Add soft deletes via status column

- Add status ENUM('active','disabled','deleted') to 8 tables
- Change all physical DELETE to UPDATE status='deleted'
- All SELECT queries filter by status='active'
- toggleActive now alternates between active/disabled status
- Exceptions: monitoring_history, rate_limits, sessions keep physical purge
- audit_logs remains immutable

src/Models/User.php

@@ -20,17 +20,17 @@ class User
 
     public function findById(int $id): ?array
     {
-        return $this->db->fetch('SELECT * FROM users WHERE id = ?', [$id]);
+        return $this->db->fetch('SELECT * FROM users WHERE id = ? AND status = \'active\'', [$id]);
     }
 
     public function findByUsername(string $username): ?array
     {
-        return $this->db->fetch('SELECT * FROM users WHERE username = ?', [$username]);
+        return $this->db->fetch('SELECT * FROM users WHERE username = ? AND status = \'active\'', [$username]);
     }
 
     public function findByEmail(string $email): ?array
     {
-        return $this->db->fetch('SELECT * FROM users WHERE email = ?', [$email]);
+        return $this->db->fetch('SELECT * FROM users WHERE email = ? AND status = \'active\'', [$email]);
     }
 
     public function authenticate(string $username, string $password): ?array
@@ -41,7 +41,7 @@ class User
             return null;
         }
 
-        if (!$user['is_active']) {
+        if ($user['status'] !== 'active' || !$user['is_active']) {
             return null;
         }
 
@@ -83,17 +83,21 @@ class User
 
     public function delete(int $id): bool
     {
-        return $this->db->delete('users', 'id = ?', [$id]) > 0;
+        return $this->db->update('users', [
+            'status' => 'deleted',
+            'is_active' => 0,
+            'updated_at' => date('Y-m-d H:i:s'),
+        ], 'id = ?', [$id]) > 0;
     }
 
     public function getAll(int $page = 1, int $perPage = 20): array
     {
         $offset = ($page - 1) * $perPage;
 
-        $total = $this->db->fetch("SELECT COUNT(*) as total FROM users");
+        $total = $this->db->fetch("SELECT COUNT(*) as total FROM users WHERE status = 'active'");
         $users = $this->db->fetchAll(
-            'SELECT id, username, email, role, is_active, last_login_at, created_at 
-             FROM users ORDER BY created_at DESC LIMIT ? OFFSET ?',
+            'SELECT id, username, email, role, status, is_active, last_login_at, created_at 
+             FROM users WHERE status = \'active\' ORDER BY created_at DESC LIMIT ? OFFSET ?',
             [$perPage, $offset]
         );
 
@@ -108,7 +112,7 @@ class User
 
     public function findByApiToken(string $token): ?array
     {
-        return $this->db->fetch('SELECT * FROM users WHERE api_token = ? AND is_active = 1', [$token]);
+        return $this->db->fetch('SELECT * FROM users WHERE api_token = ? AND status = \'active\' AND is_active = 1', [$token]);
     }
 
     public function updateLastLogin(int $id): void
@@ -118,7 +122,7 @@ class User
 
     public function countAll(): int
     {
-        $result = $this->db->fetch("SELECT COUNT(*) as total FROM users");
+        $result = $this->db->fetch("SELECT COUNT(*) as total FROM users WHERE status = 'active'");
         return (int) ($result['total'] ?? 0);
     }
 }