fix: change column type to string for relation_type (#272) #none

scripts/migrate/migrate_chroma_db.py

@@ -83,7 +83,7 @@ def _init_resource(private: bool = True, id: int = 1):
             "id": Column(Integer, primary_key=True, autoincrement=True),
             "source_id": Column(String),
             "target_id": Column(String),
-            "relation_type": Column(Integer),
+            "relation_type": Column(String),
             "user": Column(Integer, default=1),
         },
     )