diff --git a/tests/activities/activities_namespace_test.py b/tests/activities/activities_namespace_test.py
index fd1e2f2e..fb1045d3 100644
--- a/tests/activities/activities_namespace_test.py
+++ b/tests/activities/activities_namespace_test.py
@@ -8,7 +8,8 @@
 
 valid_activity_data = {
     "name": fake.company(),
-    "description": fake.paragraph()
+    "description": fake.paragraph(),
+    "tenant_id": fake.uuid4()
 }
 
 fake_activity = ({
diff --git a/tests/projects/projects_namespace_test.py b/tests/projects/projects_namespace_test.py
index 4d800b25..2e077640 100644
--- a/tests/projects/projects_namespace_test.py
+++ b/tests/projects/projects_namespace_test.py
@@ -11,8 +11,11 @@
 valid_project_data = {
     "name": fake.company(),
     "description": fake.paragraph(),
-    "type": fake.word(PROJECT_TYPE.valid_type_values()),
+    'customer_id': fake.uuid4(),
+    'tenant_id': fake.uuid4(),
+    'project_type_id': fake.uuid4()
 }
+
 fake_project = ({
     "id": fake.random_int(1, 9999)
 }).update(valid_project_data)
diff --git a/tests/resources.py b/tests/resources.py
index 7d7f64d4..662f3215 100644
--- a/tests/resources.py
+++ b/tests/resources.py
@@ -1,9 +1,12 @@
 from time_tracker_api.sql_repository import db, AuditedSQLModel
 
+from sqlalchemy_utils import UUIDType
+import uuid
+
 
 class PersonSQLModel(db.Model, AuditedSQLModel):
     __tablename__ = 'test'
-    id = db.Column(db.Integer, primary_key=True)
+    id = db.Column(UUIDType(binary=False), primary_key=True, default=uuid.uuid4)
     name = db.Column(db.String(80), unique=False, nullable=False)
     email = db.Column(db.String(120), unique=True, nullable=False)
     age = db.Column(db.Integer, nullable=False)
diff --git a/tests/time_entries/time_entries_namespace_test.py b/tests/time_entries/time_entries_namespace_test.py
index 7d1f931e..09be8af9 100644
--- a/tests/time_entries/time_entries_namespace_test.py
+++ b/tests/time_entries/time_entries_namespace_test.py
@@ -7,12 +7,13 @@
 fake = Faker()
 
 valid_time_entry_input = {
-    "project_id": fake.random_int(1, 9999),
-    "activity_id": fake.random_int(1, 9999),
-    "technologies": fake.words(3, ['java', 'javascript', 'python', 'azure'], unique=True),
+    "project_id": fake.uuid4(),
+    "activity_id": fake.uuid4(),
     "description": fake.paragraph(nb_sentences=2),
     "start_date": fake.iso8601(end_datetime=None),
     "end_date": fake.iso8601(end_datetime=None),
+    "owner_id": fake.uuid4(),
+    "tenant_id": fake.uuid4()
 }
 fake_time_entry = ({
     "id": fake.random_int(1, 9999),
diff --git a/time_tracker_api/activities/activities_model.py b/time_tracker_api/activities/activities_model.py
index 8a6c5997..86d91754 100644
--- a/time_tracker_api/activities/activities_model.py
+++ b/time_tracker_api/activities/activities_model.py
@@ -7,13 +7,17 @@ class ActivityDao(CRUDDao):
 
 def create_dao() -> ActivityDao:
     from time_tracker_api.sql_repository import db
-    from time_tracker_api.sql_repository import SQLCRUDDao, AuditedSQLModel
+    from time_tracker_api.sql_repository import SQLCRUDDao
+    from sqlalchemy_utils import UUIDType
+    import uuid
 
-    class ActivitySQLModel(db.Model, AuditedSQLModel):
+    class ActivitySQLModel(db.Model):
         __tablename__ = 'activity'
-        id = db.Column(db.Integer, primary_key=True)
+        id = db.Column(UUIDType(binary=False), primary_key=True, default=uuid.uuid4)
         name = db.Column(db.String(50), unique=True, nullable=False)
         description = db.Column(db.String(250), unique=False, nullable=False)
+        deleted = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        tenant_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
 
         def __repr__(self):
             return '<Activity %r>' % self.name
diff --git a/time_tracker_api/activities/activities_namespace.py b/time_tracker_api/activities/activities_namespace.py
index 8d399659..c63b5f56 100644
--- a/time_tracker_api/activities/activities_namespace.py
+++ b/time_tracker_api/activities/activities_namespace.py
@@ -24,6 +24,12 @@
         description='Comments about the activity',
         example=faker.paragraph(),
     ),
+    'tenant_id': fields.String(
+        required=True,
+        title='Identifier of Tenant',
+        description='Tenant this activity belongs to',
+        example=faker.uuid4(),
+    )
 })
 
