install npm dependencies, add last_edit message field

backend/src/database.py

@@ -85,7 +85,7 @@ class Message(Base):
     # Timestamp when this message was sent
     time: Mapped[int]
     # Timestamp of this message's last edit
-    #last_edit: Mapped[int]
+    last_edit: Mapped[int]
 
     # Predefined set of message types:
     # message, log, memory, file, note