Extend set of forbidden fields to include keywords from various database backends

[Cindy0113]

Issue location: /dynamic_models/models.py:254
That is:

class ModelFieldSchema(GenericModel, GenericField):
objects = ModelFieldSchemaManager()
null = models.BooleanField(default=False) # issue1
unique = models.BooleanField(default=False) # issue2
max_length = models.PositiveIntegerField(null=True)

Problem description:

'null' and 'unique' are keywords in mysql grammar.
In our strict DBA system, 'null' and 'unique' are forbidden to be column names.

Suggestion:
code to be modified as follows.

class ModelFieldSchema(GenericModel, GenericField):
objects = ModelFieldSchemaManager()
null = models.BooleanField(default=False, db_column='is_null') # issue1
unique = models.BooleanField(default=False, db_column='is_unique') # issue2
max_length = models.PositiveIntegerField(null=True)

[rvinzent]

@Cindy0113 Finally following up on this...

I was thinking about programmatically calling into Django's system checks framework to perform many other checks on model errors and warnings. Does this handle your use case?