feat: Implement merge person functionality with associated request and repository methods

libertas_infra/src/repositories/face_region_repository.rs

@@ -1,5 +1,9 @@
 use async_trait::async_trait;
-use libertas_core::{error::{CoreError, CoreResult}, models::FaceRegion, repositories::FaceRegionRepository};
+use libertas_core::{
+    error::{CoreError, CoreResult},
+    models::FaceRegion,
+    repositories::FaceRegionRepository,
+};
 use sqlx::PgPool;
 use uuid::Uuid;
 
@@ -125,4 +129,20 @@ impl FaceRegionRepository for PostgresFaceRegionRepository {
         .map_err(|e| CoreError::Database(e.to_string()))?;
         Ok(())
     }
-}
+
+    async fn reassign_person(&self, old_person_id: Uuid, new_person_id: Uuid) -> CoreResult<()> {
+        sqlx::query!(
+            r#"
+            UPDATE face_regions
+            SET person_id = $1
+            WHERE person_id = $2
+            "#,
+            new_person_id,
+            old_person_id
+        )
+        .execute(&self.pool)
+        .await
+        .map_err(|e| CoreError::Database(e.to_string()))?;
+        Ok(())
+    }
+}