diff --git a/README.md b/README.md
index d69e4380..bdb992e2 100644
--- a/README.md
+++ b/README.md
@@ -44,12 +44,23 @@ $ sudo -u postgres -i
 postgres$ createdb dh-db1
 ```
 
+Then execute, in the same directory where `app.py` is:
+```bash
+$ flask init-db
+```
 
+This creates the tables in the database you created before.
 
-And then execute, in the same directory where `app.py` is:
+Finally, run the app:
 ```bash
 $ flask run
 ```
 
+
 See the [Flask quickstart](http://flask.pocoo.org/docs/1.0/quickstart/)
 for more info.
+
+Devicehub has many commands that allows you to administrate it. You
+can, for example, create a dummy database of devices with ``flask dummy``
+or create users with ``flask create-user``. See all the
+available commands by just executing ``flask``.
\ No newline at end of file
diff --git a/ereuse_devicehub/config.py b/ereuse_devicehub/config.py
index e796ebca..c6dce475 100644
--- a/ereuse_devicehub/config.py
+++ b/ereuse_devicehub/config.py
@@ -1,14 +1,14 @@
 from distutils.version import StrictVersion
 from typing import Set
 
-from ereuse_devicehub.resources.device import ComponentDef, ComputerDef, DataStorageDef, \
-    DesktopDef, DeviceDef, GraphicCardDef, HardDriveDef, LaptopDef, MicrotowerDef, \
+from ereuse_devicehub.resources.device import ComponentDef, ComputerDef, ComputerMonitorDef, \
+    DataStorageDef, DesktopDef, DeviceDef, GraphicCardDef, HardDriveDef, LaptopDef, MicrotowerDef, \
     MotherboardDef, NetbookDef, NetworkAdapterDef, ProcessorDef, RamModuleDef, ServerDef, \
     SolidStateDriveDef
-from ereuse_devicehub.resources.event import AddDef, AggregateRateDef, BenchmarkDataStorageDef, \
-    BenchmarkDef, BenchmarkProcessorDef, BenchmarkProcessorSysbenchDef, BenchmarkRamSysbenchDef, \
-    BenchmarkWithRateDef, EraseBasicDef, EraseSectorsDef, EventDef, InstallDef, \
-    PhotoboxSystemRateDef, PhotoboxUserDef, RateDef, RemoveDef, SnapshotDef, StepDef, \
+from ereuse_devicehub.resources.event import AddDef, AggregateRateDef, AppRateDef, \
+    BenchmarkDataStorageDef, BenchmarkDef, BenchmarkProcessorDef, BenchmarkProcessorSysbenchDef, \
+    BenchmarkRamSysbenchDef, BenchmarkWithRateDef, EraseBasicDef, EraseSectorsDef, EventDef, \
+    InstallDef, PhotoboxSystemRateDef, PhotoboxUserDef, RateDef, RemoveDef, SnapshotDef, StepDef, \
     StepRandomDef, StepZeroDef, StressTestDef, TestDataStorageDef, TestDef, WorkbenchRateDef
 from ereuse_devicehub.resources.inventory import InventoryDef
 from ereuse_devicehub.resources.tag import TagDef
@@ -19,13 +19,14 @@ from teal.config import Config
 class DevicehubConfig(Config):
     RESOURCE_DEFINITIONS = {
         DeviceDef, ComputerDef, DesktopDef, LaptopDef, NetbookDef, ServerDef,
-        MicrotowerDef, ComponentDef, GraphicCardDef, DataStorageDef, SolidStateDriveDef,
+        MicrotowerDef, ComputerMonitorDef, ComponentDef, GraphicCardDef, DataStorageDef,
+    SolidStateDriveDef,
         HardDriveDef, MotherboardDef, NetworkAdapterDef, RamModuleDef, ProcessorDef, UserDef,
         OrganizationDef, TagDef, EventDef, AddDef, RemoveDef, EraseBasicDef, EraseSectorsDef,
         StepDef, StepZeroDef, StepRandomDef, RateDef, AggregateRateDef, WorkbenchRateDef,
         PhotoboxUserDef, PhotoboxSystemRateDef, InstallDef, SnapshotDef, TestDef,
         TestDataStorageDef, StressTestDef, WorkbenchRateDef, InventoryDef, BenchmarkDef,
-        BenchmarkDataStorageDef, BenchmarkWithRateDef, BenchmarkProcessorDef,
+        BenchmarkDataStorageDef, BenchmarkWithRateDef, AppRateDef, BenchmarkProcessorDef,
         BenchmarkProcessorSysbenchDef, BenchmarkRamSysbenchDef
     }
     PASSWORD_SCHEMES = {'pbkdf2_sha256'}  # type: Set[str]
diff --git a/ereuse_devicehub/devicehub.py b/ereuse_devicehub/devicehub.py
index ac13a817..a99cc8e3 100644
--- a/ereuse_devicehub/devicehub.py
+++ b/ereuse_devicehub/devicehub.py
@@ -5,12 +5,14 @@ from flask_sqlalchemy import SQLAlchemy
 from ereuse_devicehub.auth import Auth
 from ereuse_devicehub.client import Client
 from ereuse_devicehub.db import db
+from ereuse_devicehub.dummy.dummy import Dummy
 from teal.config import Config as ConfigClass
 from teal.teal import Teal
 
 
 class Devicehub(Teal):
     test_client_class = Client
+    Dummy = Dummy
 
     def __init__(self,
                  config: ConfigClass,
@@ -29,5 +31,4 @@ class Devicehub(Teal):
         super().__init__(config, db, import_name, static_url_path, static_folder, static_host,
                          host_matching, subdomain_matching, template_folder, instance_path,
                          instance_relative_config, root_path, Auth)
-
-
+        self.dummy = Dummy(self)
diff --git a/ereuse_devicehub/dummy/__init__.py b/ereuse_devicehub/dummy/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/ereuse_devicehub/dummy/dummy.py b/ereuse_devicehub/dummy/dummy.py
new file mode 100644
index 00000000..0963d00e
--- /dev/null
+++ b/ereuse_devicehub/dummy/dummy.py
@@ -0,0 +1,62 @@
+from pathlib import Path
+
+import click
+import click_spinner
+import yaml
+from tqdm import tqdm
+
+from ereuse_devicehub.client import UserClient
+from ereuse_devicehub.db import db
+from ereuse_devicehub.resources.event.models import Snapshot
+from ereuse_devicehub.resources.tag.model import Tag
+from ereuse_devicehub.resources.user import User
+
+
+class Dummy:
+    SNAPSHOTS = (
+        'workbench-server-1',
+        'computer-monitor'
+    )
+    TAGS = (
+        'tag1',
+        'tag2',
+        'tag3'
+    )
+
+    def __init__(self, app) -> None:
+        super().__init__()
+        self.app = app
+        self.app.cli.command('dummy',
+                             short_help='Creates dummy devices and users.')(self.run)
+
+    @click.confirmation_option(prompt='This command deletes the DB in the process. '
+                                      'Do you want to continue?')
