simplified some, walked back some decisions

llama_stack/providers/inline/vector_io/chroma/config.py

@@ -24,6 +24,7 @@ class ChromaVectorIOConfig(BaseModel):
         return {
             "db_path": db_path,
             "kvstore": KVStoreReference(
+                backend="kv_default",
                 namespace="vector_io::chroma",
             ).model_dump(exclude_none=True),
         }

llama_stack/providers/inline/vector_io/faiss/config.py

@@ -20,6 +20,7 @@ class FaissVectorIOConfig(BaseModel):
     def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> dict[str, Any]:
         return {
             "kvstore": KVStoreReference(
+                backend="kv_default",
                 namespace="vector_io::faiss",
             ).model_dump(exclude_none=True)
         }

llama_stack/providers/inline/vector_io/milvus/config.py

@@ -23,6 +23,7 @@ class MilvusVectorIOConfig(BaseModel):
         return {
             "db_path": "${env.MILVUS_DB_PATH:=" + __distro_dir__ + "}/" + "milvus.db",
             "kvstore": KVStoreReference(
+                backend="kv_default",
                 namespace="vector_io::milvus",
             ).model_dump(exclude_none=True),
         }

llama_stack/providers/inline/vector_io/qdrant/config.py

@@ -23,6 +23,7 @@ class QdrantVectorIOConfig(BaseModel):
         return {
             "path": "${env.QDRANT_PATH:=~/.llama/" + __distro_dir__ + "}/" + "qdrant.db",
             "kvstore": KVStoreReference(
+                backend="kv_default",
                 namespace="vector_io::qdrant",
             ).model_dump(exclude_none=True),
         }

llama_stack/providers/inline/vector_io/sqlite_vec/config.py

@@ -20,6 +20,7 @@ class SQLiteVectorIOConfig(BaseModel):
         return {
             "db_path": "${env.SQLITE_STORE_DIR:=" + __distro_dir__ + "}/" + "sqlite_vec.db",
             "kvstore": KVStoreReference(
+                backend="kv_default",
                 namespace="vector_io::sqlite_vec",
             ).model_dump(exclude_none=True),
         }