diff --git a/src/main/resources/db/changelog-20190430_000000-schema.xml b/src/main/resources/db/changelog-20190430_000000-schema.xml
new file mode 100644
index 0000000..58a3bc5
--- /dev/null
+++ b/src/main/resources/db/changelog-20190430_000000-schema.xml
@@ -0,0 +1,11 @@
+<?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="tanya" id="20190430_000000-1">
+        <dropColumn columnName="file_id" tableName="grants"/>
+        <addColumn tableName="file">
+            <column name="grant_id" type="integer"/>
+        </addColumn>
+    </changeSet>
+</databaseChangeLog>
diff --git a/src/main/resources/db/changelog-master.xml b/src/main/resources/db/changelog-master.xml
index 68b294a..42d33d7 100644
--- a/src/main/resources/db/changelog-master.xml
+++ b/src/main/resources/db/changelog-master.xml
@@ -34,4 +34,5 @@
     <include file="db/changelog-20190421_000000-schema.xml"/>
     <include file="db/changelog-20190422_000000-schema.xml"/>
     <include file="db/changelog-20190424_000000-schema.xml"/>
+    <include file="db/changelog-20190430_000000-schema.xml"/>
 </databaseChangeLog>
\ No newline at end of file