diff --git a/dbrepo-metadata-db/migration/16/data.py b/dbrepo-metadata-db/migration/16/data.py
index eeade6f3ab6a989103e9ae88f56ed59e4779745f..6d919cfa382b286783d649f30208f1ac0c3606c8 100644
--- a/dbrepo-metadata-db/migration/16/data.py
+++ b/dbrepo-metadata-db/migration/16/data.py
@@ -26,7 +26,7 @@ def update_concepts() -> None:
 def update_ontologies() -> None:
     plan.append("-- ontologies")
     plan.append("BEGIN;")
-    plan.append(f"UPDATE mdb_ontology SET id = UUID()")
+    plan.append(f"UPDATE mdb_ontologies SET id = UUID();")
     plan.append("COMMIT;")
 
 
@@ -74,14 +74,14 @@ def update_databases() -> None:
         new_id: uuid = uuid.uuid4()
         plan.append(f"UPDATE mdb_tables SET tDBID = '{new_id}' WHERE tDBID = {old_id};")
         plan.append(f"UPDATE mdb_have_access SET database_id = '{new_id}' WHERE database_id = {old_id};")
-        plan.append(f"UPDATE mdb_views SET vdbid = '{new_id}' WHERE vdbid = {old_id};")
+        plan.append(f"UPDATE mdb_view SET vdbid = '{new_id}' WHERE vdbid = {old_id};")
         plan.append(f"UPDATE mdb_identifiers SET dbid = '{new_id}' WHERE dbid = {old_id};")
         plan.append(f"UPDATE mdb_access SET aDBID = '{new_id}' WHERE aDBID = {old_id};")
         for view in database.views:
             v_old_id: int = view.id
             v_new_id: uuid = uuid.uuid4()
             plan.append(f"UPDATE mdb_identifiers SET vid = '{v_new_id}' WHERE vid = {v_old_id};")
-            plan.append(f"UPDATE mdb_view_columns SET id = UUID(), view_id = '{v_new_id}' WHERE tid = {v_old_id};")
+            plan.append(f"UPDATE mdb_view_columns SET id = UUID(), view_id = '{v_new_id}' WHERE id = {v_old_id};")
         for table in database.tables:
             tbl_old_id: int = table.id
             tbl_new_id: uuid = uuid.uuid4()
@@ -99,8 +99,8 @@ def update_databases() -> None:
             for uk in table.constraints.uniques:
                 uk_old_id: int = uk.id
                 uk_new_id: uuid = uuid.uuid4()
-                plan.append(f"UPDATE mdb_constraints_unique SET uid = '{uk_new_id}', tid = '{tbl_new_id}' WHERE uid = {uk_old_id}")
-                plan.append(f"UPDATE mdb_constraints_unique_columns SET id = UUID(), uid = '{uk_new_id}' WHERE uid = {uk_old_id}")
+                plan.append(f"UPDATE mdb_constraints_unique SET uid = '{uk_new_id}', tid = '{tbl_new_id}' WHERE uid = {uk_old_id};")
+                plan.append(f"UPDATE mdb_constraints_unique_columns SET id = UUID(), uid = '{uk_new_id}' WHERE uid = {uk_old_id};")
             for column in table.columns:
                 col_old_id: int = column.id
                 col_new_id: uuid = uuid.uuid4()
@@ -120,7 +120,7 @@ def update_databases() -> None:
 def update_messages() -> None:
     plan.append("-- messages")
     plan.append("BEGIN;")
-    plan.append(f"UPDATE mdb_banner_messages SET ID = UUID();")
+    plan.append(f"UPDATE mdb_messages SET ID = UUID();")
     plan.append("COMMIT;")
 
 def update_identifiers() -> None:
@@ -134,7 +134,7 @@ def update_identifiers() -> None:
         plan.append(f"UPDATE mdb_identifier_descriptions SET id = UUID(), pid = '{i_new_id}' WHERE pid = {i_old_id};")
         plan.append(f"UPDATE mdb_identifier_titles SET id = UUID(), pid = '{i_new_id}' WHERE pid = {i_old_id};")
         plan.append(f"UPDATE mdb_identifier_funders SET id = UUID(), pid = '{i_new_id}' WHERE pid = {i_old_id};")
-        plan.append(f"UPDATE mdb_identifier_licenses SET id = UUID(), pid = '{i_new_id}' WHERE pid = {i_old_id};")
+        plan.append(f"UPDATE mdb_identifier_licenses SET pid = '{i_new_id}' WHERE pid = {i_old_id};")
     plan.append("COMMIT;")
 
