fix: add callout to resolve studio error

content/200-orm/400-tools/06-prisma-studio.mdx

@@ -172,6 +172,32 @@ Support for CockroachDB and MongoDB is not currently available but may be added
 
 ## Troubleshooting
 
+### PostgreSQL: "unrecognized configuration parameter 'schema'" error
+
+When connecting to PostgreSQL databases, you may encounter this error if your connection string includes the `schema` query parameter:
+
+```terminal wrap
+unrecognized configuration parameter "schema"
+```
+
+This happens because the new Studio is standalone and passes your connection URL directly to the PostgreSQL driver without any processing. The URL you provide—whether via `prisma.config.ts` or the `--url` flag—must be a valid PostgreSQL connection string that only uses [standard PostgreSQL connection parameters](https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-PARAMKEYWORDS).
+
+The `schema` parameter was a custom Prisma ORM parameter that worked in v6 and earlier, but PostgreSQL itself doesn't recognize it.
+
+To resolve this issue, use the standard `search_path` parameter instead:
+
+```terminal
+# ❌ This will cause an error
+postgresql://user:password@host:port/database?schema=my_schema
+
+# ✅ Use this instead  
+postgresql://user:password@host:port/database?options=-c%20search_path%3Dmy_schema
+```
+
+Alternatively, you can remove the schema parameter entirely if you're using the default `public` schema, as PostgreSQL defaults to it automatically.
+
+For more details, see the related [GitHub issue](https://github.com/prisma/studio/issues/1363#issuecomment-3561040763).
+
 ### Terminal: Failed to run script / Error in Prisma Client request
 
 Caching issues may cause Prisma Studio to use an older version of the query engine. You may see the following error: