diff --git a/fda-container-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java b/fda-container-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
index 786f63a224b4e979d82bb4d8eec4ce448ca1f30a..d7bac1438f185a1064d86896f733ff753f6284c6 100644
--- a/fda-container-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
+++ b/fda-container-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
@@ -32,33 +32,38 @@ public abstract class BaseUnitTest {
     public final static String IMAGE_1_LOGO = "AAAA";
     public final static Instant IMAGE_1_BUILT = Instant.now().minus(40, HOURS);
     public final static List<ContainerImageEnvironmentItem> IMAGE_1_ENV = List.of(ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .key("MARIADB_USER")
                     .value("mariadb")
                     .type(ContainerImageEnvironmentItemType.OTHER)
                     .build(),
             ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .key("MARIADB_PASSWORD")
                     .value("mariadb")
                     .type(ContainerImageEnvironmentItemType.OTHER)
                     .build(),
             ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .key("MARIADB_ROOT_PASSWORD")
                     .value("mariadb")
                     .type(ContainerImageEnvironmentItemType.PASSWORD)
                     .build());
     public final static ImageEnvItemDto[] IMAGE_1_ENV_DTO = List.of(ImageEnvItemDto.builder()
-                    .key("POSTGRES_USER")
-                    .value("postgres")
+                            .iid(IMAGE_1_ID)
+                    .key("MARIADB_USER")
+                    .value("mariadb")
                     .type(ImageEnvItemTypeDto.USERNAME)
                     .build(),
             ImageEnvItemDto.builder()
-                    .key("POSTGRES_PASSWORD")
-                    .value("postgres")
+                    .iid(IMAGE_1_ID)
+                    .key("MARIADB_PASSWORD")
+                    .value("mariadb")
                     .type(ImageEnvItemTypeDto.PASSWORD)
                     .build())
             .toArray(new ImageEnvItemDto[0]);
-    public final static List<String> IMAGE_1_ENVIRONMENT = List.of("POSTGRES_USER=postgres",
-            "POSTGRES_PASSWORD=postgres");
+    public final static List<String> IMAGE_1_ENVIRONMENT = List.of("MARIADB_USER=mariadb",
+            "MARIADB_PASSWORD=mariadb", "MARIADB_ROOT_PASSWORD=mariadb");
 
     public final static ContainerImage IMAGE_1 = ContainerImage.builder()
             .id(IMAGE_1_ID)
@@ -76,20 +81,6 @@ public abstract class BaseUnitTest {
             .logo(IMAGE_1_LOGO)
             .build();
 
-    public final static ImageDto IMAGE_1_DTO = ImageDto.builder()
-            .repository(IMAGE_1_REPOSITORY)
-            .tag(IMAGE_1_TAG)
-            .hash(IMAGE_1_HASH)
-            .jdbcMethod(IMAGE_1_JDBC)
-            .dialect(IMAGE_1_DIALECT)
-            .driverClass(IMAGE_1_DRIVER)
-            .compiled(IMAGE_1_BUILT)
-            .size(BigInteger.valueOf(IMAGE_1_SIZE))
-            .environment(IMAGE_1_ENV_DTO)
-            .defaultPort(IMAGE_1_PORT)
-            .logo(IMAGE_1_LOGO)
-            .build();
-
     public final static Long CONTAINER_1_ID = 1L;
     public final static String CONTAINER_1_HASH = "deadbeef";
     public final static ContainerImage CONTAINER_1_IMAGE = IMAGE_1;
diff --git a/fda-database-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java b/fda-database-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
index 278ec3ec97a92d0fca12e8631d85f8f03044e9fe..3ff029b54a7bec0dc3cdff6fbb5f0cc90c1e17a0 100644
--- a/fda-database-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
+++ b/fda-database-service/rest-service/src/test/java/at/tuwien/BaseUnitTest.java
@@ -34,21 +34,25 @@ public abstract class BaseUnitTest {
     public final static Instant IMAGE_1_CREATED = Instant.now().minus(40, HOURS);
     public final static Instant IMAGE_1_UPDATED = Instant.now().minus(39, HOURS);
     public final static List<ContainerImageEnvironmentItem> IMAGE_1_ENVIRONMENT = List.of(ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .type(ContainerImageEnvironmentItemType.PASSWORD)
                     .key("MARIADB_ROOT_PASSWORD")
                     .value("mariadb")
                     .build(),
             ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .type(ContainerImageEnvironmentItemType.USERNAME)
                     .key("UZERNAME")
                     .value("root")
                     .build(),
             ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .type(ContainerImageEnvironmentItemType.OTHER)
                     .key("MARIADB_USER")
                     .value("mariadb")
                     .build(),
             ContainerImageEnvironmentItem.builder()
+                    .iid(IMAGE_1_ID)
                     .type(ContainerImageEnvironmentItemType.OTHER)
                     .key("MARIADB_PASSWORD")
                     .value("mariadb")
@@ -112,7 +116,7 @@ public abstract class BaseUnitTest {
             .name(CONTAINER_1_NAME)
             .hash(CONTAINER_1_HASH)
             .internalName(CONTAINER_1_INTERNALNAME)
-            .containerCreated(CONTAINER_1_CREATED)
+            .created(CONTAINER_1_CREATED)
             .lastModified(CONTAINER_1_UPDATED)
             .image(IMAGE_1)
             .build();
@@ -122,7 +126,7 @@ public abstract class BaseUnitTest {
             .name(CONTAINER_2_NAME)
             .hash(CONTAINER_2_HASH)
             .internalName(CONTAINER_2_INTERNALNAME)
-            .containerCreated(CONTAINER_2_CREATED)
+            .created(CONTAINER_2_CREATED)
             .lastModified(CONTAINER_2_UPDATED)
             .image(IMAGE_1)
             .build();
diff --git a/fda-database-service/services/src/main/java/at/tuwien/service/impl/HibernateConnector.java b/fda-database-service/services/src/main/java/at/tuwien/service/impl/HibernateConnector.java
index e55025185d0fd934237ca10594e152e59c113069..adf076d264f357633a95afb8a340e9d1ce1dba86 100644
--- a/fda-database-service/services/src/main/java/at/tuwien/service/impl/HibernateConnector.java
+++ b/fda-database-service/services/src/main/java/at/tuwien/service/impl/HibernateConnector.java
@@ -27,32 +27,21 @@ public abstract class HibernateConnector {
     private static final Integer TIMEOUT = 1800;
     private static final String SESSION_CONTEXT = "thread";
     private static final String COORDINATOR_CLASS = "jdbc";
+    private static final String MARIADB_USERNAME = "root";
+    private static final String MARIADB_PASSWORD = "mariadb";
 
