Scope sub-third-parties per parent

Replace the many-to-many junction table with a direct
parent_third_party_id foreign key on third_parties. Each
sub-third-party now belongs to exactly one parent, making
duplicates across parents independent entities.

Replace the firstLevel boolean with an integer level field
(1 = direct, 2+ = parent level + 1) to support arbitrary
nesting depth.

Remove the createThirdPartyThirdPartyMapping and
deleteThirdPartyThirdPartyMapping mutations, the CLI
link/unlink commands, and the corresponding MCP tools.
Creating a child third party now just requires passing
parentThirdPartyId on the existing createThirdParty mutation.

The frontend walks the parentThirdParty chain to build
display names like "Name (Ancestor1/Ancestor2)" and shows
clickable ancestor links on the detail page.

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

packages/n8n-node/nodes/Probo/actions/thirdParty/create.operation.ts

@@ -177,19 +177,19 @@ export const description: INodeProperties[] = [
 				type: 'string',
 				default: '',
 			},
+			{
+				displayName: 'Parent Third Party ID',
+				name: 'parentThirdPartyId',
+				type: 'string',
+				default: '',
+				description: 'The ID of the parent third party (creates a child relationship; level is derived from the parent)',
+			},
 			{
 				displayName: 'Privacy Policy URL',
 				name: 'privacyPolicyUrl',
 				type: 'string',
 				default: '',
 			},
-			{
-				displayName: 'Root',
-				name: 'firstLevel',
-				type: 'boolean',
-				default: false,
-				description: 'Whether this is a first-level third party',
-			},
 			{
 				displayName: 'Security Page URL',
 				name: 'securityPageUrl',
@@ -256,7 +256,7 @@ export async function execute(
 		trustPageUrl?: string;
 		certifications?: string;
 		countries?: string;
-		firstLevel?: boolean;
+		parentThirdPartyId?: string;
 	};
 
 	const query = `
@@ -283,7 +283,7 @@ export async function execute(
 						certifications
 						countries
 						showOnTrustCenter
-						firstLevel
+						level
 						createdAt
 						updatedAt
 					}
@@ -312,7 +312,10 @@ export async function execute(
 	if (additionalFields.subprocessorsListUrl) input.subprocessorsListUrl = additionalFields.subprocessorsListUrl;
 	if (additionalFields.securityPageUrl) input.securityPageUrl = additionalFields.securityPageUrl;
 	if (additionalFields.trustPageUrl) input.trustPageUrl = additionalFields.trustPageUrl;
-	if (additionalFields.firstLevel !== undefined) input.firstLevel = additionalFields.firstLevel;
+	if (additionalFields.parentThirdPartyId) {
+		// The server derives the level from the parent (parent.level + 1).
+		input.parentThirdPartyId = additionalFields.parentThirdPartyId;
+	}
 	if (additionalFields.certifications) {
 		input.certifications = additionalFields.certifications.split(',').map((c) => c.trim()).filter(Boolean);
 	}

packages/n8n-node/nodes/Probo/actions/thirdParty/getAll.operation.ts

@@ -74,11 +74,11 @@ export const description: INodeProperties[] = [
 		},
 		options: [
 			{
-				displayName: 'Filter by Root',
-				name: 'filterFirstLevel',
-				type: 'boolean',
-				default: false,
-				description: 'Whether to filter by first-level third parties only',
+				displayName: 'Filter by Level',
+				name: 'filterLevel',
+				type: 'number',
+				default: 0,
+				description: 'Filter by third party level (1 = direct, 2+ = indirect, 0 = no filter)',
 			},
 			{
 				displayName: 'Include Organization',
@@ -113,7 +113,7 @@ export async function execute(
 	const returnAll = this.getNodeParameter('returnAll', itemIndex) as boolean;
 	const limit = this.getNodeParameter('limit', itemIndex, 50) as number;
 	const options = this.getNodeParameter('options', itemIndex, {}) as {
-		filterFirstLevel?: boolean;
+		filterLevel?: number;
 		includeOrganization?: boolean;
 		includeBusinessOwner?: boolean;
 		includeSecurityOwner?: boolean;
@@ -142,8 +142,8 @@ export async function execute(
 		}`
 		: '';
 
-	const filterVariable = options.filterFirstLevel !== undefined ? ', $filter: ThirdPartyFilter' : '';
-	const filterArgument = options.filterFirstLevel !== undefined ? ', filter: $filter' : '';
+	const filterVariable = options.filterLevel ? ', $filter: ThirdPartyFilter' : '';
+	const filterArgument = options.filterLevel ? ', filter: $filter' : '';
 
 	const query = `
 		query GetThirdParties($organizationId: ID!, $first: Int, $after: CursorKey${filterVariable}) {
@@ -171,7 +171,11 @@ export async function execute(
 								certifications
 								countries
 								showOnTrustCenter
-								firstLevel
+								level
+								ancestors {
+									id
+									name
+								}
 								${organizationFragment}
 								${businessOwnerFragment}
 								${securityOwnerFragment}
@@ -190,8 +194,8 @@ export async function execute(
 	`;
 
 	const variables: IDataObject = { organizationId };
-	if (options.filterFirstLevel) {
-		variables.filter = { firstLevel: true };
+	if (options.filterLevel) {
+		variables.filter = { level: options.filterLevel };
 	}
 
 	const thirdParties = await proboApiRequestAllItems.call(