diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a02a682..d53560d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -5,7 +5,6 @@ on:
   push:
     branches:
       - main
-      - dev
   workflow_dispatch:
   workflow_call:
 
@@ -47,9 +46,9 @@ jobs:
 
       - name: Typecheck workspaces
         run: |
-          npm run lint:types:check -w packages/shared --if-present
-          npm run lint:types:check -w apps/web --if-present
-          npm run lint:types:check -w apps/backend --if-present
+          npm run lint:types:check -w @nodejs-monorepo/shared --if-present
+          npm run lint:types:check -w @nodejs-monorepo/web --if-present
+          npm run lint:types:check -w @nodejs-monorepo/backend --if-present
 
       - name: Build workspaces
         run: |
diff --git a/Dockerfile.backend b/Dockerfile.backend
index 468acc1..8e255d0 100644
--- a/Dockerfile.backend
+++ b/Dockerfile.backend
@@ -30,11 +30,9 @@ COPY packages/shared/package.json ./packages/shared/
 COPY apps/web/package.json ./apps/web/
 COPY apps/backend/package.json ./apps/backend/
 
-# Prisma CLI is required only for prisma migrate deploy in compose one-off containers.
 RUN npm ci --omit=dev \
 	&& npm install prisma@7.4.2 --no-save --no-audit --no-fund
 
-# prisma.config imports loadEnvFile for monorepo root .env; provide an empty stub so migrations work when Compose injects env vars.
 RUN touch /app/.env
 
 COPY --from=builder /app/packages/shared/dist ./packages/shared/dist
diff --git a/Dockerfile.web b/Dockerfile.web
index 88898d5..99bba51 100644
--- a/Dockerfile.web
+++ b/Dockerfile.web
@@ -1,6 +1,3 @@
-# syntax=docker/dockerfile:1
-
-# Vite + React static build, served by nginx.
 ARG NODE_VERSION=22-bookworm-slim
 
 FROM node:${NODE_VERSION} AS builder
@@ -11,7 +8,6 @@ COPY packages/shared/package.json ./packages/shared/
 COPY apps/web/package.json ./apps/web/
 COPY apps/backend/package.json ./apps/backend/
 
