curl -X POST https://instagres.com/api/v1/database \
  -H "Content-Type: application/json" \
  -d '{"ref": "my-app"}'

# Response:
# {
# "status": "UNCLAIMED",
# "projectId": "...",
# "connString": "postgresql://...",
# "claim_url": "https://instagres.com/db/...",
# "expires_at": "..."
# }