diff --git a/app/Http/Controllers/Admin/FeedbackController.php b/app/Http/Controllers/Admin/FeedbackController.php
index a6e4832..26c785d 100644
--- a/app/Http/Controllers/Admin/FeedbackController.php
+++ b/app/Http/Controllers/Admin/FeedbackController.php
@@ -73,13 +73,6 @@ public function update(FeedbackRequest $request, Feedback $feedback): RedirectRe
         return to_route('admin.feedback.index');
     }
 
-    public function updateStatus(UpdateFeedbackStatusRequest $request, Feedback $feedback): RedirectResponse
-    {
-        $this->service->updateStatus($feedback, $request->validated('status'));
-
-        return Inertia::flash('toast', ['type' => 'success', 'message' => 'Status masukan berhasil diperbarui.'])->back();
-    }
-
     public function destroy(Request $request, Feedback $feedback): RedirectResponse
     {
         abort_unless($feedback->user_id === $request->user()->id, 403);
@@ -88,4 +81,11 @@ public function destroy(Request $request, Feedback $feedback): RedirectResponse
 
         return Inertia::flash('toast', ['type' => 'success', 'message' => 'Masukan berhasil dihapus.'])->back();
     }
+
+    public function updateStatus(UpdateFeedbackStatusRequest $request, Feedback $feedback): RedirectResponse
+    {
+        $this->service->updateStatus($feedback, $request->validated('status'));
+
+        return Inertia::flash('toast', ['type' => 'success', 'message' => 'Status masukan berhasil diperbarui.'])->back();
+    }
 }
diff --git a/app/Http/Requests/Admin/AcademicClasses/ScheduleRequest.php b/app/Http/Requests/Admin/AcademicClasses/ScheduleRequest.php
index 3dbc0c6..3a2b92e 100644
--- a/app/Http/Requests/Admin/AcademicClasses/ScheduleRequest.php
+++ b/app/Http/Requests/Admin/AcademicClasses/ScheduleRequest.php
@@ -17,7 +17,7 @@ public function rules(): array
     {
         return [
             'course_class_id' => ['required', 'integer', Rule::exists('course_classes', 'id')],
-            'day_of_week' => ['required', 'string', Rule::in(DayOfWeek::values())],
+            'day_of_week' => ['required', 'string', Rule::enum(DayOfWeek::class)],
             'start_time' => ['required', 'date_format:H:i'],
             'end_time' => ['required', 'date_format:H:i', 'after:start_time'],
             'room' => ['nullable', 'string', 'max:20'],
diff --git a/app/Http/Requests/Admin/Feedback/FeedbackRequest.php b/app/Http/Requests/Admin/Feedback/FeedbackRequest.php
index f72828b..0a32d11 100644
--- a/app/Http/Requests/Admin/Feedback/FeedbackRequest.php
+++ b/app/Http/Requests/Admin/Feedback/FeedbackRequest.php
@@ -16,7 +16,7 @@ public function authorize(): bool
     public function rules(): array
     {
         return [
-            'type' => ['required', 'string', Rule::in(FeedbackType::values())],
+            'type' => ['required', 'string', Rule::enum(FeedbackType::class)],
             'subject' => ['required', 'string', 'max:150'],
             'message' => ['required', 'string'],
         ];
diff --git a/app/Http/Requests/Admin/Manage/CourseClassRequest.php b/app/Http/Requests/Admin/Manage/CourseClassRequest.php
index 3c56804..0d4ada1 100644
--- a/app/Http/Requests/Admin/Manage/CourseClassRequest.php
+++ b/app/Http/Requests/Admin/Manage/CourseClassRequest.php
@@ -69,7 +69,7 @@ function ($attribute, $value, $fail) {
                     },
                 ],
                 'academic_term_id' => ['required', 'integer', Rule::exists('academic_terms', 'id')],
-                'method' => ['nullable', 'string', Rule::in(ClassMethod::values())],
+                'method' => ['nullable', 'string', Rule::enum(ClassMethod::class)],
             ];
         }
 
