add visibility conditions to the announcement messages and refactor #369

Job	Run time
build (mysql, 3.9)	1m 41s
build (mysql, 3.11)	1m 29s
build (postgres, 3.9)	1m 42s
build (postgres, 3.11)	1m 23s
Indicate completion to coveralls	0s
	6m 15s

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