Resolve "Rendered yaml is too long"

As in, https://github.com/steemit/sbds/issues/63, modifies the rendered_yaml to accept longer objects (up to 16MB with MEDIUMTEXT).

Created to solve #41 (closed)

src/LbAnalysisProductions/models/production.py

@@ -147,12 +147,12 @@ class Production(Base):
     id = Column(Integer, primary_key=True)
     # Columns
     name = Column(String(256), nullable=False)
-    yaml = deferred(Column(UnicodeText, nullable=False))
 
     # To save long rendered yaml files
     UT_long = UnicodeText()
     UT_long = UT_long.with_variant(mysql.MEDIUMTEXT, "mysql")
 
+    yaml = deferred(Column(UT_long, nullable=False))
     rendered_yaml = deferred(Column(UT_long, nullable=False))
 
     # Relationships