Having plugged your numbers into the pricing for both Neon and Planetscale I'm rather confused. At Planetscale, given the numbers cited in the post, you're paying for 4 servers (+ replicas) with one eighth of a vCPU each, running 24/7. That's equivalent to about 375 Neon compute-hours per month. Your $69 Neon plan included twice that. Neon only goes down to 1/4th of a vCPU, but that does include the same amount of memory as the 1/8th at Planetscale, so take that 4 times and you have 4 databases running all month for the price of your $69 plan at Neon. How did you get to $250?
Honestly, I don't even know. My last month bill was for 1947 compute hours for a total of $260. I just have the 4 databases. Looks like two of them are at .5 instead of .25, maybe that's it? Unless they are auto scaling me up occasionally and I'm not aware?
Two of them being at 0.5 brings the total to 1.5 vCPU, which over an entire month adds about another 375 compute hours for an extra $60, which is still much lower. Indeed autoscaling seems like it could be the cause. According to the documentation that's a setting you can configure per "compute", but I don't know if it's the default.
