feat: add_training_event with subcategory (#79) #311

Job	Run time
config-deploy	31s
backend-ci / backend-ci	1m 49s
build-db (localdev) / build-db	37s
build-kv (localdev) / build-kv	37s
build-db (production) / build-db	0s
build-db (staging) / build-db	35s
build-kv (production) / build-kv	0s
build-kv (staging) / build-kv	1m 12s
build-server (localdev) / build-server	1m 45s
build-server (production) / build-server	0s
build-server (staging) / build-server	45s
	7m 51s

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