Replace f-string interpolation with Databricks parameterized queries
using StatementParameterListItem in delete(), update(), and insert()
methods. Add column name validation in update() to reject invalid SQL
identifiers from payload keys. Embedding vectors remain inlined as
they are numeric arrays not supported by the parameterization API.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>