Thanks again Arnar,

I'm sorry for my stupidity and for the time that you loose for me.
But I'm going crazy to understand everything. My brain is in overeating
state ;-)) Speaking in sqlAlchemy code:

> 
> rules.. you should keep a table of days (with cols year, month, day) -
> but since this is an easily recreatable dataset, no table is really
> neccessary here.

days=Table('days', metadata,
 Column('days_id', Integer, primary_key=True),
 Column('year', Integer),
 Column('month', Integer),
 Column('day', Integer))

instrument=Table('instruments', metadata,
 Column('instrument_id', Integer, primary_key=True),
 Column('name', String))
> 

planning=Table('planning', metadata,
 Column('planning_id', Integer, primary_key=True),
 Column('instrument_id', Integer,ForeignKey('instruments.instrument_id')),
 Column('days_id', Integer, ForeignKey('days.days_id')),
 Column('data', String))

I've already loose the way....

class Days(object): pass
class Instrument(object): pass
class Planning(object): pass

mapper(Days, days)
mapper(Instruments, instruments)
mapper(Planning, planning,
        properties={ 'instruments' :relation(Instruments),
                     'days' : relation(Days)})

I think to be out of brain.

Please, if you can help me I offer you a wonderful coffee if you come to
Florence.

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