diff --git a/app/controllers/collections_controller.ts b/app/controllers/collections_controller.ts
index 27464aa..17725ee 100644
--- a/app/controllers/collections_controller.ts
+++ b/app/controllers/collections_controller.ts
@@ -120,6 +120,7 @@ export default class CollectionsController {
   async getCollectionsByAuthorId(authorId: User['id']) {
     return await Collection.query()
       .where('author_id', authorId)
+      .orderBy('created_at')
       .preload('links');
   }
 
diff --git a/app/controllers/users_controller.ts b/app/controllers/users_controller.ts
index b2ed31d..04faef4 100644
--- a/app/controllers/users_controller.ts
+++ b/app/controllers/users_controller.ts
@@ -49,6 +49,7 @@ export default class UsersController {
         nickName,
         avatarUrl,
         token,
+        providerType: 'google',
       }
     );
 
diff --git a/app/middleware/log_request.ts b/app/middleware/log_request.ts
index f109cf4..8371949 100644
--- a/app/middleware/log_request.ts
+++ b/app/middleware/log_request.ts
@@ -10,7 +10,7 @@ export default class LogRequest {
       !request.url().startsWith('/@react-refresh') &&
       !request.url().includes('.ts')
     ) {
-      logger.info(`-> ${request.method()}: ${request.url()}`);
+      logger.info(`[${request.method()}]: ${request.url()}`);
     }
     await next();
   }
diff --git a/app/models/app_base_model.ts b/app/models/app_base_model.ts
index 7a0f458..5152dfa 100644
--- a/app/models/app_base_model.ts
+++ b/app/models/app_base_model.ts
@@ -1,29 +1,27 @@
-import { BaseModel, CamelCaseNamingStrategy, beforeCreate, column } from '@adonisjs/lucid/orm';
+import {
+  BaseModel,
+  CamelCaseNamingStrategy,
+  column,
+} from '@adonisjs/lucid/orm';
 import { DateTime } from 'luxon';
-import { v4 as uuidv4 } from 'uuid';
 
 export default class AppBaseModel extends BaseModel {
   static namingStrategy = new CamelCaseNamingStrategy();
   static selfAssignPrimaryKey = true;
 
   @column({ isPrimary: true })
-  declare id: string; // UUID
+  declare id: number;
 
   @column.dateTime({
     autoCreate: true,
-    serializeAs: 'createdAt',
+    serializeAs: 'created_at',
   })
-  declare createdAt: DateTime;
+  declare created_at: DateTime;
 
   @column.dateTime({
     autoCreate: true,
     autoUpdate: true,
-    serializeAs: 'updatedAt',
+    serializeAs: 'updated_at',
   })
-  declare updatedAt: DateTime;
-
-  @beforeCreate()
-  static assignUuid(item: any) {
-    item.id = uuidv4();
-  }
+  declare updated_at: DateTime;
 }
diff --git a/app/models/collection.ts b/app/models/collection.ts
index 87df0b4..ebaaa8f 100644
--- a/app/models/collection.ts
+++ b/app/models/collection.ts
@@ -16,10 +16,10 @@ export default class Collection extends AppBaseModel {
   declare visibility: Visibility;
 
   @column()
-  declare nextId: string;
+  declare next_id: number;
 
   @column()
-  declare authorId: string;
+  declare authorId: number;
 
   @belongsTo(() => User, { foreignKey: 'authorId' })
   declare author: BelongsTo<typeof User>;
diff --git a/app/models/link.ts b/app/models/link.ts
index ed0646c..0c13584 100644
--- a/app/models/link.ts
+++ b/app/models/link.ts
@@ -9,7 +9,7 @@ export default class Link extends AppBaseModel {
   declare name: string;
 
   @column()
-  declare description: string;
+  declare description: string | null;
 
   @column()
   declare url: string;
@@ -18,13 +18,13 @@ export default class Link extends AppBaseModel {
   declare favorite: boolean;
 
   @column()
-  declare collectionId: string;
+  declare collectionId: number;
 
   @belongsTo(() => Collection, { foreignKey: 'collectionId' })
   declare collection: BelongsTo<typeof Collection>;
 
   @column()
-  declare authorId: string;
+  declare authorId: number;
 
   @belongsTo(() => User, { foreignKey: 'authorId' })
   declare author: BelongsTo<typeof User>;
diff --git a/app/models/user.ts b/app/models/user.ts
index a683997..a666869 100644
--- a/app/models/user.ts
+++ b/app/models/user.ts
@@ -1,7 +1,7 @@
 import Collection from '#models/collection';
 import Link from '#models/link';
 import type { GoogleToken } from '@adonisjs/ally/types';
-import { column, manyToMany } from '@adonisjs/lucid/orm';
+import { column, computed, manyToMany } from '@adonisjs/lucid/orm';
 import type { ManyToMany } from '@adonisjs/lucid/types/relations';
 import AppBaseModel from './app_base_model.js';
 
