fix: update pgbouncer.get_auth

Author: kangmingtay

migrations/db/migrations/20250417190610_update_pgbouncer_get_auth.sql

@@ -0,0 +1,24 @@
+-- migrate:up
+
+create or replace function pgbouncer.get_auth(p_usename text) returns table (username text, password text)
+    language plpgsql security definer
+    as $$
+begin
+    raise debug 'PgBouncer auth request: %', p_usename;
+
+    return query
+    select 
+        rolname::text, 
+        case when rolvaliduntil < now() 
+            then null 
+            else rolpassword::text 
+        end 
+    from pg_authid 
+    where rolname=$1 and rolcanlogin;
+end;
+$$;
+
+-- from migrations/db/migrations/20250312095419_pgbouncer_ownership.sql
+grant execute on function pgbouncer.get_auth(p_usename text) to postgres;
+
+-- migrate:down