-# Optional/native binaries must match the image arch. Keep @rollup/* / @swc/core-linux-* versions in sync with package-lock.json when upgrading Vite or SWC.
 RUN npm ci \
 	&& npm install --no-audit --no-fund \
 	&& ARCH=$(uname -m) \
diff --git a/README.md b/README.md
index 39d7a13..35f1a43 100644
--- a/README.md
+++ b/README.md
@@ -1,145 +1 @@
 # NodeJS Monorepo
-
-npm workspaces monorepo: deployable apps under `apps/`, reusable libraries under `packages/`. This document is the **source of truth** for naming and layout; tooling (Biome, **ls-lint**, Knip) should stay aligned with it.
-
-## Workspace layout
-
-| Path | npm `name` | Role |
-|------|------------|------|
-| `apps/backend` | `@nodejs-monorepo/backend` | NestJS API, Prisma, feature modules |
-| `apps/web` | `@nodejs-monorepo/web` | Vite + React SPA |
-| `packages/shared` | `@nodejs-monorepo/shared` | Types and other cross-app, runtime-safe code |
-
-**Rules**
-
-- Every workspace package uses the **`@nodejs-monorepo/*`** scope (`package.json` → `name`).
-- New runnable deployables → **`apps/<name>/`** (short role name, **`kebab-case`**), e.g. `admin`, `worker-notifications`.
-- New libraries → **`packages/<name>/`** (capability-oriented, **`kebab-case`**), e.g. `eslint-config`, `ui`.
-
-Imports across boundaries use package names only, never deep relative hops between apps:
-
-```ts
-import type { SignInType } from "@nodejs-monorepo/shared";
-```
-
----
-
-## Filesystem naming (repository-wide)
-
-| What | Convention | Enforcement |
-|------|------------|-------------|
-| **Directories** under workspace `src/` | **`kebab-case`** | `health-checks/`, `sign-in/`, `rate-limit/` |
-| **Files** `.ts` / `.tsx` under `apps/*/src` and `packages/*/src` | **`kebab-case`** stem | `auth.service.ts`, `sign-up.dto.ts`, `sign-in.route.tsx`, `config-key.constant.ts` |
-| **Root / tooling filenames** | Ecosystem defaults | `biome.json`, `docker-compose.yml`, `Dockerfile.backend`, `commitlint.config.ts` |
-
-**`ls-lint`** (`.ls-lint.yml`) applies **`kebab-case`** to **`.dir`**, **`.ts`**, and **`.tsx`** under:
-
-- `apps/*/src`
-- `packages/*/src`
-
-Ignored paths include **`node_modules`**, **`dist`**, **`.git`**, and **`**/prisma/migrations/**`** (Prisma timestamp folder names).
-
-**React:** file names stay **`kebab-case`** (same as Nest modules). Exported route/component **identifiers** are **`PascalCase`** (e.g. `SignInRoute` in `sign-in.route.tsx`). Do not use **`PascalCase.tsx`** filenames in `src/`—that diverges from backend and breaks a single filesystem rule.
-
-**Tests:** co-locate **`*.spec.ts`** / **`*.test.ts`** next to the module under test, or use **`__tests__/`**—pick one style per package and keep it consistent.
-
----
-
-## TypeScript symbols (all packages)
-
-| Kind | Style | Examples in this repo |
-|------|--------|------------------------|
-| **Classes** (Nest providers, DTOs, RDOs, guards, entities) | **`PascalCase`** | `AuthService`, `SignInDto`, `AuthRdo` |
-| **Types / interfaces** | **`PascalCase`** | `AuthPayload`, `SignInType`, `EnvironmentType` |
-| **Functions, methods, variables, properties** | **`camelCase`** | `signUp`, `configService`, `accessToken` |
-| **Booleans** | **`is` / `has` / `can` / `should`** prefix | `isEnabled`, `hasSession` |
-| **Enum type** | **`PascalCase`** | `OrderStatus` |
-| **Enum members** | **`PascalCase`** preferred (matches typical TS + Swagger usage) | `Pending`, `Active` — if you introduce **`UPPER_SNAKE`** members, keep them consistent within that enum |
-
-**Constants**
-
-- **Fixed key maps / grouped config tokens** → export as a **`PascalCase`** object whose name ends with **`Constant`**, in **`*.constant.ts`**. Example: `ConfigKeyConstant`, `EnvironmentsConstant` in `config-key.constant.ts`, `environments.constant.ts`.
-- **Primitive literals** (timeouts, magic numbers shared across files) → **`UPPER_SNAKE`** when it improves scanability, or **`camelCase`** `as const` objects for grouped defaults—prefer one approach per file.
-
-**Barrel files** in a feature folder use a **short plural topic** matching siblings: **`dtos.ts`**, **`rdos.ts`**, **`types.ts`**, **`constants.ts`**, **`guards.ts`**, **`strategies.ts`**, **`interceptors.ts`**, **`filters.ts`**, **`decorators.ts`**. Re-export **named** exports explicitly; keep barrels **shallow** (avoid `index.ts` chains that obscure bundle entry points).
-
-**Helpers (“utils”)** → only for **generic, domain-agnostic** pure functions (formatting, small assertions). **Feature rules** belong under **`modules/<feature>/`** next to that feature’s service/repository—not in a dumping ground called `helpers.ts`.
-
----
-
-## Backend (`apps/backend`)
-
-### Folders under `src/`
-
-| Folder | Purpose |
-|--------|---------|
-| **`modules/`** | Vertical features: **`modules/<feature>/`** (e.g. `auth/`). One Nest **`*.module.ts`** per feature slice when it’s a bounded context. |
-| **`core/`** | Infrastructure wired as Nest modules: Prisma, Redis, JWT, S3, rate limiting, config, health checks, registrations under **`core/config/registers/`**. |
-| **`common/`** | Cross-feature primitives: decorators, guards, strategies, interceptors, filters, shared types, constants. |
-
-### File suffixes (Nest + this repo)
-
-| Pattern | Role |
-|---------|------|
-| **`<feature>.module.ts`** | Nest module |
-| **`<feature>.controller.ts`** | HTTP controller |
-| **`<feature>.service.ts`** | Injectable application service |
-| **`<feature>.repository.ts`** | Data access |
-| **`<name>.dto.ts`** | Request / input DTO (validation, Swagger) |
-| **`<name>.rdo.ts`** | Response DTO (**RDO**—serialized API output) |
-| **`<name>.guard.ts`** | Auth / policy guard |
-| **`<name>.strategy.ts`** | Passport strategy |
-| **`<name>.interceptor.ts`** | Interceptor |
-| **`<name>.filter.ts`** | Exception filter |
-| **`<name>.decorator.ts`** | Custom decorator |
-| **`<name>.type.ts`** | Shared TS-only types (not tied to a single class file) |
-| **`<name>.register.ts`** | Joi/env registration helpers in **`core/config/registers/`** |
-| **`prisma/schema.prisma`**, **`prisma/migrations/`** | Schema and migrations (**migration folder names** = Prisma default: timestamp + **`snake_case`** slug) |
-| **`prisma/seeders/`** | Seed scripts (**`kebab-case`** `.ts` files when you add more than `seeder.ts`) |
-
-### ESM note
-
-Production build uses **`"type": "module"`** with relative imports that often include **`.js`** extensions targeting emitted files (see Nest/tsconfig). Match existing import style when adding files.
-
----
-
-## Shared package (`packages/shared`)
-
-| Topic | Rule |
-|-------|------|
-| **Purpose** | Code safe for **both** backend and frontend (no Node-only APIs, no Nest/DOM leakage unless split entry points). |
-| **Layout** | **`src/types/<domain>/`** (e.g. `types/auth/`), **`src/index.ts`** as the package entry barrel. |
-| **Type names** | **`PascalCase`** (`SignInType`, `SignUpType`). |
-| **Files** | **`kebab-case`**, multi-word segments joined with hyphens (`sign-in.type.ts`). |
-
----
-
-## Web app (`apps/web`)
-
-| Area | Convention |
-|------|------------|
-| **Routes** | **`src/routes/<segment>/<segment>.route.tsx`** mirroring URL segments (`kebab-case` dirs + file stem). |
-| **Exported route component** | **`PascalCase`** symbol matching the page (`SignInRoute`). |
-| **Entry** | `src/main.tsx`, Vite **`index.html`** (entries also referenced in **`knip.config.ts`**). |
-| **Future UI** | Optional **`src/components/`** with **`kebab-case.tsx`** files (e.g. `primary-button.tsx`) exporting **`PascalCase`** components, **or** one folder per component **`primary-button/index.tsx`**—choose one pattern for the whole app. |
-
----
-
-## Tooling (naming-adjacent)
-
-| Tool | Role |
-|------|------|
-| **Biome** | Formatter + linter (root / per-package `biome.json`). |
-| **ls-lint** | **`kebab-case`** dirs and **`.ts` / `.tsx`** under workspace `src/` trees (see above). |
-| **Knip** | Unused exports/deps; entry globs in **`knip.config.ts`**. |
-
----
-
-## Checklist for new code
-
-1. Workspace **`name`**: `@nodejs-monorepo/<pkg>`; disk folder **`kebab-case`** under `apps/` or `packages/`.
-2. Under **`apps/*/src`** or **`packages/*/src`**: directories and **`*.ts` / `*.tsx`** → **`kebab-case`**; React exports **`PascalCase`**.
-3. Nest artifacts → suffix table above; **DTO** vs **RDO** filenames explicit.
-4. Cross-app contracts → **`packages/shared`** with **`PascalCase`** types.
-5. Grouped env/config keys → **`SomethingConstant`** in **`*.constant.ts`**.
-6. Run **`npm run lint:filesystem:check`** before pushing when you add files or folders.
diff --git a/apps/backend/src/common/constants/config-key.constant.ts b/apps/backend/src/common/constants/config-key.constant.ts
index 0cdf669..61d7caa 100644
--- a/apps/backend/src/common/constants/config-key.constant.ts
+++ b/apps/backend/src/common/constants/config-key.constant.ts
@@ -1,4 +1,4 @@
-export const ConfigKeyConstant = {
+export const CONFIG_KEY = {
 	redis: "redis",
 	app: "app",
 	environment: "environment",
diff --git a/apps/backend/src/common/constants/environments.constant.ts b/apps/backend/src/common/constants/environments.constant.ts
index 96d3e41..3d80902 100644
--- a/apps/backend/src/common/constants/environments.constant.ts
+++ b/apps/backend/src/common/constants/environments.constant.ts
@@ -1,4 +1,4 @@
-export const EnvironmentsConstant = {
+export const ENVIRONMENTS = {
 	local: "local",
 	staging: "staging",
 	production: "production",
diff --git a/apps/backend/src/common/decorators/user-id.decorator.ts b/apps/backend/src/common/decorators/user-id.decorator.ts
index 491409c..84740f6 100644
--- a/apps/backend/src/common/decorators/user-id.decorator.ts
+++ b/apps/backend/src/common/decorators/user-id.decorator.ts
@@ -1,7 +1,7 @@
 import { createParamDecorator, type ExecutionContext } from "@nestjs/common";
 import type { Request } from "express";
 
