fix ec2 provisioning for cloud init

infra/db-setup.sh

@@ -15,14 +15,13 @@ NVME_DEV="/dev/nvme1n1"
 NVME_MOUNT="/data"
 
 if [ ! -d "$NVME_MOUNT" ]; then
-    # Find the NVMe instance store (not the root EBS)
-    # i3.large has one 475GB NVMe at /dev/nvme1n1 or similar
+    # Find the NVMe instance store — look for unmounted nvme devices
     if [ ! -b "$NVME_DEV" ]; then
-        # Try finding it
-        NVME_DEV=$(lsblk -dpno NAME,SIZE | grep -v "$(lsblk -dpno NAME /)" | head -1 | awk '{print $1}')
+        NVME_DEV=$(lsblk -dpno NAME | grep nvme | head -1)
         if [ -z "$NVME_DEV" ]; then
             echo "ERROR: Could not find NVMe instance store device"
-            echo "Run 'lsblk' and set NVME_DEV manually"
+            echo "Available devices:"
+            lsblk
             exit 1
         fi
     fi