fix CH return.

lib/db.js

@@ -277,14 +277,22 @@ export async function rawQueryClickhouse(query, params = [], debug = false) {
   return clickhouse.query(formattedQuery).toPromise();
 }
 
+export async function findUnique(data) {
+  if (data.length > 1) {
+    throw `${data.length} records found when expecting 1.`;
+  }
+
+  return data[0] ?? null;
+}
+
 export async function runAnalyticsQuery(queries) {
   const db = getAnalyticsDatabase();
 
   if (db === POSTGRESQL || db === MYSQL) {
-    return queries[`${RELATIONAL}`]();
+    return queries[RELATIONAL]();
   }
 
   if (db === CLICKHOUSE) {
-    return queries[`${CLICKHOUSE}`]();
+    return queries[CLICKHOUSE]();
   }
 }