diff --git a/backend/typescript/constants.ts b/backend/typescript/constants.ts
new file mode 100644
index 0000000..ffc0146
--- /dev/null
+++ b/backend/typescript/constants.ts
@@ -0,0 +1,2 @@
+export const MIN_BEHAVIOUR_LEVEL = 1;
+export const MAX_BEHAVIOUR_LEVEL = 4;
diff --git a/backend/typescript/migrations/2024.10.22T19.38.07.create-behaviour-level-details-table.ts b/backend/typescript/migrations/2024.10.22T19.38.07.create-behaviour-level-details-table.ts
index 59f3180..868e19f 100644
--- a/backend/typescript/migrations/2024.10.22T19.38.07.create-behaviour-level-details-table.ts
+++ b/backend/typescript/migrations/2024.10.22T19.38.07.create-behaviour-level-details-table.ts
@@ -23,10 +23,6 @@ export const up: Migration = async ({ context: sequelize }) => {
     },
     level: {
       type: DataType.INTEGER,
-      validate: {
-        min: 1,
-        max: 4,
-      },
       allowNull: false,
     },
     description: {
diff --git a/backend/typescript/migrations/2024.10.29T20.20.02.create-user-behaviour-table.ts b/backend/typescript/migrations/2024.10.29T20.20.02.create-user-behaviour-table.ts
new file mode 100644
index 0000000..da04cc5
--- /dev/null
+++ b/backend/typescript/migrations/2024.10.29T20.20.02.create-user-behaviour-table.ts
@@ -0,0 +1,62 @@
+import { DataType } from "sequelize-typescript";
+
+import { Migration } from "../umzug";
+import { MAX_BEHAVIOUR_LEVEL, MIN_BEHAVIOUR_LEVEL } from "../constants";
+
+const TABLE_NAME = "user_behaviours";
+const CONSTRAINT_NAME = "unique_user_behaviour_skill";
+const CONSTRAINT_NAME_2 = "max_level_interval";
+
+export const up: Migration = async ({ context: sequelize }) => {
+  await sequelize.getQueryInterface().createTable(TABLE_NAME, {
+    id: {
+      type: DataType.INTEGER,
+      allowNull: false,
+      primaryKey: true,
+      autoIncrement: true,
+    },
+    user_id: {
+      type: DataType.INTEGER,
+      allowNull: false,
+      references: {
+        model: "users",
+        key: "id",
+      },
+    },
+    behaviour_id: {
+      type: DataType.INTEGER,
+      allowNull: false,
+      references: {
+        model: "behaviours",
+        key: "id",
+      },
+    },
+    max_level: {
+      type: DataType.INTEGER,
+      allowNull: false,
+    },
+  });
+
+  await sequelize.getQueryInterface().addConstraint(TABLE_NAME, {
+    fields: ["behaviour_id", "user_id"],
+    type: "unique",
+    name: CONSTRAINT_NAME,
+  });
+
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} ADD CONSTRAINT ${CONSTRAINT_NAME_2} 
+    CHECK (max_level BETWEEN ${MIN_BEHAVIOUR_LEVEL} AND ${MAX_BEHAVIOUR_LEVEL});`,
+  );
+};
+
+export const down: Migration = async ({ context: sequelize }) => {
+  await sequelize
+    .getQueryInterface()
+    .removeConstraint(TABLE_NAME, CONSTRAINT_NAME);
+
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} DROP CONSTRAINT ${CONSTRAINT_NAME_2};`,
+  );
+
+  await sequelize.getQueryInterface().dropTable(TABLE_NAME);
+};
diff --git a/backend/typescript/migrations/2024.10.29T20.29.50.add-pet-behaviour-columns.ts b/backend/typescript/migrations/2024.10.29T20.29.50.add-pet-behaviour-columns.ts
new file mode 100644
index 0000000..c8ec3bc
--- /dev/null
+++ b/backend/typescript/migrations/2024.10.29T20.29.50.add-pet-behaviour-columns.ts
@@ -0,0 +1,40 @@
+import { DataType } from "sequelize-typescript";
+import { Migration } from "../umzug";
+import { MAX_BEHAVIOUR_LEVEL, MIN_BEHAVIOUR_LEVEL } from "../constants";
+
+const TABLE_NAME = "pet_behaviours";
+const CONSTRAINT_NAME = "unique_pet_behaviour";
+const CONSTRAINT_NAME_2 = "skill_level_interval";
+
+export const up: Migration = async ({ context: sequelize }) => {
+  await sequelize.getQueryInterface().addColumn(TABLE_NAME, "is_highlighted", {
+    type: DataType.BOOLEAN,
+    allowNull: true,
+    defaultValue: false,
+  });
+
+  await sequelize.getQueryInterface().addConstraint(TABLE_NAME, {
+    fields: ["behaviour_id", "pet_id"],
+    type: "unique",
+    name: CONSTRAINT_NAME,
+  });
+
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} ADD CONSTRAINT ${CONSTRAINT_NAME_2} 
+    CHECK (skill_level BETWEEN ${MIN_BEHAVIOUR_LEVEL} AND ${MAX_BEHAVIOUR_LEVEL});`,
+  );
+};
+
+export const down: Migration = async ({ context: sequelize }) => {
+  await sequelize
+    .getQueryInterface()
+    .removeConstraint(TABLE_NAME, CONSTRAINT_NAME);
+
+  await sequelize
+    .getQueryInterface()
+    .removeColumn(TABLE_NAME, "is_highlighted");
+
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} DROP CONSTRAINT ${CONSTRAINT_NAME_2};`,
+  );
+};
diff --git a/backend/typescript/migrations/2024.11.21T16.49.50.add-constraint-behaviour-level-details-table.ts b/backend/typescript/migrations/2024.11.21T16.49.50.add-constraint-behaviour-level-details-table.ts
new file mode 100644
index 0000000..b93ad21
--- /dev/null
+++ b/backend/typescript/migrations/2024.11.21T16.49.50.add-constraint-behaviour-level-details-table.ts
@@ -0,0 +1,19 @@
+import { DataType } from "sequelize-typescript";
+import { Migration } from "../umzug";
+import { MAX_BEHAVIOUR_LEVEL, MIN_BEHAVIOUR_LEVEL } from "../constants";
+
+const TABLE_NAME = "behaviour_level_details";
+const CONSTRAINT_NAME = "level_interval";
+
+export const up: Migration = async ({ context: sequelize }) => {
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} ADD CONSTRAINT ${CONSTRAINT_NAME} 
+    CHECK (level BETWEEN ${MIN_BEHAVIOUR_LEVEL} AND ${MAX_BEHAVIOUR_LEVEL});`,
+  );
+};
+
+export const down: Migration = async ({ context: sequelize }) => {
+  await sequelize.query(
+    `ALTER TABLE ${TABLE_NAME} DROP CONSTRAINT ${CONSTRAINT_NAME};`,
+  );
+};
diff --git a/backend/typescript/models/petBehaviour.ts b/backend/typescript/models/petBehaviour.model.ts
similarity index 65%
rename from backend/typescript/models/petBehaviour.ts
rename to backend/typescript/models/petBehaviour.model.ts
index 524e0d3..04479d9 100644
--- a/backend/typescript/models/petBehaviour.ts
+++ b/backend/typescript/models/petBehaviour.model.ts
@@ -4,6 +4,7 @@ import {
   Table,
   ForeignKey,
   BelongsTo,
+  DataType,
 } from "sequelize-typescript";
 import Behaviour from "./behaviour.model";
 import Pet from "./pet.model";
@@ -11,19 +12,22 @@ import Pet from "./pet.model";
 @Table({ timestamps: false, tableName: "pet_behaviours" })
 export default class PetBehaviour extends Model {
   @ForeignKey(() => Pet)
-  @Column({})
+  @Column({ type: DataType.INTEGER, allowNull: false })
   pet_id!: number;
 
