Add automatic cluster pool allocation.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/clusters/entities/cluster-allocation-log.entity.ts

@@ -0,0 +1,64 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  ManyToOne,
+  JoinColumn,
+  CreateDateColumn,
+} from 'typeorm';
+import { Cluster } from './cluster.entity';
+import { ClusterPool, PoolStrategy } from './cluster-pool.entity';
+import { Application } from '../../applications/entities/application.entity';
+
+export type ClusterAllocationStatus = 'success' | 'failed';
+
+@Entity('cluster_allocation_logs')
+export class ClusterAllocationLog {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ nullable: true })
+  applicationId?: string | null;
+
+  @ManyToOne(() => Application, { nullable: true, onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'applicationId' })
+  application: Application;
+
+  @Column()
+  userId: string;
+
+  @Column({ nullable: true })
+  poolId?: string | null;
+
+  @ManyToOne(() => ClusterPool, { nullable: true, onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'poolId' })
+  pool: ClusterPool;
+
+  @Column({ nullable: true })
+  selectedClusterId?: string | null;
+
+  @ManyToOne(() => Cluster, { nullable: true, onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'selectedClusterId' })
+  selectedCluster: Cluster;
+
+  @Column({ default: 'weighted-resource' })
+  strategy: PoolStrategy;
+
+  @Column({ type: 'jsonb', nullable: true })
+  estimatedRequest: Record<string, any>;
+
+  @Column({ type: 'jsonb', nullable: true })
+  candidateScores: Record<string, any>[];
+
+  @Column({ type: 'jsonb', nullable: true })
+  rejectionReasons: Record<string, any>[];
+
+  @Column({ default: 'success' })
+  status: ClusterAllocationStatus;
+
+  @Column({ nullable: true })
+  message: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}