-- after Deploy 0 (Stage 1 / Stage 1) --
{"appStage":1,"columns":["ID","NAME","EMAIL","CREATED_AT"],"rowCount":0,"rowsWithEmail":0}

-- after Deploy 1 (schema expanded, both replicas still Stage 1) --
{"appStage":1,"columns":["ID","NAME","EMAIL","CREATED_AT","EMAIL_ADDRESS"],"rowCount":1212,"rowsWithEmail":1212,"rowsWithEmailAddress":1184}

-- after Deploy 2 (both replicas Stage 2, dual-write live) --
{"appStage":2,"columns":["ID","NAME","EMAIL","CREATED_AT","EMAIL_ADDRESS"],"rowCount":4218,"rowsWithEmail":4218,"rowsWithEmailAddress":2561}

-- after Deploy 3 (both replicas Stage 3, reading email_address) --
{"appStage":3,"columns":["ID","NAME","EMAIL","CREATED_AT","EMAIL_ADDRESS"],"rowCount":7547,"rowsWithEmail":7547,"rowsWithEmailAddress":6115}

-- after Deploy 4a (both replicas Stage 4, email column still present but unused) --
{"appStage":4,"columns":["ID","NAME","EMAIL","CREATED_AT","EMAIL_ADDRESS"],"rowCount":10642,"rowsWithEmail":9653,"rowsWithEmailAddress":9212}

-- after Deploy 4b (email column dropped) --
{"appStage":4,"columns":["ID","NAME","CREATED_AT","EMAIL_ADDRESS"],"rowCount":11806,"rowsWithEmailAddress":10374}