Enhance bot functionality and refactor database interactions

- Added `ca-certificates` installation to Dockerfile for improved network security.
- Updated health check command in Dockerfile to include better timeout handling.
- Refactored `run_helper.py` to implement proper signal handling and logging during shutdown.
- Transitioned database operations to an asynchronous model in `async_db.py`, improving performance and responsiveness.
- Updated database schema to support new foreign key relationships and optimized indexing for better query performance.
- Enhanced various bot handlers to utilize async database methods, improving overall efficiency and user experience.
- Removed obsolete database and fix scripts to streamline the project structure.

database/repositories/admin_repository.py

@@ -0,0 +1,74 @@
+from typing import Optional
+from database.base import DatabaseConnection
+from database.models import Admin
+
+
+class AdminRepository(DatabaseConnection):
+    """Репозиторий для работы с администраторами."""
+    
+    async def create_tables(self):
+        """Создание таблицы администраторов."""
+        # Включаем поддержку внешних ключей
+        await self._execute_query("PRAGMA foreign_keys = ON")
+        
+        query = '''
+            CREATE TABLE IF NOT EXISTS admins (
+                user_id INTEGER NOT NULL PRIMARY KEY,
+                role TEXT DEFAULT 'admin',
+                created_at INTEGER DEFAULT (strftime('%s', 'now')),
+                FOREIGN KEY (user_id) REFERENCES our_users (user_id) ON DELETE CASCADE
+            )
+        '''
+        await self._execute_query(query)
+        self.logger.info("Таблица администраторов создана")
+    
+    async def add_admin(self, admin: Admin) -> None:
+        """Добавление администратора."""
+        query = "INSERT INTO admins (user_id, role) VALUES (?, ?)"
+        params = (admin.user_id, admin.role)
+        
+        await self._execute_query(query, params)
+        self.logger.info(f"Администратор добавлен: user_id={admin.user_id}, role={admin.role}")
+    
+    async def remove_admin(self, user_id: int) -> None:
+        """Удаление администратора."""
+        query = "DELETE FROM admins WHERE user_id = ?"
+        await self._execute_query(query, (user_id,))
+        self.logger.info(f"Администратор удален: user_id={user_id}")
+    
+    async def is_admin(self, user_id: int) -> bool:
+        """Проверка, является ли пользователь администратором."""
+        query = "SELECT 1 FROM admins WHERE user_id = ?"
+        rows = await self._execute_query_with_result(query, (user_id,))
+        row = rows[0] if rows else None
+        return bool(row)
+    
+    async def get_admin(self, user_id: int) -> Optional[Admin]:
+        """Получение информации об администраторе."""
+        query = "SELECT user_id, role, created_at FROM admins WHERE user_id = ?"
+        rows = await self._execute_query_with_result(query, (user_id,))
+        row = rows[0] if rows else None
+        
+        if row:
+            return Admin(
+                user_id=row[0],
+                role=row[1],
+                created_at=row[2] if len(row) > 2 else None
+            )
+        return None
+    
+    async def get_all_admins(self) -> list[Admin]:
+        """Получение всех администраторов."""
+        query = "SELECT user_id, role, created_at FROM admins ORDER BY created_at DESC"
+        rows = await self._execute_query_with_result(query)
+        
+        admins = []
+        for row in rows:
+            admin = Admin(
+                user_id=row[0],
+                role=row[1],
+                created_at=row[2] if len(row) > 2 else None
+            )
+            admins.append(admin)
+        
+        return admins