Do insert_many and graph_batch beat plain SQL and Cypher loads? #356

Problem

The bindings follow a DSL-first rule: SQL and Cypher through db.query and db.command, with wrappers only where they pay. I want measured evidence of whether insert_many and graph_batch beat plain SQL or Cypher loads, and by how much.

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 1 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 wrapper speedup, or its absence, is stated in the docs and decides whether the wrapper stays

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