[3222] seems to be asking the same support of pglite+pgvector in drizzle-studio. I feel just adding the extension vector in a hardcoded way will help unblock the usage.
const { vector } = await import('@electric-sql/pglite/vector'); const pglite = new PGlite(normalisePGliteUrl(credentials.url), { extensions: { vector } });

This will enable the use of

1. SQL runner - creation of tables with vectors, sparsevec etc.

2. table browser.

3. Drizzle Runner (partially) - works for spasevec but not vector.
   Drizzle runner with vector db.select().from(items), throws Cannot read properties of undefined (reading 'dimensions'). This is due to the fact that schema files are inferred from the actual table, instead of supplied schema files. In this process it looses the dimension even though in original schema files it was passed.
   Fixing this requires updating code in drizzle-orm schema generation around schema inference from table.

Ideally I would like to initialize drizzle in a common place and pass it to drizzle.config.ts as well use the same in the application in order to avoid duplication, plus I can control all the plugins.
But still enabling pgvector with pglite in drizzle-studio should be higher priority.

Created this PR 3824.