add method
Add a new key-value pair to the store synchronously
Overwrites the value if the key already exists.
Prefer addAsync to avoid blocking the UI thread. Otherwise, this has slightly better performance.
Implementation
void add({
required String key,
required String value,
}) =>
_db.writeTxnSync(
() => _db.metadata.putSync(DbMetadata(name: key, data: value)),
);