How should freezes be treated

[pendingintent]

• Once a freeze is creaetd, what does it represent?
• How can we use the functionality to create versions and `studyDesigns'
• These are then used in the diff reporting to generate a Impact Assessment

[pendingintent]

Refactor "freeze" to snapshot or version.

[pendingintent]

These 'versions' will correspond to amendments in the USDM JSON.

[StudyAmendment]
id: str = Field(min_length=1)
extensionAttributes: List[ExtensionAttribute] = [] <- not used at the moment
name: str = Field(min_length=1)
label: Union[str, None] = None
description: Union[str, None] = None
number: str
summary: str
primaryReason: StudyAmendmentReason
secondaryReasons: List[StudyAmendmentReason] = []
changes: List[StudyChange] = [] # Not in API
impacts: List[StudyAmendmentImpact] = []
geographicScopes: List[GeographicScope] <- not used at the moment
enrollments: List[SubjectEnrollment] = [] <- not used at the moment
dateValues: List[GovernanceDate] = [] <- not used at the moment
previousId: Union[str, None] = None
notes: List[CommentAnnotation] = [] <- not used at the moment
instanceType: Literal["StudyAmendment"]

[StudyAmendmentReason]
id: str = Field(min_length=1)
extensionAttributes: List[ExtensionAttribute] = [] <- not used at the moment
code: Code
otherReason: Union[str, None] = None
instanceType: Literal["StudyAmendmentReason"]

[StudyAmendmentImpact]
id: str = Field(min_length=1)
extensionAttributes: List[ExtensionAttribute] = [] <- not used at the moment
type: Code
text: str
isSubstantial: bool
notes: List[CommentAnnotation] = [] <- not used at the moment
instanceType: Literal["StudyAmendmentImpact"]

[StudyChange]
id: str = Field(min_length=1)
extensionAttributes: List[ExtensionAttribute] = []
name: str = Field(min_length=1)
label: Union[str, None] = None
description: Union[str, None] = None
summary: str
rationale: str
changedSections: List[DocumentContentReference]
instanceType: Literal["StudyChange"]

[pendingintent]

For the first iteration of amendments, do not include the [StudyChange] class. This would be too granular.