always insert user into table to maintain db constraints

nomen/notifications.py

@@ -137,6 +137,9 @@ class Notifications(Cog):
 
         await handle_triggers(ctx, message)
 
+    async def cog_before_invoke(ctx):
+        await ctx.bot.db.execute("INSERT OR IGNORE INTO users (userid) VALUE(?)", (ctx.author.id,))
+
     @group(
         aliases=["kw", "notification", "notifications", "notif", "noti"],
         invoke_without_command=True,