install npm dependencies, add last_edit message field

Makefile

@@ -11,6 +11,7 @@ install: venv
 	@$(VENV_DIR)/bin/pip install -r backend/requirements.txt
 	git submodule init
 	git submodule update
+	cd frontend && npm install
 
 web: frontend/dist/index.html
 

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