fix: maintain connections pool (#8670)

packages/core/medusa-test-utils/src/database.ts

@@ -30,6 +30,9 @@ export function getMikroOrmConfig({
     entities: Object.values(mikroOrmEntities),
     schema: schema ?? process.env.MEDUSA_DB_SCHEMA,
     debug: false,
+    pool: {
+      min: 2,
+    },
     migrations: {
       pathTs: pathToMigrations,
       silent: true,

packages/core/utils/src/dal/mikro-orm/mikro-orm-create-connection.ts

@@ -93,6 +93,9 @@ export async function mikroOrmCreateConnection(
     schemaGenerator: {
       disableForeignKeys: false,
     },
-    pool: database.pool as any,
+    pool: {
+      min: 2,
+      ...database.pool,
+    },
   })
 }

packages/core/utils/src/modules-sdk/create-pg-connection.ts

@@ -27,7 +27,7 @@ export function createPgConnection(options: Options) {
     pool: {
       // https://knexjs.org/guide/#pool
       ...(pool ?? {}),
-      min: (pool?.min as number) ?? 0,
+      min: (pool?.min as number) ?? 2,
     },
   })
 }