+    def run(self):
+        print('Preparing the database...')
+        with click_spinner.spinner():
+            self.app.init_db(erase=True)
+            user = self.user_client('user@dhub.com', '1234')
+            user.post(res=Tag, query=[('ids', i) for i in self.TAGS], data={})
+        print('Creating devices...')
+        for file_name in tqdm(self.SNAPSHOTS):
+            snapshot = self.file(file_name)
+            user.post(res=Snapshot, data=snapshot)
+        print('Done :-)')
+
+    def user_client(self, email: str, password: str):
+        user = User(email=email, password=password)
+        db.session.add(user)
+        db.session.commit()
+        client = UserClient(application=self.app,
+                            response_wrapper=self.app.response_class,
+                            email=user.email,
+                            password=password)
+        client.user, _ = client.login(client.email, client.password)
+        return client
+
+    def file(self, name: str):
+        with Path(__file__) \
+                .parent \
+                .joinpath('files') \
+                .joinpath(name + '.snapshot.yaml').open() as f:
+            return yaml.load(f)
diff --git a/ereuse_devicehub/dummy/files/computer-monitor.snapshot.yaml b/ereuse_devicehub/dummy/files/computer-monitor.snapshot.yaml
new file mode 100644
index 00000000..aefc5817
--- /dev/null
+++ b/ereuse_devicehub/dummy/files/computer-monitor.snapshot.yaml
@@ -0,0 +1,17 @@
+type: Snapshot
+software: AndroidApp
+version: '1.0'
+device:
+  type: ComputerMonitor
+  technology: LCD
+  manufacturer: Dell
+  model: 1707FPF
+  serialNumber: CN0FP446728728541C8S
+  resolutionWidth: 1920
+  resolutionHeight: 1080
+  size: 21.5
+  events:
+    - type: AppRate
+      appearanceRange: A
+      functionalityRange: C
+      labelling: False
diff --git a/ereuse_devicehub/dummy/files/workbench-server-1.snapshot.yaml b/ereuse_devicehub/dummy/files/workbench-server-1.snapshot.yaml
new file mode 100644
index 00000000..015739b4
--- /dev/null
+++ b/ereuse_devicehub/dummy/files/workbench-server-1.snapshot.yaml
@@ -0,0 +1,118 @@
+# A Snapshot Phase 1 with a device
+# and 1 GraphicCard, 2 RamModule, 1 Processor, 1 SSD, 1 HDD, 1 Motherboard
+# Prerequisites:
+#  - 2 tags: tag1 and tag2 from the default org
+# All numbers are invented
+
+
+type: Snapshot
+uuid: cb8ce6b5-6a1b-4084-b5b9-d8fadad2a015
+version: '11.0'
+software: Workbench
+elapsed: 500
+device:
+  type: Microtower
+  serialNumber: d1s
+  model: d1ml
+  manufacturer: d1mr
+  tags:
+    - type: Tag
+      id: tag1
+  events:
+    - type: WorkbenchRate
+      appearanceRange: A
+      functionalityRange: B
+    - type: BenchmarkRamSysbench
+      rate: 2444
+    - type: StressTest
+      elapsed: 300
+      error: False
+components:
+  - type: GraphicCard
+    serialNumber: gc1-1s
+    model: gc1-1ml
+    manufacturer: gc1-1mr
+  - type: RamModule
+    serialNumber: rm1-1s
+    model: rm1-1ml
+    manufacturer: rm1-1mr
+  - type: RamModule
+    serialNumber: rm2-1s
+    model: rm2-1ml
+    manufacturer: rm2-1mr
+  - type: Processor
+    model: p1-1s
+    manufacturer: p1-1mr
+    events:
+      - type: BenchmarkProcessor
+        rate: 2410
+      - type: BenchmarkProcessorSysbench
+        rate: 4400
+  - type: SolidStateDrive
+    serialNumber: ssd1-1s
+    model: ssd1-1ml
+    manufacturer: ssd1-1mr
+    events:
+      - type: BenchmarkDataStorage
+        readSpeed: 20
+        writeSpeed: 15
+        elapsed: 21
+      - type: TestDataStorage
+        elapsed: 233
+        firstError: 0
+        error: False
+        status: Completed without error
+        length: Short
+        lifetime: 99
+        passedLifetime: 99
+        assessment: True
+        powerCycleCount: 11
+        reallocatedSectorCount: 2
+        powerCycleCount: 4
+        reportedUncorrectableErrors: 1
+        commandTimeout: 11
+        currentPendingSectorCount: 1
+        offlineUncorrectable: 33
+        remainingLifetimePercentage: 1
+      - type: EraseSectors
+        error: False
+        cleanWithZeros: False
+        startTime: 2018-01-01T10:10:10
+        endTime: 2018-01-01T12:10:10
+        secureRandomSteps: 0
+        steps:
+          - type: StepRandom
+            startTime: 2018-01-01T10:10:10
+            endTime: 2018-01-01T12:10:10
+            error: False
+            cleanWithZeros: False
+            secureRandomSteps: 0
+  - type: HardDrive
+    serialNumber: hdd1-1s
+    model: hdd1-1ml
+    manufacturer: hdd1-1mr
+    events:
+      - type: BenchmarkDataStorage
+        readSpeed: 10
+        writeSpeed: 5
