improve handling of remote status updated_at to fix previous cases

internal/federation/dereferencing/status.go

@@ -1157,6 +1157,25 @@ func (d *Dereferencer) handleStatusEdit(
 		edited = true
 	}
 
+	switch {
+	// We prefer to use provided 'upated_at', but ensure
+	// it fits chronologically with creation / last update.
+
+	// updated_at has jumped backward, safety check it.
+	case existing.UpdatedAt.Before(status.UpdatedAt):
+		cols = append(cols, "updated_at")
+
+		if existing.CreatedAt.After(status.UpdatedAt) {
+			// It's jumped behind creation date,
+			// at least match it to creation time.
+			status.UpdatedAt = existing.CreatedAt
+		}
+
+	// updated_at has jumped forward, this is fine.
+	case existing.UpdatedAt.After(status.UpdatedAt):
+		cols = append(cols, "updated_at")
+	}
+
 	if pollChanged {
 		// Attached poll was changed.
 		cols = append(cols, "poll_id")
@@ -1210,15 +1229,6 @@ func (d *Dereferencer) handleStatusEdit(
 	}
 
 	if edited {
-		// We prefer to use provided 'upated_at', but ensure
-		// it fits chronologically with creation / last update.
-		if !status.UpdatedAt.After(status.CreatedAt) ||
-			!status.UpdatedAt.After(existing.UpdatedAt) {
-
-			// Else fallback to now as update time.
-			status.UpdatedAt = status.FetchedAt
-		}
-
 		// Status has been editted since last
 		// we saw it, take snapshot of existing.
 		var edit gtsmodel.StatusEdit
@@ -1265,8 +1275,8 @@ func (d *Dereferencer) handleStatusEdit(
 		status.EditIDs = append(status.EditIDs, edit.ID)
 		status.Edits = append(status.Edits, &edit)
 
-		// Add updated_at and edits to list of cols.
+		// Add edit to list of cols.
-		cols = append(cols, "updated_at", "edits")
+		cols = append(cols, "edits")
 	}
 
 	return cols, nil