feat(merge): 🎉 Add support for constraints and indexes in merge results

* Enhance MergeResult to track added constraints and indexes.
* Update merge logic to increment counters for added constraints and indexes.
* Modify GetMergeSummary to include constraints and indexes in the output.
* Add comprehensive tests for merging constraints and indexes.

pkg/merge/merge.go

@@ -12,14 +12,16 @@ import (
 
 // MergeResult represents the result of a merge operation
 type MergeResult struct {
-	SchemasAdded   int
-	TablesAdded    int
-	ColumnsAdded   int
-	RelationsAdded int
-	DomainsAdded   int
-	EnumsAdded     int
-	ViewsAdded     int
-	SequencesAdded int
+	SchemasAdded     int
+	TablesAdded      int
+	ColumnsAdded     int
+	ConstraintsAdded int
+	IndexesAdded     int
+	RelationsAdded   int
+	DomainsAdded     int
+	EnumsAdded       int
+	ViewsAdded       int
+	SequencesAdded   int
 }
 
 // MergeOptions contains options for merge operations
@@ -171,6 +173,7 @@ func (r *MergeResult) mergeConstraints(table *models.Table, srcTable *models.Tab
 			// Constraint doesn't exist, add it
 			newConst := cloneConstraint(srcConst)
 			table.Constraints[constName] = newConst
+			r.ConstraintsAdded++
 		}
 	}
 }
@@ -193,6 +196,7 @@ func (r *MergeResult) mergeIndexes(table *models.Table, srcTable *models.Table)
 			// Index doesn't exist, add it
 			newIdx := cloneIndex(srcIdx)
 			table.Indexes[idxName] = newIdx
+			r.IndexesAdded++
 		}
 	}
 }
@@ -598,6 +602,8 @@ func GetMergeSummary(result *MergeResult) string {
 		fmt.Sprintf("Schemas added:     %d", result.SchemasAdded),
 		fmt.Sprintf("Tables added:      %d", result.TablesAdded),
 		fmt.Sprintf("Columns added:     %d", result.ColumnsAdded),
+		fmt.Sprintf("Constraints added: %d", result.ConstraintsAdded),
+		fmt.Sprintf("Indexes added:     %d", result.IndexesAdded),
 		fmt.Sprintf("Views added:       %d", result.ViewsAdded),
 		fmt.Sprintf("Sequences added:   %d", result.SequencesAdded),
 		fmt.Sprintf("Enums added:       %d", result.EnumsAdded),
@@ -606,6 +612,7 @@ func GetMergeSummary(result *MergeResult) string {
 	}
 
 	totalAdded := result.SchemasAdded + result.TablesAdded + result.ColumnsAdded +
+		result.ConstraintsAdded + result.IndexesAdded +
 		result.ViewsAdded + result.SequencesAdded + result.EnumsAdded +
 		result.RelationsAdded + result.DomainsAdded