feat(medusa, inventory): Inventory Management module (#2956)

* feat: inventory module

packages/inventory/src/models/index.ts

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+export * from "./reservation-item"
+export * from "./inventory-item"
+export * from "./inventory-level"

packages/inventory/src/models/inventory-item.ts

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+import { Index, BeforeInsert, Column, Entity } from "typeorm"
+import { SoftDeletableEntity, generateEntityId } from "@medusajs/medusa"
+
+@Entity()
+export class InventoryItem extends SoftDeletableEntity {
+  @Index({ unique: true })
+  @Column({ type: "text", nullable: true })
+  sku: string | null
+
+  @Column({ type: "text", nullable: true })
+  origin_country: string | null
+
+  @Column({ type: "text", nullable: true })
+  hs_code: string | null
+
+  @Column({ type: "text", nullable: true })
+  mid_code: string | null
+
+  @Column({ type: "text", nullable: true })
+  material: string | null
+
+  @Column({ type: "int", nullable: true })
+  weight: number | null
+
+  @Column({ type: "int", nullable: true })
+  length: number | null
+
+  @Column({ type: "int", nullable: true })
+  height: number | null
+
+  @Column({ type: "int", nullable: true })
+  width: number | null
+
+  @Column({ default: true })
+  requires_shipping: boolean
+
+  @Column({ type: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null
+
+  @BeforeInsert()
+  private beforeInsert(): void {
+    this.id = generateEntityId(this.id, "iitem")
+  }
+}

packages/inventory/src/models/inventory-level.ts

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+import { Index, Unique, BeforeInsert, Column, Entity } from "typeorm"
+import { SoftDeletableEntity, generateEntityId } from "@medusajs/medusa"
+
+@Entity()
+@Index(["inventory_item_id", "location_id"], { unique: true })
+export class InventoryLevel extends SoftDeletableEntity {
+  @Index()
+  @Column({ type: "text" })
+  inventory_item_id: string
+
+  @Index()
+  @Column({ type: "text" })
+  location_id: string
+
+  @Column({ default: 0 })
+  stocked_quantity: number
+
+  @Column({ default: 0 })
+  reserved_quantity: number
+
+  @Column({ default: 0 })
+  incoming_quantity: number
+
+  @Column({ type: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null
+
+  @BeforeInsert()
+  private beforeInsert(): void {
+    this.id = generateEntityId(this.id, "ilev")
+  }
+}

packages/inventory/src/models/reservation-item.ts

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+import { Index, Unique, BeforeInsert, Column, Entity } from "typeorm"
+import { SoftDeletableEntity, generateEntityId } from "@medusajs/medusa"
+
+@Entity()
+export class ReservationItem extends SoftDeletableEntity {
+  @Index()
+  @Column({ type: "text", nullable: true })
+  line_item_id: string | null
+
+  @Index()
+  @Column({ type: "text" })
+  inventory_item_id: string
+
+  @Index()
+  @Column({ type: "text" })
+  location_id: string
+
+  @Column()
+  quantity: number
+
+  @Column({ type: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null
+
+  @BeforeInsert()
+  private beforeInsert(): void {
+    this.id = generateEntityId(this.id, "resitem")
+  }
+}