Add DuckDB (#222)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: William Easton <strawgate@users.noreply.github.com>

Author: strawgate

key-value/key-value-aio/pyproject.toml

@@ -49,6 +49,7 @@ rocksdb = [
     "rocksdict>=0.3.24 ; python_version >= '3.12'", # RocksDB 0.3.24 is the first version to support Python 3.13
     "rocksdict>=0.3.2 ; python_version < '3.12'"
 ]
+duckdb = ["duckdb>=1.1.1", "pytz>=2025.2"]
 wrappers-encryption = ["cryptography>=45.0.0"]
 
 [tool.pytest.ini_options]
@@ -68,7 +69,7 @@ env_files = [".env"]
 
 [dependency-groups]
 dev = [
-    "py-key-value-aio[memory,disk,filetree,redis,elasticsearch,memcached,mongodb,vault,dynamodb,rocksdb]",
+    "py-key-value-aio[memory,disk,filetree,redis,elasticsearch,memcached,mongodb,vault,dynamodb,rocksdb,duckdb]",
     "py-key-value-aio[valkey]; platform_system != 'Windows'",
     "py-key-value-aio[keyring]",
     "py-key-value-aio[pydantic]",

key-value/key-value-aio/src/key_value/aio/stores/duckdb/__init__.py

@@ -0,0 +1,3 @@
+from key_value.aio.stores.duckdb.store import DuckDBStore
+
+__all__ = ["DuckDBStore"]