graph2: Added change type and query.

graph2/queries/changes.go

@@ -0,0 +1,14 @@
+package queries
+
+import (
+	"context"
+
+	"git.aiterp.net/rpdata/api/models"
+	"git.aiterp.net/rpdata/api/models/changes"
+)
+
+/// Queries
+
+func (r *resolver) Changes(ctx context.Context, filter *changes.Filter) ([]models.Change, error) {
+	return changes.List(filter)
+}