Filter out N/A cover_url in backfill select query

Switch node from visual select to executeQuery to exclude
cover_url = 'N/A' entries which are not valid image URLs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

n8n/FileBot_Cover_Backfill.json

@@ -1794,32 +1794,8 @@
     },
     {
       "parameters": {
-        "operation": "select",
-        "schema": {
-          "__rl": true,
-          "value": "n8n",
-          "mode": "list",
-          "cachedResultName": "n8n"
-        },
-        "table": {
-          "__rl": true,
-          "value": "movie_files",
-          "mode": "list",
-          "cachedResultName": "movie_files"
-        },
-        "returnAll": true,
-        "where": {
-          "values": [
-            {
-              "column": "cover_image",
-              "condition": "IS NULL"
-            },
-            {
-              "column": "cover_url",
-              "condition": "IS NOT NULL"
-            }
-          ]
-        },
+        "operation": "executeQuery",
+        "query": "SELECT * FROM n8n.movie_files WHERE cover_image IS NULL AND cover_url IS NOT NULL AND cover_url != 'N/A'",
         "options": {}
       },
       "type": "n8n-nodes-base.postgres",