diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/WebserviceConfig.java b/src/main/java/ch/ethz/seb/sebserver/webservice/WebserviceConfig.java
index 7952243e..febe709a 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/WebserviceConfig.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/WebserviceConfig.java
@@ -11,6 +11,7 @@ package ch.ethz.seb.sebserver.webservice;
 import org.cryptonode.jncryptor.AES256JNCryptor;
 import org.cryptonode.jncryptor.JNCryptor;
 import org.flywaydb.core.Flyway;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.autoconfigure.flyway.FlywayMigrationStrategy;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -24,6 +25,9 @@ import ch.ethz.seb.sebserver.gbl.profile.WebServiceProfile;
 @WebServiceProfile
 public class WebserviceConfig {
 
+    @Value("${sebserver.webservice.clean-db-on-startup:false}")
+    boolean cleanDBOnStartup;
+
     @Lazy
     @Bean
     public JNCryptor jnCryptor() {
@@ -42,7 +46,9 @@ public class WebserviceConfig {
         final FlywayMigrationStrategy strategy = new FlywayMigrationStrategy() {
             @Override
             public void migrate(final Flyway flyway) {
-                flyway.clean();
+                if (WebserviceConfig.this.cleanDBOnStartup) {
+                    flyway.clean();
+                }
                 flyway.migrate();
             }
         };
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/PaginationService.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/PaginationService.java
index 6bad52a1..8799ab75 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/PaginationService.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/PaginationService.java
@@ -53,7 +53,15 @@ public interface PaginationService {
 
     /** Get a Page of specified domain models from given pagination attributes within collection supplier delegate.
      *
-     *
+     * NOTE: Paging always depends on SQL level. It depends on the collection given by the SQL select statement
+     * that is executed within MyBatis by using the MyBatis page service.
+     * Be aware that if the delegate that is given here applies an additional filter to the filtering done
+     * on SQL level, this will lead to paging with not fully filled pages or even to empty pages if the filter
+     * filters a lot of the entries given by the SQL statement away.
+     * So we recommend to apply as much of the filtering as possible on the SQL level and only if necessary and
+     * not avoidable, apply a additional filter on software-level that eventually filter one or two entities
+     * for a page.
+     * 
      * @param pageNumber the current page number
      * @param pageSize the (full) size of the page
      * @param sort the name of the sort column with a leading '-' for descending sort order
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/UserActivityLogDAOImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/UserActivityLogDAOImpl.java
index 98d586c9..48ca1015 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/UserActivityLogDAOImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/impl/UserActivityLogDAOImpl.java
@@ -294,7 +294,7 @@ public class UserActivityLogDAOImpl implements UserActivityLogDAO {
 
         return all(
                 filterMap.getInstitutionId(),
-                filterMap.getString(UserActivityLog.FILTER_ATTR_USER_NAME),
+                filterMap.getSQLWildcard(UserActivityLog.FILTER_ATTR_USER_NAME),
                 filterMap.getUserLogFrom(),
                 filterMap.getUserLofTo(),
                 filterMap.getString(UserActivityLog.FILTER_ATTR_ACTIVITY_TYPES),
@@ -321,14 +321,6 @@ public class UserActivityLogDAOImpl implements UserActivityLogDAO {
                     ? Arrays.asList(StringUtils.split(entityTypes, Constants.LIST_SEPARATOR))
                     : null;
 
-            Predicate<UserActivityLog> _predicate = (predicate != null)
-                    ? predicate
-                    : model -> true;
-
-            if (StringUtils.isNotBlank(userName)) {
-                _predicate = _predicate.and(model -> model.getUsername().contains(userName));
-            }
-
             final List<UserActivityLogRecord> records = this.userLogRecordMapper
                     .selectByExample()
                     .leftJoin(UserRecordDynamicSqlSupport.userRecord)
@@ -338,6 +330,9 @@ public class UserActivityLogDAOImpl implements UserActivityLogDAO {
                     .where(
                             UserRecordDynamicSqlSupport.institutionId,
                             SqlBuilder.isEqualToWhenPresent(institutionId))
+                    .and(
+                            UserRecordDynamicSqlSupport.username,
+                            SqlBuilder.isLikeWhenPresent(userName))
                     .and(
                             UserActivityLogRecordDynamicSqlSupport.timestamp,
                             SqlBuilder.isGreaterThanOrEqualToWhenPresent(from))
@@ -355,7 +350,7 @@ public class UserActivityLogDAOImpl implements UserActivityLogDAO {
 
             return this.toDomainModel(institutionId, records)
                     .stream()
-                    .filter(_predicate)
+                    .filter(predicate)
                     .collect(Collectors.toList());
         });
     }
diff --git a/src/main/resources/config/application-dev-ws.properties b/src/main/resources/config/application-dev-ws.properties
index 5ec2c44f..5f63b1b0 100644
--- a/src/main/resources/config/application-dev-ws.properties
+++ b/src/main/resources/config/application-dev-ws.properties
@@ -10,7 +10,7 @@ spring.datasource.url=jdbc:mariadb://localhost:3306/SEBServer?createDatabaseIfNo
 spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
 spring.flyway.enabled=true
 spring.flyway.locations=classpath:config/sql/base,classpath:config/sql/dev
-spring.flyway.baselineOnMigrate=true
+spring.flyway.cleanDisabled=false
 spring.datasource.hikari.initializationFailTimeout=30000
 spring.datasource.hikari.connectionTimeout=30000
 spring.datasource.hikari.idleTimeout=600000
@@ -20,6 +20,8 @@ sebserver.http.client.connect-timeout=15000
 sebserver.http.client.connection-request-timeout=10000
 sebserver.http.client.read-timeout=20000
 
+sebserver.webservice.clean-db-on-startup=false
+
 # webservice configuration
 sebserver.init.adminaccount.gen-on-init=false
 sebserver.webservice.distributed=false
diff --git a/src/main/resources/config/application.properties b/src/main/resources/config/application.properties
index abc6595c..54584a1c 100644
--- a/src/main/resources/config/application.properties
+++ b/src/main/resources/config/application.properties
@@ -72,6 +72,7 @@ spring.datasource.initialization-mode=always
 spring.datasource.url=jdbc:mariadb://${datastore.mariadb.server.address}:${datastore.mariadb.server.port}/SEBServer?useSSL=false&createDatabaseIfNotExist=true
 spring.flyway.enabled=true
 spring.flyway.locations=classpath:config/sql/base
+spring.flyway.cleanDisabled=true
 spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
 spring.datasource.hikari.initializationFailTimeout=3000
 spring.datasource.hikari.connectionTimeout=30000