diff --git a/app/Http/Controllers/Staff/StudyHistoryController.php b/app/Http/Controllers/Staff/StudyHistoryController.php
index 3bddd58..dae377c 100644
--- a/app/Http/Controllers/Staff/StudyHistoryController.php
+++ b/app/Http/Controllers/Staff/StudyHistoryController.php
@@ -32,8 +32,11 @@ public function save(StudyHistoryRequest $request)
         abort_unless(auth()->user()->can(Permission::StudyHistoryEdit) || auth()->user()->isAdmin(), 403);
         $this->decodeKeys();
         $details = StudyDetails::historyOnly($this->key);
-        $details->update($request->validated());
+        $payload = array_trim_strings($request->validated());
+        unset($payload['study_id']);
+        $details->update($payload);
 
-        return redirect()->route('staff.history.view', _h($this->key));
+        // return redirect()->route('staff.history.view', _h($this->key));
+        return redirect()->route('staff.history.view', $details->hash);
     }
 }
diff --git a/app/Http/Requests/StudyHistoryRequest.php b/app/Http/Requests/StudyHistoryRequest.php
index 4962818..fd433ea 100644
--- a/app/Http/Requests/StudyHistoryRequest.php
+++ b/app/Http/Requests/StudyHistoryRequest.php
@@ -2,6 +2,8 @@
 
 namespace App\Http\Requests;
 
+use App\Models\Study;
+use App\Rules\ExistsByHash;
 use Illuminate\Foundation\Http\FormRequest;
 
 class StudyHistoryRequest extends FormRequest
@@ -9,7 +11,7 @@ class StudyHistoryRequest extends FormRequest
     public function rules(): array
     {
         return [
-            'study_id' => ['required', 'exists:studies'],
+            'study_id' => ['required', new ExistsByHash(Study::class)],
             'clinical_history' => ['nullable'],
             'surgical_history' => ['nullable'],
             'lab_results' => ['nullable'],
diff --git a/app/Models/StudyDetails.php b/app/Models/StudyDetails.php
index 486ff08..ae965ee 100644
--- a/app/Models/StudyDetails.php
+++ b/app/Models/StudyDetails.php
@@ -30,11 +30,11 @@ protected function casts(): array
 
     public static function historyOnly(int $studyId): self
     {
-        return self::where('study_id', $studyId)->first(['id', 'study_id', 'clinical_history', 'surgical_history', 'lab_results', 'clinical_diagnosis']);
+        return self::where('study_id', $studyId)->firstOrFail(['id', 'study_id', 'clinical_history', 'surgical_history', 'lab_results', 'clinical_diagnosis']);
     }
 
     public static function seriesOnly(int $studyId): self
     {
-        return self::where('study_id', $studyId)->first(['id', 'study_id', 'series']);
+        return self::where('study_id', $studyId)->firstOrFail(['id', 'study_id', 'series']);
     }
 }
diff --git a/app/Models/Traits/HashableId.php b/app/Models/Traits/HashableId.php
index 029772b..07e6aa9 100644
--- a/app/Models/Traits/HashableId.php
+++ b/app/Models/Traits/HashableId.php
@@ -13,6 +13,11 @@ public static function idToHash(int $key): string
         return _h($key);
     }
 
+    public static function hashToId(string $hash): int
+    {
+        return unhash_it($hash);
+    }
+
     /**
      * Get HashId column name.
      */
diff --git a/app/Rules/ExistsByHashRule.php b/app/Rules/ExistsByHash.php
similarity index 85%
rename from app/Rules/ExistsByHashRule.php
rename to app/Rules/ExistsByHash.php
index 9ce52f3..bd37aea 100644
--- a/app/Rules/ExistsByHashRule.php
+++ b/app/Rules/ExistsByHash.php
@@ -25,16 +25,16 @@ public function __construct(string $class)
     {
         $this->model = new $class;
 
