diff --git a/src/main/resources/db/migration/postgresql/V8_1__Set_null_to_links.sql b/src/main/resources/db/migration/postgresql/V8_1__Set_null_to_links.sql
new file mode 100644
index 0000000..ad59f62
--- /dev/null
+++ b/src/main/resources/db/migration/postgresql/V8_1__Set_null_to_links.sql
@@ -0,0 +1 @@
+update players set bis_link = null where bis_link = '';
\ No newline at end of file
diff --git a/src/main/resources/logback.xml b/src/main/resources/logback.xml
index 818cea7..c83b012 100644
--- a/src/main/resources/logback.xml
+++ b/src/main/resources/logback.xml
@@ -12,5 +12,6 @@
     </logger>
     <logger name="org.flywaydb.core.internal" level="INFO" />
     <logger name="com.zaxxer.hikari.pool" level="INFO" />
+    <logger name="io.swagger" level="INFO" />
 
 </configuration>