code: def sql(self):
          
          from fasta.indexed import DatabaseFASTA, fasta_to_sql
          db = DatabaseFASTA(self.prefix_path + ".db")
          if not db.exists: fasta_to_sql(self.path, db.path)
          return db
docs: If you access this attribute, we will build an SQLite database
          out of the FASTA file and you will be able access everything in an
          indexed fashion, and use the blaze library via sql.frame