@@ -92,7 +92,7 @@ function ($attribute, $value, $fail) {
                 Rule::exists('lecturer_department', 'lecturer_id')->where('department_id', $departmentId),
             ],
             'academic_term_id' => ['required', 'integer', Rule::exists('academic_terms', 'id')],
-            'method' => ['nullable', 'string', Rule::in(ClassMethod::values())],
+            'method' => ['nullable', 'string', Rule::enum(ClassMethod::class)],
         ];
     }
 }
diff --git a/app/Http/Requests/Admin/Master/AcademicTermRequest.php b/app/Http/Requests/Admin/Master/AcademicTermRequest.php
index db56914..e1e24c5 100644
--- a/app/Http/Requests/Admin/Master/AcademicTermRequest.php
+++ b/app/Http/Requests/Admin/Master/AcademicTermRequest.php
@@ -38,7 +38,7 @@ function ($attribute, $value, $fail) {
             'semester' => [
                 'required',
                 'string',
-                Rule::in(Semester::values()),
+                Rule::enum(Semester::class),
                 Rule::unique('academic_terms')->where(function ($query) {
                     return $query->where('academic_year', $this->input('academic_year'));
                 })->ignore($this->route('academic_term')),
diff --git a/app/Http/Requests/Admin/Users/AdministratorRequest.php b/app/Http/Requests/Admin/Users/AdministratorRequest.php
index 9efbbdb..b575801 100644
--- a/app/Http/Requests/Admin/Users/AdministratorRequest.php
+++ b/app/Http/Requests/Admin/Users/AdministratorRequest.php
@@ -43,7 +43,7 @@ public function rules(): array
             'full_name' => ['required', 'string', 'max:150'],
             'phone_number' => ['required', 'string', 'max:20'],
             'address' => ['required', 'string'],
-            'gender' => ['required', 'string', Rule::in(Gender::values())],
+            'gender' => ['required', 'string', Rule::enum(Gender::class)],
             'birth_date' => ['required', 'date'],
             'birth_place' => ['required', 'string', 'max:100'],
         ];
diff --git a/app/Http/Requests/Admin/Users/LecturerRequest.php b/app/Http/Requests/Admin/Users/LecturerRequest.php
index 44a67cf..93186a6 100644
--- a/app/Http/Requests/Admin/Users/LecturerRequest.php
+++ b/app/Http/Requests/Admin/Users/LecturerRequest.php
@@ -42,7 +42,7 @@ public function rules(): array
             'full_name' => ['required', 'string', 'max:150'],
             'phone_number' => ['required', 'string', 'max:20'],
             'address' => ['required', 'string'],
-            'gender' => ['required', 'string', Rule::in(Gender::values())],
+            'gender' => ['required', 'string', Rule::enum(Gender::class)],
             'birth_date' => ['required', 'date'],
             'birth_place' => ['required', 'string', 'max:100'],
 
diff --git a/app/Http/Requests/Admin/Users/Student/StudentRequest.php b/app/Http/Requests/Admin/Users/Student/StudentRequest.php
index 533283c..9e52037 100644
--- a/app/Http/Requests/Admin/Users/Student/StudentRequest.php
+++ b/app/Http/Requests/Admin/Users/Student/StudentRequest.php
@@ -43,7 +43,7 @@ public function rules(): array
             'full_name' => ['required', 'string', 'max:150'],
             'phone_number' => ['required', 'string', 'max:20'],
             'address' => ['required', 'string'],
-            'gender' => ['required', 'string', Rule::in(Gender::values())],
+            'gender' => ['required', 'string', Rule::enum(Gender::class)],
             'birth_date' => ['required', 'date'],
             'birth_place' => ['required', 'string', 'max:100'],
 
