feat: event aggregator (#6218)

What:
- Event Aggregator Util
- Preparation for normalizing event in a new format (backward compatible with the current format)
- GQL Schema to joiner config and some Entities configured
- Link modules emmiting events

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

@@ -6,9 +6,11 @@ import {
   DeleteDateColumn,
   Entity,
   Index,
+  OneToMany,
   PrimaryColumn,
   UpdateDateColumn,
 } from "typeorm"
+import { InventoryLevel } from "./inventory-level"
 
 @Entity()
 export class InventoryItem {
@@ -67,6 +69,12 @@ export class InventoryItem {
   @Column({ type: "jsonb", nullable: true })
   metadata: Record<string, unknown> | null
 
+  @OneToMany(
+    () => InventoryLevel,
+    (inventoryLevel) => inventoryLevel.inventory_item
+  )
+  inventory_levels!: InventoryLevel[]
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "iitem")

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

@@ -6,9 +6,12 @@ import {
   DeleteDateColumn,
   Entity,
   Index,
+  JoinColumn,
+  ManyToOne,
   PrimaryColumn,
   UpdateDateColumn,
 } from "typeorm"
+import { InventoryItem } from "./inventory-item"
 
 @Entity()
 @Index(["inventory_item_id", "location_id"], { unique: true })
@@ -45,6 +48,10 @@ export class InventoryLevel {
   @Column({ type: "jsonb", nullable: true })
   metadata: Record<string, unknown> | null
 
+  @ManyToOne(() => InventoryItem)
+  @JoinColumn({ name: "inventory_item_id" })
+  inventory_item: InventoryItem
+
   @BeforeInsert()
   private beforeInsert(): void {
     this.id = generateEntityId(this.id, "ilev")