add created_at and updated_at to the user management table
add created_at and updated_at to the user management table

HITS-SDBV/seek,Virtual-Liver-Network/seek,aina1205/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,Virtual-Liver-Network/seek,stuzart/seek,HITS-SDBV/seek,HITS-SDBV/seek,SynthSys/seek,aina1205/nmtrypi-seek,stuzart/seek,stuzart/seek,SynthSys/seek,Virtual-Liver-Network/seek,HITS-SDBV/nmtrypi-seek,HITS-SDBV/seek,HITS-SDBV/nmtrypi-seek,aina1205/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,Virtual-Liver-Network/seek,SynthSys/seek,aina1205/nmtrypi-seek,SynthSys/seek