faster content hash computation via in memory sorting

src/services/content_hash.js

@@ -13,8 +13,10 @@ const Option = require('../entities/option');
 
 function getSectorHashes(tableName, primaryKeyName, whereBranch) {
     const hashes = sql.getRows(`SELECT ${primaryKeyName} AS id, hash FROM ${tableName}`
-        + (whereBranch ? `WHERE ${whereBranch} ` : '')
-        + ` ORDER BY ${primaryKeyName}`);
+        + (whereBranch ? ` WHERE ${whereBranch} ` : ''));
+
+    // sorting is faster in memory
+    hashes.sort((a, b) => a.id < b.id ? -1 : 1);
 
     const map = {};