diff --git a/packages/@n8n/db/src/migrations/common/1765886667897-AddAgentIdForeignKeys.ts b/packages/@n8n/db/src/migrations/common/1765886667897-AddAgentIdForeignKeys.ts
new file mode 100644
index 0000000000000..77a4483de71c0
--- /dev/null
+++ b/packages/@n8n/db/src/migrations/common/1765886667897-AddAgentIdForeignKeys.ts
@@ -0,0 +1,52 @@
+import type { MigrationContext, ReversibleMigration } from '../migration-types';
+
+const table = {
+	agents: 'chat_hub_agents',
+	sessions: 'chat_hub_sessions',
+	messages: 'chat_hub_messages',
+} as const;
+
+export class AddAgentIdForeignKeys1765886667897 implements ReversibleMigration {
+	async up({ schemaBuilder: { addForeignKey }, runQuery, escape }: MigrationContext) {
+		const escapedAgentIdColumn = escape.columnName('agentId');
+
+		// Clean up orphaned agentId references before adding foreign key constraint
+		await runQuery(
+			`UPDATE ${escape.tableName(table.sessions)} SET ${escapedAgentIdColumn} = NULL WHERE ${escapedAgentIdColumn} IS NOT NULL AND ${escapedAgentIdColumn} NOT IN (SELECT id FROM ${escape.tableName(table.agents)})`,
+		);
+		await runQuery(
+			`UPDATE ${escape.tableName(table.messages)} SET ${escapedAgentIdColumn} = NULL WHERE ${escapedAgentIdColumn} IS NOT NULL AND ${escapedAgentIdColumn} NOT IN (SELECT id FROM ${escape.tableName(table.agents)})`,
+		);
+
+		// Add foreign key constraint for agentId in sessions table
+		await addForeignKey(
+			table.sessions,
+			'agentId',
+			[table.agents, 'id'],
+			'FK_chat_hub_sessions_agentId',
+			'SET NULL',
+		);
+		await addForeignKey(
+			table.messages,
+			'agentId',
+			[table.agents, 'id'],
+			'FK_chat_hub_messages_agentId',
+			'SET NULL',
+		);
+	}
+
+	async down({ schemaBuilder: { dropForeignKey } }: MigrationContext) {
+		await dropForeignKey(
+			table.messages,
+			'agentId',
+			[table.agents, 'id'],
+			'FK_chat_hub_messages_agentId',
+		);
+		await dropForeignKey(
+			table.sessions,
+			'agentId',
+			[table.agents, 'id'],
+			'FK_chat_hub_sessions_agentId',
+		);
+	}
+}
diff --git a/packages/@n8n/db/src/migrations/mysqldb/index.ts b/packages/@n8n/db/src/migrations/mysqldb/index.ts
index 92ce829841a47..a4892c7a4c613 100644
--- a/packages/@n8n/db/src/migrations/mysqldb/index.ts
+++ b/packages/@n8n/db/src/migrations/mysqldb/index.ts
@@ -126,6 +126,7 @@ import { AddDynamicCredentialEntryTable1764689388394 } from '../common/176468938
 import { BackfillMissingWorkflowHistoryRecords1765448186933 } from '../common/1765448186933-BackfillMissingWorkflowHistoryRecords';
 import { AddResolvableFieldsToCredentials1765459448000 } from '../common/1765459448000-AddResolvableFieldsToCredentials';
 import { AddIconToAgentTable1765788427674 } from '../common/1765788427674-AddIconToAgentTable';
+import { AddAgentIdForeignKeys1765886667897 } from '../common/1765886667897-AddAgentIdForeignKeys';
 import type { Migration } from '../migration-types';
 
