sequenceDiagram
    actor ExternalAI as External AI System
    participant ACS as AiCallbackService
    participant PPR as PlacePlatformReferenceRepository
    participant PR as PlaceRepository
    participant CR as ContentRepository
    participant DB as Database

    ExternalAI->>ACS: POST /ai-callback (SnsInfoCallback, PlaceDetailCallback)
    
    activate ACS
    
    alt SUCCESS Case
        ACS->>PPR: findByPlacePlatformAndPlacePlatformId(NAVER, naverId)
        alt PlacePlatformReference exists
            PPR-->>ACS: Existing Reference
            ACS->>PR: findById(placeId)
            PR-->>ACS: Existing Place
        else PlacePlatformReference not found
            ACS->>PR: findByNameAndCoordinates()
            alt Place found by name/coords
                PR-->>ACS: Existing Place
            else Place not found
                ACS->>PR: save(createNewPlace)
                PR->>DB: INSERT Place
                DB-->>PR: Place with ID
                PR-->>ACS: New Place
            end
        end
        
        ACS->>ACS: updatePlaceFromPlaceDetail(place, placeDetail)
        ACS->>PR: save(updated place)
        PR->>DB: UPDATE Place with new fields
        
        ACS->>PPR: save(PlacePlatformReference)
        PPR->>DB: INSERT/UPDATE PlacePlatformReference
        
        ACS->>ACS: updateContentWithSnsInfo(content, snsInfo)
        ACS->>CR: save(updated content)
        CR->>DB: UPDATE Content with SNS metadata
        
        ACS->>ACS: logStatistics(extractionStatistics)
    
    else FAILED Case
        ACS->>ACS: processFailedCallback(errorMessage)
    end
    
    ACS-->>ExternalAI: Callback Response
    deactivate ACS