some updates

src/main/resources/dbmigration/1.5.sql

@@ -0,0 +1,2 @@
+-- apply alter tables
+alter table document add column if not exists ref_id_of_doc bigint;

src/main/resources/dbmigration/model/1.5.model.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<migration xmlns="http://ebean-orm.github.io/xml/ns/dbmigration">
+    <changeSet type="apply">
+        <addColumn tableName="document">
+            <column name="ref_id_of_doc" type="bigint"/>
+        </addColumn>
+    </changeSet>
+    <changeSet type="pendingDrops">
+        <dropColumn columnName="ref_id" tableName="document"/>
+    </changeSet>
+</migration>

src/main/resources/logback.xml

@@ -1,4 +1,19 @@
 <configuration>
+    <appender name="ROLLING" class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>api.log</file>
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <FileNamePattern>api.%d{yyyy-MM-dd}.%i.log.gz</FileNamePattern>
+            <MaxHistory>30</MaxHistory>
+            <timeBasedFileNamingAndTriggeringPolicy
+                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
+                <maxFileSize>100MB</maxFileSize>
+            </timeBasedFileNamingAndTriggeringPolicy>
+        </rollingPolicy>
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
     <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
             <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
@@ -14,5 +29,6 @@
 
     <root level="info">
         <appender-ref ref="STDOUT" />
+        <appender-ref ref="ROLLING" />
     </root>
 </configuration>