feat: Add AI Agent workflow action node (#12650)

https://github.com/user-attachments/assets/8593e488-cb00-4fd2-b903-5ba5766e0254

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

@@ -0,0 +1,56 @@
+import {
+  Column,
+  CreateDateColumn,
+  DeleteDateColumn,
+  Entity,
+  Index,
+  JoinColumn,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+import { Relation } from 'src/engine/workspace-manager/workspace-sync-metadata/interfaces/relation.interface';
+
+import { ModelId } from 'src/engine/core-modules/ai/constants/ai-models.const';
+import { Workspace } from 'src/engine/core-modules/workspace/workspace.entity';
+
+@Entity('agent')
+@Index('IDX_AGENT_ID_DELETED_AT', ['id', 'deletedAt'])
+export class AgentEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ nullable: false })
+  name: string;
+
+  @Column({ nullable: true })
+  description: string;
+
+  @Column({ nullable: false, type: 'text' })
+  prompt: string;
+
+  @Column({ nullable: false, type: 'varchar' })
+  modelId: ModelId;
+
+  @Column({ nullable: true, type: 'jsonb' })
+  responseFormat: object;
+
+  @Column({ nullable: false, type: 'uuid' })
+  workspaceId: string;
+
+  @ManyToOne(() => Workspace, (workspace) => workspace.agents, {
+    onDelete: 'CASCADE',
+  })
+  @JoinColumn({ name: 'workspaceId' })
+  workspace: Relation<Workspace>;
+
+  @CreateDateColumn({ type: 'timestamptz' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ type: 'timestamptz' })
+  updatedAt: Date;
+
+  @DeleteDateColumn({ type: 'timestamptz' })
+  deletedAt?: Date;
+}