Fix reggression, save not activated repos to database on sync again (#510)

* Fix #508
* Add testcase

Unrelated nits:
* Rm one index (unique will already create an index)
* Do not drop  on UpdateUser

server/api/user.go

@@ -93,7 +93,10 @@ func GetRepos(c *gin.Context) {
 	if flush || time.Unix(user.Synced, 0).Add(time.Hour*72).Before(time.Now()) {
 		log.Debug().Msgf("sync begin: %s", user.Login)
 		user.Synced = time.Now().Unix()
-		store_.UpdateUser(user)
+		if err := store_.UpdateUser(user); err != nil {
+			log.Err(err).Msgf("update user '%s'", user.Login)
+			return
+		}
 
 		config := ToConfig(c)