diff --git a/src/main/java/ru/ulstu/user/error/UserBlockedException.java b/src/main/java/ru/ulstu/user/error/UserBlockedException.java
new file mode 100644
index 0000000..6de97e9
--- /dev/null
+++ b/src/main/java/ru/ulstu/user/error/UserBlockedException.java
@@ -0,0 +1,7 @@
+package ru.ulstu.user.error;
+
+public class UserBlockedException extends RuntimeException {
+    public UserBlockedException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/resources/db/changelog-20190531_000002-schema.xml b/src/main/resources/db/changelog-20190531_000002-schema.xml
new file mode 100644
index 0000000..9531c87
--- /dev/null
+++ b/src/main/resources/db/changelog-20190531_000002-schema.xml
@@ -0,0 +1,12 @@
+<?xml version="1.1" encoding="UTF-8" standalone="no"?>
+<databaseChangeLog xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                   xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
+    <changeSet author="arefyev" id="20190528_000000-3">
+        <addColumn tableName="users">
+            <column name="blocker_id" type="integer"/>
+        </addColumn>
+        <addForeignKeyConstraint baseTableName="users" baseColumnNames="blocker_id" constraintName="fk_blocker"
+                                 referencedTableName="users" referencedColumnNames="id"/>
+    </changeSet>
+</databaseChangeLog>