Bad datetime value leads to unexpected server error

Summary

In [1]: import linkahead as db

In [2]: r = db.Record().add_parent("Event").add_property(id=6040,value="06:21:25").insert()

Expected Behavior

Proper error message

Actual Behavior

Unexpected server error without clear information

Steps to Reproduce the Problem

see code above

Specifications

Version: 0.12.2

Possible fixes

NA

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