@@ -79,7 +79,7 @@ public function rules(): array
             'status' => [
                 'nullable',
                 'string',
-                Rule::in(StudentStatus::values()),
+                Rule::enum(StudentStatus::class),
             ],
         ];
     }
diff --git a/app/Http/Requests/Admin/Users/Student/StudentStatusRequest.php b/app/Http/Requests/Admin/Users/Student/StudentStatusRequest.php
index c9a2066..f356e9a 100644
--- a/app/Http/Requests/Admin/Users/Student/StudentStatusRequest.php
+++ b/app/Http/Requests/Admin/Users/Student/StudentStatusRequest.php
@@ -16,7 +16,7 @@ public function authorize(): bool
     public function rules(): array
     {
         return [
-            'status' => ['required', 'string', Rule::in(StudentStatus::values())],
+            'status' => ['required', 'string', Rule::enum(StudentStatus::class)],
         ];
     }
 }
diff --git a/app/Http/Requests/PaginatedRequest.php b/app/Http/Requests/PaginatedRequest.php
index 5089a74..94fd959 100644
--- a/app/Http/Requests/PaginatedRequest.php
+++ b/app/Http/Requests/PaginatedRequest.php
@@ -22,19 +22,19 @@ public function rules(): array
             'per_page' => ['nullable', 'integer', 'in:25,50,100,999999'],
             'search' => ['nullable', 'string', 'max:255'],
             'highlight' => ['nullable', 'integer'],
-            'gender' => ['nullable', 'string', Rule::in(Gender::values())],
+            'gender' => ['nullable', 'string', Rule::enum(Gender::class)],
             'department_id' => ['nullable', 'integer'],
             'status' => ['nullable', 'string'],
             'enrollment_year' => ['nullable', 'integer'],
             'semester_number' => ['nullable', 'integer'],
-            'semester' => ['nullable', 'string', Rule::in(Semester::values())],
+            'semester' => ['nullable', 'string', Rule::enum(Semester::class)],
             'is_active' => ['nullable', Rule::in(['true', 'false'])],
             'academic_term_id' => ['nullable', 'integer'],
-            'method' => ['nullable', 'string', Rule::in(ClassMethod::values())],
+            'method' => ['nullable', 'string', Rule::enum(ClassMethod::class)],
             'course_class_id' => ['nullable', 'integer'],
             'lecturer_id' => ['nullable', 'integer'],
             'type' => ['nullable', 'string'],
-            'payment_method' => ['nullable', 'string', Rule::in(PaymentMethod::values())],
+            'payment_method' => ['nullable', 'string', Rule::enum(PaymentMethod::class)],
             'file' => ['nullable', 'string'],
             'level' => ['nullable', 'string'],
         ];
diff --git a/app/Models/AcademicAdvisingLog.php b/app/Models/AcademicAdvisingLog.php
index bb16d8d..3a8eecd 100644
--- a/app/Models/AcademicAdvisingLog.php
+++ b/app/Models/AcademicAdvisingLog.php
@@ -13,13 +13,13 @@ class AcademicAdvisingLog extends Model
 {
     use HasFactory;
 
-    public function students(): BelongsToMany
-    {
-        return $this->belongsToMany(Student::class);
-    }
-
     public function lecturer(): BelongsTo
     {
         return $this->belongsTo(Lecturer::class);
     }
+
+    public function students(): BelongsToMany
+    {
+        return $this->belongsToMany(Student::class);
+    }
 }
diff --git a/app/Models/AcademicTerm.php b/app/Models/AcademicTerm.php
index 472977e..543ebdc 100644
--- a/app/Models/AcademicTerm.php
+++ b/app/Models/AcademicTerm.php
@@ -16,6 +16,21 @@ class AcademicTerm extends Model
 {
     use HasFactory;
 
