chore(): Reorganize modules (#7210)

**What**
Move all modules to the modules directory

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

@@ -0,0 +1,114 @@
+import {
+  BeforeCreate,
+  Entity,
+  Filter,
+  ManyToOne,
+  OnInit,
+  OnLoad,
+  PrimaryKey,
+  Property,
+} from "@mikro-orm/core"
+import { DALUtils, isDefined } from "@medusajs/utils"
+
+import { InventoryItem } from "./inventory-item"
+import { createPsqlIndexStatementHelper } from "@medusajs/utils"
+import { generateEntityId } from "@medusajs/utils"
+
+const InventoryLevelDeletedAtIndex = createPsqlIndexStatementHelper({
+  tableName: "inventory_level",
+  columns: "deleted_at",
+  where: "deleted_at IS NOT NULL",
+})
+
+const InventoryLevelInventoryItemIdIndex = createPsqlIndexStatementHelper({
+  tableName: "inventory_level",
+  columns: "inventory_item_id",
+})
+
+const InventoryLevelLocationIdIndex = createPsqlIndexStatementHelper({
+  tableName: "inventory_level",
+  columns: "location_id",
+})
+
+const InventoryLevelLocationIdInventoryItemIdIndex =
+  createPsqlIndexStatementHelper({
+    tableName: "inventory_level",
+    columns: "location_id",
+  })
+
+@Entity()
+@InventoryLevelLocationIdInventoryItemIdIndex.MikroORMIndex()
+@Filter(DALUtils.mikroOrmSoftDeletableFilterOptions)
+export class InventoryLevel {
+  @PrimaryKey({ columnType: "text" })
+  id: string
+
+  @Property({
+    onCreate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  created_at: Date
+
+  @Property({
+    onCreate: () => new Date(),
+    onUpdate: () => new Date(),
+    columnType: "timestamptz",
+    defaultRaw: "now()",
+  })
+  updated_at: Date
+
+  @InventoryLevelDeletedAtIndex.MikroORMIndex()
+  @Property({ columnType: "timestamptz", nullable: true })
+  deleted_at: Date | null = null
+
+  @ManyToOne(() => InventoryItem, {
+    fieldName: "inventory_item_id",
+    type: "text",
+    mapToPk: true,
+    onDelete: "cascade",
+  })
+  @InventoryLevelInventoryItemIdIndex.MikroORMIndex()
+  inventory_item_id: string
+
+  @InventoryLevelLocationIdIndex.MikroORMIndex()
+  @Property({ type: "text" })
+  location_id: string
+
+  @Property({ type: "int" })
+  stocked_quantity: number = 0
+
+  @Property({ type: "int" })
+  reserved_quantity: number = 0
+
+  @Property({ type: "int" })
+  incoming_quantity: number = 0
+
+  @Property({ columnType: "jsonb", nullable: true })
+  metadata: Record<string, unknown> | null
+
+  @ManyToOne(() => InventoryItem, {
+    persist: false,
+  })
+  inventory_item: InventoryItem
+
+  available_quantity: number | null = null
+
+  @BeforeCreate()
+  private beforeCreate(): void {
+    this.id = generateEntityId(this.id, "ilev")
+    this.inventory_item_id ??= this.inventory_item?.id
+  }
+
+  @OnInit()
+  private onInit(): void {
+    this.id = generateEntityId(this.id, "ilev")
+  }
+
+  @OnLoad()
+  private onLoad(): void {
+    if (isDefined(this.stocked_quantity) && isDefined(this.reserved_quantity)) {
+      this.available_quantity = this.stocked_quantity - this.reserved_quantity
+    }
+  }
+}