In large stock pan over medium heat, add the olive oil, onion, and fennel. Saute until the onion is translucent, about 10 minutes. Add the garlic and 3/4 teaspoon of red pepper flakes, oregano, thyme, saffron, and saute 2 minutes. Stir in the tomato paste. Add tomatoes with their juices, wine, clam juice stock and bay leaf. Cover and bring to a simmer. Reduce the heat to medium-low. Cover and simmer until the flavors blend, about 30 minutes.