diff --git a/database/migrations/2026_07_23_030609_create_product_table.php b/database/migrations/2026_07_23_030609_create_product_table.php
index 37ac733..ed8cfad 100644
--- a/database/migrations/2026_07_23_030609_create_product_table.php
+++ b/database/migrations/2026_07_23_030609_create_product_table.php
@@ -32,18 +32,18 @@ return new class extends Migration
                 $table->increments('id')->comment('商品ID');
                 $table->integer('category_id')->default(0)->comment('商品分类ID');
                 $table->integer('supplier_id')->default(0)->comment('默认供应商ID');
-                $table->string('market', 50)->default('')->comment('市场（如：新发地、岳各庄）');
+                $table->string('market', 50)->default('')->nullable()->comment('市场（如：新发地、岳各庄）');
                 $table->string('name', 100)->comment('品名');
                 $table->string('spec', 100)->default('')->comment('规格/包规');
                 $table->string('unit', 20)->default('斤')->comment('计价单位（斤/件/箱等）');
                 $table->string('image_ids', 255)->default('')->comment('商品图片');
                 $table->text('content')->comment('商品图文详情');
                 $table->integer('sort')->default(0)->comment('排序');
-                $table->integer('shelf_life')->default(0)->comment('保质期');
+                $table->integer('shelf_life')->default(0)->nullable()->comment('保质期');
                 $table->integer('stock')->default(0)->comment('库存');
                 $table->integer('status')->default(1)->comment('状态（1上架 0下架）');
                 $table->decimal('cost_price', 10, 2)->default(0)->comment('成本价（元，成本百分比计价基数）');
-                $table->string('remark', 255)->default('')->comment('备注');
+                $table->string('remark', 255)->nullable()->default('')->comment('备注');
                 $table->timestamps();
                 $table->softDeletes();
                 $table->index(['category_id', 'status'], 'product_category_status_index');
diff --git a/database/migrations/2026_07_23_030610_create_store_order_table.php b/database/migrations/2026_07_23_030610_create_store_order_table.php
index 6db2a30..12e46bf 100644
--- a/database/migrations/2026_07_23_030610_create_store_order_table.php
+++ b/database/migrations/2026_07_23_030610_create_store_order_table.php
@@ -25,7 +25,7 @@ return new class extends Migration
                 $table->decimal('total_weight', 10, 3)->default(0)->comment('总重量');
                 $table->decimal('total_amount', 10, 2)->default(0)->comment('订单总金额');
                 $table->integer('status')->default(0)->comment('订单状态（0待接单 1已接单 2采购中 3配送中 4已完成 9已取消）');
-                $table->string('remark', 255)->default('')->comment('订单备注');
+                $table->string('remark', 255)->default('')->nullable()->comment('订单备注');
                 $table->softDeletes();
                 $table->timestamps();
                 $table->index(['store_id', 'order_date'], 'store_order_store_date_index');
diff --git a/database/migrations/2026_07_23_030611_create_purchase_table.php b/database/migrations/2026_07_23_030611_create_purchase_table.php
index 5ad2884..146ba68 100644
--- a/database/migrations/2026_07_23_030611_create_purchase_table.php
+++ b/database/migrations/2026_07_23_030611_create_purchase_table.php
@@ -24,7 +24,7 @@ return new class extends Migration
                 $table->decimal('estimate_amount', 10, 2)->default(0)->comment('预估金额（按订货汇总）');
                 $table->decimal('actual_amount', 10, 2)->default(0)->comment('实际采购金额');
                 $table->integer('operator_id')->default(0)->comment('采购员（系统用户ID）');
-                $table->string('remark', 255)->default('')->comment('备注');
+                $table->string('remark', 255)->default('')->nullable()->comment('备注');
                 $table->timestamps();
                 $table->index(['purchase_date', 'status'], 'purchase_order_date_status_index');
                 $table->comment('采购单表');
diff --git a/database/migrations/2026_08_13_000001_create_bill_table.php b/database/migrations/2026_08_13_000001_create_bill_table.php
index de3b23b..f3fba42 100644
--- a/database/migrations/2026_08_13_000001_create_bill_table.php
+++ b/database/migrations/2026_08_13_000001_create_bill_table.php
@@ -35,7 +35,7 @@ return new class extends Migration
                 $table->string('pay_remark', 255)->default('')->comment('付款备注（线下收款信息）');
                 $table->integer('paid_operator_id')->default(0)->comment('收款操作人（后台系统用户ID）');
                 $table->integer('operator_id')->default(0)->comment('生成人（后台系统用户ID）');
-                $table->string('remark', 255)->default('')->comment('备注');
+                $table->string('remark', 255)->nullable()->default('')->comment('备注');
                 $table->timestamps();
                 $table->unique(['purchase_id', 'store_id'], 'bill_purchase_store_unique');
                 $table->index(['store_id', 'bill_date'], 'bill_store_date_index');