+    public function courseClasses(): HasMany
+    {
+        return $this->hasMany(CourseClass::class);
+    }
+
+    public function courseRegistrations(): HasMany
+    {
+        return $this->hasMany(CourseRegistration::class);
+    }
+
+    public function courseRegistrationSubmissions(): HasMany
+    {
+        return $this->hasMany(CourseRegistrationSubmission::class);
+    }
+
     public function tuitionInvoices(): HasMany
     {
         return $this->hasMany(TuitionInvoice::class);
diff --git a/app/Models/Announcement.php b/app/Models/Announcement.php
index 9b63673..643a9da 100644
--- a/app/Models/Announcement.php
+++ b/app/Models/Announcement.php
@@ -13,13 +13,13 @@ class Announcement extends Model
 {
     use HasFactory, SoftDeletes;
 
-    public function department(): BelongsTo
-    {
-        return $this->belongsTo(Department::class);
-    }
-
     public function creator(): BelongsTo
     {
         return $this->belongsTo(User::class, 'created_by');
     }
+
+    public function department(): BelongsTo
+    {
+        return $this->belongsTo(Department::class);
+    }
 }
diff --git a/app/Models/CourseClass.php b/app/Models/CourseClass.php
index 44a3374..a981b97 100644
--- a/app/Models/CourseClass.php
+++ b/app/Models/CourseClass.php
@@ -22,6 +22,11 @@ protected function casts(): array
         ];
     }
 
+    public function academicTerm(): BelongsTo
+    {
+        return $this->belongsTo(AcademicTerm::class);
+    }
+
     public function course(): BelongsTo
     {
         return $this->belongsTo(Course::class);
@@ -32,9 +37,14 @@ public function lecturer(): BelongsTo
         return $this->belongsTo(Lecturer::class);
     }
 
-    public function academicTerm(): BelongsTo
+    public function assignments(): HasMany
     {
-        return $this->belongsTo(AcademicTerm::class);
+        return $this->hasMany(Assignment::class);
+    }
+
+    public function attendances(): HasMany
+    {
+        return $this->hasMany(Attendance::class);
     }
 
     public function enrollments(): HasMany
@@ -47,23 +57,13 @@ public function materials(): HasMany
         return $this->hasMany(Material::class);
     }
 
-    public function assignments(): HasMany
+    public function registrations(): HasMany
     {
-        return $this->hasMany(Assignment::class);
+        return $this->hasMany(CourseRegistration::class);
     }
 
     public function schedules(): HasMany
     {
         return $this->hasMany(Schedule::class);
     }
-
-    public function attendances(): HasMany
-    {
-        return $this->hasMany(Attendance::class);
-    }
-
-    public function registrations(): HasMany
-    {
-        return $this->hasMany(CourseRegistration::class);
-    }
 }
diff --git a/app/Models/CourseRegistration.php b/app/Models/CourseRegistration.php
index b836b13..1a95fd5 100644
--- a/app/Models/CourseRegistration.php
+++ b/app/Models/CourseRegistration.php
@@ -12,11 +12,6 @@ class CourseRegistration extends Model
 {
     use HasFactory;
 
-    public function student(): BelongsTo
-    {
-        return $this->belongsTo(Student::class);
-    }
-
     public function academicTerm(): BelongsTo
     {
         return $this->belongsTo(AcademicTerm::class);
@@ -27,6 +22,11 @@ public function courseClass(): BelongsTo
         return $this->belongsTo(CourseClass::class);
     }
 
+    public function student(): BelongsTo
+    {
+        return $this->belongsTo(Student::class);
+    }
+
     public function submission(): BelongsTo
     {
         return $this->belongsTo(CourseRegistrationSubmission::class, 'submission_id');
diff --git a/app/Models/CourseRegistrationSubmission.php b/app/Models/CourseRegistrationSubmission.php
index faf9471..23414fb 100644
--- a/app/Models/CourseRegistrationSubmission.php
+++ b/app/Models/CourseRegistrationSubmission.php
@@ -35,11 +35,6 @@ public function registerMediaCollections(): void
         $this->addMediaCollection('advisor_signature')->singleFile();
     }
 