+      - type: EraseSectors
+        error: False
+        cleanWithZeros: False
+        startTime: 2018-01-01T10:10:10
+        endTime: 2018-01-01T12:10:10
+        secureRandomSteps: 0
+        steps:
+          - type: StepRandom
+            startTime: 2018-01-01T10:10:10
+            endTime: 2018-01-01T12:10:10
+            error: False
+            cleanWithZeros: False
+            secureRandomSteps: 0
+      - type: Install
+        elapsed: 420
+        error: False
+        name: LinuxMint 18.01 32b
+  - type: Motherboard
+    serialNumber: mb1-1s
+    model: mb1-1ml
+    manufacturer: mb1-1mr
diff --git a/ereuse_devicehub/resources/device/__init__.py b/ereuse_devicehub/resources/device/__init__.py
index 737a9329..0689629a 100644
--- a/ereuse_devicehub/resources/device/__init__.py
+++ b/ereuse_devicehub/resources/device/__init__.py
@@ -1,6 +1,6 @@
-from ereuse_devicehub.resources.device.schemas import Component, Computer, DataStorage, Desktop, \
-    Device, GraphicCard, HardDrive, Laptop, Microtower, Motherboard, Netbook, NetworkAdapter, \
-    Processor, RamModule, Server, SolidStateDrive
+from ereuse_devicehub.resources.device.schemas import Component, Computer, ComputerMonitor, \
+    DataStorage, Desktop, Device, GraphicCard, HardDrive, Laptop, Microtower, Motherboard, Netbook, \
+    NetworkAdapter, Processor, RamModule, Server, SolidStateDrive
 from ereuse_devicehub.resources.device.views import DeviceView
 from teal.resource import Converters, Resource
 
@@ -36,6 +36,10 @@ class MicrotowerDef(ComputerDef):
     SCHEMA = Microtower
 
 
+class ComputerMonitorDef(DeviceDef):
+    SCHEMA = ComputerMonitor
+
+
 class ComponentDef(DeviceDef):
     SCHEMA = Component
 
diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index 7cd1e067..6762caca 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -10,7 +10,8 @@ from sqlalchemy.orm import ColumnProperty, backref, relationship
 from sqlalchemy.util import OrderedSet
 from sqlalchemy_utils import ColorType
 
-from ereuse_devicehub.resources.enums import DataStorageInterface, RamFormat, RamInterface
+from ereuse_devicehub.resources.enums import ComputerMonitorTechnologies, DataStorageInterface, \
+    RamFormat, RamInterface
 from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE, STR_SM_SIZE, Thing
 from ereuse_utils.naming import Naming
 from teal.db import CASCADE, POLYMORPHIC_ID, POLYMORPHIC_ON, ResourceNotFound, check_range
@@ -18,14 +19,30 @@ from teal.db import CASCADE, POLYMORPHIC_ID, POLYMORPHIC_ON, ResourceNotFound, c
 
 class Device(Thing):
     id = Column(BigInteger, Sequence('device_seq'), primary_key=True)
+    id.comment = """
+        The identifier of the device for this database.
+    """
     type = Column(Unicode(STR_SM_SIZE), nullable=False)
     hid = Column(Unicode(STR_BIG_SIZE), unique=True)
+    hid.comment = """
+        The Hardware ID (HID) is the unique ID traceability systems 
+        use to ID a device globally.
+    """
     model = Column(Unicode(STR_BIG_SIZE))
     manufacturer = Column(Unicode(STR_SIZE))
     serial_number = Column(Unicode(STR_SIZE))
     weight = Column(Float(decimal_return_scale=3), check_range('weight', 0.1, 3))
+    weight.comment = """
+        The weight of the device in Kgm.
+    """
     width = Column(Float(decimal_return_scale=3), check_range('width', 0.1, 3))
+    width.comment = """
+        The width of the device in meters.
+    """
     height = Column(Float(decimal_return_scale=3), check_range('height', 0.1, 3))
+    height.comment = """
+        The height of the device in meters.
+    """
     depth = Column(Float(decimal_return_scale=3), check_range('depth', 0.1, 3))
     color = Column(ColorType)
 
@@ -108,6 +125,28 @@ class Microtower(Computer):
     pass
 
 
+class ComputerMonitor(Device):
+    id = Column(BigInteger, ForeignKey(Device.id), primary_key=True)
+    size = Column(Float(decimal_return_scale=2), check_range('size', 2, 150))
+    size.comment = """
+        The size of the monitor in inches.
+    """
+    technology = Column(DBEnum(ComputerMonitorTechnologies))
+    technology.comment = """
+        The technology the monitor uses to display the image.
+    """
+    resolution_width = Column(SmallInteger, check_range('resolution_width', 10, 20000))
+    resolution_width.comment = """
+        The maximum horizontal resolution the monitor can natively support
+        in pixels.
+    """
+    resolution_height = Column(SmallInteger, check_range('resolution_height', 10, 20000))
+    resolution_height.comment = """
+        The maximum vertical resolution the monitor can natively support
+        in pixels.
