diff --git a/src/models/Address.ts b/src/models/Address.ts
new file mode 100644
index 0000000..59e6570
--- /dev/null
+++ b/src/models/Address.ts
@@ -0,0 +1,87 @@
+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPostalCode,
+  IsString,
+} from "class-validator";
+import { Participant } from "./Participant";
+import { RunnerOrganisation } from "./RunnerOrganisation";
+
+/**
+ * Defines a address (to be used for contact information).
+*/
+@Entity()
+export class Address {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The address's description.
+   */
+  @Column()
+  @IsString()
+  @IsOptional()
+  description?: string;
+
+  /**
+   * The address's first line.
+   * Containing the street and house number.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  address1: string;
+
+  /**
+   * The address's second line.
+   * Containing optional information.
+   */
+  @Column()
+  @IsString()
+  @IsOptional()
+  address2?: string;
+
+  /**
+   * The address's postal code.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  @IsPostalCode("DE")
+  postalcode: string;
+
+  /**
+   * The address's city.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  city: string;
+
+  /**
+   * The address's country.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  country: string;
+
+  /**
+   * Used to link the address to participants.
+   */
+  @OneToMany(() => Participant, participant => participant.address)
+  participants: Participant[];
+
+  /**
+   * Used to link the address to runner groups.
+   */
+  @OneToMany(() => RunnerOrganisation, group => group.address)
+  groups: RunnerOrganisation[];
+}
diff --git a/src/models/DistanceDonation.ts b/src/models/DistanceDonation.ts
new file mode 100644
index 0000000..878f8cb
--- /dev/null
+++ b/src/models/DistanceDonation.ts
@@ -0,0 +1,41 @@
+import { Entity, Column, ManyToOne } from "typeorm";
+import { IsInt, IsNotEmpty, IsPositive,} from "class-validator";
+import { Donation } from "./Donation";
+import { Runner } from "./Runner";
+
+/**
+ * Defines a distance based donation.
+ * Here people donate a certain amout per kilometer
+*/
+@Entity()
+export class DistanceDonation extends Donation {
+  /**
+   * The runner associated.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => Runner, runner => runner.distanceDonations)
+  runner: Runner;
+
+  /**
+   * The amount the donor set to be donated per kilometer that the runner ran.
+   */
+  @Column()
+  @IsInt()
+  @IsPositive()
+  amountPerDistance: number;
+
+  /**
+   * The donation's amount in cents (or whatever your currency's smallest unit is.).
+   * The exact implementation may differ for each type of donation.
+   */
+  @IsInt()
+  public get amount(): number {
+    let calculatedAmount = -1;
+    try {
+      calculatedAmount = this.amountPerDistance * this.runner.distance;
+    } catch (error) {
+      throw error;
+    }
+    return calculatedAmount;
+  }
+}
diff --git a/src/models/Donation.ts b/src/models/Donation.ts
new file mode 100644
index 0000000..7143c99
--- /dev/null
+++ b/src/models/Donation.ts
@@ -0,0 +1,35 @@
+import { PrimaryGeneratedColumn, Column, ManyToOne, Entity } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+} from "class-validator";
+import { Participant } from "./Participant";
+
+/**
+ * Defines the donation interface.
+*/
+@Entity()
+export abstract class Donation {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The donations's donor.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => Participant, donor => donor.donations)
+  donor: Participant;
+
+  /**
+   * The donation's amount in cents (or whatever your currency's smallest unit is.).
+   * The exact implementation may differ for each type of donation.
+   */
+  abstract amount: number;
+}
\ No newline at end of file
diff --git a/src/models/Donor.ts b/src/models/Donor.ts
new file mode 100644
index 0000000..5d0af07
--- /dev/null
+++ b/src/models/Donor.ts
@@ -0,0 +1,17 @@
+import { Entity, Column } from "typeorm";
+import { IsBoolean } from "class-validator";
+import { Participant } from "./Participant";
+
+/**
+ * Defines a donor.