-        if (! method_exists($this->model, 'bootHashableId')) {
+        if (! method_exists($this->model, 'getHashAttribute')) {
             throw new InvalidArgumentException('Class does not use HashableId');
         }
 
-        parent::__construct($class, $this->model->shouldHashPersist() ? $this->model->getHashColumnName() : $this->model->getKeyName());
+        parent::__construct($class, $this->model->getKeyName());
     }
 
     public function validate(string $attribute, mixed $value, Closure $fail): void
     {
-        if (! $value || (! $this->model->shouldHashPersist() && ! $value = $this->model::hashToId($value))) {
+        if (! $value || (! $value = $this->model::hashToId($value))) {
             $this->fail($attribute, $fail);
 
             return;
diff --git a/app/helpers.php b/app/helpers.php
index a366c9b..52db5aa 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -31,6 +31,20 @@ function array_purge(array $ary): array
     }
 }
 
+if (! function_exists('array_trim_strings')) {
+    function array_trim_strings(array $ary): array
+    {
+        return array_filter($ary, function ($v) {
+            if (! is_string($v)) {
+                return $v;
+            }
+            $v = trim($v);
+
+            return blank($v) ? null : $v;
+        });
+    }
+}
+
 if (! function_exists('sync_agent_id')) {
     function sync_agent_id(): int
     {
diff --git a/resources/views/staff/history/edit.blade.php b/resources/views/staff/history/edit.blade.php
index 793725a..9f8ad0a 100644
--- a/resources/views/staff/history/edit.blade.php
+++ b/resources/views/staff/history/edit.blade.php
@@ -11,40 +11,34 @@
             <div class="mt-10 sm:mt-0">
                 <h4>Clinical Information</h4>
 
-                @dd($details)
-
-                <form action="{{ route('staff.history.save', _h($details->study_id)) }}" method="post">
+                <form action="{{ route('staff.history.save', $details->hash) }}" method="post">
                     @csrf
-                    <input type="hidden" name="study_id" value="{{ $details->study_id }}">
+                    <input type="hidden" name="study_id" value="{{ $details->hash }}">
                     <h5>Clinical History</h5>
                     <div class="p-4 border-gray-100">
-                    <textarea name="clinical_history" id="clinical_history" cols="30" rows="10"
-                              value="{!! $details->clinical_history !!}">
-                    </textarea>
+                        <textarea name="clinical_history" id="clinical_history" cols="90"
+                                  rows="10">{!! $details->clinical_history !!}</textarea>
                     </div>
                     <x-section-border/>
 
                     <h5>surgical history</h5>
                     <div class="p-4 border-gray-100">
-                    <textarea name="surgical_history" id="surgical_history" cols="30" rows="10"
-                              value="{!! $details->surgical_history !!}">
-                    </textarea>
+                        <textarea name="surgical_history" id="surgical_history" cols="90"
+                                  rows="10">{!! $details->surgical_history !!}</textarea>
                     </div>
                     <x-section-border/>
 
                     <h5>lab results</h5>
                     <div class="p-4 border-gray-100">
-                    <textarea name="lab_results" id="lab_results" cols="30" rows="10"
-                              value="{!! $details->lab_results !!}">
-                    </textarea>
+                        <textarea name="lab_results" id="lab_results" cols="90"
+                                  rows="10">{!! $details->lab_results !!}</textarea>
                     </div>
                     <x-section-border/>
 
                     <h5>clinical diagnosis</h5>
                     <div class="p-4 border-gray-100">
-                    <textarea name="clinical_diagnosis" id="clinical_diagnosis" cols="30" rows="10"
-                              value="{!! $details->clinical_diagnosis !!}">
-                    </textarea>
+                        <textarea name="clinical_diagnosis" id="clinical_diagnosis" cols="90"
+                                  rows="10">{!! $details->clinical_diagnosis !!}</textarea>
                     </div>
 
                     <button type="submit">Save</button>