diff --git a/roles/mailserver_database/files/tables.sql b/roles/mailserver_database/files/tables.sql
index 5c3eacb..4e120f0 100644
--- a/roles/mailserver_database/files/tables.sql
+++ b/roles/mailserver_database/files/tables.sql
@@ -1,23 +1,29 @@
 CREATE TABLE IF NOT EXISTS virtual_domains (
     id integer primary key generated by default as identity,
-    name varchar(50) NOT NULL
+    name varchar(50) NOT NULL UNIQUE
 );
+INSERT INTO virtual_domains (name) VALUES ('tunuifranken.info') ON CONFLICT (name) DO NOTHING;
 
 CREATE TABLE IF NOT EXISTS virtual_users (
     id integer primary key generated by default as identity,
     domain_id integer NOT NULL,
-    email varchar(254) NOT NULL,
+    email varchar(254) NOT NULL UNIQUE,
     password varchar(150) NOT NULL,
     quota bigint NOT NULL DEFAULT 0,
-    UNIQUE (email),
     FOREIGN KEY (domain_id) REFERENCES virtual_domains(id)
     ON DELETE CASCADE
 );
+INSERT INTO virtual_users (domain_id, email, password, quota) VALUES (
+    (SELECT id FROM virtual_domains WHERE name = 'tunuifranken.info'),
+    'abuse@tunuifranken.info',
+    'foo',
+    0
+) ON CONFLICT (email) DO UPDATE SET password = EXCLUDED.password, quota = EXCLUDED.quota;
 
 CREATE TABLE IF NOT EXISTS virtual_aliases (
     id integer primary key generated by default as identity,
     domain_id integer NOT NULL,
-    source varchar(254) NOT NULL,
+    source varchar(254) NOT NULL UNIQUE,
     destination varchar(254) NOT NULL,
     FOREIGN KEY (domain_id) REFERENCES virtual_domains(id)
     ON DELETE CASCADE