Builds the property’s actual click-through-rate curve bucketed by average position (1-20) and compares each bucket to one or more industry benchmarks. Available sources: awr (Advanced Web Ranking 2026), awr2026 (AWR 2026 CTR study, organic across all SERPs), awrAio (same study, SERPs carrying an AI Overview), firstPageSage (First Page Sage 2026), sistrix (Sistrix 2024), backlinko (Backlinko 2019), or "all" (default) to compare against every source at once. Comparing awr2026 with awrAio is the AI Overview click tax for that position. Each bucket reports a benchmarks map (expected CTR per source) and a deltas map (actual minus expected; negative = underperforming); when a single source is selected the bucket also carries flat expectedCtr/ctrDelta. CTR values are percentages (0-100); deltas are percentage points. Served from the GSC Wizard ClickHouse warehouse when available, where every query in the window is measured; otherwise the live Search Console API (see dataSource), which returns only the top 25,000 queries by clicks. truncated: true means that cut was hit: zero-click queries are dropped first, so bucket CTRs read HIGH, not low. scanLimit is the cut applied (null on the warehouse, which has none). Date range is optional: omit startDate/endDate to analyze the last 28 settled days (data lags ~2-3 days).