Added characteristic value migration file

database/migrations/2026_09_20_111212_create_characteristic_values_table.php

@@ -0,0 +1,48 @@
+<?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
+    {
+        $sql = <<<'SQL'
+            CREATE TABLE characteristic_values (
+                id					               	BIGINT GENERATED always AS IDENTITY PRIMARY KEY,
+                plant_id							BIGINT NOT NULL,
+                line_id                             BIGINT NOT NULL,
+                item_id							    BIGINT NOT NULL,
+                machine_id                          BIGINT NOT NULL,
+
+                process_order                       TEXT DEFAULT NULL,
+                coil_number                         TEXT DEFAULT NULL,
+                status                              TEXT DEFAULT NULL,
+
+                created_at							TIMESTAMP NOT NULL DEFAULT NOW(),
+                updated_at							TIMESTAMP NOT NULL DEFAULT NOW(),
+                created_by							TEXT DEFAULT NULL,
+                updated_by							TEXT DEFAULT NULL,
+                deleted_at			                TIMESTAMP,
+
+                FOREIGN KEY (plant_id)              REFERENCES plants (id),
+                FOREIGN KEY (line_id)               REFERENCES lines (id),
+                FOREIGN KEY (item_id)               REFERENCES items (id),
+                FOREIGN KEY (machine_id)            REFERENCES machines (id)
+            );
+        SQL;
+        DB::statement($sql);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('characteristic_values');
+    }
+};

database/migrations/2026_09_20_111529_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) {
+        //     //
+        // });
+    }
+};