将persist和后端分离，方便替换为其他数据库

sync_state_machine/pipeline/factory.py

@@ -21,7 +21,7 @@ from typing import Any, Dict, List, Optional
 
 from ..common.binding import BindingManager
 from ..common.collection import DataCollection
-from ..common.persistence import PersistenceBackend
+from ..common.persistence import PersistenceBackend, create_persistence_backend
 from ..common.registry import DomainRegistry
 from ..datasource import ensure_builtin_datasource_types_registered
 from ..datasource.type_registry import get_datasource_factory
@@ -292,9 +292,6 @@ async def create_pipeline_from_config(
     all_types = list(config.node_types)
     strategy_map = _resolve_strategy_map(config, all_types)
 
-    if config.persist.backend != "sqlite":
-        raise NotImplementedError(f"Persistence backend not supported yet: {config.persist.backend}")
-
     db_path = Path(config.persist.db_path)
     if config.persist.wipe_on_start and db_path.exists():
         db_path.unlink()
@@ -303,7 +300,7 @@ async def create_pipeline_from_config(
     local_ds = None
     remote_ds = None
     try:
-        persistence = PersistenceBackend(str(config.persist.db_path), backend=config.persist.backend)
+        persistence = create_persistence_backend(config.persist)
         await persistence.initialize()
 
         local_ds = await _create_datasource(