+    """
+
+
 class Component(Device):
     id = Column(BigInteger, ForeignKey(Device.id), primary_key=True)
 
diff --git a/ereuse_devicehub/resources/device/models.pyi b/ereuse_devicehub/resources/device/models.pyi
index bac400f5..b65a08a0 100644
--- a/ereuse_devicehub/resources/device/models.pyi
+++ b/ereuse_devicehub/resources/device/models.pyi
@@ -1,9 +1,10 @@
 from typing import Dict, List, Set
 
 from colour import Color
-from sqlalchemy import Column
+from sqlalchemy import Column, Integer
 
-from ereuse_devicehub.resources.enums import DataStorageInterface, RamFormat, RamInterface
+from ereuse_devicehub.resources.enums import ComputerMonitorTechnologies, DataStorageInterface, \
+    RamFormat, RamInterface
 from ereuse_devicehub.resources.event.models import Event, EventWithMultipleDevices, \
     EventWithOneDevice
 from ereuse_devicehub.resources.image.models import ImageList
@@ -72,6 +73,20 @@ class Microtower(Computer):
     pass
 
 
+class ComputerMonitor(Device):
+    technology = ...  # type: Column
+    size = ...  # type: Column
+    resolution_width = ...  # type: Column
+    resolution_height = ...  # type: Column
+
+    def __init__(self, **kwargs) -> None:
+        super().__init__(**kwargs)
+        technology = ...  # type: ComputerMonitorTechnologies
+        size = ...  # type: Integer
+        resolution_width = ...  # type: int
+        resolution_height = ...  # type: int
+
+
 class Component(Device):
     def __init__(self, **kwargs) -> None:
         super().__init__(**kwargs)
diff --git a/ereuse_devicehub/resources/device/schemas.py b/ereuse_devicehub/resources/device/schemas.py
index 020be4f8..831d33a4 100644
--- a/ereuse_devicehub/resources/device/schemas.py
+++ b/ereuse_devicehub/resources/device/schemas.py
@@ -1,36 +1,28 @@
-from ereuse_devicehub.marshmallow import NestedOn
-from ereuse_devicehub.resources.enums import RamFormat, RamInterface
-from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE
-from ereuse_devicehub.resources.schemas import Thing, UnitCodes
 from marshmallow import post_load, pre_load
 from marshmallow.fields import Float, Integer, Str
 from marshmallow.validate import Length, OneOf, Range
 from marshmallow_enum import EnumField
 from sqlalchemy.util import OrderedSet
 
+from ereuse_devicehub.marshmallow import NestedOn
+from ereuse_devicehub.resources.device import models as m
+from ereuse_devicehub.resources.enums import ComputerMonitorTechnologies, RamFormat, RamInterface
+from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE
+from ereuse_devicehub.resources.schemas import Thing, UnitCodes
 from teal.marshmallow import ValidationError
 
 
 class Device(Thing):
-    # todo id is dump_only except when in Snapshot
-    id = Integer(description='The identifier of the device for this database.')
-    hid = Str(dump_only=True,
-              description='The Hardware ID is the unique ID traceability systems '
-                          'use to ID a device globally.')
+    id = Integer(description=m.Device.id, dump_only=True)
+    hid = Str(dump_only=True, description=m.Device.hid)
     tags = NestedOn('Tag', many=True, collection_class=OrderedSet)
     model = Str(validate=Length(max=STR_BIG_SIZE))
     manufacturer = Str(validate=Length(max=STR_SIZE))
     serial_number = Str(data_key='serialNumber')
     product_id = Str(data_key='productId')
-    weight = Float(validate=Range(0.1, 3),
-                   unit=UnitCodes.kgm,
-                   description='The weight of the device in Kgm.')
-    width = Float(validate=Range(0.1, 3),
-                  unit=UnitCodes.m,
-                  description='The width of the device in meters.')
-    height = Float(validate=Range(0.1, 3),
-                   unit=UnitCodes.m,
-                   description='The height of the device in meters.')
+    weight = Float(validate=Range(0.1, 3), unit=UnitCodes.kgm, description=m.Device.weight)
+    width = Float(validate=Range(0.1, 3), unit=UnitCodes.m, description=m.Device.width)
+    height = Float(validate=Range(0.1, 3), unit=UnitCodes.m, description=m.Device.height)
     events = NestedOn('Event', many=True, dump_only=True)
     events_one = NestedOn('Event', many=True, load_only=True, collection_class=OrderedSet)
 
@@ -61,7 +53,6 @@ class Device(Thing):
 
 class Computer(Device):
     components = NestedOn('Component', many=True, dump_only=True, collection_class=OrderedSet)
-    pass
 
 
 class Desktop(Computer):
@@ -84,6 +75,18 @@ class Microtower(Computer):
     pass
 
 
+class ComputerMonitor(Device):
+    size = Float(description=m.ComputerMonitor.size.comment, validate=Range(2, 150))
+    technology = EnumField(ComputerMonitorTechnologies,
+                           description=m.ComputerMonitor.technology.comment)
+    resolution_width = Integer(data_key='resolutionWidth',
+                               validate=Range(10, 20000),
+                               description=m.ComputerMonitor.resolution_width.comment)
+    resolution_height = Integer(data_key='resolutionHeight',
+                                validate=Range(10, 20000),
+                                description=m.ComputerMonitor.resolution_height.comment)
+
+
 class Component(Device):
     parent = NestedOn(Device, dump_only=True)
 
diff --git a/ereuse_devicehub/resources/enums.py b/ereuse_devicehub/resources/enums.py
index cc090c5d..ac07c8d6 100644
--- a/ereuse_devicehub/resources/enums.py
+++ b/ereuse_devicehub/resources/enums.py
@@ -149,3 +149,14 @@ class DataStorageInterface(Enum):
     ATA = 'ATA'
     USB = 'USB'
     PCI = 'PCI'
+
+
+@unique
+class ComputerMonitorTechnologies(Enum):
+    CRT = 'Cathode ray tube (CRT)'
+    TFT = 'Thin-film-transistor liquid-crystal (TFT)'
+    LED = 'LED-backlit (LED)'
+    PDP = 'Plasma display panel (Plasma)'
+    LCD = 'Liquid-crystal display (any of TFT, LED, Blue Phase, IPS)'
+    OLED = 'Organic light-emitting diode (OLED)'
+    AMOLED = 'Organic light-emitting diode (AMOLED)'
