Endpoint to delete documents ingested (#1163)

A file that is ingested will be transformed into several documents (that
are organized into nodes).
This endpoint is deleting documents (bits of a file). These bits can be
retrieved thanks to the endpoint to list all the documents.

private_gpt/components/node_store/node_store_component.py

@@ -1,3 +1,5 @@
+import logging
+
 from injector import inject, singleton
 from llama_index.storage.docstore import BaseDocumentStore, SimpleDocumentStore
 from llama_index.storage.index_store import SimpleIndexStore
@@ -5,6 +7,8 @@ from llama_index.storage.index_store.types import BaseIndexStore
 
 from private_gpt.paths import local_data_path
 
+logger = logging.getLogger(__name__)
+
 
 @singleton
 class NodeStoreComponent:
@@ -18,6 +22,7 @@ class NodeStoreComponent:
                 persist_dir=str(local_data_path)
             )
         except FileNotFoundError:
+            logger.debug("Local index store not found, creating a new one")
             self.index_store = SimpleIndexStore()
 
         try:
@@ -25,4 +30,5 @@ class NodeStoreComponent:
                 persist_dir=str(local_data_path)
             )
         except FileNotFoundError:
+            logger.debug("Local document store not found, creating a new one")
             self.doc_store = SimpleDocumentStore()