Add user and project rate editing across backend and frontend

backend/src/main/java/com/example/app/user/UserController.java

@@ -1,8 +1,13 @@
 package com.example.app.user;
 
+import com.example.app.user.UserDtos.UpdateUserRequest;
 import com.example.app.user.UserDtos.UserResponse;
+import jakarta.validation.Valid;
 import java.util.List;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
@@ -20,4 +25,9 @@ public class UserController {
   public List<UserResponse> list() {
     return userService.findAll();
   }
+
+  @PutMapping("/{id}")
+  public UserResponse update(@PathVariable Long id, @Valid @RequestBody UpdateUserRequest req) {
+    return userService.update(id, req);
+  }
 }

backend/src/main/java/com/example/app/user/UserDtos.java

@@ -1,7 +1,13 @@
 package com.example.app.user;
 
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.PositiveOrZero;
+
 public class UserDtos {
 
+  public record UpdateUserRequest(
+      @NotBlank String name, @PositiveOrZero int defaultHourlyRateCents) {}
+
   public record UserResponse(Long id, String name, int defaultHourlyRateCents) {
 
     public static UserResponse from(User user) {

backend/src/main/java/com/example/app/user/UserService.java

@@ -1,6 +1,8 @@
 package com.example.app.user;
 
+import com.example.app.user.UserDtos.UpdateUserRequest;
 import com.example.app.user.UserDtos.UserResponse;
+import jakarta.persistence.EntityNotFoundException;
 import java.util.List;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -18,4 +20,16 @@ public class UserService {
   public List<UserResponse> findAll() {
     return userRepository.findAll().stream().map(UserResponse::from).toList();
   }
+
+  @Transactional
+  public UserResponse update(Long id, UpdateUserRequest req) {
+    User user =
+        userRepository
+            .findById(id)
+            .orElseThrow(() -> new EntityNotFoundException("User not found: " + id));
+    user.setName(req.name());
+    user.setDefaultHourlyRateCents(req.defaultHourlyRateCents());
+    User saved = userRepository.save(user);
+    return UserResponse.from(saved);
+  }
 }