Add alias exception for Postgres and SQLite

These are forced by DB to always be referred to as "excluded". A custom alias cannot be set.

Author: sclubricants

system/Database/Postgre/Builder.php

@@ -364,7 +364,11 @@ protected function _upsertBatch(string $table, array $keys, array $values): stri
                 }
             }
 
-            $alias = '"excluded"';
+            $alias = $this->QBOptions['alias'] ?? '"excluded"';
+
+            if (strtolower($alias) !== '"excluded"' && $this->db->DBDebug) {
+                throw new DatabaseException('Postgres alias is always named "excluded". A custom alias cannot be used.');
+            }
 
             $updateFields = $this->QBOptions['updateFields'] ?? $this->updateFields($keys, false, $constraints)->QBOptions['updateFields'] ?? [];
 

system/Database/SQLite3/Builder.php

@@ -164,7 +164,11 @@ protected function _upsertBatch(string $table, array $keys, array $values): stri
                 return ''; // @codeCoverageIgnore
             }
 
-            $alias = '`excluded`';
+            $alias = $this->QBOptions['alias'] ?? '`excluded`';
+
+            if (strtolower($alias) !== '"excluded"' && $this->db->DBDebug) {
+                throw new DatabaseException('SQLite alias is always named "excluded". A custom alias cannot be used.');
+            }
 
             $updateFields = $this->QBOptions['updateFields'] ??
                 $this->updateFields($keys, false, $constraints)->QBOptions['updateFields'] ??