diff --git a/ereuse_devicehub/resources/event/__init__.py b/ereuse_devicehub/resources/event/__init__.py
index 6d323ae1..12e38732 100644
--- a/ereuse_devicehub/resources/event/__init__.py
+++ b/ereuse_devicehub/resources/event/__init__.py
@@ -1,7 +1,7 @@
 from typing import Callable, Iterable, Tuple
 
 from ereuse_devicehub.resources.device.sync import Sync
-from ereuse_devicehub.resources.event.schemas import Add, AggregateRate, Benchmark, \
+from ereuse_devicehub.resources.event.schemas import Add, AggregateRate, AppRate, Benchmark, \
     BenchmarkDataStorage, BenchmarkProcessor, BenchmarkProcessorSysbench, BenchmarkRamSysbench, \
     BenchmarkWithRate, EraseBasic, EraseSectors, Event, Install, PhotoboxSystemRate, \
     PhotoboxUserRate, Rate, Remove, Snapshot, Step, StepRandom, StepZero, StressTest, Test, \
@@ -65,6 +65,10 @@ class PhotoboxSystemRateDef(RateDef):
     SCHEMA = PhotoboxSystemRate
 
 
+class AppRateDef(RateDef):
+    SCHEMA = AppRate
+
+
 class InstallDef(EventDef):
     SCHEMA = Install
 
diff --git a/ereuse_devicehub/resources/event/models.py b/ereuse_devicehub/resources/event/models.py
index d26b6f60..5ba10cc0 100644
--- a/ereuse_devicehub/resources/event/models.py
+++ b/ereuse_devicehub/resources/event/models.py
@@ -2,14 +2,6 @@ from collections import Iterable
 from typing import Set, Union
 from uuid import uuid4
 
-from ereuse_devicehub.db import db
-from ereuse_devicehub.resources.device.models import Component, Computer, DataStorage, Device
-from ereuse_devicehub.resources.enums import AppearanceRange, BOX_RATE_3, BOX_RATE_5, Bios, \
-    FunctionalityRange, RATE_NEGATIVE, RATE_POSITIVE, RatingRange, RatingSoftware, \
-    SnapshotExpectedEvents, SnapshotSoftware, TestHardDriveLength
-from ereuse_devicehub.resources.image.models import Image
-from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE, STR_SM_SIZE, Thing
-from ereuse_devicehub.resources.user.models import User
 from flask import g
 from sqlalchemy import BigInteger, Boolean, CheckConstraint, Column, DateTime, Enum as DBEnum, \
     Float, ForeignKey, Interval, JSON, SmallInteger, Unicode, event
@@ -20,6 +12,14 @@ from sqlalchemy.orm import backref, relationship
 from sqlalchemy.orm.events import AttributeEvents as Events
 from sqlalchemy.util import OrderedSet
 
+from ereuse_devicehub.db import db
+from ereuse_devicehub.resources.device.models import Component, Computer, DataStorage, Device
+from ereuse_devicehub.resources.enums import AppearanceRange, BOX_RATE_3, BOX_RATE_5, Bios, \
+    FunctionalityRange, RATE_NEGATIVE, RATE_POSITIVE, RatingRange, RatingSoftware, \
+    SnapshotExpectedEvents, SnapshotSoftware, TestHardDriveLength
+from ereuse_devicehub.resources.image.models import Image
+from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE, STR_SM_SIZE, Thing
+from ereuse_devicehub.resources.user.models import User
 from teal.db import ArrayOfEnum, CASCADE, CASCADE_OWN, INHERIT_COND, POLYMORPHIC_ID, \
     POLYMORPHIC_ON, StrictVersionType, check_range
 
@@ -256,15 +256,18 @@ class StepRandom(Step):
 
 
 class Snapshot(JoinedTableMixin, EventWithOneDevice):
-    uuid = Column(UUID(as_uuid=True), nullable=False, unique=True)
+    uuid = Column(UUID(as_uuid=True), unique=True)
     version = Column(StrictVersionType(STR_SM_SIZE), nullable=False)
     software = Column(DBEnum(SnapshotSoftware), nullable=False)
-    elapsed = Column(Interval, nullable=False)
+    elapsed = Column(Interval)
+    elapsed.comment = """
+        For Snapshots made with Workbench, the total amount of time
+        it took to complete.
+    """
     expected_events = Column(ArrayOfEnum(DBEnum(SnapshotExpectedEvents)))
 
 
 class Install(JoinedTableMixin, EventWithOneDevice):
-    name = Column(Unicode(STR_BIG_SIZE), nullable=False)
     elapsed = Column(Interval, nullable=False)
 
 
@@ -290,6 +293,20 @@ class Rate(JoinedTableMixin, EventWithOneDevice):
     def rating_range(self) -> RatingRange:
         return RatingRange.from_score(self.rating)
 
+    @declared_attr
+    def __mapper_args__(cls):
+        """
+        Defines inheritance.
+
+        From `the guide <http://docs.sqlalchemy.org/en/latest/orm/
+        extensions/declarative/api.html
+        #sqlalchemy.ext.declarative.declared_attr>`_
+        """
+        args = {POLYMORPHIC_ID: cls.t}
+        if cls.t == 'Rate':
+            args[POLYMORPHIC_ON] = cls.type
+        return args
+
 
 class IndividualRate(Rate):
     pass
@@ -319,18 +336,26 @@ class RateAggregateRate(db.Model):
                                primary_key=True)
 
 
-class WorkbenchRate(IndividualRate):
+class ManualRate(IndividualRate):
     id = Column(UUID(as_uuid=True), ForeignKey(Rate.id), primary_key=True)
+    labelling = Column(Boolean)
+    appearance_range = Column(DBEnum(AppearanceRange))
+    functionality_range = Column(DBEnum(FunctionalityRange))
+
+
+class WorkbenchRate(ManualRate):
+    id = Column(UUID(as_uuid=True), ForeignKey(ManualRate.id), primary_key=True)
     processor = Column(Float(decimal_return_scale=2), check_range('processor', *RATE_POSITIVE))
     ram = Column(Float(decimal_return_scale=2), check_range('ram', *RATE_POSITIVE))
     data_storage = Column(Float(decimal_return_scale=2),
                           check_range('data_storage', *RATE_POSITIVE))
     graphic_card = Column(Float(decimal_return_scale=2),
                           check_range('graphic_card', *RATE_POSITIVE))
-    labelling = Column(Boolean)
     bios = Column(DBEnum(Bios))
-    appearance_range = Column(DBEnum(AppearanceRange))
-    functionality_range = Column(DBEnum(FunctionalityRange))
+
+
+class AppRate(ManualRate):
+    pass
 
 
 class PhotoboxRate(IndividualRate):
@@ -369,6 +394,20 @@ class PhotoboxSystemRate(PhotoboxRate):
 class Test(JoinedTableMixin, EventWithOneDevice):
     elapsed = Column(Interval, nullable=False)
 
+    @declared_attr
+    def __mapper_args__(cls):
+        """
+        Defines inheritance.