 export const mysqlMigrations: Migration[] = [
@@ -257,4 +258,5 @@ export const mysqlMigrations: Migration[] = [
 	BackfillMissingWorkflowHistoryRecords1765448186933,
 	AddResolvableFieldsToCredentials1765459448000,
 	AddIconToAgentTable1765788427674,
+	AddAgentIdForeignKeys1765886667897,
 ];
diff --git a/packages/@n8n/db/src/migrations/postgresdb/index.ts b/packages/@n8n/db/src/migrations/postgresdb/index.ts
index ebca1b497f788..8d811e1cca7cf 100644
--- a/packages/@n8n/db/src/migrations/postgresdb/index.ts
+++ b/packages/@n8n/db/src/migrations/postgresdb/index.ts
@@ -127,6 +127,7 @@ import { AddDynamicCredentialEntryTable1764689388394 } from '../common/176468938
 import { BackfillMissingWorkflowHistoryRecords1765448186933 } from '../common/1765448186933-BackfillMissingWorkflowHistoryRecords';
 import { AddResolvableFieldsToCredentials1765459448000 } from '../common/1765459448000-AddResolvableFieldsToCredentials';
 import { AddIconToAgentTable1765788427674 } from '../common/1765788427674-AddIconToAgentTable';
+import { AddAgentIdForeignKeys1765886667897 } from '../common/1765886667897-AddAgentIdForeignKeys';
 import type { Migration } from '../migration-types';
 
 export const postgresMigrations: Migration[] = [
@@ -259,4 +260,5 @@ export const postgresMigrations: Migration[] = [
 	AddResolvableFieldsToCredentials1765459448000,
 	AddIconToAgentTable1765788427674,
 	ConvertAgentIdToUuid1765804780000,
+	AddAgentIdForeignKeys1765886667897,
 ];
diff --git a/packages/@n8n/db/src/migrations/sqlite/1765886667897-AddAgentIdForeignKeys.ts b/packages/@n8n/db/src/migrations/sqlite/1765886667897-AddAgentIdForeignKeys.ts
new file mode 100644
index 0000000000000..d0dd16ca94ca0
--- /dev/null
+++ b/packages/@n8n/db/src/migrations/sqlite/1765886667897-AddAgentIdForeignKeys.ts
@@ -0,0 +1,5 @@
+import { AddAgentIdForeignKeys1765886667897 as BaseMigration } from '../common/1765886667897-AddAgentIdForeignKeys';
+
+export class AddAgentIdForeignKeys1765886667897 extends BaseMigration {
+	transaction = false as const;
+}
diff --git a/packages/@n8n/db/src/migrations/sqlite/index.ts b/packages/@n8n/db/src/migrations/sqlite/index.ts
index 226599dda03f0..2e4a6383c2b25 100644
--- a/packages/@n8n/db/src/migrations/sqlite/index.ts
+++ b/packages/@n8n/db/src/migrations/sqlite/index.ts
@@ -48,6 +48,7 @@ import { AddWorkflowVersionColumn1761047826451 } from './1761047826451-AddWorkfl
 import { ChangeDependencyInfoToJson1761655473000 } from './1761655473000-ChangeDependencyInfoToJson';
 import { AddCreatorIdToProjectTable1764276827837 } from './1764276827837-AddCreatorIdToProjectTable';
 import { AddResolvableFieldsToCredentials1764689448000 } from './1764689448000-AddResolvableFieldsToCredentials';
+import { AddAgentIdForeignKeys1765886667897 } from './1765886667897-AddAgentIdForeignKeys';
 import { UniqueWorkflowNames1620821879465 } from '../common/1620821879465-UniqueWorkflowNames';
 import { UpdateWorkflowCredentials1630330987096 } from '../common/1630330987096-UpdateWorkflowCredentials';
 import { AddNodeIds1658930531669 } from '../common/1658930531669-AddNodeIds';
@@ -249,6 +250,7 @@ const sqliteMigrations: Migration[] = [
 	BackfillMissingWorkflowHistoryRecords1765448186933,
 	AddResolvableFieldsToCredentials1764689448000,
 	AddIconToAgentTable1765788427674,
+	AddAgentIdForeignKeys1765886667897,
 ];
 
 export { sqliteMigrations };