Execute a synchronous measurement query to retrieve aggregated OOH metrics.

Query formats (choose one):

1. DSL string: Provide a SQL-like query in the query field. When present,
   all other fields are ignored.

   SELECT total(imps), total(reach) FROM audience
   FOR AUDIENCE universe_id=1 WHERE dma_id IN (501)
   DURING '2025-01-01' TO '2025-01-28' GROUP BY operator

2. Structured JSON: Provide the following fields:

   • select (required): At least one metric to calculate (imps, reach, freq, grps, trps)
   • audience (required): Population universe and optional target segment
   • time (required): Date range for the query
   • filters: Geographic, operator, inventory, or campaign constraints
   • groupby: Dimensions to aggregate by (returns one row per unique combination)
   • layer: Exposure measurement layer (ots, lts, audience)
   • model_version_id: Pin to a specific model version for reproducibility

Privacy: Results are subject to aggregation thresholds. Queries returning
results below the minimum threshold will receive a 403 error with code
aggregation_threshold.

For large or complex queries, use the async endpoint (POST /v1/query/async)
to avoid timeouts.