Added production calendar migration file

database/migrations/2026_11_02_121052_create_production_calendars_table.php

@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $sql = <<<'SQL'
+            CREATE TABLE production_calendars (
+                id                        BIGINT GENERATED always AS IDENTITY PRIMARY KEY,
+                plant_id                  BIGINT NOT NULL,
+
+                working_days              TEXT DEFAULT NULL,
+                leave_dates               TEXT DEFAULT NULL,
+
+                created_at                TIMESTAMP NOT NULL DEFAULT NOW(),
+                updated_at                TIMESTAMP NOT NULL DEFAULT NOW(),
+                created_by                TEXT DEFAULT NULL,
+                updated_by                TEXT DEFAULT NULL,
+                deleted_at                TIMESTAMP,
+
+                FOREIGN KEY (plant_id)    REFERENCES  plants (id)
+            );
+        SQL;
+        DB::statement($sql);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('production_calendars');
+    }
+};