Bulk-load table: UNIQUE or UNIQUE_HASH before against after the load, per wheel #362

Problem

I want the cost of creating UNIQUE and UNIQUE_HASH indexes before versus after a bulk load, across row shapes and graph loads, on each wheel.

It is one row of the bindings study list. It was held on stale pins and re-pins after the 26.11.1 release wheels exist.

Priority: P3 (tier 3 of the re-pin order).

Acceptance

• The study is re-pinned to the 26.11.1 pair and dry-run
• It runs and is scored
• The docs say when to create the index

Results and the scorer output go in this issue as comments. Numbers are generated by script from the result files, never typed.