Proper procedure for wp_insert_post?

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  1. WordPress just adds a new entry, the title is not unique, but there is a field guid which is. Permalinks do get an incremental number.
  2. Yes, you should remove it from your theme, you’d better write your own plugin for this kind of stuff.
  3. I don’t totally understand what you mean, is there no menu entry in the admin? That’s because it’s not a plugin. Does it not show up in the theme editor? Then the file probably doesn’t have an appropiate header, is not in the correct place or not correctly named.