 
diff --git a/dbrepo-metadata-db/migration/16/schema.sql b/dbrepo-metadata-db/migration/16/schema.sql
index e3cf081f33838cbe37dfeafd9aec2d173799b665..5da2bb436bbbc48b49ca74af64c65282abaecf98 100644
--- a/dbrepo-metadata-db/migration/16/schema.sql
+++ b/dbrepo-metadata-db/migration/16/schema.sql
@@ -83,6 +83,8 @@ ALTER TABLE mdb_identifier_creators
     DROP SYSTEM VERSIONING;
 ALTER TABLE mdb_identifier_creators
     DROP FOREIGN KEY mdb_identifier_creators_ibfk_1;
+ALTER TABLE mdb_identifier_creators
+    CHANGE COLUMN id id VARCHAR(36) NOT NULL DEFAULT UUID();
 ALTER TABLE mdb_identifier_creators
     CHANGE COLUMN pid pid VARCHAR(36) NOT NULL;
 -- mdb_identifier_descriptions
@@ -90,6 +92,8 @@ ALTER TABLE mdb_identifier_descriptions
     DROP SYSTEM VERSIONING;
 ALTER TABLE mdb_identifier_descriptions
     DROP FOREIGN KEY mdb_identifier_descriptions_ibfk_1;
+ALTER TABLE mdb_identifier_descriptions
+    CHANGE COLUMN id id VARCHAR(36) NOT NULL DEFAULT UUID();
 ALTER TABLE mdb_identifier_descriptions
     CHANGE COLUMN pid pid VARCHAR(36) NOT NULL;
 -- mdb_identifier_funders
@@ -97,6 +101,8 @@ ALTER TABLE mdb_identifier_funders
     DROP SYSTEM VERSIONING;
 ALTER TABLE mdb_identifier_funders
     DROP FOREIGN KEY mdb_identifier_funders_ibfk_1;
+ALTER TABLE mdb_identifier_funders
+    CHANGE COLUMN id id VARCHAR(36) NOT NULL DEFAULT UUID();
 ALTER TABLE mdb_identifier_funders
     CHANGE COLUMN pid pid VARCHAR(36) NOT NULL;
 -- mdb_identifier_licenses
@@ -226,6 +232,8 @@ ALTER TABLE mdb_constraints_primary_key
     CHANGE COLUMN pkid pkid VARCHAR(36) NOT NULL DEFAULT UUID();
 ALTER TABLE mdb_constraints_primary_key
     CHANGE COLUMN tID tID VARCHAR(36) NOT NULL;
+ALTER TABLE mdb_constraints_primary_key
+    CHANGE COLUMN cid cid VARCHAR(36) NOT NULL;
 -- mdb_constraints_unique
 ALTER TABLE mdb_constraints_unique
     DROP FOREIGN KEY mdb_constraints_unique_ibfk_1;
@@ -410,9 +418,9 @@ ALTER TABLE mdb_constraints_foreign_key_reference
     ADD SYSTEM VERSIONING;
 -- mdb_constraints_primary_key
 ALTER TABLE mdb_constraints_primary_key
-    ADD FOREIGN KEY (pkid) REFERENCES mdb_tables (ID);
+    ADD FOREIGN KEY (tID) REFERENCES mdb_tables (ID);
 ALTER TABLE mdb_constraints_primary_key
-    ADD FOREIGN KEY (tID) REFERENCES mdb_columns (ID);
+    ADD FOREIGN KEY (cid) REFERENCES mdb_columns (ID);
 ALTER TABLE mdb_constraints_primary_key
     ADD SYSTEM VERSIONING;
 -- mdb_constraints_unique
diff --git a/lib/python/tests/test_unit_container.py b/lib/python/tests/test_unit_container.py
index b7a35e6a4a714f38d3cb06841541b182a0c769e2..39140816355ad68e9c8528bfe60b5122aa6e4ee2 100644
--- a/lib/python/tests/test_unit_container.py
+++ b/lib/python/tests/test_unit_container.py
@@ -28,7 +28,8 @@ class ContainerUnitTest(unittest.TestCase):
                                image=ImageBrief(id=1,
                                                 name="mariadb",
                                                 version="10.11.3",
-                                                jdbc_method="mariadb"),
+                                                jdbc_method="mariadb",
+                                                default=True),
                                hash="f829dd8a884182d0da846f365dee1221fd16610a14c81b8f9f295ff162749e50")
             ]
             # mock
diff --git a/lib/python/tests/test_unit_database.py b/lib/python/tests/test_unit_database.py
index 203c296b9c86d9bca0fce4f3b433af298f6cd251..9a90f1f513da732e94b0502a763da8e7ce144fea 100644
--- a/lib/python/tests/test_unit_database.py
+++ b/lib/python/tests/test_unit_database.py
@@ -28,18 +28,7 @@ class DatabaseUnitTest(unittest.TestCase):
                 contact=UserBrief(id='8638c043-5145-4be8-a3e4-4b79991b0a16', username='mweise'),
                 internal_name='test_abcd',
                 is_public=True,
-                is_schema_public=True,
-                container=ContainerBrief(
-                    id=1,
-                    name='MariaDB Galera 11.1.3',
-                    internal_name='mariadb',
-                    image=ImageBrief(
-                        id=1,
-                        name='mariadb',
-                        version='11.2.2',
-                        jdbc_method='mariadb'
-                    )
-                )
+                is_schema_public=True
             )
         ]
         with requests_mock.Mocker() as mock:
@@ -67,7 +56,8 @@ class DatabaseUnitTest(unittest.TestCase):
                     id=1,
                     name='mariadb',
                     version='11.2.2',
-                    jdbc_method='mariadb'
+                    jdbc_method='mariadb',
+                    default=True
                 )
             )
         )
@@ -122,7 +112,8 @@ class DatabaseUnitTest(unittest.TestCase):
                     id=1,
                     name='mariadb',
                     version='11.2.2',
-                    jdbc_method='mariadb'
+                    jdbc_method='mariadb',
+                    default=True
                 )
             )
         )
@@ -184,7 +175,8 @@ class DatabaseUnitTest(unittest.TestCase):
                     id=1,
                     name='mariadb',
                     version='11.2.2',
-                    jdbc_method='mariadb'
+                    jdbc_method='mariadb',
+                    default=True
                 )
             )
         )
@@ -246,7 +238,8 @@ class DatabaseUnitTest(unittest.TestCase):
                     id=1,
                     name='mariadb',
                     version='11.2.2',
-                    jdbc_method='mariadb'
+                    jdbc_method='mariadb',
+                    default=True
                 )
             )
         )
diff --git a/lib/python/tests/test_unit_identifier.py b/lib/python/tests/test_unit_identifier.py
index 8726d05ef23108c2a0a8fb9e8c4cd65052e19b1e..930e60dc5618766a620b33d47936f9ad45edfa41 100644
--- a/lib/python/tests/test_unit_identifier.py
+++ b/lib/python/tests/test_unit_identifier.py
@@ -6,7 +6,7 @@ from dbrepo.RestClient import RestClient
 from dbrepo.api.dto import Identifier, IdentifierType, SaveIdentifierTitle, Creator, IdentifierTitle, \
     IdentifierDescription, SaveIdentifierDescription, Language, SaveIdentifierFunder, SaveRelatedIdentifier, \
     RelatedIdentifierRelation, RelatedIdentifierType, IdentifierFunder, RelatedIdentifier, UserBrief, \
-    IdentifierStatusType, CreateIdentifierCreator
+    IdentifierStatusType, CreateIdentifierCreator, IdentifierBrief
 from dbrepo.api.exceptions import MalformedError, ForbiddenError, NotExistsError, AuthenticationError
 
