5 - Add buffer_multiplier column to buckets table

database/migrations/2026_03_20_000000_add_buffer_multiplier_to_buckets_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('buckets', function (Blueprint $table) {
+            $table->decimal('buffer_multiplier', 5, 2)
+                ->default(0)
+                ->after('allocation_value')
+                ->comment('Multiplier for buffer capacity on fixed_limit buckets. 0 = no buffer, 1 = 100% extra capacity');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('buckets', function (Blueprint $table) {
+            $table->dropColumn('buffer_multiplier');
+        });
+    }
+};