first commit

database/migrations/2026_03_21_000004_create_columns_table.php

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+<?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::create('columns', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('table_id')->constrained('tables')->cascadeOnDelete();
+            $table->string('column_name');
+            $table->string('data_type');
+            $table->string('udt_name')->nullable();
+            $table->integer('ordinal_position');
+            $table->boolean('is_nullable')->default(true);
+            $table->string('column_default')->nullable();
+            $table->integer('character_maximum_length')->nullable();
+            $table->integer('numeric_precision')->nullable();
+            $table->integer('numeric_scale')->nullable();
+            $table->string('datetime_precision')->nullable();
+            $table->text('comment')->nullable();
+            $table->boolean('is_primary_key')->default(false);
+            $table->boolean('is_foreign_key')->default(false);
+            $table->boolean('is_indexed')->default(false);
+            // Column mapping for target database
+            $table->string('target_column_name')->nullable();
+            $table->string('target_data_type')->nullable();
+            $table->boolean('exclude_from_migration')->default(false);
+            $table->timestamps();
+
+            $table->unique(['table_id', 'column_name'], 'unique_column');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('columns');
+    }
+};