fix(medusa): Make event enqueuer reconnect the database when it lost the connection (#4855)

* Try to periodically reconnect database from enqueuer

* Create great-months-train.md

---------

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

.changeset/great-months-train.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa": patch
+---
+
+fix(medusa): Make event enqueuer reconnect the database when it lost the connection

packages/medusa/src/services/event-bus.ts

@@ -1,5 +1,5 @@
 import { EventBusTypes } from "@medusajs/types"
-import { EventBusUtils } from "@medusajs/utils"
+import { DatabaseErrorCode, EventBusUtils } from "@medusajs/utils"
 import { EntityManager } from "typeorm"
 import { TransactionBaseService } from "../interfaces"
 import { StagedJob } from "../models"
@@ -190,6 +190,7 @@ export default class EventBusService
     }
 
     while (this.shouldEnqueuerRun) {
+      try {
         const jobs = await this.stagedJobService_.list(listConfig)
 
         if (!jobs.length) {
@@ -210,6 +211,14 @@ export default class EventBusService
         })
 
         await sleep(3000)
+      } catch (err) {
+        if (DatabaseErrorCode.connectionFailure === err.code) {
+          await sleep(3000)
+          continue
+        }
+
+        throw err
+      }
     }
   }
 }