putAll method
Store multiple values at once (batch operation).
More efficient than multiple individual puts.
Example:
await db.putAll({
'user:1': {'name': 'Alice'},
'user:2': {'name': 'Bob'},
'user:3': {'name': 'Charlie'},
});
Implementation
Future<void> putAll(Map<String, dynamic> entries) async {
await _db.putBatch(entries);
_keys.addAll(entries.keys);
await _saveKeys();
}