implement freelancer alias base management page

and minor fixes

src/database.cpp

@@ -452,6 +452,16 @@ namespace Database {
         return result;
     }
 
+    /*
+     * Executes the prepared statement SELECT_FREELANCER_ALIAS
+     * Takes an open pqxx::connection and the freelancer email to select by
+     */
+    pqxx::result executePreparedStatement_SELECT_FREELANCER_ALIAS(pqxx::connection &connection, const std::string& freelancerEmail) {
+        pqxx::work work(connection);
+        pqxx::result result = work.exec_prepared(PREPARED_STATEMENT_SELECT_FREELANCER_ALIAS, freelancerEmail);
+        work.commit();
+        return result;
+    }
     /*
      * Executes the prepared statement UPDATE_LOGIN_VALIDATION_KEY
      * Takes an open pqxx::connection, the freelancerID and the loginKey to update the entry