+*/
+@Entity()
+export class Donor extends Participant {
+  /**
+   * Does this donor need a receipt?.
+   * Default: false
+   */
+  @Column()
+  @IsBoolean()
+  receiptNeeded: boolean = false;
+}
\ No newline at end of file
diff --git a/src/models/FixedDonation.ts b/src/models/FixedDonation.ts
new file mode 100644
index 0000000..e429ddf
--- /dev/null
+++ b/src/models/FixedDonation.ts
@@ -0,0 +1,18 @@
+import { Entity, Column } from "typeorm";
+import { IsInt, IsPositive,} from "class-validator";
+import { Donation } from "./Donation";
+
+/**
+ * Defines a fixed donation.
+*/
+@Entity()
+export class FixedDonation extends Donation {
+
+  /**
+   * The donation's amount in cents (or whatever your currency's smallest unit is.).
+   */
+  @Column()
+  @IsInt()
+  @IsPositive()
+  amount: number;
+}
\ No newline at end of file
diff --git a/src/models/GroupContact.ts b/src/models/GroupContact.ts
new file mode 100644
index 0000000..58a07a7
--- /dev/null
+++ b/src/models/GroupContact.ts
@@ -0,0 +1,89 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, ManyToOne, Entity } from "typeorm";
+import {
+  IsEmail,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPhoneNumber,
+  IsString,
+} from "class-validator";
+import { Address } from "./Address";
+import { Donation } from "./Donation";
+import { RunnerGroup } from "./RunnerGroup";
+
+/**
+ * Defines a group's contact.
+*/
+@Entity()
+export class GroupContact {
+    /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The contact's first name.
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  firstname: string;
+
+  /**
+   * The contact's middle name.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  middlename?: string;
+
+  /**
+   * The contact's last name.
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  lastname: string;
+
+  /**
+   * The contact's address.
+   * Optional
+   */
+  @IsOptional()
+  @ManyToOne(() => Address, address => address.participants)
+  address?: Address;
+
+  /**
+   * The contact's phone number.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsPhoneNumber("DE")
+  phone?: string;
+
+  /**
+   * The contact's email address.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsEmail()
+  email?: string;
+
+  /**
+   * Used to link the contact as the donor of a donation.
+   */
+  @OneToMany(() => Donation, donation => donation.donor)
+  donations: Donation[];
+
+  /**
+    * Used to link runners to donations.
+    */
+  @OneToMany(() => RunnerGroup, group => group.contact)
+  groups: RunnerGroup[];
+}
\ No newline at end of file
diff --git a/src/models/Participant.ts b/src/models/Participant.ts
new file mode 100644
index 0000000..2f4327b
--- /dev/null
+++ b/src/models/Participant.ts
@@ -0,0 +1,82 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, ManyToOne, Entity } from "typeorm";
+import {
+  IsEmail,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPhoneNumber,
+  IsString,
+} from "class-validator";
+import { Address } from "./Address";
+import { Donation } from "./Donation";
+
+/**
+ * Defines the participant interface.
+*/
+@Entity()
+export abstract class Participant {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The participant's first name.
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  firstname: string;
+
+  /**
+   * The participant's middle name.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  middlename?: string;
+
+  /**
+   * The participant's last name.
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  lastname: string;
+
+  /**
+   * The participant's address.
+   * Optional
+   */
+  @IsOptional()
+  @ManyToOne(() => Address, address => address.participants)
+  address?: Address;
+
+  /**
+   * The participant's phone number.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsPhoneNumber("DE")
+  phone?: string;
+
+  /**
+   * The participant's email address.
+   * Optional
+   */
+  @Column()
+  @IsOptional()
+  @IsEmail()
+  email?: string;
+
+  /**
+   * Used to link the participant as the donor of a donation.
