At most one dimension to group by. Omit or pass [] for a summary. For metric=sov when dimensions are omitted or dimensions=[date] or dimensions=[engine], sov, mentions, and runs are trailing-window snapshot values. granularity selects day, week, or month buckets and rollingWindow counts those buckets; they default to day and 30. Omit dimensions to return the latest product snapshot, use dimensions=[date] for one snapshot per date, or use dimensions=[engine] for the latest snapshot per engine. The window selects eligible snapshot dates; it is not a period aggregation. Custom rolling settings are supported for product, date, and engine SOV series. Do not sum mentions or runs across dated rows because their rolling windows overlap. Capabilities — sov: dimensions [date, prompt, topic, engine, competitor], filters [viewId, promptId, topicId, engine, regionId], sortBy depends on the dimension (prompt, topic, and engine rows sort by sov, mentions, runs, or label; competitor rows sort by sov or mentions, desc only; date and ungrouped results do not sort); citations: dimensions [source, category, type, author, model, date], filters [viewId, topicId, regionId, category, contentType, model, author, searchTerm, productMentioned], sortBy [citations, mentions]; traffic: dimensions [date, page, model, category], filters [trafficType, provider, category]; sentiment: dimensions [prompt], filters [viewId, promptId, topicId].