just one. And the max level is much higher then 145

Only one per level, plain and simple

If I remember correctly the max level is 712, the reason people say 145 is cause (even though you don't want to hear it) it's from Demon Soul's. That was usually around the ideal invading level for people. 120-140 give or take to have a solid build for a specific build type, weither it be a pure mage, solid tank, or healing faith. It's not really per se stat points per level it's how many souls you need to level a specific stat. When you start at lower levels it's round 600-700 souls to level for the pyro, but once you get to around level 35 it's around 7000-8000. This all comes back to Demon Soul's though since it is the predesecor to Dark Soul's.