@@ -12,20 +12,23 @@ export default class User extends AppBaseModel {
   @column()
   declare name: string;
 
-  @column({ serializeAs: 'nickName' })
+  @column()
   declare nickName: string; // public username
 
-  @column({ serializeAs: 'avatarUrl' })
+  @column()
   declare avatarUrl: string;
 
   @column()
   declare isAdmin: boolean;
 
   @column({ serializeAs: null })
-  declare token: GoogleToken;
+  declare token?: GoogleToken;
 
   @column({ serializeAs: null })
-  declare providerId: string;
+  declare providerId: number;
+
+  @column({ serializeAs: null })
+  declare providerType: 'google';
 
   @manyToMany(() => Collection, {
     relatedKey: 'authorId',
@@ -36,4 +39,9 @@ export default class User extends AppBaseModel {
     relatedKey: 'authorId',
   })
   declare links: ManyToMany<typeof Link>;
+
+  @computed()
+  get fullname() {
+    return this.nickName || this.name;
+  }
 }
diff --git a/app/validators/collection.ts b/app/validators/collection.ts
index 3e16626..54516b9 100644
--- a/app/validators/collection.ts
+++ b/app/validators/collection.ts
@@ -2,7 +2,7 @@ import vine, { SimpleMessagesProvider } from '@vinejs/vine';
 import { Visibility } from '../enums/visibility.js';
 
 const params = vine.object({
-  id: vine.string().trim(),
+  id: vine.number(),
 });
 
 export const createCollectionValidator = vine.compile(
@@ -10,7 +10,7 @@ export const createCollectionValidator = vine.compile(
     name: vine.string().trim().minLength(1).maxLength(254),
     description: vine.string().trim().maxLength(254).nullable(),
     visibility: vine.enum(Visibility),
-    nextId: vine.string().optional(),
+    nextId: vine.number(),
   })
 );
 
@@ -19,7 +19,7 @@ export const updateCollectionValidator = vine.compile(
     name: vine.string().trim().minLength(1).maxLength(254),
     description: vine.string().trim().maxLength(254).nullable(),
     visibility: vine.enum(Visibility),
-    nextId: vine.string().optional(),
+    nextId: vine.number(),
 
     params,
   })
diff --git a/app/validators/link.ts b/app/validators/link.ts
index f4225f6..f247377 100644
--- a/app/validators/link.ts
+++ b/app/validators/link.ts
@@ -1,7 +1,7 @@
 import vine from '@vinejs/vine';
 
 const params = vine.object({
-  id: vine.string().trim(),
+  id: vine.number(),
 });
 
 export const createLinkValidator = vine.compile(
@@ -10,7 +10,7 @@ export const createLinkValidator = vine.compile(
     description: vine.string().trim().maxLength(300).optional(),
     url: vine.string().trim(),
     favorite: vine.boolean(),
-    collectionId: vine.string().trim(),
+    collectionId: vine.number(),
   })
 );
 
@@ -20,7 +20,7 @@ export const updateLinkValidator = vine.compile(
     description: vine.string().trim().maxLength(300).optional(),
     url: vine.string().trim(),
     favorite: vine.boolean(),
-    collectionId: vine.string().trim(),
+    collectionId: vine.number(),
 
     params,
   })
@@ -37,7 +37,7 @@ export const updateLinkFavoriteStatusValidator = vine.compile(
     favorite: vine.boolean(),
 
     params: vine.object({
-      id: vine.string().trim(),
+      id: vine.number(),
     }),
   })
 );
diff --git a/app/validators/search.ts b/app/validators/search.ts
new file mode 100644
index 0000000..503dc2d
--- /dev/null
+++ b/app/validators/search.ts
@@ -0,0 +1,9 @@
+import vine from '@vinejs/vine';
+
+export const searchValidator = vine.compile(
+  vine.object({
+    searchTerm: vine.string().trim().minLength(1).maxLength(254),
+    links: vine.boolean(),
+    collections: vine.boolean(),
+  })
+);
diff --git a/database/default_table_fields.ts b/database/default_table_fields.ts
new file mode 100644
index 0000000..1c901c1
--- /dev/null
+++ b/database/default_table_fields.ts
@@ -0,0 +1,8 @@
+import { Knex } from 'knex';
+
+export function defaultTableFields(table: Knex.CreateTableBuilder) {
+  table.increments('id', { primaryKey: true }).first().unique().notNullable();
+
+  table.timestamp('created_at').notNullable();
+  table.timestamp('updated_at').nullable();
+}
diff --git a/database/migrations/1714218548323_create_users_table.ts b/database/migrations/1714218548323_create_users_table.ts
index f40f97e..87068c7 100644
--- a/database/migrations/1714218548323_create_users_table.ts
+++ b/database/migrations/1714218548323_create_users_table.ts
@@ -1,27 +1,26 @@
+import { defaultTableFields } from '#database/default_table_fields';
 import { BaseSchema } from '@adonisjs/lucid/schema';
 
