Duplicate findings on partitioned tables create noise

# Duplicate findings on partitioned tables create noise

## Description
When tables are partitioned, the same rule is emitted for each child partition, so one logical issue shows up many times and adds a lot of noise.

## Suggestion (question)
Would you consider adding an output mode that deduplicates identical findings across partitions—e.g., group by the parent table and list the affected partitions under it? This would keep reports concise while preserving detail.

The issue does not name files, tests, or an entry point. Start by reading the repository documentation and locating how findings for partitioned tables are generated and reported. Done means identical findings across partitions can be grouped by parent table while still listing affected partitions; the grouping and output-mode details need clarification.

Written by the indexing model from the issue text.