Google charts-mysql limit

[Οδυσσέας Συμεωνίδης]

Hi guys i have been uploading data to my mysql database for 2 months and recently noticed that the google charts that i have been making through the database have stopped updating.I searched the code for errors but nothing and i tried to delete old entries in the database (approximately a day worth of entries) and immediately the charts updated.Is there a limit of how many entries the chart could "see" ?