Added mfm meter model file

app/Models/MfmMeter.php

@@ -13,6 +13,7 @@ class MfmMeter extends Model
 
     protected $fillable = [
         'plant_id',
+        'device_master_id',
         'sequence',
 		'name',
         'created_at',
@@ -24,4 +25,9 @@ class MfmMeter extends Model
     {
         return $this->belongsTo(Plant::class);
     }
+    public function devicemaster(): BelongsTo
+    {
+        return $this->belongsTo(DeviceMaster::class, 'device_master_id');
+    }
+
 }

database/migrations/2025_07_30_112331_add_foreign_key _and _unique_key_to_mfm_meters.php

@@ -0,0 +1,40 @@
+<?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
+    {
+        $sql = <<<'SQL'
+            ALTER TABLE mfm_meters
+            ADD COLUMN device_master_id BIGINT NOT NULL,
+            ADD CONSTRAINT mfm_meters_device_master_id_fkey
+            FOREIGN KEY (device_master_id) REFERENCES device_masters(id);
+        SQL;
+
+        DB::statement($sql);
+
+        $sql1 = <<<'SQL'
+        ALTER TABLE mfm_meters
+        ADD UNIQUE (plant_id, device_master_id, name);
+        SQL;
+
+        DB::statement($sql1);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('mfm_meters', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};