refactor: implement classification ID resolution in sub-classification migration process

app/Console/Commands/MigrateClassificationCommand.php

@@ -112,11 +112,19 @@ private function processSubClassification($legacy): void
 
         $this->output->write("{$idOutput} (SUB) Processing: <comment>".Str::limit($legacy->name, 40).'</comment>... ');
 
+        $classId = $this->resolveClassificationId($legacy->classification);
+
+        if (! $classId) {
+            $this->output->writeln('<error>FAILED: classification not resolved</error>');
+
+            return;
+        }
+
         try {
             DB::table('sub_classifications')->updateOrInsert(
                 ['id' => $legacy->id],
                 [
-                    'classification_id' => $legacy->classification, // Foreign key to classifications
+                    'classification_id' => $classId,
                     'name' => $legacy->name,
                     'is_active' => $legacy->status == '1' ? IsActive::ACTIVE->value : IsActive::INACTIVE->value,
                     'created_at' => $legacy->created_at ?? now(),
@@ -130,4 +138,30 @@ private function processSubClassification($legacy): void
             $this->output->writeln('<error>FAILED: '.$e->getMessage().'</error>');
         }
     }
+
+    private function resolveClassificationId($legacyClassificationId): ?int
+    {
+        $legacyClass = DB::connection('mysql_second')
+            ->table('classifications')
+            ->where('id', $legacyClassificationId)
+            ->first();
+
+        if (! $legacyClass) {
+            return null;
+        }
+
+        $existing = DB::table('classifications')
+            ->where('id', $legacyClass->id)
+            ->whereNull('deleted_at')
+            ->value('id');
+
+        if ($existing) {
+            return $existing;
+        }
+
+        return DB::table('classifications')
+            ->where('name', $legacyClass->name)
+            ->whereNull('deleted_at')
+            ->value('id');
+    }
 }