How to set on delete cascade in .graphql file about graphback HOT 3 OPEN

mutation {
  createNote(input: { title: "the gql 2 !" }) {
    id
    title
  }
}

{
  "data": {
    "createNote": {
      "id": "2",
      "title": "the gql 2 !"
    }
  }
}

mutation {
  createComment(input: { noteId: 2, text: "wow " }) {
    id
    text
    note {
      id
      title
    }
  }
}

{
  "data": {
    "createComment": {
      "id": "2",
      "text": "wow",
      "note": {
        "id": "2",
        "title": "the gql 2 !"
      }
    }
  }
}

mutation {
  deleteNote(input: { id: 2 }) {
    id
    title
  }
}

{
  "errors": [
    {
      "message": "delete from \"note\" where \"id\" = $1 returning * - update or delete on table \"note\" violates foreign key constraint \"comment_noteid_foreign\" on table \"comment\"",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "deleteNote"
      ],
      "extensions": {
        "code": "INTERNAL_SERVER_ERROR",
        "exception": {
          "length": 274,
          "name": "error",
          "severity": "ERROR",
          "code": "23503",
          "detail": "Key (id)=(2) is still referenced from table \"comment\".",
          "schema": "public",
          "table": "comment",
          "constraint": "comment_noteid_foreign",
          "file": "ri_triggers.c",
          "line": "2797",
          "routine": "ri_ReportViolation",
          "stacktrace": [
            "error: delete from \"note\" where \"id\" = $1 returning * - update or delete on table \"note\" violates foreign key constraint \"comment_noteid_foreign\" on table \"comment\"",
            "    at Parser.parseErrorMessage (/home/guhan/code/gql-postgress/web3/node_modules/pg-protocol/src/parser.ts:357:11)",
            "    at Parser.handlePacket (/home/guhan/code/gql-postgress/web3/node_modules/pg-protocol/src/parser.ts:186:21)",
            "    at Parser.parse (/home/guhan/code/gql-postgress/web3/node_modules/pg-protocol/src/parser.ts:101:30)",
            "    at Socket.stream.on (/home/guhan/code/gql-postgress/web3/node_modules/pg-protocol/src/index.ts:7:48)",
            "    at Socket.emit (events.js:198:13)",
            "    at Socket.EventEmitter.emit (domain.js:448:20)",
            "    at addChunk (_stream_readable.js:288:12)",
            "    at readableAddChunk (_stream_readable.js:269:11)",
            "    at Socket.Readable.push (_stream_readable.js:224:10)",
            "    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)"
          ]
        }
      }
    }
  ],
  "data": {
    "deleteNote": null
  }
}