Backfill audit company ID (if one is present)

database/migrations/2026_04_20_200000_backfill_action_logs_company_id_from_item.php

@@ -0,0 +1,74 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * Backfill action_logs.company_id only for legacy asset audits where the
+ * value is currently NULL.
+ *
+ * Audits are only recorded on assets, so this migration intentionally scopes
+ * to action_type='audit' and item_type=App\Models\Asset.
+ *
+ * Rows whose asset genuinely has no company (assets.company_id IS NULL) are
+ * left as NULL.
+ */
+return new class extends Migration
+{
+    private const ASSET_CLASS = 'App\\Models\\Asset';
+    private const AUDIT_ACTION = 'audit';
+
+    public function up(): void
+    {
+        $this->updateAssetAuditLogs(DB::getDriverName());
+    }
+
+    public function down(): void
+    {
+        // This backfill is intentionally non-reversible — we cannot know which
+        // rows were NULL before the migration ran vs which were backfilled.
+    }
+
+    /**
+     * Stamp company_id for legacy audit rows tied to assets.
+     */
+    private function updateAssetAuditLogs(string $driver): void
+    {
+        if ($driver === 'mysql' || $driver === 'mariadb') {
+            // MySQL/MariaDB supports UPDATE ... JOIN directly
+            DB::statement("
+                UPDATE action_logs al
+                INNER JOIN assets src
+                    ON src.id = al.item_id
+                    AND src.company_id IS NOT NULL
+                SET al.company_id = src.company_id
+                WHERE al.action_type = ?
+                  AND al.item_type = ?
+                  AND al.company_id IS NULL
+                  AND al.deleted_at IS NULL
+            ", [self::AUDIT_ACTION, self::ASSET_CLASS]);
+        } else {
+            // SQLite / PostgreSQL: use a correlated subquery update
+            DB::statement("
+                UPDATE action_logs
+                SET company_id = (
+                    SELECT src.company_id
+                    FROM assets src
+                    WHERE src.id = action_logs.item_id
+                      AND src.company_id IS NOT NULL
+                    LIMIT 1
+                )
+                WHERE action_type = ?
+                  AND item_type = ?
+                  AND company_id IS NULL
+                  AND deleted_at IS NULL
+                  AND EXISTS (
+                      SELECT 1 FROM assets src2
+                      WHERE src2.id = action_logs.item_id
+                        AND src2.company_id IS NOT NULL
+                  )
+            ", [self::AUDIT_ACTION, self::ASSET_CLASS]);
+        }
+    }
+};
+