   @BelongsTo(() => Pet)
   pet!: Pet;
 
   @ForeignKey(() => Behaviour)
-  @Column({})
+  @Column({ type: DataType.INTEGER, allowNull: false })
   behaviour_id!: number;
 
   @BelongsTo(() => Behaviour)
   behaviour!: Behaviour;
 
-  @Column({})
+  @Column({ type: DataType.INTEGER, allowNull: false })
   skill_level!: number;
+
+  @Column({ type: DataType.BOOLEAN, allowNull: true })
+  is_highlighted!: boolean;
 }
diff --git a/backend/typescript/models/userBehaviour.model.ts b/backend/typescript/models/userBehaviour.model.ts
new file mode 100644
index 0000000..3198945
--- /dev/null
+++ b/backend/typescript/models/userBehaviour.model.ts
@@ -0,0 +1,30 @@
+import {
+  Column,
+  Model,
+  Table,
+  ForeignKey,
+  BelongsTo,
+  DataType,
+} from "sequelize-typescript";
+import Behaviour from "./behaviour.model";
+import User from "./user.model";
+
+@Table({ timestamps: false, tableName: "user_behaviours" })
+export default class UserBehaviour extends Model {
+  @ForeignKey(() => User)
+  @Column({ type: DataType.INTEGER, allowNull: false })
+  user_id!: number;
+
+  @BelongsTo(() => User)
+  user!: User;
+
+  @ForeignKey(() => Behaviour)
+  @Column({ type: DataType.INTEGER, allowNull: false })
+  behaviour_id!: number;
+
+  @BelongsTo(() => Behaviour)
+  behaviour!: Behaviour;
+
+  @Column({ type: DataType.INTEGER, allowNull: false })
+  max_level!: number;
+}