+   */
+  @OneToMany(() => Donation, donation => donation.donor)
+  donations: Donation[];
+}
\ No newline at end of file
diff --git a/src/models/Permission.ts b/src/models/Permission.ts
new file mode 100644
index 0000000..e9b049b
--- /dev/null
+++ b/src/models/Permission.ts
@@ -0,0 +1,50 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, Entity, ManyToOne } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+import { User } from './User';
+import { UserGroup } from './UserGroup';
+/**
+ * Defines the Permission interface.
+*/
+@Entity()
+export abstract class Permission {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * users
+   */
+  @OneToMany(() => User, user => user.permissions)
+  users: User[]
+
+  /**
+   * groups
+   */
+  @OneToMany(() => UserGroup, group => group.permissions)
+  groups: UserGroup[]
+
+  /**
+   * The target
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  target: string;
+
+  /**
+   * The action type
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  action: string;
+}
\ No newline at end of file
diff --git a/src/models/Runner.ts b/src/models/Runner.ts
new file mode 100644
index 0000000..3a8532a
--- /dev/null
+++ b/src/models/Runner.ts
@@ -0,0 +1,44 @@
+import { Entity, Column, OneToMany, ManyToOne } from "typeorm";
+import { IsInt, IsNotEmpty,} from "class-validator";
+import { Participant } from "./Participant";
+import { RunnerGroup } from "./RunnerGroup";
+import { DistanceDonation } from "./DistanceDonation";
+import { RunnerCard } from "./RunnerCard";
+import { Scan } from "./Scan";
+
+/**
+ * Defines a runner.
+*/
+@Entity()
+export class Runner extends Participant {
+  /**
+   * The runner's associated group.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => RunnerGroup, group => group.runners)
+  group: RunnerGroup;
+  
+  /**
+   * Used to link runners to donations.
+   */
+  @OneToMany(() => DistanceDonation, distanceDonation => distanceDonation.runner)
+  distanceDonations: DistanceDonation[];
+
+  /**
+   * Used to link runners to cards.
+   */
+  @OneToMany(() => RunnerCard, card => card.runner)
+  cards: RunnerCard[];
+
+  /**
+   * Used to link runners to a scans
+   */
+  @OneToMany(() => Scan, scan => scan.runner)
+  scans: Scan[];
+
+  @IsInt() 
+  public get distance() : number {
+    return this.scans.filter(scan => scan.valid === true).reduce((sum, current) => sum + current.distance, 0);
+  }
+  
+}
diff --git a/src/models/RunnerCard.ts b/src/models/RunnerCard.ts
new file mode 100644
index 0000000..f978d0c
--- /dev/null
+++ b/src/models/RunnerCard.ts
@@ -0,0 +1,56 @@
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, OneToMany } from "typeorm";
+import {
+  IsBoolean,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+import { Runner } from "./Runner";
+import { TrackScan } from "./TrackScan";
+
+/**
+ * Defines a card that can be scanned via a scanner station.
+*/
+@Entity()
+export class RunnerCard {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The runner that is currently associated with this card.
+   */
+  @IsOptional()
+  @ManyToOne(() => Runner, runner => runner.cards)
+  runner: Runner;
+
+  /**
+   * The card's code.
+   * This has to be able to being converted to something barcode compatible.
+   * Probably gonna be autogenerated.
+   */
+  @Column()
+  @IsString()
+  @IsNotEmpty()
+  //TODO: Generate this
+  code: string;
+
+  /**
+   * Is the card enabled (for fraud reasons)?
+   * Default: true
+   */
+  @Column()
+  @IsBoolean()
+  enabled: boolean = true;
+
+  /**
+   * Used to link cards to a track scans.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
+}
diff --git a/src/models/RunnerGroup.ts b/src/models/RunnerGroup.ts
new file mode 100644
index 0000000..a7c199b
--- /dev/null
+++ b/src/models/RunnerGroup.ts
@@ -0,0 +1,46 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, ManyToOne, Entity } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+import { GroupContact } from "./GroupContact";
+import { Runner } from "./Runner";
+import { RunnerTeam } from "./RunnerTeam";
+
+/**
+ * Defines the runnerGroup interface.
