feat: finish back-end work (untested)

api/queries/UserQueries.go

@@ -31,6 +31,9 @@ FROM
 	ordr_user
 	INNER JOIN ordr_position
 	ON job_position = ordr_position.id
+WHERE
+	user_name LIKE '%' || $3 ||'%'
+	AND position_name LIKE '%' || $4 || '%'
 ORDER BY user_name
 OFFSET $1
 LIMIT $2;
@@ -45,7 +48,7 @@ SELECT
 	is_admin::boolean
 FROM
 	ordr_user
-	INNER JOIN ordr_position
+	LEFT JOIN ordr_position
 	ON job_position = ordr_position.id
 	AND ordr_user.sub_id = $1;
 `