All generic repository with sqlite.net

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Threading.Tasks;
using MvvmCross.Plugins.Sqlite;

namespace ****.Repositories
{
    public interface IRepository<T>
    {
        Task<bool> InsertItem(T item);
        Task<bool> InsertItems(IEnumerable<T> items);
        Task<IEnumerable<T>> GetAllItems();
        Task<T> GetItem(string pk);
        Task<T> GetItem(Expression<Func<T, bool>> predicate);
        Task<IEnumerable<T>> FindItems(Expression<Func<T, bool>> predicate);
        Task<bool> AddItem(T item);
        Task<bool> UpdateItem(T item);
        Task<bool> DeleteItem(T item);
    }
    
    public class BaseRepository<T> : IRepository<T> where T : class, new()
    {
        private readonly IMvxSqliteConnectionFactory _sqliteConnectionFactory;
        private readonly string _databaseName;

        public BaseRepository(IMvxSqliteConnectionFactory sqliteConnectionFactory, string databaseName)
        {
            _sqliteConnectionFactory = sqliteConnectionFactory;
            _databaseName = databaseName;

            using (var con = _sqliteConnectionFactory.GetConnection(_databaseName))
            {
                con.CreateTable<T>();
            }
        }

        public async Task<bool> AddItem(T item)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return isSucces(await connection.InsertAsync(item));
        }

        public async Task<bool> DeleteItem(T item)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return isSucces(await connection.DeleteAsync(item));
        }

        public async Task<IEnumerable<T>> FindItems(Expression<Func<T, bool>> predicate)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return await connection.Table<T>().Where(predicate).ToListAsync();
        }

        public async Task<IEnumerable<T>> GetAllItems()
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return await connection.Table<T>().ToListAsync();
        }

        public async Task<T> GetItem(string pk)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return await connection.GetAsync<T>(pk);
        }

        public async Task<T> GetItem(Expression<Func<T, bool>> predicate)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return await connection.GetAsync<T>(predicate);
        }

        public async Task<bool> InsertItem(T item)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return isSucces(await connection.InsertAsync(item));
        }

        public async Task<bool> InsertItems(IEnumerable<T> items)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            foreach (T item in items)
            {
                await connection.InsertAsync(item);
            }
            return true;
        }

        public async Task<bool> UpdateItem(T item)
        {
            var connection = _sqliteConnectionFactory.GetAsyncConnection(_databaseName);
            return isSucces(await connection.InsertOrReplaceAsync(item));
        }

        private bool isSucces(int rowsAffected)
        {
            if (rowsAffected > 0)
                return true;
            return false;
        }
    }
}

How can i use for composite primary key table?