     @Transactional
     protected SessionFactory getSessionFactory(Container container) {
         final String url = "jdbc:" + container.getImage().getJdbcMethod() + "://" + container.getInternalName() + "/";
         log.trace("hibernate jdbc url '{}'", url);
-        final String username = container.getImage().getEnvironment()
-                .stream()
-                .filter(e -> e.getType().equals(ContainerImageEnvironmentItemType.USERNAME))
-                .map(ContainerImageEnvironmentItem::getValue)
-                .collect(Collectors.toList())
-                .get(0);
-        final String password = container.getImage().getEnvironment()
-                .stream()
-                .filter(e -> e.getType().equals(ContainerImageEnvironmentItemType.PASSWORD))
-                .map(ContainerImageEnvironmentItem::getValue)
-                .collect(Collectors.toList())
-                .get(0);
         final Configuration configuration = new Configuration()
                 .setProperty("hibernate.connection.url", url)
-                .setProperty("hibernate.connection.username", username)
-                .setProperty("hibernate.connection.password", password)
+                .setProperty("hibernate.connection.username", MARIADB_USERNAME)
+                .setProperty("hibernate.connection.password", MARIADB_PASSWORD)
                 .setProperty("hibernate.connection.driver_class", container.getImage().getDriverClass())
                 .setProperty("hibernate.dialect", container.getImage().getDialect())
                 .setProperty("hibernate.current_session_context_class", SESSION_CONTEXT)
                 .setProperty("hibernate.transaction.coordinator_class", COORDINATOR_CLASS)
-//                .setProperty("hibernate.hbm2ddl.auto", "update")
                 .setProperty("hibernate.c3p0.min_size", String.valueOf(MIN_SIZE))
                 .setProperty("hibernate.c3p0.max_size", String.valueOf(MAX_SIZE))
                 .setProperty("hibernate.c3p0.acquire_increment", String.valueOf(INCREMENT_SIZE))
diff --git a/fda-metadata-db/api/src/main/java/at/tuwien/api/container/image/ImageEnvItemDto.java b/fda-metadata-db/api/src/main/java/at/tuwien/api/container/image/ImageEnvItemDto.java
index 7c17ad315e48bac1fce3b66ab1318d4b1652e54e..f52f97668bd0533fe524f6bff8b45c78ccee8db5 100644
--- a/fda-metadata-db/api/src/main/java/at/tuwien/api/container/image/ImageEnvItemDto.java
+++ b/fda-metadata-db/api/src/main/java/at/tuwien/api/container/image/ImageEnvItemDto.java
@@ -4,6 +4,7 @@ import io.swagger.annotations.ApiModelProperty;
 import lombok.*;
 
 import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.NotNull;
 
 @Getter
 @Setter
@@ -13,6 +14,10 @@ import javax.validation.constraints.NotBlank;
 @NoArgsConstructor
 public class ImageEnvItemDto {
 
+    @NotNull
+    @ApiModelProperty(required = true, example = "1")
+    private Long iid;
+
     @NotBlank
     @ApiModelProperty(required = true, example = "POSTGRES_USER")
     private String key;
diff --git a/fda-metadata-db/entities/src/main/java/at/tuwien/entities/container/Container.java b/fda-metadata-db/entities/src/main/java/at/tuwien/entities/container/Container.java
index fd8085d2041cac0f44ca0254828ed769e2dd9af3..003c410067f60413297e8e5cb8c95f7071983a35 100644
--- a/fda-metadata-db/entities/src/main/java/at/tuwien/entities/container/Container.java
+++ b/fda-metadata-db/entities/src/main/java/at/tuwien/entities/container/Container.java
@@ -23,7 +23,7 @@ import java.util.List;
 @Where(clause = "deleted is null")
 @EntityListeners(AuditingEntityListener.class)
 @EqualsAndHashCode(onlyExplicitlyIncluded = true)
-@SQLDelete(sql = "update mdb_container set deleted = NOW() where id = ?")
+@SQLDelete(sql = "update mdb_containers set deleted = NOW() where id = ?")
 @Table(name = "mdb_containers")
 public class Container {