Each Commit has, in addition to the usual "attributes of Arvados resources":resources.html:
table(table table-bordered table-condensed).
-|*Property name*|*Value*|*Description*|*Example*|
-|id|integer|||
+|*Attribute*|*Type*|*Description*|*Example*|
|repository_name|string|||
|sha1|string|||
|message|string|||
-|created_at|datetime|||
|updated_at|datetime|||