designed the entity and database schema for the assets module

backend/src/assets/asset-document.entity.ts

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+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  ManyToOne,
+  CreateDateColumn,
+} from 'typeorm';
+import { User } from '../users/user.entity';
+
+@Entity('asset_documents')
+export class AssetDocument {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  assetId: string;
+
+  @Column()
+  name: string;
+
+  @Column()
+  url: string;
+
+  @Column({ default: 'application/octet-stream' })
+  type: string;
+
+  @Column({ nullable: true })
+  size: number | null;
+
+  @ManyToOne(() => User, { eager: true })
+  uploadedBy: User;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}

backend/src/assets/asset-history.entity.ts

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+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  ManyToOne,
+  JoinColumn,
+  CreateDateColumn,
+} from 'typeorm';
+import { Asset } from './asset.entity';
+import { User } from '../users/user.entity';
+import { AssetHistoryAction } from './enums';
+
+@Entity('asset_history')
+export class AssetHistory {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @ManyToOne(() => Asset, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'assetId' })
+  asset: Asset;
+
+  @Column()
+  assetId: string;
+
+  @Column({ type: 'enum', enum: AssetHistoryAction })
+  action: AssetHistoryAction;
+
+  @Column()
+  description: string;
+
+  @Column({ type: 'jsonb', nullable: true })
+  previousValue: Record<string, unknown> | null;
+
+  @Column({ type: 'jsonb', nullable: true })
+  newValue: Record<string, unknown> | null;
+
+  @ManyToOne(() => User, { eager: true, nullable: true })
+  @JoinColumn({ name: 'performedById' })
+  performedBy: User | null;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}

backend/src/assets/asset-note.entity.ts

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+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  ManyToOne,
+  JoinColumn,
+  CreateDateColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+import { User } from '../users/user.entity';
+
+@Entity('asset_notes')
+export class AssetNote {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  assetId: string;
+
+  @Column('text')
+  content: string;
+
+  @ManyToOne(() => User, { eager: true })
+  createdBy: User;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}

backend/src/assets/asset.entity.ts

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+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  ManyToOne,
+  JoinColumn,
+  CreateDateColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+import { User } from '../users/user.entity';
+import { Department } from '../departments/department.entity';
+import { Category } from '../categories/category.entity';
+import { AssetStatus, AssetCondition, StellarStatus } from './enums';
+
+@Entity('assets')
+export class Asset {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ unique: true })
+  assetId: string;
+
+  @Column()
+  name: string;
+
+  @Column({ nullable: true, type: 'text' })
+  description: string | null;
+
+  @ManyToOne(() => Category, { eager: true, nullable: false })
+  @JoinColumn({ name: 'categoryId' })
+  category: Category;
+
+  @Column({ nullable: true })
+  serialNumber: string | null;
+
+  @Column({ nullable: true, type: 'date' })
+  purchaseDate: Date | null;
+
+  @Column({ nullable: true, type: 'decimal', precision: 15, scale: 2 })
+  purchasePrice: number | null;
+
+  @Column({ nullable: true, type: 'decimal', precision: 15, scale: 2 })
+  currentValue: number | null;
+
+  @Column({ nullable: true, type: 'date' })
+  warrantyExpiration: Date | null;
+
+  @Column({ type: 'enum', enum: AssetStatus, default: AssetStatus.ACTIVE })
+  status: AssetStatus;
+
+  @Column({ type: 'enum', enum: AssetCondition, default: AssetCondition.NEW })
+  condition: AssetCondition;
+
+  @ManyToOne(() => Department, { eager: true, nullable: false })
+  @JoinColumn({ name: 'departmentId' })
+  department: Department;
+
+  @Column({ nullable: true })
+  location: string | null;
+
+  @ManyToOne(() => User, { eager: true, nullable: true })
+  @JoinColumn({ name: 'assignedToId' })
+  assignedTo: User | null;
+
+  @Column({ type: 'simple-array', nullable: true })
+  imageUrls: string[] | null;
+
+  @Column({ type: 'jsonb', nullable: true })
+  customFields: Record<string, unknown> | null;
+
+  @Column({ type: 'simple-array', nullable: true })
+  tags: string[] | null;
+
+  @Column({ nullable: true })
+  manufacturer: string | null;
+
+  @Column({ nullable: true })
+  model: string | null;
+
+  @Column({ nullable: true })
+  barcode: string | null;
+
+  @Column({ nullable: true })
+  qrCode: string | null;
+
+  @Column({ nullable: true, type: 'text' })
+  notes: string | null;
+
+  @Column({ nullable: true })
+  stellarAssetId: string | null;
+
+  @Column({ nullable: true })
+  stellarTxHash: string | null;
+
+  @Column({ type: 'enum', enum: StellarStatus, default: StellarStatus.NOT_REGISTERED })
+  stellarStatus: StellarStatus;
+
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'createdById' })
+  createdBy: User | null;
+
+  @ManyToOne(() => User, { nullable: true })
+  @JoinColumn({ name: 'updatedById' })
+  updatedBy: User | null;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}