 activity_response_fields = {
@@ -32,8 +38,8 @@
         required=True,
         title='Identifier',
         description='The unique identifier',
-        example=faker.random_int(1, 9999),
-    )
+        example=faker.uuid4(),
+    ),
 }
 activity_response_fields.update(audit_fields)
 
diff --git a/time_tracker_api/api.py b/time_tracker_api/api.py
index 5a0156cd..cb1a6afa 100644
--- a/time_tracker_api/api.py
+++ b/time_tracker_api/api.py
@@ -14,31 +14,12 @@
 
 # Common models structure
 audit_fields = {
-    'created_at': fields.Date(
+    'deleted': fields.String(
         readOnly=True,
-        title='Created',
-        description='Date of creation',
-        example=faker.iso8601(end_datetime=None),
-    ),
-    'updated_at': fields.Date(
-        readOnly=True,
-        title='Updated',
-        description='Date of update',
-        example=faker.iso8601(end_datetime=None),
-    ),
-    'created_by': fields.String(
-        readOnly=True,
-        title='Creator',
-        max_length=64,
-        description='User that created it',
-        example='anonymous',
-    ),
-    'updated_by': fields.String(
-        readOnly=True,
-        title='Updater',
-        max_length=64,
-        description='User that updated it',
-        example='anonymous',
+        required=True,
+        title='Last event Identifier',
+        description='Last event over this resource',
+        example=faker.uuid4(),
     ),
 }
 
diff --git a/time_tracker_api/projects/projects_model.py b/time_tracker_api/projects/projects_model.py
index f0968885..fbf1630f 100644
--- a/time_tracker_api/projects/projects_model.py
+++ b/time_tracker_api/projects/projects_model.py
@@ -19,15 +19,19 @@ class ProjectDao(CRUDDao):
 def create_dao() -> ProjectDao:
     from time_tracker_api.sql_repository import db
     from time_tracker_api.database import COMMENTS_MAX_LENGTH
-    from time_tracker_api.sql_repository import SQLCRUDDao, AuditedSQLModel
+    from time_tracker_api.sql_repository import SQLCRUDDao
+    from sqlalchemy_utils import UUIDType
+    import uuid
 
-    class ProjectSQLModel(db.Model, AuditedSQLModel):
+    class ProjectSQLModel(db.Model):
         __tablename__ = 'project'
-        id = db.Column(db.Integer, primary_key=True)
+        id = db.Column(UUIDType(binary=False), primary_key=True, default=uuid.uuid4)
         name = db.Column(db.String(50), unique=True, nullable=False)
         description = db.Column(db.String(COMMENTS_MAX_LENGTH), unique=False, nullable=False)
-        type = db.Column(db.String(10), nullable=False)
-        active = db.Column(db.Boolean, default=True)
+        project_type_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        customer_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        deleted = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        tenant_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
 
         def __repr__(self):
             return '<Project %r>' % self.name
diff --git a/time_tracker_api/projects/projects_namespace.py b/time_tracker_api/projects/projects_namespace.py
index 51c20e51..5e236a3f 100644
--- a/time_tracker_api/projects/projects_namespace.py
+++ b/time_tracker_api/projects/projects_namespace.py
@@ -24,20 +24,23 @@
         description='Description about the project',
         example=faker.paragraph(),
     ),
-    'type': fields.String(
-        required=False,
-        title='Type',
-        max_length=10,
-        description='If it is `Costumer`, `Training` or other type',
-        enum=PROJECT_TYPE.valid_type_values(),
-        example=faker.word(PROJECT_TYPE.valid_type_values()),
+    'customer_id': fields.String(
+        required=True,
+        title='Identifier of the Customer',
+        description='Customer this project belongs to',
+        example=faker.uuid4(),
     ),
-    'active': fields.Boolean(
-        title='Is active?',
-        description='Whether the project is active or not',
-        default=True,
-        example=faker.boolean(),
+    'tenant_id': fields.String(
+        required=True,
+        title='Identifier of Tenant',
+        description='Tenant this project belongs to',
+        example=faker.uuid4(),
     ),
+    'project_type_id': fields.String(
+        title='Identifier of Project type',
+        description='Type of the project. Used for grouping',
+        example=faker.uuid4(),
+    )
 })
 
