diff --git a/database/migrations/2025_12_27_124510_add_observed_value_column_to_characteristic_values.php b/database/migrations/2025_12_27_124510_add_observed_value_column_to_characteristic_values.php
new file mode 100644
index 0000000..22cddba
--- /dev/null
+++ b/database/migrations/2025_12_27_124510_add_observed_value_column_to_characteristic_values.php
@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        DB::statement(<<<SQL
+            ALTER TABLE characteristic_values
+            ADD COLUMN observed_value NUMERIC(10,3);
+        SQL);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('characteristic_values', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};