pushDelta method

@override Future<void> pushDelta({ required String collection, required String recordId, required Map<String, dynamic> delta, required int baseVersion, required DateTime timestamp, })

Push delta (partial update) to backend.

Only sends changed fields instead of the entire document, reducing bandwidth by up to 98%.

Parameters:

• collection: Collection name
• recordId: Document ID
• delta: Only the fields that changed
• baseVersion: Version before this update
• timestamp: When the update occurred

If the backend doesn't support delta sync, this should fall back to a regular push() with the full document.

Implementation

@override
Future<void> pushDelta({
  required String collection,
  required String recordId,
  required Map<String, dynamic> delta,
  required int baseVersion,
  required DateTime timestamp,
}) async {
  final coll = db.collection(collection);
  final updateFields = <String, dynamic>{};
  for (final entry in delta.entries) {
    updateFields['data.${entry.key}'] = entry.value;
  }
  updateFields['updated_at'] = timestamp;
  await coll.updateOne(
    where.eq('record_id', recordId),
    modify.set('updated_at', timestamp).inc('version', 1),
  );
}