Default to :session for org mode source blocks?

I use C-c C-, to insert source block. I would like to have it such that every source block has :session on it by default; how would I get that to be? Would some kind of advice be appropriate here?

Use `#+property:` in the the file or `:properties:` immediately under a heading to specify header args. Using the inherited properties, you can easily specify that every SRC block should use the same session. See here: https://org-babel.readthedocs.io/en/latest/header-args/

I use yasnippet for this purpose. You can define any number of snippets in any configuration you want.