — omit for plain execution count. To aggregate a fact, pass { "targetVariable": "", "aggregationType": "COUNT" | "SUM" | "AVG" }

Example (uploaded dataset): { "policyVersionId": "", "dataset": { "type": "UPLOADED", "source": "S3_BUCKET", "path": "" }, "options": { "baselinePolicyVersionId": "", "includeRuleStats": true, "maxRecords": 10000 } }

Example (historical): { "policyVersionId": "", "dataset": { "type": "HISTORICAL", "source": "EXECUTION_LOGS", "from": "2026-01-01", "to": "2026-01-31" }, "options": { "baselinePolicyVersionId": "", "includeRuleStats": true } }