+
+        From `the guide <http://docs.sqlalchemy.org/en/latest/orm/
+        extensions/declarative/api.html
+        #sqlalchemy.ext.declarative.declared_attr>`_
+        """
+        args = {POLYMORPHIC_ID: cls.t}
+        if cls.t == 'Test':
+            args[POLYMORPHIC_ON] = cls.type
+        return args
+
 
 class TestDataStorage(Test):
     id = Column(UUID(as_uuid=True), ForeignKey(Test.id), primary_key=True)
@@ -396,6 +435,20 @@ class StressTest(Test):
 class Benchmark(JoinedTableMixin, EventWithOneDevice):
     elapsed = Column(Interval)
 
+    @declared_attr
+    def __mapper_args__(cls):
+        """
+        Defines inheritance.
+
+        From `the guide <http://docs.sqlalchemy.org/en/latest/orm/
+        extensions/declarative/api.html
+        #sqlalchemy.ext.declarative.declared_attr>`_
+        """
+        args = {POLYMORPHIC_ID: cls.t}
+        if cls.t == 'Benchmark':
+            args[POLYMORPHIC_ON] = cls.type
+        return args
+
 
 class BenchmarkDataStorage(Benchmark):
     id = Column(UUID(as_uuid=True), ForeignKey(Benchmark.id), primary_key=True)
diff --git a/ereuse_devicehub/resources/event/models.pyi b/ereuse_devicehub/resources/event/models.pyi
index 48923df9..f04c67d3 100644
--- a/ereuse_devicehub/resources/event/models.pyi
+++ b/ereuse_devicehub/resources/event/models.pyi
@@ -139,17 +139,26 @@ class AggregateRate(Rate):
         self.ratings = ...  # type: Set[IndividualRate]
 
 
-class WorkbenchRate(IndividualRate):
+class ManualRate(IndividualRate):
+    def __init__(self, **kwargs) -> None:
+        super().__init__(**kwargs)
+        self.labelling = ...  # type: bool
+        self.appearance_range = ...  # type: AppearanceRange
+        self.functionality_range = ...  # type: FunctionalityRange
+
+
+class WorkbenchRate(ManualRate):
     def __init__(self, **kwargs) -> None:
         super().__init__(**kwargs)
         self.processor = ...  # type: float
         self.ram = ...  # type: float
         self.data_storage = ...  # type: float
         self.graphic_card = ...  # type: float
-        self.labelling = ...  # type: bool
         self.bios = ...  # type: Bios
-        self.appearance_range = ...  # type: AppearanceRange
-        self.functionality_range = ...  # type: FunctionalityRange
+
+
+class AppRate(ManualRate):
+    pass
 
 
 class PhotoboxRate(IndividualRate):
diff --git a/ereuse_devicehub/resources/event/schemas.py b/ereuse_devicehub/resources/event/schemas.py
index 91c6d81e..4a478400 100644
--- a/ereuse_devicehub/resources/event/schemas.py
+++ b/ereuse_devicehub/resources/event/schemas.py
@@ -1,3 +1,10 @@
+from flask import current_app as app
+from marshmallow import ValidationError, validates_schema
+from marshmallow.fields import Boolean, DateTime, Float, Integer, List, Nested, String, TimeDelta, \
+    UUID
+from marshmallow.validate import Length, Range
+from marshmallow_enum import EnumField
+
 from ereuse_devicehub.marshmallow import NestedOn
 from ereuse_devicehub.resources.device.schemas import Component, Device
 from ereuse_devicehub.resources.enums import AppearanceRange, Bios, FunctionalityRange, \
@@ -6,13 +13,6 @@ from ereuse_devicehub.resources.event import models as m
 from ereuse_devicehub.resources.models import STR_BIG_SIZE, STR_SIZE
 from ereuse_devicehub.resources.schemas import Thing
 from ereuse_devicehub.resources.user.schemas import User
-from flask import current_app as app
-from marshmallow import ValidationError, validates_schema
-from marshmallow.fields import Boolean, DateTime, Float, Integer, List, Nested, String, TimeDelta, \
-    UUID
-from marshmallow.validate import Length, Range
-from marshmallow_enum import EnumField
-
 from teal.marshmallow import Version
 from teal.resource import Schema
 
@@ -124,7 +124,7 @@ class PhotoboxRate(IndividualRate):
     # todo Image
 
 
-class PhotoboxUserRate(PhotoboxRate):
+class PhotoboxUserRate(IndividualRate):
     assembling = Integer()
     parts = Integer()
     buttons = Integer()
@@ -135,18 +135,11 @@ class PhotoboxUserRate(PhotoboxRate):
     dirt = Integer()
 
 
-class PhotoboxSystemRate(PhotoboxRate):
+class PhotoboxSystemRate(IndividualRate):
     pass
 
 
-class WorkbenchRate(IndividualRate):
-    processor = Float()
-    ram = Float()
-    data_storage = Float()
-    graphic_card = Float()
-    labelling = Boolean(description='Sets if there are labels stuck that should be removed.')
-    bios = EnumField(Bios, description='How difficult it has been to set the bios to '
-                                       'boot from the network.')
+class ManualRate(IndividualRate):
     appearance_range = EnumField(AppearanceRange,
                                  required=True,
                                  data_key='appearanceRange',
@@ -156,6 +149,20 @@ class WorkbenchRate(IndividualRate):
                                     required=True,
                                     data_key='functionalityRange',
                                     description='Grades the defects of a device that affect its usage.')