 
@@ -112,24 +112,17 @@ class IdentifierUnitTest(unittest.TestCase):
 
     def test_get_identifiers_succeeds(self):
         with requests_mock.Mocker() as mock:
-            exp = [Identifier(id=10,
-                              database_id=1,
-                              view_id=32,
-                              publication_year=2024,
-                              publisher='TU Wien',
-                              type=IdentifierType.VIEW,
-                              language=Language.EN,
-                              descriptions=[IdentifierDescription(id=2, description='Test Description')],
-                              titles=[IdentifierTitle(id=3, title='Test Title')],
-                              funders=[IdentifierFunder(id=4, funder_name='FWF')],
-                              related_identifiers=[RelatedIdentifier(id=7, value='10.12345/abc',
-                                                                     relation=RelatedIdentifierRelation.CITES,
-                                                                     type=RelatedIdentifierType.DOI)],
-                              creators=[Creator(id=5, creator_name='Carberry, Josiah')],
-                              status=IdentifierStatusType.PUBLISHED,
-                              owner=UserBrief(id='8638c043-5145-4be8-a3e4-4b79991b0a16', username='mweise'))]
+            exp = [IdentifierBrief(id=10,
+                                   database_id=1,
+                                   view_id=32,
+                                   publication_year=2024,
+                                   publisher='TU Wien',
+                                   type=IdentifierType.VIEW,
+                                   titles=[IdentifierTitle(id=3, title='Test Title')],
+                                   status=IdentifierStatusType.PUBLISHED,
+                                   owned_by='8638c043-5145-4be8-a3e4-4b79991b0a16')]
             # mock
-            mock.get('/api/identifiers', json=[exp[0].model_dump()], headers={"Accept": "application/json"})
+            mock.get('/api/identifier', json=[exp[0].model_dump()], headers={"Accept": "application/json"})
             # test
             response = RestClient().get_identifiers()
             self.assertEqual(exp, response)