-    public function student(): BelongsTo
-    {
-        return $this->belongsTo(Student::class);
-    }
-
     public function academicTerm(): BelongsTo
     {
         return $this->belongsTo(AcademicTerm::class);
@@ -50,6 +45,11 @@ public function reviewer(): BelongsTo
         return $this->belongsTo(User::class, 'reviewed_by');
     }
 
+    public function student(): BelongsTo
+    {
+        return $this->belongsTo(Student::class);
+    }
+
     public function courseRegistrations(): HasMany
     {
         return $this->hasMany(CourseRegistration::class, 'submission_id');
diff --git a/app/Models/CourseRegistrationSubmissionLog.php b/app/Models/CourseRegistrationSubmissionLog.php
index 7bf523c..fb56e15 100644
--- a/app/Models/CourseRegistrationSubmissionLog.php
+++ b/app/Models/CourseRegistrationSubmissionLog.php
@@ -17,13 +17,13 @@ protected function casts(): array
         ];
     }
 
-    public function submission(): BelongsTo
-    {
-        return $this->belongsTo(CourseRegistrationSubmission::class, 'submission_id');
-    }
-
     public function actor(): BelongsTo
     {
         return $this->belongsTo(User::class, 'actor_id');
     }
+
+    public function submission(): BelongsTo
+    {
+        return $this->belongsTo(CourseRegistrationSubmission::class, 'submission_id');
+    }
 }
diff --git a/app/Models/Department.php b/app/Models/Department.php
index 597597c..8791274 100644
--- a/app/Models/Department.php
+++ b/app/Models/Department.php
@@ -15,14 +15,19 @@ class Department extends Model
 {
     use HasFactory, SoftDeletes;
 
-    public function lecturers(): BelongsToMany
+    public function currentLeader(): HasOne
     {
-        return $this->belongsToMany(Lecturer::class, 'lecturer_department');
+        return $this->hasOne(DepartmentLeadership::class)->whereNull('ended_at');
     }
 
-    public function students(): HasMany
+    public function announcements(): HasMany
     {
-        return $this->hasMany(Student::class);
+        return $this->hasMany(Announcement::class);
+    }
+
+    public function courses(): HasMany
+    {
+        return $this->hasMany(Course::class);
     }
 
     public function leaderships(): HasMany
@@ -30,8 +35,13 @@ public function leaderships(): HasMany
         return $this->hasMany(DepartmentLeadership::class);
     }
 
-    public function currentLeader(): HasOne
+    public function students(): HasMany
     {
-        return $this->hasOne(DepartmentLeadership::class)->whereNull('ended_at');
+        return $this->hasMany(Student::class);
+    }
+
+    public function lecturers(): BelongsToMany
+    {
+        return $this->belongsToMany(Lecturer::class, 'lecturer_department');
     }
 }
diff --git a/app/Models/Feedback.php b/app/Models/Feedback.php
index 866363f..32c555c 100644
--- a/app/Models/Feedback.php
+++ b/app/Models/Feedback.php
@@ -24,13 +24,13 @@ protected function casts(): array
         ];
     }
 
-    public function user(): BelongsTo
-    {
-        return $this->belongsTo(User::class);
-    }
-
     public function handler(): BelongsTo
     {
         return $this->belongsTo(User::class, 'handled_by');
     }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
 }
diff --git a/app/Models/Lecturer.php b/app/Models/Lecturer.php
index 0d7a20a..768ae60 100644
--- a/app/Models/Lecturer.php
+++ b/app/Models/Lecturer.php
@@ -20,9 +20,9 @@ public function user(): BelongsTo
         return $this->belongsTo(User::class);
     }
 
-    public function departments(): BelongsToMany
+    public function academicAdvisingLogs(): HasMany
     {
-        return $this->belongsToMany(Department::class, 'lecturer_department');
+        return $this->hasMany(AcademicAdvisingLog::class);
     }
 
     public function advisees(): HasMany
@@ -30,13 +30,18 @@ public function advisees(): HasMany
         return $this->hasMany(Student::class, 'academic_advisor_id');
     }
 