+*/
+@Entity()
+export abstract class RunnerGroup {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The group's first name.
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  name: string;
+
+  /**
+   * The group's contact.
+   * Optional
+   */
+  @IsOptional()
+  @ManyToOne(() => GroupContact, contact => contact.groups)
+  contact?: GroupContact;
+
+  /**
+   * Used to link runners to a runner group.
+   */
+  @OneToMany(() => Runner, runner => runner.group)
+  runners: Runner[];
+}
\ No newline at end of file
diff --git a/src/models/RunnerOrganisation.ts b/src/models/RunnerOrganisation.ts
new file mode 100644
index 0000000..958b363
--- /dev/null
+++ b/src/models/RunnerOrganisation.ts
@@ -0,0 +1,26 @@
+import { Entity, Column, ManyToOne, OneToMany } from "typeorm";
+import { IsOptional,} from "class-validator";
+import { RunnerGroup } from "./RunnerGroup";
+import { Address } from "./Address";
+import { RunnerTeam } from "./RunnerTeam";
+
+/**
+ * Defines a runner organisation (business or school for example).
+*/
+@Entity()
+export class RunnerOrganisation extends RunnerGroup {
+
+  /**
+   * The organisations's address.
+   * Optional
+   */
+  @IsOptional()
+  @ManyToOne(() => Address, address => address.groups)
+  address?: Address;
+
+    /**
+   * Used to link teams to runner groups.
+   */
+  @OneToMany(() => RunnerTeam, team => team.parentGroup)
+  teams: RunnerTeam[];
+}
\ No newline at end of file
diff --git a/src/models/RunnerTeam.ts b/src/models/RunnerTeam.ts
new file mode 100644
index 0000000..f12c5eb
--- /dev/null
+++ b/src/models/RunnerTeam.ts
@@ -0,0 +1,19 @@
+import { Entity, Column, ManyToOne } from "typeorm";
+import { IsNotEmpty } from "class-validator";
+import { RunnerGroup } from "./RunnerGroup";
+import { RunnerOrganisation } from "./RunnerOrganisation";
+
+/**
+ * Defines a runner team (class or deparment for example).
+*/
+@Entity()
+export class RunnerTeam extends RunnerGroup {
+
+  /**
+   * The team's parent group.
+   * Optional
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => RunnerOrganisation, org => org.teams)
+  parentGroup?: RunnerOrganisation;
+}
\ No newline at end of file
diff --git a/src/models/Scan.ts b/src/models/Scan.ts
new file mode 100644
index 0000000..055e94b
--- /dev/null
+++ b/src/models/Scan.ts
@@ -0,0 +1,45 @@
+import { PrimaryGeneratedColumn, Column, ManyToOne, Entity } from "typeorm";
+import {
+  IsBoolean,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+} from "class-validator";
+import { Runner } from "./Runner";
+
+/**
+ * Defines the scan interface.
+*/
+@Entity()
+export abstract class Scan {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The associated runner.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => Runner, runner => runner.scans)
+  runner: Runner;
+
+  /**
+   * The scan's distance in meters.
+   */
+  @IsInt()
+  @IsPositive()
+  abstract distance: number;
+
+    /**
+   * Is the scan valid (for fraud reasons).
+   * Default: true
+   */
+  @Column()
+  @IsBoolean()
+  valid: boolean = true;
+}
diff --git a/src/models/ScanStation.ts b/src/models/ScanStation.ts
new file mode 100644
index 0000000..4415ebc
--- /dev/null
+++ b/src/models/ScanStation.ts
@@ -0,0 +1,61 @@
+import { Entity, PrimaryGeneratedColumn, Column, ManyToOne, OneToMany } from "typeorm";
+import {
+  IsBoolean,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+import { Track } from "./Track";
+import { TrackScan } from "./TrackScan";
+
+/**
+ * ScannerStations have the ability to create scans for specific tracks.