-export const UserIdDecorator = createParamDecorator(
+export const UserId = createParamDecorator(
 	(_data: unknown, ctx: ExecutionContext) => {
 		const request = ctx.switchToHttp().getRequest<Request>();
 		return request.user;
diff --git a/apps/backend/src/common/filters/catch-everything.filter.ts b/apps/backend/src/common/filters/catch-everything.filter.ts
index 8ca2ffd..a7dd8e0 100644
--- a/apps/backend/src/common/filters/catch-everything.filter.ts
+++ b/apps/backend/src/common/filters/catch-everything.filter.ts
@@ -11,9 +11,9 @@ import {
 import { ConfigService } from "@nestjs/config";
 import { HttpAdapterHost } from "@nestjs/core";
 import type { Prisma } from "@prisma/generated/client.js";
-import type { EnvironmentType } from "../../core/config/types/environment.type.js";
-import { ConfigKeyConstant } from "../constants/config-key.constant.js";
-import { EnvironmentsConstant } from "../constants/environments.constant.js";
+import type { EnvironmentRegisterType } from "../../core/config/types/environment.register.type.js";
+import { CONFIG_KEY } from "../constants/config-key.constant.js";
+import { ENVIRONMENTS } from "../constants/environments.constant.js";
 import type {
 	ErrorResponseBodyType,
 	HttpExceptionResponseType,
@@ -40,12 +40,11 @@ export class CatchEverythingFilter implements ExceptionFilter {
 		@Inject(HttpAdapterHost) private readonly httpAdapterHost: HttpAdapterHost,
 		@Inject(ConfigService) readonly configService: ConfigService,
 	) {
-		const environmentConfig = configService.getOrThrow<EnvironmentType>(
-			ConfigKeyConstant.environment,
+		const environmentConfig = configService.getOrThrow<EnvironmentRegisterType>(
+			CONFIG_KEY.environment,
 		);
 
