fix: sqlalchemy import always required (#584)

Author: mhordynski

packages/ragbits-chat/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- fix: dont import all persistence strategies in base file (#584)
+
 ## 0.19.0 (2025-05-27)
 
 ### Changed

packages/ragbits-chat/pyproject.toml

@@ -40,6 +40,10 @@ dependencies = ["fastapi>=0.115.0,<1.0.0", "uvicorn>=0.31.0,<1.0.0", "ragbits-co
 "Source" = "https://github.com/deepsense-ai/ragbits"
 
 [project.optional-dependencies]
+sql = [
+    "sqlalchemy>=2.0.39,<3.0.0",
+]
+
 [tool.uv]
 dev-dependencies = [
     "pre-commit~=3.8.0",

packages/ragbits-chat/src/ragbits/chat/persistence/__init__.py

@@ -1,5 +1,3 @@
 from ragbits.chat.persistence.base import HistoryPersistenceStrategy
-from ragbits.chat.persistence.file import FileHistoryPersistence
-from ragbits.chat.persistence.sql import SQLHistoryPersistence
 
-__all__ = ["FileHistoryPersistence", "HistoryPersistenceStrategy", "SQLHistoryPersistence"]
+__all__ = ["HistoryPersistenceStrategy"]