+    labelling = Boolean(description='Sets if there are labels stuck that should be removed.')
+
+
+class AppRate(ManualRate):
+    pass
+
+
+class WorkbenchRate(ManualRate):
+    processor = Float()
+    ram = Float()
+    data_storage = Float()
+    graphic_card = Float()
+    bios = EnumField(Bios, description='How difficult it has been to set the bios to '
+                                       'boot from the network.')
 
 
 class Install(EventWithOneDevice):
@@ -172,7 +179,7 @@ class Snapshot(EventWithOneDevice):
 
     See docs for more info.
     """
-    uuid = UUID(required=True)
+    uuid = UUID()
     software = EnumField(SnapshotSoftware,
                          required=True,
                          description='The software that generated this Snapshot.')
@@ -185,7 +192,7 @@ class Snapshot(EventWithOneDevice):
                                        'the async Snapshot.')
 
     device = NestedOn(Device)
-    elapsed = TimeDelta(precision=TimeDelta.SECONDS, required=True)
+    elapsed = TimeDelta(precision=TimeDelta.SECONDS)
     components = NestedOn(Component,
                           many=True,
                           description='A list of components that are inside of the device'
@@ -206,10 +213,29 @@ class Snapshot(EventWithOneDevice):
     @validates_schema
     def validate_components_only_workbench(self, data: dict):
         if data['software'] != SnapshotSoftware.Workbench:
-            if data['components'] is not None:
+            if data.get('components', None) is not None:
                 raise ValidationError('Only Workbench can add component info',
                                       field_names=['components'])
 
+    @validates_schema
+    def validate_only_workbench_fields(self, data: dict):
+        """Ensures workbench has ``elapsed`` and ``uuid`` and no others."""
+        # todo test
+        if data['software'] == SnapshotSoftware.Workbench:
+            if not data.get('uuid', None):
+                raise ValidationError('Snapshots from Workbench must have uuid',
+                                      field_names=['uuid'])
+            if not data.get('elapsed', None):
+                raise ValidationError('Snapshots from Workbench must have elapsed',
+                                      field_names=['elapsed'])
+        else:
+            if data.get('uuid', None):
+                raise ValidationError('Only Snapshots from Workbench can have uuid',
+                                      field_names=['uuid'])
+            if data.get('elapsed', None):
+                raise ValidationError('Only Snapshots from Workbench can have elapsed',
+                                      field_names=['elapsed'])
+
 
 class Test(EventWithOneDevice):
     elapsed = TimeDelta(precision=TimeDelta.SECONDS, required=True)
diff --git a/ereuse_devicehub/resources/event/views.py b/ereuse_devicehub/resources/event/views.py
index 14067471..c38e4f9e 100644
--- a/ereuse_devicehub/resources/event/views.py
+++ b/ereuse_devicehub/resources/event/views.py
@@ -8,7 +8,8 @@ from sqlalchemy.util import OrderedSet
 from ereuse_devicehub.db import db
 from ereuse_devicehub.resources.device.models import Component, Computer
 from ereuse_devicehub.resources.enums import RatingSoftware, SnapshotSoftware
-from ereuse_devicehub.resources.event.models import Event, Snapshot, TestDataStorage, WorkbenchRate
+from ereuse_devicehub.resources.event.models import Event, ManualRate, Snapshot, TestDataStorage, \
+    WorkbenchRate
 from teal.resource import View
 
 
@@ -40,14 +41,15 @@ class SnapshotView(View):
 
         # Remove new events from devices so they don't interfere with sync
         events_device = set(e for e in device.events_one)
-        events_components = tuple(set(e for e in component.events_one) for component in components)
         device.events_one.clear()
-        for component in components:
-            component.events_one.clear()
+        if components:
+            events_components = tuple(set(e for e in c.events_one) for c in components)
+            for component in components:
+                component.events_one.clear()
 
         # noinspection PyArgumentList
         assert not device.events_one
-        assert all(not c.events_one for c in components)
+        assert all(not c.events_one for c in components) if components else True
         db_device, remove_events = self.resource_def.sync.run(device, components)
         snapshot.device = db_device
         snapshot.events |= remove_events | events_device
@@ -56,19 +58,21 @@ class SnapshotView(View):
         ordered_components = OrderedSet(x for x in snapshot.components)
 
         for event in events_device:
+            if isinstance(event, ManualRate):
+                event.algorithm_software = RatingSoftware.Ereuse
+                event.algorithm_version = StrictVersion('1.0')
             if isinstance(event, WorkbenchRate):
                 # todo process workbench rate
                 event.data_storage = 2
                 event.graphic_card = 4
                 event.processor = 1
-                event.algorithm_software = RatingSoftware.Ereuse
-                event.algorithm_version = StrictVersion('1.0')
 
         # Add the new events to the db-existing devices and components
         db_device.events_one |= events_device
-        for component, events in zip(ordered_components, events_components):
-            component.events_one |= events
-            snapshot.events |= events
+        if components:
+            for component, events in zip(ordered_components, events_components):
+                component.events_one |= events
+                snapshot.events |= events
 
         db.session.add(snapshot)
         db.session.commit()
diff --git a/ereuse_devicehub/resources/user/__init__.py b/ereuse_devicehub/resources/user/__init__.py
index f3990e5f..82162776 100644
--- a/ereuse_devicehub/resources/user/__init__.py
+++ b/ereuse_devicehub/resources/user/__init__.py
@@ -1,7 +1,6 @@
 from click import argument, option
 from flask import current_app as app
 
-from ereuse_devicehub import devicehub
 from ereuse_devicehub.db import db
 from ereuse_devicehub.resources.user.models import Organization, User
 from ereuse_devicehub.resources.user.schemas import User as UserS
@@ -16,7 +15,7 @@ class UserDef(Resource):
     ID_CONVERTER = Converters.uuid
     AUTH = True
 
-    def __init__(self, app: 'devicehub.Devicehub', import_name=__package__, static_folder=None,
+    def __init__(self, app, import_name=__package__, static_folder=None,
                  static_url_path=None, template_folder=None, url_prefix=None, subdomain=None,
                  url_defaults=None, root_path=None):
         cli_commands = ((self.create_user, 'create-user'),)
diff --git a/setup.py b/setup.py
index 76cc7ae8..4db038b0 100644
--- a/setup.py
+++ b/setup.py
@@ -11,14 +11,16 @@ setup(
     include_package_data=True,
     description='A system to manage devices focusing reuse.',
     install_requires=[
-        'teal>=0.2.0a1',
+        'teal>=0.2.0a2',
         'marshmallow_enum',
-        'ereuse-utils [Naming]>=0.3.0b1',
+        'ereuse-utils [Naming]>=0.3.0b2',
         'psycopg2-binary',
         'sqlalchemy-utils',
         'requests',
         'requests-toolbelt',
-        'hashids'
+        'hashids',
+        'tqdm',
+        'click-spinner'
     ],
     tests_requires=[
         'pytest',
diff --git a/tests/conftest.py b/tests/conftest.py
index 09a33485..3aec3c61 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -53,11 +53,12 @@ def app_context(app: Devicehub):
 def user(app: Devicehub) -> UserClient:
     """Gets a client with a logged-in dummy user."""
