diff --git a/Migration.md b/Migration.md
index 870c6db..05f391e 100644
--- a/Migration.md
+++ b/Migration.md
@@ -23,3 +23,33 @@ cd
 export GITEA_WORK_DIR=/var/lib/gitea
 /nix/store/*-gitea-1.15.2/bin/gitea doctor --all
 ```
+
+#### Fix problems caused by database schema changes between Gitea 1.8.3 and 1.15.2
+
+2 Factor Auth didn't work, but was only used by 2 users anyway. We delete the old settings:
+
+```sql
+delete from two_factor;
+```
+
+There is a new column `repository.owner_name` that needs be set. Otherwise the web frontend displayed links starting with `//`.
+
+Before fixing, we checked the `owner_names` queried by joining via `"user".id = repo.owner_id`:
+
+```sql
+select "user".lower_name, repo.owner_name, repo.lower_name from repository as repo inner join "user" on "user".id = repo.owner_id;
+```
+
+```sql
+UPDATE repository
+SET owner_name = map.name
+FROM (SELECT "user".lower_name AS name, repository.owner_id AS id
+      FROM repository INNER JOIN "user" ON "user".id = repository.owner_id
+     ) AS map
+WHERE map.id = repository.owner_id;
+```
+
+#### Problems with old logins
+
+Till now `PASSWORD_HASH_ALGO` `argon2` was used, but seems not to work in the new version.
+Using the password recovery works.
diff --git a/migrate.sh b/migrate.sh
index 547f6b0..1591f18 100755
--- a/migrate.sh
+++ b/migrate.sh
@@ -6,6 +6,7 @@ DATABASE=gitea
 
 cd /tmp/
 unzip ${DUMP}.zip
+unzip gitea-repo.zip
 
 systemctl stop gitea
 
diff --git a/modules/gitea.nix b/modules/gitea.nix
index 251d022..d22a8fe 100644
--- a/modules/gitea.nix
+++ b/modules/gitea.nix
@@ -40,6 +40,11 @@
         HOST = "mail.c3d2.de:465";
         IS_TLS_ENABLED = true;
       };
+      service = {
+        NO_REPLY_ADDRESS = "no_reply@c3d2.de";
+        REGISTER_EMAIL_CONFIRM = true;
+        ENABLE_NOTIFY_MAIL = true;
+      };
     };
   };