feat: Enhance user settings with cron URL plan display

- Added a new field to display the cron URL plan in user settings.
- Updated JavaScript to handle the new plan data.

refactor: Unify product model and migrate data

- Migrated product data from `products_data` to `products` table.
- Added new columns to `products` for better data organization.
- Created `products_aggregate` table for storing aggregated product metrics.

chore: Drop deprecated products_data table

- Removed `products_data` table as data is now stored in `products`.

feat: Add merchant URL flags to products

- Introduced flags for tracking merchant URL status in `products` table.
- Normalized product URLs to handle empty or invalid values.

feat: Link campaign alerts to specific products

- Added `product_id` column to `campaign_alerts` table for better tracking.
- Created an index for efficient querying of alerts by product.

chore: Add debug scripts for client data inspection

- Created debug scripts to inspect client data from local and remote databases.
- Included error handling and output formatting for better readability.

tmp/debug_clients.php

@@ -0,0 +1,32 @@
+<?php
+error_reporting(E_ALL);
+ini_set('display_errors', '1');
+echo "START\n";
+require 'config.php';
+require 'libraries/medoo/medoo.php';
+try {
+  $mdb = new medoo([
+    'database_type' => 'mysql',
+    'database_name' => $database['name'],
+    'server' => $database['host'],
+    'username' => $database['user'],
+    'password' => $database['password'],
+    'charset' => 'utf8'
+  ]);
+  echo "CONNECTED\n";
+  $cols = $mdb->query("SHOW COLUMNS FROM clients")->fetchAll(PDO::FETCH_ASSOC);
+  echo "COLUMNS=" . count($cols) . "\n";
+  foreach ($cols as $c) {
+    echo ($c['Field'] ?? '') . "\n";
+  }
+  $data = $mdb->query("SELECT id, name, active, COALESCE(google_ads_customer_id,'') AS google_ads_customer_id FROM clients ORDER BY id ASC")->fetchAll(PDO::FETCH_ASSOC);
+  echo "ROWS=" . count($data) . "\n";
+  foreach ($data as $r) {
+    echo json_encode($r, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES) . "\n";
+  }
+  $eligible = $mdb->query("SELECT id FROM clients WHERE COALESCE(deleted,0)=0 AND active=1 AND google_ads_customer_id IS NOT NULL AND google_ads_customer_id<>'' ORDER BY id ASC")->fetchAll(PDO::FETCH_COLUMN);
+  echo "ELIGIBLE=" . json_encode($eligible) . "\n";
+} catch (Throwable $e) {
+  echo "ERR: " . $e->getMessage() . "\n";
+}
+?>