'Read in the timing data from the sqlite DB and save into a dict.'

def _read_timing_data(self):

    self.run_data = {}
    self.all_modulestore_combos = set()
    for row in self.all_rows:
        time_taken = row[3]
        desc_parts = row[2].split(':')
        modulestores = desc_parts[1]
        self.all_modulestore_combos.add(modulestores)
        amount_md = desc_parts[2]
        test_phase = 'all'
        if (len(desc_parts) > 3):
            test_phase = desc_parts[3]
        phase_data = self.run_data.setdefault(test_phase, {})
        amount_data = phase_data.setdefault(amount_md, {})
        __ = amount_data.setdefault(modulestores, time_taken)