-		this.isProduction =
-			environmentConfig.nodeEnv === EnvironmentsConstant.production;
+		this.isProduction = environmentConfig.nodeEnv === ENVIRONMENTS.production;
 	}
 
 	catch(exception: unknown, host: ArgumentsHost): void {
diff --git a/apps/backend/src/common/interceptors/logger.interceptor.ts b/apps/backend/src/common/interceptors/logger.interceptor.ts
index d637927..f2a16be 100644
--- a/apps/backend/src/common/interceptors/logger.interceptor.ts
+++ b/apps/backend/src/common/interceptors/logger.interceptor.ts
@@ -10,9 +10,9 @@ import {
 import { ConfigService } from "@nestjs/config";
 import type { Request, Response } from "express";
 import { type Observable, tap } from "rxjs";
-import type { EnvironmentType } from "../../core/config/types/environment.type.js";
-import { ConfigKeyConstant } from "../constants/config-key.constant.js";
-import { EnvironmentsConstant } from "../constants/environments.constant.js";
+import type { EnvironmentRegisterType } from "../../core/config/types/environment.register.type.js";
+import { CONFIG_KEY } from "../constants/config-key.constant.js";
+import { ENVIRONMENTS } from "../constants/environments.constant.js";
 
 type LoggerExpressionType = "incoming" | "error" | "success";
 
@@ -22,12 +22,11 @@ export class LoggingInterceptor implements NestInterceptor {
 	private readonly isProduction: boolean;
 
 	constructor(@Inject(ConfigService) readonly configService: ConfigService) {
-		const environmentConfig = configService.getOrThrow<EnvironmentType>(
-			ConfigKeyConstant.environment,
+		const environmentConfig = configService.getOrThrow<EnvironmentRegisterType>(
+			CONFIG_KEY.environment,
 		);
 
-		this.isProduction =
-			environmentConfig.nodeEnv === EnvironmentsConstant.production;
+		this.isProduction = environmentConfig.nodeEnv === ENVIRONMENTS.production;
 	}
 
 	intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
diff --git a/apps/backend/src/common/interceptors/timeout.interceptor.ts b/apps/backend/src/common/interceptors/timeout.interceptor.ts
index e1ac6a5..7b3651a 100644
--- a/apps/backend/src/common/interceptors/timeout.interceptor.ts
+++ b/apps/backend/src/common/interceptors/timeout.interceptor.ts
@@ -14,15 +14,15 @@ import {
 	throwError,
 	timeout,
 } from "rxjs";
-import type { AppType } from "../../core/config/types/app.type.js";
-import { ConfigKeyConstant } from "../constants/config-key.constant.js";
+import type { AppRegisterType } from "../../core/config/types/app.register.type.js";
+import { CONFIG_KEY } from "../constants/config-key.constant.js";
 
