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+ Initial adjustments for support django 1.11 93
+ Add DatabaseOperations.time_trunc_sql() to support TimeField truncation 87
+ Add DatabaseOperations.datetime_cast_time_sql() to support time lookup 88
+ DatabaseIntrospection.get_constraints() enhanced due a get_indexes() deprecation 89
+ DatabaseIntrospection.get_constraints() method should include an 'orders' key 90
+ NameError: global name '_is_relevant_relation' is not defined 99
* Improvements in schema migration