Refactor AuditorAwareImpl to ensure non-null SecurityContext; update User entity to simplify JoinColumn annotations; add package-info.java for bootstrap package with NullMarked annotation.

Author: phongphongg

core/src/main/java/com/workastra/core/module/auditing/AuditorAwareImpl.java

@@ -13,7 +13,7 @@ public class AuditorAwareImpl implements AuditorAware<User> {
 
     @Override
     public Optional<User> getCurrentAuditor() {
-        return Optional.ofNullable(SecurityContextHolder.getContext())
+        return Optional.of(SecurityContextHolder.getContext())
             .map(SecurityContext::getAuthentication)
             .filter(Authentication::isAuthenticated)
             .map(Authentication::getPrincipal)

core/src/main/java/com/workastra/core/module/security/model/User.java

@@ -119,7 +119,7 @@ public class User implements UserDetails, CredentialsContainer {
     private Instant createdAt;
 
     @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "created_by", insertable = true, updatable = false)
+    @JoinColumn(name = "created_by", updatable = false)
     @CreatedBy
     private User createdBy;
 
@@ -128,15 +128,15 @@ public class User implements UserDetails, CredentialsContainer {
     private Instant updatedAt;
 
     @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "updated_by", insertable = true, updatable = true)
+    @JoinColumn(name = "updated_by")
     @LastModifiedBy
     private User updatedBy;
 
     @Column
     private @Nullable Instant deletedAt;
 
     @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "deleted_by", insertable = true, updatable = true)
+    @JoinColumn(name = "deleted_by")
     private @Nullable User deletedBy;
 
     @Override

iam/src/main/java/com/workastra/iam/bootstrap/package-info.java

@@ -0,0 +1,4 @@
+@NullMarked
+package com.workastra.iam.bootstrap;
+
+import org.jspecify.annotations.NullMarked;