 @Injectable()
 export class TimeoutInterceptor implements NestInterceptor {
 	private readonly appRequestTimeout: number;
 
 	constructor(@Inject(ConfigService) readonly configService: ConfigService) {
-		const appConfig = configService.getOrThrow<AppType>(ConfigKeyConstant.app);
+		const appConfig = configService.getOrThrow<AppRegisterType>(CONFIG_KEY.app);
 
 		this.appRequestTimeout = appConfig.appRequestTimeout;
 	}
diff --git a/apps/backend/src/common/strategies/jwt.strategy.ts b/apps/backend/src/common/strategies/jwt.strategy.ts
index a12fdec..3e9c999 100644
--- a/apps/backend/src/common/strategies/jwt.strategy.ts
+++ b/apps/backend/src/common/strategies/jwt.strategy.ts
@@ -2,9 +2,9 @@ import { Inject, Injectable, UnauthorizedException } from "@nestjs/common";
 import { ConfigService } from "@nestjs/config";
 import { PassportStrategy } from "@nestjs/passport";
 import { ExtractJwt, Strategy } from "passport-jwt";
-import type { JwtType } from "../../core/config/types/jwt.type.js";
+import type { JwtRegisterType } from "../../core/config/types/jwt.register.type.js";
 import { AuthRepository } from "../../modules/auth/auth.repository.js";
-import { ConfigKeyConstant } from "../constants/config-key.constant.js";
+import { CONFIG_KEY } from "../constants/config-key.constant.js";
 
 @Injectable()
 export class JwtStrategy extends PassportStrategy(Strategy, "jwt") {
@@ -12,7 +12,7 @@ export class JwtStrategy extends PassportStrategy(Strategy, "jwt") {
 		@Inject(AuthRepository) private readonly authRepository: AuthRepository,
 		@Inject(ConfigService) readonly configService: ConfigService,
 	) {
-		const jwtConfig = configService.getOrThrow<JwtType>(ConfigKeyConstant.jwt);
+		const jwtConfig = configService.getOrThrow<JwtRegisterType>(CONFIG_KEY.jwt);
 
 		super({
 			ignoreExpiration: false,
diff --git a/apps/backend/src/common/types/auth-payload.type.ts b/apps/backend/src/common/types/auth-payload.type.ts
index 6d016be..684bbea 100644
--- a/apps/backend/src/common/types/auth-payload.type.ts
+++ b/apps/backend/src/common/types/auth-payload.type.ts
@@ -1,5 +1,5 @@
-type AuthPayload = {
+type AuthPayloadType = {
 	userId: number;
 };
 
-export type { AuthPayload };
+export type { AuthPayloadType };
diff --git a/apps/backend/src/core/config/config.module.ts b/apps/backend/src/core/config/config.module.ts
index badf07e..2914fbd 100644
--- a/apps/backend/src/core/config/config.module.ts
+++ b/apps/backend/src/core/config/config.module.ts
@@ -4,13 +4,13 @@ import { resolve } from "node:path";
 import { Module } from "@nestjs/common";
 import { ConfigModule as CoreConfigModule } from "@nestjs/config";
 import Joi from "joi";
-import { EnvironmentsConstant } from "../../common/constants/environments.constant";
+import { ENVIRONMENTS } from "../../common/constants/environments.constant";
 import { appRegister } from "./registers/app.register";
+import { cacheRegister } from "./registers/cache.register";
+import { databaseRegister } from "./registers/database.register";
 import { environmentRegister } from "./registers/environment.register";
 import { jwtRegister } from "./registers/jwt.register";
-import { prismaRegister } from "./registers/prisma.register";
 import { rateLimitRegister } from "./registers/rate-limit.register";
-import { redisRegister } from "./registers/redis.register";
 import { s3Register } from "./registers/s3.register";
 
 @Module({
@@ -22,16 +22,16 @@ import { s3Register } from "./registers/s3.register";
 			],
 			isGlobal: false,
 			load: [
-				redisRegister,
+				cacheRegister,
 				appRegister,
-				prismaRegister,
+				databaseRegister,
 				environmentRegister,
 				jwtRegister,
 				rateLimitRegister,
 				s3Register,
 			],
 			validationSchema: Joi.object({
-				NODE_ENV: Joi.string().default(EnvironmentsConstant.local),
+				NODE_ENV: Joi.string().default(ENVIRONMENTS.local),
 
 				APP_PORT: Joi.number().port().positive().required(),
 				APP_REQUEST_TIMEOUT: Joi.number().positive().required(),
diff --git a/apps/backend/src/core/config/registers/app.register.ts b/apps/backend/src/core/config/registers/app.register.ts
index 79208f1..9f9d45d 100644
--- a/apps/backend/src/core/config/registers/app.register.ts
+++ b/apps/backend/src/core/config/registers/app.register.ts
@@ -1,8 +1,8 @@
 import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant.js";
-import type { AppType } from "../types/app.type.js";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant.js";
+import type { AppRegisterType } from "../types/app.register.type.js";
 
