liquibase-core/src/main/java/liquibase/change/AbstractChange.java
@SuppressWarnings("UnusedParameters")
    protected String createSinceMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation) {
        if (changePropertyAnnotation == null) {
            return null;
        }
        return StringUtil.trimToNull(changePropertyAnnotation.since());
    }
@SuppressWarnings("UnusedParameters")
    protected String createSinceMetaData(String parameterName, DatabaseChangeProperty changePropertyAnnotation) {
        if (changePropertyAnnotation == null) {
            return null;
        }
        return StringUtil.trimToNull(changePropertyAnnotation.since());
    }
Create the {@link ChangeParameterMetaData} "since" value. Uses the value on the DatabaseChangeProperty
annotation or returns null as a default.