Based on the provided text, here are the steps to create a read-only user in PostgreSQL:

1. Connect to your PostgreSQL server using an admin username/password combination.

2. Use this command within psql:

```sql

CREATE ROLE WITH LOGIN;

```

Replace `` with whatever name you choose for your new role, but do not use the reserved words `postgres` or any other existing roles/tables in your database.

3. Then grant read-only access to this newly created role on all tables within a particular schema like so:

```sql

GRANT SELECT ON TABLESPACE .* TO :rolename;

```

4. Finally, commit the changes made by running:

```

COMMIT;

```

Here's an example of how this would look like in practice:

Let's say we want to create a read-only user named 'read_only_user' with access only to the 'public' schema. Here are the commands:

```sql

CREATE ROLE read_only_user WITH LOGIN;

GRANT SELECT ON TABLESPACE public.* TO read_only_user;

```

After running these two queries, you should now be able to log in as 'postgres' (or whatever username and password combination has been set up for your PostgreSQL server) using the following command:

```sql

psql -U 'your_username' -d 'database_name'

```

Once connected, try executing a SELECT statement against any table within the public schema. You should not receive an error message indicating that you do not have permission to access those tables.

Remember that creating roles and granting permissions only grants privileges at the database level; if you want these changes to be applied across all databases on your server simultaneously (which might not always be desirable!), then use `GRANT` statements instead of `ALTER ROLE`.

Dbeaver postgresql create table