-export const appRegister = registerAs(ConfigKeyConstant.app, (): AppType => {
+export const appRegister = registerAs(CONFIG_KEY.app, (): AppRegisterType => {
 	const appDescription = process.env.APP_DESCRIPTION;
 	const appName = process.env.APP_NAME;
 	const appPort = Number(process.env.APP_PORT);
diff --git a/apps/backend/src/core/config/registers/cache.register.ts b/apps/backend/src/core/config/registers/cache.register.ts
new file mode 100644
index 0000000..0f7c700
--- /dev/null
+++ b/apps/backend/src/core/config/registers/cache.register.ts
@@ -0,0 +1,18 @@
+import { registerAs } from "@nestjs/config";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { CacheRegisterType } from "../types/cache.register.type";
+
+export const cacheRegister = registerAs(
+	CONFIG_KEY.redis,
+	(): CacheRegisterType => {
+		const redisUrl = process.env.REDIS_URL;
+
+		if (!redisUrl) {
+			throw new Error("Missing some env");
+		}
+
+		return {
+			redisUrl,
+		};
+	},
+);
diff --git a/apps/backend/src/core/config/registers/database.register.ts b/apps/backend/src/core/config/registers/database.register.ts
new file mode 100644
index 0000000..c92b0c7
--- /dev/null
+++ b/apps/backend/src/core/config/registers/database.register.ts
@@ -0,0 +1,18 @@
+import { registerAs } from "@nestjs/config";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { DatabaseRegisterType } from "../types/database.register.type";
+
+export const databaseRegister = registerAs(
+	CONFIG_KEY.prisma,
+	(): DatabaseRegisterType => {
+		const postgresUrl = process.env.POSTGRES_URL;
+
+		if (!postgresUrl) {
+			throw new Error("Missing some envs");
+		}
+
+		return {
+			postgresUrl,
+		};
+	},
+);
diff --git a/apps/backend/src/core/config/registers/environment.register.ts b/apps/backend/src/core/config/registers/environment.register.ts
index 2730876..a6f133a 100644
--- a/apps/backend/src/core/config/registers/environment.register.ts
+++ b/apps/backend/src/core/config/registers/environment.register.ts
@@ -1,10 +1,10 @@
 import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { EnvironmentType } from "../types/environment.type";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { EnvironmentRegisterType } from "../types/environment.register.type";
 
 export const environmentRegister = registerAs(
-	ConfigKeyConstant.environment,
-	(): EnvironmentType => {
+	CONFIG_KEY.environment,
+	(): EnvironmentRegisterType => {
 		const nodeEnv = process.env.NODE_ENV;
 
 		if (!nodeEnv) {
diff --git a/apps/backend/src/core/config/registers/jwt.register.ts b/apps/backend/src/core/config/registers/jwt.register.ts
index b144012..007ff1e 100644
--- a/apps/backend/src/core/config/registers/jwt.register.ts
+++ b/apps/backend/src/core/config/registers/jwt.register.ts
@@ -1,8 +1,8 @@
 import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { JwtType } from "../types/jwt.type";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { JwtRegisterType } from "../types/jwt.register.type";
 
-export const jwtRegister = registerAs(ConfigKeyConstant.jwt, (): JwtType => {
+export const jwtRegister = registerAs(CONFIG_KEY.jwt, (): JwtRegisterType => {
 	const expiresIn = Number(process.env.JWT_EXPIRES_IN);
 	const secret = process.env.JWT_SECRET;
 
diff --git a/apps/backend/src/core/config/registers/prisma.register.ts b/apps/backend/src/core/config/registers/prisma.register.ts
deleted file mode 100644
index ed245d2..0000000
--- a/apps/backend/src/core/config/registers/prisma.register.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { PrismaType } from "../types/prisma.type";
-
-export const prismaRegister = registerAs(
-	ConfigKeyConstant.prisma,
-	(): PrismaType => {
-		const postgresUrl = process.env.POSTGRES_URL;
-
-		if (!postgresUrl) {
-			throw new Error("Missing some envs");
-		}
-
-		return {
-			postgresUrl,
-		};
-	},
-);
diff --git a/apps/backend/src/core/config/registers/rate-limit.register.ts b/apps/backend/src/core/config/registers/rate-limit.register.ts
index 8bc878b..9ead23c 100644
--- a/apps/backend/src/core/config/registers/rate-limit.register.ts
+++ b/apps/backend/src/core/config/registers/rate-limit.register.ts
@@ -1,10 +1,10 @@
 import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { RateLimitType } from "../types/rate-limit.type";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { RateLimitRegisterType } from "../types/rate-limit.register.type";
 
