don't use strings for paths

src/rpc_server.rs

@@ -1,11 +1,12 @@
 use std::net::SocketAddr;
+use std::path::PathBuf;
 use jsonrpsee::server::{ServerBuilder, ServerHandle};
 use jsonrpsee::RpcModule;
 
 use crate::rpc::{RpcServer, RpcServerImpl};
 
 /// Start the RPC server on the specified address
-pub async fn start_rpc_server(addr: SocketAddr, base_dir: String, backend: crate::options::BackendType, admin_secret: String) -> Result<ServerHandle, Box<dyn std::error::Error + Send + Sync>> {
+pub async fn start_rpc_server(addr: SocketAddr, base_dir: PathBuf, backend: crate::options::BackendType, admin_secret: String) -> Result<ServerHandle, Box<dyn std::error::Error + Send + Sync>> {
     // Create the RPC server implementation
     let rpc_impl = RpcServerImpl::new(base_dir, backend, admin_secret);
 
@@ -34,7 +35,7 @@ mod tests {
     #[tokio::test]
     async fn test_rpc_server_startup() {
         let addr = "127.0.0.1:0".parse().unwrap(); // Use port 0 for auto-assignment
-        let base_dir = "/tmp/test_rpc".to_string();
+        let base_dir = PathBuf::from("/tmp/test_rpc");
         let backend = crate::options::BackendType::Redb; // Default for test
 
         let handle = start_rpc_server(addr, base_dir, backend, "test-admin".to_string()).await.unwrap();