+    public function courseClasses(): HasMany
+    {
+        return $this->hasMany(CourseClass::class);
+    }
+
     public function leaderships(): HasMany
     {
         return $this->hasMany(DepartmentLeadership::class);
     }
 
-    public function academicAdvisingLogs(): HasMany
+    public function departments(): BelongsToMany
     {
-        return $this->hasMany(AcademicAdvisingLog::class);
+        return $this->belongsToMany(Department::class, 'lecturer_department');
     }
 }
diff --git a/app/Models/LetterRequest.php b/app/Models/LetterRequest.php
index 2951b93..93c4d96 100644
--- a/app/Models/LetterRequest.php
+++ b/app/Models/LetterRequest.php
@@ -32,16 +32,16 @@ public function registerMediaCollections(): void
         $this->addMediaCollection('letter_result')->singleFile();
     }
 
-    public function user(): BelongsTo
-    {
-        return $this->belongsTo(User::class);
-    }
-
     public function processor(): BelongsTo
     {
         return $this->belongsTo(User::class, 'processed_by');
     }
 
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
     protected function resultUrl(): Attribute
     {
         return Attribute::make(
diff --git a/app/Models/Mahasiswa.php b/app/Models/Mahasiswa.php
deleted file mode 100644
index 98d023f..0000000
--- a/app/Models/Mahasiswa.php
+++ /dev/null
@@ -1,10 +0,0 @@
-<?php
-
-namespace App\Models;
-
-use Illuminate\Database\Eloquent\Model;
-
-class Mahasiswa extends Model
-{
-    //
-}
diff --git a/app/Models/Notification.php b/app/Models/Notification.php
index 68535e5..efbe8ed 100644
--- a/app/Models/Notification.php
+++ b/app/Models/Notification.php
@@ -19,13 +19,13 @@ protected function casts(): array
         ];
     }
 
-    public function user(): BelongsTo
-    {
-        return $this->belongsTo(User::class);
-    }
-
     public function creator(): BelongsTo
     {
         return $this->belongsTo(User::class, 'created_by');
     }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
 }
diff --git a/app/Models/Student.php b/app/Models/Student.php
index af8e842..78839ac 100644
--- a/app/Models/Student.php
+++ b/app/Models/Student.php
@@ -8,6 +8,7 @@
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasManyThrough;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 #[Guarded(['id'])]
@@ -22,9 +23,9 @@ protected function casts(): array
         ];
     }
 
-    public function user(): BelongsTo
+    public function academicAdvisor(): BelongsTo
     {
-        return $this->belongsTo(User::class);
+        return $this->belongsTo(Lecturer::class, 'academic_advisor_id');
     }
 
     public function department(): BelongsTo
@@ -32,19 +33,14 @@ public function department(): BelongsTo
         return $this->belongsTo(Department::class);
     }
 
-    public function academicAdvisor(): BelongsTo
+    public function user(): BelongsTo
     {
-        return $this->belongsTo(Lecturer::class, 'academic_advisor_id');
+        return $this->belongsTo(User::class);
     }
 
-    public function enrollments(): HasMany
+    public function academicAdvisingLogs(): HasMany
     {
-        return $this->hasMany(ClassEnrollment::class);
-    }
-
-    public function submissions(): HasMany
-    {
-        return $this->hasMany(Submission::class);
+        return $this->hasMany(AcademicAdvisingLog::class);
     }
 
     public function attendances(): HasMany
@@ -52,11 +48,6 @@ public function attendances(): HasMany
         return $this->hasMany(Attendance::class);
     }
 
-    public function tuitionInvoices(): HasMany
-    {
-        return $this->hasMany(TuitionInvoice::class);
-    }
-
     public function courseRegistrations(): HasMany
     {
         return $this->hasMany(CourseRegistration::class);
@@ -67,13 +58,30 @@ public function courseRegistrationSubmissions(): HasMany
         return $this->hasMany(CourseRegistrationSubmission::class);
     }
 
