fix: skip index creation for postgres

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

packages/nocodb/src/version-upgrader/ncXcdbLTARUpgrader.ts

@@ -77,6 +77,8 @@ async function upgradeModelRelations({
             });
           }
 
+          // skip postgres since we were already creating the index while creating the relation
+          if (ncMeta.knex.clientType() !== 'pg') {
             // create a new index for the column
             const indexArgs = {
               columns: [relation.cn],
@@ -85,6 +87,7 @@ async function upgradeModelRelations({
             };
             await sqlClient.indexCreate(indexArgs);
           }
+        }
         break;
     }