Fix soft delete unique constraints to allow reusing unique values after deletion (#13615)

Closes [#1297](https://github.com/twentyhq/core-team-issues/issues/1297)

packages/twenty-server/src/engine/metadata-modules/agent/agent.entity.ts

@@ -8,7 +8,6 @@ import {
   ManyToOne,
   OneToMany,
   PrimaryGeneratedColumn,
-  Unique,
   UpdateDateColumn,
 } from 'typeorm';
 
@@ -22,7 +21,10 @@ import { AgentHandoffEntity } from './agent-handoff.entity';
 
 @Entity('agent')
 @Index('IDX_AGENT_ID_DELETED_AT', ['id', 'deletedAt'])
-@Unique('IDX_AGENT_NAME_WORKSPACE_ID_UNIQUE', ['name', 'workspaceId'])
+@Index('IDX_AGENT_NAME_WORKSPACE_ID_UNIQUE', ['name', 'workspaceId'], {
+  unique: true,
+  where: '"deletedAt" IS NULL',
+})
 export class AgentEntity {
   @PrimaryGeneratedColumn('uuid')
   id: string;