 project_response_fields = {
@@ -46,7 +49,7 @@
         required=True,
         title='Identifier',
         description='The unique identifier',
-        example=faker.random_int(1, 9999),
+        example=faker.uuid4(),
     )
 }
 project_response_fields.update(audit_fields)
diff --git a/time_tracker_api/time_entries/time_entries_model.py b/time_tracker_api/time_entries/time_entries_model.py
index 7e216557..1460685b 100644
--- a/time_tracker_api/time_entries/time_entries_model.py
+++ b/time_tracker_api/time_entries/time_entries_model.py
@@ -10,21 +10,27 @@ class TimeEntriesDao(CRUDDao):
 def create_dao() -> TimeEntriesDao:
     from time_tracker_api.sql_repository import db
     from time_tracker_api.database import COMMENTS_MAX_LENGTH
-    from time_tracker_api.sql_repository import SQLCRUDDao, AuditedSQLModel
+    from time_tracker_api.sql_repository import SQLCRUDDao
+    from sqlalchemy_utils import UUIDType
+    import uuid
 
-    class TimeEntrySQLModel(db.Model, AuditedSQLModel):
+    class TimeEntrySQLModel(db.Model):
         __tablename__ = 'time_entry'
-        id = db.Column(db.Integer, primary_key=True)
+        id = db.Column(UUIDType(binary=False), primary_key=True, default=uuid.uuid4)
         description = db.Column(db.String(COMMENTS_MAX_LENGTH))
         start_date = db.Column(db.DateTime, server_default=db.func.now())
         end_date = db.Column(db.DateTime)
-        project_id = db.Column(db.Integer,
+        project_id = db.Column(UUIDType(binary=False),
                                db.ForeignKey('project.id'),
                                nullable=False)
-        activity_id = db.Column(db.Integer,
+        activity_id = db.Column(UUIDType(binary=False),
                                 db.ForeignKey('activity.id'),
                                 nullable=False)
         technologies = db.Column(ScalarListType())
+        uri = db.Column(db.String(500))
+        owner_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        deleted = db.Column(UUIDType(binary=False), default=uuid.uuid4)
+        tenant_id = db.Column(UUIDType(binary=False), default=uuid.uuid4)
 
         @property
         def running(self):
diff --git a/time_tracker_api/time_entries/time_entries_namespace.py b/time_tracker_api/time_entries/time_entries_namespace.py
index 936347b8..a5d71ca5 100644
--- a/time_tracker_api/time_entries/time_entries_namespace.py
+++ b/time_tracker_api/time_entries/time_entries_namespace.py
@@ -14,28 +14,17 @@
 
 # TimeEntry Model
 time_entry_input = ns.model('TimeEntryInput', {
-    'project_id': fields.Integer(
+    'project_id': fields.String(
         required=True,
         title='Project',
         description='The id of the selected project',
-        example=faker.random_int(1, 9999),
+        example=faker.uuid4(),
     ),
-    'activity_id': fields.Integer(
+    'activity_id': fields.String(
+        required=True,
         title='Activity',
         description='The id of the selected activity',
-        example=faker.random_int(1, 9999),
-    ),
-    'technologies': fields.List(
-        fields.String(
-            required=True,
-            title='Technologies',
-            description='Technology names used in this time-entry',
-        ),
-        example=faker.words(
-            3,
-            ['java', 'elixir', 'python', 'docker'],
-            unique=True
-        )
+        example=faker.uuid4(),
     ),
     'description': fields.String(
         title='Comments',
@@ -54,6 +43,30 @@
         description='When the user ended doing this activity',
         example=faker.iso8601(end_datetime=None),
     ),
+    'uri': fields.String(
+        title='Uniform Resource identifier',
+        description='Either identifier or locator',
+        example=faker.words(
+            1,
+            [
+                'https://github.com/ioet/time-tracker-backend/issues/51',
+                '#54',
+                'TT-54'
+            ]
+        ),
+    ),
+    'owner_id': fields.String(
+        required=True,
+        title='Owner of time entry',
+        description='User who owns the time entry',
+        example=faker.uuid4(),
+    ),
+    'tenant_id': fields.String(
+        required=True,
+        title='Identifier of Tenant',
+        description='Tenant this project belongs to',
+        example=faker.uuid4(),
+    ),
 })
 
 time_entry_response_fields = {
@@ -61,7 +74,7 @@
         readOnly=True,
         title='Identifier',
         description='The unique identifier',
-        example=faker.random_int(1, 9999),
+        example=faker.uuid4(),
     ),
     'running': fields.Boolean(
         readOnly=True,