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Add pre-merge row counting in Invoke-DuckDBUpsert using EXISTS checks against the staging table to distinguish inserts (no matching PK) from updates (matching PK found). Counts are accumulated across batches in Add-RowsToDuckDB, which now outputs a PSCustomObject with RowsInserted, RowsUpdated, RowsTotal, and TableName properties. https://claude.ai/code/session_01FPJ1v9m8XUHqT8GEUAX4Ey
Add nine new tests in the Add-RowsToDuckDB describe block covering the result object introduced by the insert/update tracking change: property presence, TableName value, all-insert plain INSERT, first-load UPSERT, all-updates UPSERT, mixed insert+update split, multi-batch insert and update accumulation, and composite (multi-column) PK counting. https://claude.ai/code/session_01FPJ1v9m8XUHqT8GEUAX4Ey
…-bbLVA Track insert and update counts separately in Add-RowsToDuckDB
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