diff --git a/cmd/main-migration/migrations/atlas.sum b/cmd/main-migration/migrations/atlas.sum
index 3ff7d286..77699682 100644
--- a/cmd/main-migration/migrations/atlas.sum
+++ b/cmd/main-migration/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:IfSOZ5RxGCWboRtqCJrYxCJa1HYSrlROJLXcElq1P3I=
+h1:bNByj2VsHOaJEMfbX3xRNdLNTeYIVgInihZwRFfBUpc=
 20250904105930.sql h1:MEM6blCgke9DzWQSTnLzasbPIrcHssNNrJqZpSkEo6k=
 20250904141448.sql h1:J8cmYNk4ZrG9fhfbi2Z1IWz7YkfvhFqTzrLFo58BPY0=
 20250908062237.sql h1:Pu23yEW/aKkwozHoOuROvHS/GK4ngARJGdO7FB7HZuI=
@@ -162,4 +162,4 @@ h1:IfSOZ5RxGCWboRtqCJrYxCJa1HYSrlROJLXcElq1P3I=
 20251209084929.sql h1:u4LPMvkGAH4RfGC2IlBTIm7T7paMHoBSvTQ0w5Br7d0=
 20251210145148.sql h1:rejGrnTpaygxPv06v0vxMytF4rk1OJBXaw3ttSmidgc=
 20251211101547.sql h1:+jT5yRCEsSRExzoawrqymS/I7lVfwUQQSgSzbxCxgRk=
-20251211113942.sql h1:F8go8XaJf4GFa4RuoMlo4U/NtbDtbDkVYHZOJz7GYhM=
+20251211113942.sql h1:hRwiVZnXGzgUbqOk5TZ6ZHzGs1GebIFeIKkJNb+6+f0=
diff --git a/internal/domain/main-entities/specialist/entity.go b/internal/domain/main-entities/specialist/entity.go
index 0326f614..c53e29ec 100644
--- a/internal/domain/main-entities/specialist/entity.go
+++ b/internal/domain/main-entities/specialist/entity.go
@@ -11,7 +11,7 @@ type Specialist struct {
 	ecore.SmallMain                      // adjust this according to the needs
 	Code                string           `json:"code" gorm:"unique;size:20"`
 	Name                string           `json:"name" gorm:"size:50"`
-	Installation_Code   string           `json:"installation_code" gorm:"size:20"`
+	Installation_Code   *string          `json:"installation_code" gorm:"size:20"`
 	Installation        *ei.Installation `json:"installation,omitempty" gorm:"foreignKey:Installation_Code;references:Code"`
 	SpecialistPositions []eub.Basic      `json:"specialistPositions,omitempty" gorm:"foreignKey:Specialist_Code;references:Code"`
 	Subspecialists      []essb.Basic     `json:"subspecialists,omitempty" gorm:"foreignKey:Specialist_Code;references:Code"`