feat: media duplicate purge, part 1 of 3: persisted purge settings and the purge API

internal/infrastructure/useCases/MergeMedia.go

@@ -10,8 +10,9 @@ import (
 )
 
 type MergeMediaResult struct {
-	ArticlesUpdated int
-	Merged          int
+	ArticlesUpdated   int
+	Merged            int
+	UpdatedArticleIDs []uint32
 }
 
 type MergeMediaUseCase struct {
@@ -57,7 +58,15 @@ func (u *MergeMediaUseCase) Merge(keepId uint32, mergeIds []uint32) (MergeMediaR
 		}
 	}
 
-	return MergeMediaResult{ArticlesUpdated: len(rewrites), Merged: len(copies)}, nil
+	return MergeMediaResult{ArticlesUpdated: len(rewrites), Merged: len(copies), UpdatedArticleIDs: rewrittenIds(rewrites)}, nil
+}
+
+func rewrittenIds(rewrites []bodyRewrite) []uint32 {
+	ids := make([]uint32, 0, len(rewrites))
+	for _, plan := range rewrites {
+		ids = append(ids, plan.articleId)
+	}
+	return ids
 }
 
 func validateMergeRequest(keepId uint32, mergeIds []uint32) error {