-export default class extends BaseSchema {
-  protected tableName = 'users';
+export default class CreateUsersTable extends BaseSchema {
+  static tableName = 'users';
 
   async up() {
-    this.schema.createTable(this.tableName, (table) => {
-      table.uuid('id').primary().unique().notNullable();
-
+    this.schema.createTableIfNotExists(CreateUsersTable.tableName, (table) => {
       table.string('email', 254).notNullable().unique();
       table.string('name', 254).notNullable();
-      table.string('nick_name', 254).notNullable();
+      table.string('nick_name', 254).nullable();
       table.text('avatar_url').notNullable();
       table.boolean('is_admin').defaultTo(0).notNullable();
 
-      table.json('token').notNullable();
+      table.json('token').nullable();
       table.string('provider_id').notNullable();
+      table.enum('provider_type', ['google']).notNullable().defaultTo('google');
 
-      table.timestamp('created_at').notNullable();
-      table.timestamp('updated_at').nullable();
+      defaultTableFields(table);
     });
   }
 
   async down() {
-    this.schema.dropTable(this.tableName);
+    this.schema.dropTable(CreateUsersTable.tableName);
   }
 }
diff --git a/database/migrations/1714253983443_create_collections_table.ts b/database/migrations/1714253983443_create_collections_table.ts
index 6cba8d2..26eef62 100644
--- a/database/migrations/1714253983443_create_collections_table.ts
+++ b/database/migrations/1714253983443_create_collections_table.ts
@@ -1,40 +1,44 @@
+import { defaultTableFields } from '#database/default_table_fields';
 import { BaseSchema } from '@adonisjs/lucid/schema';
 import { Visibility } from '../../app/enums/visibility.js';
 
-export default class extends BaseSchema {
-  protected tableName = 'collections';
+export default class CreateCollectionTable extends BaseSchema {
+  static tableName = 'collections';
   private visibilityEnumName = 'collection_visibility';
 
   async up() {
     this.schema.raw(`DROP TYPE IF EXISTS ${this.visibilityEnumName}`);
-    this.schema.createTable(this.tableName, (table) => {
-      table.uuid('id').primary().unique().notNullable();
+    this.schema.createTableIfNotExists(
+      CreateCollectionTable.tableName,
+      (table) => {
+        table.string('name', 254).notNullable();
+        table.string('description', 254).nullable();
+        table
+          .enum('visibility', Object.values(Visibility), {
+            useNative: true,
+            enumName: this.visibilityEnumName,
+            existingType: false,
+          })
+          .nullable()
+          .defaultTo(Visibility.PRIVATE);
+        table
+          .integer('next_id')
+          .references('id')
+          .inTable('collections')
+          .defaultTo(null);
+        table
+          .integer('author_id')
+          .references('id')
+          .inTable('users')
+          .onDelete('CASCADE');
 
-      table.string('name', 254).notNullable();
-      table.string('description', 254);
-      table
-        .uuid('next_id')
-        .references('id')
-        .inTable('collections')
-        .defaultTo(null);
-      table
-        .uuid('author_id')
-        .references('id')
-        .inTable('users')
-        .onDelete('CASCADE');
-      table.enum('visibility', Object.values(Visibility), {
-        useNative: true,
-        enumName: this.visibilityEnumName,
-        existingType: false,
-      });
-
-      table.timestamp('created_at');
-      table.timestamp('updated_at');
-    });
+        defaultTableFields(table);
+      }
+    );
   }
 
   async down() {
     this.schema.raw(`DROP TYPE IF EXISTS ${this.visibilityEnumName}`);
-    this.schema.dropTable(this.tableName);
+    this.schema.dropTable(CreateCollectionTable.tableName);
   }
 }
diff --git a/database/migrations/1714254076754_create_links_table.ts b/database/migrations/1714254076754_create_links_table.ts
index fb8daaa..f65a26d 100644
--- a/database/migrations/1714254076754_create_links_table.ts
+++ b/database/migrations/1714254076754_create_links_table.ts
@@ -1,33 +1,31 @@
+import { defaultTableFields } from '#database/default_table_fields';
 import { BaseSchema } from '@adonisjs/lucid/schema';
 
