fix: #2883 pickle data was truncated error in database session using MySql#2884

Lin-Nikaido wants to merge 3 commits intogoogle:maingoogle/adk-python:mainfrom

Lin-Nikaido:fix/#2883-mysql-datatype-fixLin-Nikaido/adk-python:fix/#2883-mysql-datatype-fixCopy head branch name to clipboard