Revert "Revert "Update cassandra schema with correct type for message's parent_id field.""
Revert "Revert "Update cassandra schema with correct type for message's parent_id field.""

This reverts commit 1e7eb49

CaliOpen/deploy-alpha,CaliOpen/deploy-alpha,CaliOpen/deploy-alpha,CaliOpen/deploy-alpha,CaliOpen/deploy-alpha