✏ EDIT: chit_edit.php

<?php
require_once __DIR__ . '/../includes/config.php';
header('Content-Type: application/json');
start_secure_session();
if (!is_logged_in('admin')) {
    echo json_encode(['success' => false, 'message' => 'Unauthorized']);
    exit;
}

$id = intval($_POST['id'] ?? 0);
$name = trim($_POST['name'] ?? '');
$total_amount = floatval($_POST['total_amount'] ?? 0);
$duration = intval($_POST['duration_months'] ?? 0);
$monthly = floatval($_POST['monthly_amount'] ?? 0);
$status = $_POST['status'] ?? 'active';
$start_date = $_POST['start_date'] ?? null;

if ($id <= 0 || $name === '' || $total_amount <= 0 || $duration <= 0 || $monthly <= 0) {
    echo json_encode(['success' => false, 'message' => 'Invalid input.']);
    exit;
}
if (!in_array($status, ['active','closed'])) {
    $status = 'active';
}

$conn = db_connect();
// Update chit
$stmt = $conn->prepare('UPDATE chit_groups SET name=?, total_amount=?, duration_months=?, monthly_amount=?, status=?, start_date=? WHERE id=?');
$stmt->bind_param('siiissi', $name, $total_amount, $duration, $monthly, $status, $start_date, $id);
$success = $stmt->execute();
$stmt->close();
$conn->close();

if ($success) {
    echo json_encode(['success' => true]);
} else {
    echo json_encode(['success' => false, 'message' => 'Database error: unable to update chit.']);
}

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