+*/
+@Entity()
+export class ScanStation {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+   * The station's description.
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  description: string;
+
+  /**
+   * The track this station is associated with.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => Track, track => track.stations)
+  track: Track;
+
+  /**
+   * The station's api key.
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  key: string;
+
+  /**
+   * Is the station enabled (for fraud reasons)?
+   * Default: true
+   */
+  @Column()
+  @IsBoolean()
+  enabled: boolean = true;
+
+  /**
+   * Used to link track scans to a scan station.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
+}
diff --git a/src/models/Track.ts b/src/models/Track.ts
index ea09063..eda6def 100644
--- a/src/models/Track.ts
+++ b/src/models/Track.ts
@@ -1,4 +1,4 @@
-import { Entity, PrimaryGeneratedColumn, Column } from "typeorm";
+import { Entity, PrimaryGeneratedColumn, Column, OneToMany } from "typeorm";
 import {
   IsInt,
   IsNotEmpty,
@@ -6,6 +6,8 @@ import {
   IsPositive,
   IsString,
 } from "class-validator";
+import { ScanStation } from "./ScanStation";
+import { TrackScan } from "./TrackScan";
 
 /**
  * Defines a track of given length.
@@ -29,10 +31,22 @@ export class Track {
   name: string;
 
   /**
-   * The track's length in meters.
+   * The track's length/distance in meters.
    */
   @Column()
   @IsInt()
   @IsPositive()
-  length: number;
+  distance: number;
+
+  /**
+   * Used to link scan stations to track.
+   */
+  @OneToMany(() => ScanStation, station => station.track)
+  stations: ScanStation[];
+
+  /**
+   * Used to link track scans to a track.
+   */
+  @OneToMany(() => TrackScan, scan => scan.track)
+  scans: TrackScan[];
 }
diff --git a/src/models/TrackScan.ts b/src/models/TrackScan.ts
new file mode 100644
index 0000000..ce35ee8
--- /dev/null
+++ b/src/models/TrackScan.ts
@@ -0,0 +1,58 @@
+import { PrimaryGeneratedColumn, Column, ManyToOne, Entity } from "typeorm";
+import {
+  IsBoolean,
+  IsDateString,
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsPositive,
+} from "class-validator";
+import { Scan } from "./Scan";
+import { Runner } from "./Runner";
+import { Track } from "./Track";
+import { RunnerCard } from "./RunnerCard";
+import { ScanStation } from "./ScanStation";
+
+/**
+ * Defines the scan interface.
+*/
+@Entity()
+export class TrackScan extends Scan {
+  /**
+   * The associated track.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => Track, track => track.scans)
+  track: Track;
+
+  /**
+   * The associated card.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => RunnerCard, card => card.scans)
+  card: RunnerCard;
+
+  /**
+   * The scanning station.
+   */
+  @IsNotEmpty()
+  @ManyToOne(() => ScanStation, station => station.scans)
+  station: ScanStation;
+
+  /**
+   * The scan's distance in meters.
+   */
+  @IsInt()
+  @IsPositive()
+  public get distance(): number {
+    return this.track.distance;
+  }
+
+  /**
+   * The scan's creation timestamp.
+   */
+  @Column()
+  @IsDateString()
+  @IsNotEmpty()
+  timestamp: string;
+}
diff --git a/src/models/User.ts b/src/models/User.ts
new file mode 100644
index 0000000..d946500
--- /dev/null
+++ b/src/models/User.ts
@@ -0,0 +1,109 @@
+import { Entity, Column, OneToMany, ManyToOne, PrimaryGeneratedColumn, Generated, Unique, JoinTable, ManyToMany } from "typeorm";
+import { IsBoolean, IsEmail, IsInt, IsNotEmpty, IsOptional, IsString, isUUID, } from "class-validator";
+import { UserGroup } from './UserGroup';
+import { Permission } from './Permission';
+
+/**
+ * Defines a admin user.