 export const rateLimitRegister = registerAs(
-	ConfigKeyConstant.rateLimit,
-	(): RateLimitType => {
+	CONFIG_KEY.rateLimit,
+	(): RateLimitRegisterType => {
 		const limit = Number(process.env.THROTTLE_LIMIT);
 		const ttl = Number(process.env.THROTTLE_TTL);
 
diff --git a/apps/backend/src/core/config/registers/redis.register.ts b/apps/backend/src/core/config/registers/redis.register.ts
deleted file mode 100644
index 2b5ffb8..0000000
--- a/apps/backend/src/core/config/registers/redis.register.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { RedisType } from "../types/redis.type";
-
-export const redisRegister = registerAs(
-	ConfigKeyConstant.redis,
-	(): RedisType => {
-		const redisUrl = process.env.REDIS_URL;
-
-		if (!redisUrl) {
-			throw new Error("Missing some env");
-		}
-
-		return {
-			redisUrl,
-		};
-	},
-);
diff --git a/apps/backend/src/core/config/registers/s3.register.ts b/apps/backend/src/core/config/registers/s3.register.ts
index c6780d9..13beb58 100644
--- a/apps/backend/src/core/config/registers/s3.register.ts
+++ b/apps/backend/src/core/config/registers/s3.register.ts
@@ -1,8 +1,8 @@
 import { registerAs } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../../common/constants/config-key.constant";
-import type { S3Type } from "../types/s3.type";
+import { CONFIG_KEY } from "../../../common/constants/config-key.constant";
+import type { S3RegisterType } from "../types/s3.register.type";
 
-export const s3Register = registerAs(ConfigKeyConstant.s3, (): S3Type => {
+export const s3Register = registerAs(CONFIG_KEY.s3, (): S3RegisterType => {
 	const awsRegion = process.env.AWS_REGION;
 	const awsAccessKeyId = process.env.AWS_ACCESS_KEY_ID;
 	const awsSecretAccessKey = process.env.AWS_SECRET_ACCESS_KEY;
diff --git a/apps/backend/src/core/config/types/app.type.ts b/apps/backend/src/core/config/types/app.register.type.ts
similarity index 77%
rename from apps/backend/src/core/config/types/app.type.ts
rename to apps/backend/src/core/config/types/app.register.type.ts
index 53581db..a5e622b 100644
--- a/apps/backend/src/core/config/types/app.type.ts
+++ b/apps/backend/src/core/config/types/app.register.type.ts
@@ -1,4 +1,4 @@
-type AppType = {
+type AppRegisterType = {
 	appPort: number;
 	appRequestTimeout: number;
 	appName: string;
@@ -9,4 +9,4 @@ type AppType = {
 	appCorsOrigin: string;
 };
 