     with app.app_context():
-        user = create_user()
+        password = 'foo'
+        user = create_user(password=password)
         client = UserClient(application=app,
                             response_wrapper=app.response_class,
                             email=user.email,
-                            password='foo')
+                            password=password)
         client.user, _ = client.login(client.email, client.password)
         return client
 
diff --git a/tests/files/computer-monitor.snapshot.yaml b/tests/files/computer-monitor.snapshot.yaml
new file mode 100644
index 00000000..aefc5817
--- /dev/null
+++ b/tests/files/computer-monitor.snapshot.yaml
@@ -0,0 +1,17 @@
+type: Snapshot
+software: AndroidApp
+version: '1.0'
+device:
+  type: ComputerMonitor
+  technology: LCD
+  manufacturer: Dell
+  model: 1707FPF
+  serialNumber: CN0FP446728728541C8S
+  resolutionWidth: 1920
+  resolutionHeight: 1080
+  size: 21.5
+  events:
+    - type: AppRate
+      appearanceRange: A
+      functionalityRange: C
+      labelling: False
diff --git a/tests/test_device.py b/tests/test_device.py
index 4a5f11b3..67a6e7f7 100644
--- a/tests/test_device.py
+++ b/tests/test_device.py
@@ -10,11 +10,12 @@ from ereuse_devicehub.client import UserClient
 from ereuse_devicehub.db import db
 from ereuse_devicehub.devicehub import Devicehub
 from ereuse_devicehub.resources.device.exceptions import NeedsId
-from ereuse_devicehub.resources.device.models import Component, Computer, Desktop, Device, \
-    GraphicCard, Laptop, Microtower, Motherboard, NetworkAdapter
+from ereuse_devicehub.resources.device.models import Component, Computer, ComputerMonitor, Desktop, \
+    Device, GraphicCard, Laptop, Microtower, Motherboard, NetworkAdapter
 from ereuse_devicehub.resources.device.schemas import Device as DeviceS
 from ereuse_devicehub.resources.device.sync import MismatchBetweenTags, MismatchBetweenTagsAndHid, \
     Sync
+from ereuse_devicehub.resources.enums import ComputerMonitorTechnologies
 from ereuse_devicehub.resources.event.models import Remove, Test
 from ereuse_devicehub.resources.tag.model import Tag
 from ereuse_devicehub.resources.user import User
@@ -396,3 +397,16 @@ def test_get_devices(app: Devicehub, user: UserClient):
     assert tuple(d['id'] for d in devices) == (1, 2, 3, 4, 5)
     assert tuple(d['type'] for d in devices) == ('Desktop', 'Microtower',
                                                  'Laptop', 'NetworkAdapter', 'GraphicCard')
+
+
+@pytest.mark.usefixtures('app_context')
+def test_computer_monitor():
+    m = ComputerMonitor(technology=ComputerMonitorTechnologies.LCD,
+                        manufacturer='foo',
+                        model='bar',
+                        serial_number='foo-bar',
+                        resolution_width=1920,
+                        resolution_height=1080,
+                        size=14.5)
+    db.session.add(m)
+    db.session.commit()
diff --git a/tests/test_snapshot.py b/tests/test_snapshot.py
index f41b73ad..14fe80e0 100644
--- a/tests/test_snapshot.py
+++ b/tests/test_snapshot.py
@@ -69,11 +69,13 @@ def snapshot_and_check(user: UserClient,
             assert event['type'] != 'Receive', 'All Remove events must be before the Add ones'
     assert input_snapshot['device']
     assert_similar_device(input_snapshot['device'], snapshot['device'])
-    assert_similar_components(input_snapshot['components'], snapshot['components'])
+    if input_snapshot.get('components', None):
+        assert_similar_components(input_snapshot['components'], snapshot['components'])
     assert all(c['parent'] == snapshot['device']['id'] for c in snapshot['components']), \
         'Components must be in their parent'
     if perform_second_snapshot:
-        input_snapshot['uuid'] = uuid4()
+        if 'uuid' in input_snapshot:
+            input_snapshot['uuid'] = uuid4()
         return snapshot_and_check(user, input_snapshot, event_types, perform_second_snapshot=False)
     else:
         return snapshot
@@ -330,3 +332,24 @@ def test_erase(user: UserClient):
         assert step['secureRandomSteps'] == 1
         assert step['cleanWithZeros'] is True
         assert 'num' not in step
+
+
+def test_snapshot_computer_monitor(user: UserClient):
+    s = file('computer-monitor.snapshot')
+    snapshot_and_check(user, s, event_types=('AppRate',))
+
+
+def test_snapshot_components_none():
+    """
+    Tests that a snapshot without components does not
+    remove them from the computer.
+    """
+    # todo test
+    pass
+
+
+def test_snapshot_components_empty():
+    """
+    Tests that a snapshot whose components are an empty list remove
+    all its components.
+    """