-    public function letterRequests(): HasMany
+    public function enrollments(): HasMany
     {
-        return $this->hasMany(LetterRequest::class);
+        return $this->hasMany(ClassEnrollment::class);
     }
 
-    public function academicAdvisingLogs(): HasMany
+    public function submissions(): HasMany
     {
-        return $this->hasMany(AcademicAdvisingLog::class);
+        return $this->hasMany(Submission::class);
+    }
+
+    public function tuitionInvoices(): HasMany
+    {
+        return $this->hasMany(TuitionInvoice::class);
+    }
+
+    public function letterRequests(): HasManyThrough
+    {
+        return $this->hasManyThrough(
+            LetterRequest::class,
+            User::class,
+            'id',
+            'user_id',
+            'user_id',
+            'id',
+        );
     }
 }
diff --git a/app/Models/TuitionInvoice.php b/app/Models/TuitionInvoice.php
index 67449e4..6801916 100644
--- a/app/Models/TuitionInvoice.php
+++ b/app/Models/TuitionInvoice.php
@@ -21,16 +21,16 @@ protected function casts(): array
         ];
     }
 
-    public function student(): BelongsTo
-    {
-        return $this->belongsTo(Student::class);
-    }
-
     public function academicTerm(): BelongsTo
     {
         return $this->belongsTo(AcademicTerm::class);
     }
 
+    public function student(): BelongsTo
+    {
+        return $this->belongsTo(Student::class);
+    }
+
     public function payments(): HasMany
     {
         return $this->hasMany(TuitionPayment::class, 'invoice_id');
diff --git a/app/Models/User.php b/app/Models/User.php
index 68107b4..9992b48 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -38,6 +38,11 @@ protected function fullName(): Attribute
         return Attribute::get(fn () => $this->profile?->full_name ?? $this->username);
     }
 
+    public function lecturer(): HasOne
+    {
+        return $this->hasOne(Lecturer::class);
+    }
+
     public function profile(): HasOne
     {
         return $this->hasOne(UserProfile::class);
@@ -48,9 +53,34 @@ public function student(): HasOne
         return $this->hasOne(Student::class);
     }
 
-    public function lecturer(): HasOne
+    public function courseRegistrationSubmissionLogs(): HasMany
     {
-        return $this->hasOne(Lecturer::class);
+        return $this->hasMany(CourseRegistrationSubmissionLog::class, 'actor_id');
+    }
+
+    public function createdAnnouncements(): HasMany
+    {
+        return $this->hasMany(Announcement::class, 'created_by');
+    }
+
+    public function createdNotifications(): HasMany
+    {
+        return $this->hasMany(Notification::class, 'created_by');
+    }
+
+    public function feedbacks(): HasMany
+    {
+        return $this->hasMany(Feedback::class);
+    }
+
+    public function handledFeedbacks(): HasMany
+    {
+        return $this->hasMany(Feedback::class, 'handled_by');
+    }
+
+    public function letterRequests(): HasMany
+    {
+        return $this->hasMany(LetterRequest::class);
     }
 
     public function notifications(): HasMany
@@ -58,9 +88,24 @@ public function notifications(): HasMany
         return $this->hasMany(Notification::class);
     }
 
-    public function feedbacks(): HasMany
+    public function processedLetterRequests(): HasMany
     {
-        return $this->hasMany(Feedback::class);
+        return $this->hasMany(LetterRequest::class, 'processed_by');
+    }
+
+    public function recordedTuitionPayments(): HasMany
+    {
+        return $this->hasMany(TuitionPayment::class, 'recorded_by');
+    }
+
+    public function reviewedCourseRegistrationSubmissions(): HasMany
+    {
+        return $this->hasMany(CourseRegistrationSubmission::class, 'reviewed_by');
+    }
+
+    public function uploads(): HasMany
+    {
+        return $this->hasMany(EditorUpload::class, 'uploaded_by');
     }
 
     public function isAdvisorOf(Student $student): bool