Add prices for lower quantities (500-999L)

Don't forget to run the migratedb command

models.py

@@ -35,8 +35,27 @@ class Price(BaseModel):
     id = AutoField()
     date = DateField(unique=True)
     price = IntegerField()
+    price500 = IntegerField()
 
 
 def init():
     db.connect()
     db.create_tables([Price])
+
+
+def migrate_001():
+    backend = conf["db"].get("backend", None)
+    if backend == "sqlite":
+        from playhouse.migrate import SqliteMigrator
+
+        migrator = SqliteMigrator(db)
+    elif backend == "mysql":
+        from playhouse.migrate import MySQLMigrator
+
+        migrator = MysqlMigrator(db)
+
+    from playhouse.migrate import migrate
+
+    price500_field = IntegerField(null=True)
+    with db.atomic():
+        migrate(migrator.add_column("price", "price500", price500_field))