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    Type:Sub-task 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: backend
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        Not defined
Context:
See parent ticket OPT-3085
AT:
- the alert threshold can be defined as a rational number
- it's tested that users can create alerts for variable aggregation reports
- there's a migration step to make sure that old alerts are moved to the new structure.