fix(agent-assignment): 소속 시각 UTC 변환을 적용한다

src/main/kotlin/kr/co/vividnext/sodalive/admin/partner/agent/assignment/AdminAgentCreatorService.kt

@@ -1,6 +1,7 @@
 package kr.co.vividnext.sodalive.admin.partner.agent.assignment
 
 import kr.co.vividnext.sodalive.common.SodaException
+import kr.co.vividnext.sodalive.extensions.convertToUtc
 import kr.co.vividnext.sodalive.member.MemberRepository
 import kr.co.vividnext.sodalive.member.MemberRole
 import kr.co.vividnext.sodalive.partner.agent.assignment.AgentCreatorRelation
@@ -37,14 +38,15 @@ class AdminAgentCreatorService(
         }
 
         val existingRelations = relationRepository.findAllByCreatorIdOrderByAssignedAtAsc(request.creatorId)
-        if (hasAssignmentOverlap(existingRelations, request.assignedAt)) {
+        val assignedAt = request.assignedAt.convertToUtc()
+        if (hasAssignmentOverlap(existingRelations, assignedAt)) {
             throw SodaException(messageKey = "partner.agent.assignment.assignment_overlap")
         }
 
         val relation = AgentCreatorRelation()
         relation.agent = agent
         relation.creator = creator
-        relation.assignedAt = request.assignedAt
+        relation.assignedAt = assignedAt
         try {
             relationRepository.saveAndFlush(relation)
         } catch (e: DataIntegrityViolationException) {
@@ -67,11 +69,12 @@ class AdminAgentCreatorService(
 
         val assignedAt = relation.assignedAt
             ?: throw SodaException(messageKey = "partner.agent.assignment.not_found")
-        if (!request.unassignedAt.isAfter(assignedAt)) {
+        val unassignedAt = request.unassignedAt.convertToUtc()
+        if (!unassignedAt.isAfter(assignedAt)) {
             throw SodaException(messageKey = "partner.agent.assignment.invalid_unassigned_at")
         }
 
-        relation.unassignedAt = request.unassignedAt
+        relation.unassignedAt = unassignedAt
         relationRepository.save(relation)
     }