+*/
+@Entity()
+export class User {
+  /**
+     * autogenerated unique id (primary key).
+     */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+     * autogenerated uuid
+     */
+  @IsOptional()
+  @IsInt()
+  @Generated("uuid")
+  uuid: string;
+
+  /**
+     * user email
+     */
+  @IsEmail()
+  email: string;
+
+  /**
+     * username
+     */
+  @IsString()
+  username: string;
+
+  /**
+     * firstname
+     */
+  @IsString()
+  @IsNotEmpty()
+  firstname: string;
+
+  /**
+     * middlename
+     */
+  @IsString()
+  @IsOptional()
+  middlename: string;
+
+  /**
+     * lastname
+     */
+  @IsString()
+  @IsNotEmpty()
+  lastname: string;
+
+  /**
+     * password
+     */
+  @IsString()
+  @IsNotEmpty()
+  password: string;
+
+  /**
+     * permissions
+     */
+  @ManyToOne(() => Permission, permission => permission.users)
+  permissions: Permission[];
+
+  /**
+     * groups
+     */
+  @ManyToMany(() => UserGroup)
+  @JoinTable()
+  groups: UserGroup[];
+
+  /**
+     * is user enabled?
+     */
+  @IsBoolean()
+  enabled: boolean;
+
+  /**
+     * jwt refresh count
+     */
+  @IsInt()
+  @Column({ default: 1 })
+  refreshTokenCount: number;
+
+  /**
+     * profilepic
+     */
+  @IsString()
+  profilepic: string;
+
+  /**
+   * calculate all permissions
+   */
+  public get calc_permissions(): Permission[] {
+    let final_permissions = this.groups.forEach((permission) => {
+      console.log(permission);
+    })
+    // TODO: add user permissions on top of group permissions + return
+    return []
+  }
+}
diff --git a/src/models/UserAction.ts b/src/models/UserAction.ts
new file mode 100644
index 0000000..7f6dc43
--- /dev/null
+++ b/src/models/UserAction.ts
@@ -0,0 +1,48 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, Entity } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+
+/**
+ * Defines the UserAction interface.
+*/
+@Entity()
+export class UserAction {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  // TODO:
+  // user: relation
+
+  /**
+   * The actions's target (e.g. Track#2)
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  target: string;
+
+  /**
+   * The actions's action (e.g. UPDATE)
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  action: string;
+
+  /**
+   * The description of change (before-> after; e.g. distance:15->17)
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  changed: string;
+}
\ No newline at end of file
diff --git a/src/models/UserGroup.ts b/src/models/UserGroup.ts
new file mode 100644
index 0000000..5a19713
--- /dev/null
+++ b/src/models/UserGroup.ts
@@ -0,0 +1,44 @@
+import { PrimaryGeneratedColumn, Column, OneToMany, Entity, ManyToOne } from "typeorm";
+import {
+  IsInt,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from "class-validator";
+import { Permission } from "./Permission";
+
+/**
+ * Defines the UserGroup interface.
+*/
+@Entity()
+export abstract class UserGroup {
+  /**
+   * Autogenerated unique id (primary key).
+   */
+  @PrimaryGeneratedColumn()
+  @IsOptional()
+  @IsInt()
+  id: number;
+
+  /**
+     * permissions
+     */
+  @ManyToOne(() => Permission, permission => permission.groups)
+  permissions: Permission[];
+
+  /**
+   * The group's name
+   */
+  @Column()
+  @IsNotEmpty()
+  @IsString()
+  name: string;
+
+  /**
+   * The group's description
+   */
+  @Column()
+  @IsOptional()
+  @IsString()
+  description: string;
+}
\ No newline at end of file