diff --git a/database/migrations/2026_07_16_000001_create_units_and_link_unit_id.php b/database/migrations/2026_07_16_000001_create_units_and_link_unit_id.php
index 7cf2388..662a293 100644
--- a/database/migrations/2026_07_16_000001_create_units_and_link_unit_id.php
+++ b/database/migrations/2026_07_16_000001_create_units_and_link_unit_id.php
@@ -81,11 +81,14 @@ return new class extends Migration
             }
             $extraCodes = $extraCodes->unique();
 
-            $existingCodes = DB::table('units')->where('company_id', $companyId)->pluck('code')->all();
+            // Case-insensitive dedupe: MariaDB default collation treats 'L' == 'l'
+            // as the same value on the unique index, so we compare lowercased.
+            $existingCodes = DB::table('units')->where('company_id', $companyId)
+                ->pluck('code')->map(fn ($c) => mb_strtolower((string) $c))->all();
             foreach ($extraCodes as $code) {
-                if (in_array($code, $existingCodes, true)) continue;
+                if (in_array(mb_strtolower($code), $existingCodes, true)) continue;
                 if (mb_strlen($code) > 16) continue;
-                DB::table('units')->insert([
+                DB::table('units')->insertOrIgnore([
                     'company_id' => $companyId,
                     'code' => $code,
                     'name_ro' => $code,