-export default class extends BaseSchema {
-  protected tableName = 'links';
+export default class CreateLinksTable extends BaseSchema {
+  static tableName = 'links';
 
   async up() {
-    this.schema.createTable(this.tableName, (table) => {
-      table.uuid('id').primary().unique().notNullable();
-
+    this.schema.createTableIfNotExists(CreateLinksTable.tableName, (table) => {
       table.string('name', 254).notNullable();
-      table.string('description', 254);
+      table.string('description', 254).nullable();
       table.text('url').notNullable();
       table.boolean('favorite').notNullable().defaultTo(0);
       table
-        .uuid('collection_id')
+        .integer('collection_id')
         .references('id')
         .inTable('collections')
         .onDelete('CASCADE');
       table
-        .uuid('author_id')
+        .integer('author_id')
         .references('id')
         .inTable('users')
         .onDelete('CASCADE');
 
-      table.timestamp('created_at');
-      table.timestamp('updated_at');
+      defaultTableFields(table);
     });
   }
 
   async down() {
-    this.schema.dropTable(this.tableName);
+    this.schema.dropTable(CreateLinksTable.tableName);
   }
 }
diff --git a/database/seeders/user_seeder.ts b/database/seeders/user_seeder.ts
index 91b22d8..69889cf 100644
--- a/database/seeders/user_seeder.ts
+++ b/database/seeders/user_seeder.ts
@@ -16,13 +16,14 @@ export default class extends BaseSeeder {
 
 export function createRandomUser() {
   return {
-    id: faker.string.uuid(),
+    id: faker.number.int(),
     email: faker.internet.email(),
     name: faker.internet.userName(),
     nickName: faker.internet.displayName(),
     avatarUrl: faker.image.avatar(),
     isAdmin: false,
-    providerId: faker.string.uuid(),
+    providerId: faker.number.int(),
+    providerType: 'google' as const,
     token: {} as GoogleToken,
   };
 }
diff --git a/inertia/components/dashboard/side_nav/user_card.tsx b/inertia/components/dashboard/side_nav/user_card.tsx
index fc7b361..7d02a9e 100644
--- a/inertia/components/dashboard/side_nav/user_card.tsx
+++ b/inertia/components/dashboard/side_nav/user_card.tsx
@@ -4,7 +4,7 @@ import useUser from '~/hooks/use_user';
 
 export default function UserCard() {
   const { user, isAuthenticated } = useUser();
-  const altImage = `${user?.nickName}'s avatar`;
+  const altImage = `${user?.fullname}'s avatar`;
   return (
     isAuthenticated && (
       <Item className="disable-hover">
@@ -14,7 +14,7 @@ export default function UserCard() {
           alt={altImage}
           referrerPolicy="no-referrer"
         />
-        {user.nickName}
+        {user.fullname}
       </Item>
     )
   );
diff --git a/inertia/components/navbar/navbar.tsx b/inertia/components/navbar/navbar.tsx
index 5b513be..6c19cce 100644
--- a/inertia/components/navbar/navbar.tsx
+++ b/inertia/components/navbar/navbar.tsx
@@ -103,7 +103,7 @@ function ProfileDropdown() {
             width={22}
             referrerPolicy="no-referrer"
           />
-          {user!.nickName}
+          {user!.fullname}
         </UserCard>
       }
     >
diff --git a/inertia/components/settings/modal.tsx b/inertia/components/settings/modal.tsx
index 8d59332..76f809a 100644
--- a/inertia/components/settings/modal.tsx
+++ b/inertia/components/settings/modal.tsx
@@ -1,7 +1,7 @@
 import { Link } from '@inertiajs/react';
 import { route } from '@izzyjs/route/client';
 import { useTranslation } from 'react-i18next';
-import { BsGear } from 'react-icons/bs';
+import { PiGearLight } from 'react-icons/pi';
 import Modal from '~/components/common/modal/modal';
 import LangSelector from '~/components/lang_selector';
 import ThemeSwitcher from '~/components/theme_switcher';
@@ -20,7 +20,7 @@ export default function ModalSettings({
   return (
     <>
       <OpenItem onClick={open}>
-        <BsGear />
+        <PiGearLight />
         {t('settings')}
       </OpenItem>
       <Modal title={t('settings')} opened={isShowing} close={close}>
diff --git a/inertia/types/app.d.ts b/inertia/types/app.d.ts
index 670788e..0756812 100644
--- a/inertia/types/app.d.ts
+++ b/inertia/types/app.d.ts
@@ -1,10 +1,11 @@
 import type Collection from '#models/collection';
 
 type User = {
-  id: string;
+  id: number;
   email: string;
   name: string;
   nickName: string;
+  fullname: string;
   avatarUrl: string;
   isAdmin: boolean;
   collections: Collection[];