feat(storage): add storage package base

backend/packages/storage/store/persistence/drivers/sqlite.py

@@ -0,0 +1,69 @@
+
+from __future__ import annotations
+
+import json
+
+from sqlalchemy import URL, event
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+
+from store.persistence import MappedBase
+from store.persistence.shared import close_in_order
+from store.persistence.types import AppPersistence
+
+
+async def build_sqlite_persistence(db_url: URL, *, echo: bool = False) -> AppPersistence:
+    from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+    import store.repositories.models  # noqa: F401
+
+    engine = create_async_engine(
+        db_url,
+        echo=echo,
+        future=True,
+        json_serializer=lambda obj: json.dumps(obj, ensure_ascii=False),
+    )
+
+    @event.listens_for(engine.sync_engine, "connect")
+    def _enable_sqlite_pragmas(dbapi_conn, _record):  # noqa: ANN001
+        cursor = dbapi_conn.cursor()
+        try:
+            cursor.execute("PRAGMA journal_mode=WAL;")
+            cursor.execute("PRAGMA synchronous=NORMAL;")
+            cursor.execute("PRAGMA foreign_keys=ON;")
+        finally:
+            cursor.close()
+
+    session_factory = async_sessionmaker(
+        bind=engine,
+        class_=AsyncSession,
+        expire_on_commit=False,
+        autoflush=False,
+    )
+
+    saver_cm = AsyncSqliteSaver.from_conn_string(db_url.database)
+    checkpointer = await saver_cm.__aenter__()
+
+    async def setup() -> None:
+        # 1. LangGraph checkpoint tables
+        await checkpointer.setup()
+
+        # 2. ORM business tables
+        async with engine.begin() as conn:
+            await conn.run_sync(MappedBase.metadata.create_all)
+
+    async def _close_saver() -> None:
+        await saver_cm.__aexit__(None, None, None)
+
+    async def aclose() -> None:
+        await close_in_order(
+            engine.dispose,
+            _close_saver,
+        )
+
+    return AppPersistence(
+        checkpointer=checkpointer,
+        engine=engine,
+        session_factory=session_factory,
+        setup=setup,
+        aclose=aclose,
+    )