[web2py] when I open a second DAL connection to the same sqlite database it does not detect a new table

[simon]

*In the following code I create a new table in db1. However when I open a 
second DAL connection to the same database the new table is not shown. Why 
is that?*
*
*
*db1 = DAL('sqlite://storage.sqlite', folder=dbfolder, auto_import=True)*
*print(db1.tables)*
*
*
*db1.executesql("DROP TABLE IF EXISTS test;")*
*print(db1._timings)*
*try:*
*    os.remove(dbfolder+"/test.table")*
*except:*
*    pass*
*    *
*db1.define_table('test', Field('testfield'), migrate='test.table')*
*db1.commit()*
*print(db1.tables)*
*
*
*db2 = DAL('sqlite://storage.sqlite', folder=dbfolder, auto_import=True)*
*print(db2.tables)*