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Are you intending to have a full roof or is it an open framed structure? If it is open framed, and the slab is 4-5" thick there is no compelling structural reason to add footings. I would likely pour little concrete posts for the wooden posts to sit on to keep the end grain from sitting in pools of water. I would drill and grout in some rebar pins into the existing slab and cast in a saddle to accept the wooden post. Anyway, good luck with the project.
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