Continue to implement opinion

improve target reference
Improve Tests for Opinion
fix SQL:upsert_opinion

src/test/kotlin/MailerTest.kt

@@ -7,6 +7,7 @@ import fr.dcproject.module
 import io.ktor.locations.KtorExperimentalLocationsAPI
 import io.ktor.server.testing.withTestApplication
 import io.ktor.util.KtorExperimentalAPI
+import org.junit.jupiter.api.Tag
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
 import org.koin.test.AutoCloseKoinTest
@@ -18,6 +19,7 @@ import org.koin.test.get
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class MailerTest : KoinTest, AutoCloseKoinTest() {
     @Test
+    @Tag("online")
     fun `can be send an email`() {
         withTestApplication({ module(Env.TEST) }) {
             get<Mailer>().sendEmail {