refactor: for xcdb make relation virtual

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb/src/services/columns.service.ts

@@ -1553,6 +1553,11 @@ export class ColumnsService {
 
         childColumn = await Column.get({ colId: id });
 
+        // if xcdb base then treat as virtual relation to avoid creating foreign key
+        if (param.base.is_meta) {
+          (param.column as LinkToAnotherColumnReqType).virtual = true;
+        }
+
         // ignore relation creation if virtual
         if (!(param.column as LinkToAnotherColumnReqType).virtual) {
           foreignKeyName = generateFkName(parent, child);