Saving JSON to WordPress custom table

<script type="text/javascript">
	jQuery(document).ready(function ($) {
		$(".btn_schedule").click(function() {
			var selected_id = 1;
			var schedule = {"Monday":{"morning":"8:00 am","afternoon":"1:00 pm"},
							"Tuesday":{"morning":"8:00 am","afternoon":"1:00 pm"}};

			var myJSON = JSON.stringify(schedule);
			save_clinic_schedule(selected_id,myJSON);		
						
		});
		//ajax script to save JSON to Database
		function save_clinic_schedule(selected_id,schedule_container){
			$.ajax({
				type:"POST",
				data:{
					action:'save_clinic_schedule',
					selected_id:selected_id,
					schedule_container:schedule_container
				},
				url : myAjax.ajaxurl,
	            success:function(data)
	            {
	            	//alert your json if you want to verify it's working
	            	alert(data);
	            }
	        })
		}
	});
</script>

<?php
add_action('wp_ajax_save_clinic_schedule','save_clinic_schedule');
add_action('wp_ajax_nopriv_save_clinic_schedule','save_clinic_schedule');

function save_clinic_schedule(){
	// your selected table
	global $wpdb;
	$table = $wpdb->prefix . 'ohr_clinic';

	$data['schedule']      =  $_POST['schedule_container'];
	$clinic_id   =   $_POST['selected_id'];

	//to check if json is not empty will be used for alert later.
	echo $_POST['schedule_container'];

	$wpdb->update( $table, $data, array( 'clinic_id' => $clinic_id) );
	wp_die();
}