Slice the bacon into small chunks. Place a large dutch oven or pot over low heat and add in the bacon to render, 8-10 minutes.
As bacon cooks, finely chop the shallot, celery, mushrooms, and carrot into 1/4" dice (the food processor is your friend). Once the bacon is just browned, remove from the pot (but leave the fat). Add in the shallot/celery/carrot/mushrooms and cook for 10 minutes, stirring often.
Once veggies are just browned, add in ground pork along with a pinch of salt (1/4 teaspoon) and pepper. Turn heat to high and brown pork, another 8-10 minutes.
Once pork is browned, add in minced garlic and tomato paste. Cook for 2-3 minutes, then add in the red wine. Cook until the wine is reduced by 1/3.
Add in crushed tomatoes and 1/4 cup of the grated Parmesan and turn heat to medium. Simmer for ~15 minutes. As sauce simmers, prepare pasta according to package directions (minus 2 minutes).
Once pasta is cooked, reserve 1/3 cup of the cooking water and drain. Slowly incorporate the pasta water into the sauce, stirring for 1-2 minutes. Once the water has been absorbed, the dish is ready. Serve pasta layered with sauce, cooked bacon, more Parmesan, and torn fresh sage leaves.