-export type { AppType };
+export type { AppRegisterType };
diff --git a/apps/backend/src/core/config/types/cache.register.type.ts b/apps/backend/src/core/config/types/cache.register.type.ts
new file mode 100644
index 0000000..efe3037
--- /dev/null
+++ b/apps/backend/src/core/config/types/cache.register.type.ts
@@ -0,0 +1,5 @@
+type CacheRegisterType = {
+	redisUrl: string;
+};
+
+export type { CacheRegisterType };
diff --git a/apps/backend/src/core/config/types/database.register.type.ts b/apps/backend/src/core/config/types/database.register.type.ts
new file mode 100644
index 0000000..acf12b5
--- /dev/null
+++ b/apps/backend/src/core/config/types/database.register.type.ts
@@ -0,0 +1,5 @@
+type DatabaseRegisterType = {
+	postgresUrl: string;
+};
+
+export type { DatabaseRegisterType };
diff --git a/apps/backend/src/core/config/types/environment.register.type.ts b/apps/backend/src/core/config/types/environment.register.type.ts
new file mode 100644
index 0000000..56be19d
--- /dev/null
+++ b/apps/backend/src/core/config/types/environment.register.type.ts
@@ -0,0 +1,5 @@
+type EnvironmentRegisterType = {
+	nodeEnv: string;
+};
+
+export type { EnvironmentRegisterType };
diff --git a/apps/backend/src/core/config/types/environment.type.ts b/apps/backend/src/core/config/types/environment.type.ts
deleted file mode 100644
index 615061c..0000000
--- a/apps/backend/src/core/config/types/environment.type.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-type EnvironmentType = {
-	nodeEnv: string;
-};
-
-export type { EnvironmentType };
diff --git a/apps/backend/src/core/config/types/jwt.register.type.ts b/apps/backend/src/core/config/types/jwt.register.type.ts
new file mode 100644
index 0000000..bba5346
--- /dev/null
+++ b/apps/backend/src/core/config/types/jwt.register.type.ts
@@ -0,0 +1,6 @@
+type JwtRegisterType = {
+	secret: string;
+	expiresIn: number;
+};
+
+export type { JwtRegisterType };
diff --git a/apps/backend/src/core/config/types/jwt.type.ts b/apps/backend/src/core/config/types/jwt.type.ts
deleted file mode 100644
index 34cd279..0000000
--- a/apps/backend/src/core/config/types/jwt.type.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-type JwtType = {
-	secret: string;
-	expiresIn: number;
-};
-
-export type { JwtType };
diff --git a/apps/backend/src/core/config/types/prisma.type.ts b/apps/backend/src/core/config/types/prisma.type.ts
deleted file mode 100644
index 8bdbaba..0000000
--- a/apps/backend/src/core/config/types/prisma.type.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-type PrismaType = {
-	postgresUrl: string;
-};
-
-export type { PrismaType };
diff --git a/apps/backend/src/core/config/types/rate-limit.register.type.ts b/apps/backend/src/core/config/types/rate-limit.register.type.ts
new file mode 100644
index 0000000..4a52385
--- /dev/null
+++ b/apps/backend/src/core/config/types/rate-limit.register.type.ts
@@ -0,0 +1,6 @@
+type RateLimitRegisterType = {
+	ttl: number;
+	limit: number;
+};
+
+export type { RateLimitRegisterType };
diff --git a/apps/backend/src/core/config/types/rate-limit.type.ts b/apps/backend/src/core/config/types/rate-limit.type.ts
deleted file mode 100644
index e3c055e..0000000
--- a/apps/backend/src/core/config/types/rate-limit.type.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-type RateLimitType = {
-	ttl: number;
-	limit: number;
-};
-
-export type { RateLimitType };
diff --git a/apps/backend/src/core/config/types/redis.type.ts b/apps/backend/src/core/config/types/redis.type.ts
deleted file mode 100644
index 9112226..0000000
--- a/apps/backend/src/core/config/types/redis.type.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-type RedisType = {
-	redisUrl: string;
-};
-
-export type { RedisType };
diff --git a/apps/backend/src/core/config/types/s3.type.ts b/apps/backend/src/core/config/types/s3.register.type.ts
similarity index 65%
rename from apps/backend/src/core/config/types/s3.type.ts
rename to apps/backend/src/core/config/types/s3.register.type.ts
index 0ab8544..cf22f49 100644
--- a/apps/backend/src/core/config/types/s3.type.ts
+++ b/apps/backend/src/core/config/types/s3.register.type.ts
@@ -1,8 +1,8 @@
-type S3Type = {
+type S3RegisterType = {
 	awsRegion: string;
 	awsAccessKeyId: string;
 	awsSecretAccessKey: string;
 	awsS3BucketName: string;
 };
 
-export type { S3Type };
+export type { S3RegisterType };
diff --git a/apps/backend/src/core/database/database.module.ts b/apps/backend/src/core/database/database.module.ts
new file mode 100644
index 0000000..d0ad629
--- /dev/null
+++ b/apps/backend/src/core/database/database.module.ts
@@ -0,0 +1,10 @@
+import { Module } from "@nestjs/common";
+import { ConfigModule } from "../config/config.module.js";
+import { DatabaseService } from "./database.service.js";
+
+@Module({
+	imports: [ConfigModule],
+	exports: [DatabaseService],
+	providers: [DatabaseService],
+})
+export class DatabaseModule {}
diff --git a/apps/backend/src/core/prisma/prisma.service.ts b/apps/backend/src/core/database/database.service.ts
similarity index 70%
rename from apps/backend/src/core/prisma/prisma.service.ts
rename to apps/backend/src/core/database/database.service.ts
index d5d1321..a001697 100644
--- a/apps/backend/src/core/prisma/prisma.service.ts
+++ b/apps/backend/src/core/database/database.service.ts
@@ -7,17 +7,17 @@ import {
 import { ConfigService } from "@nestjs/config";
 import { PrismaPg } from "@prisma/adapter-pg";
 import { PrismaClient } from "../../../prisma/generated/client.js";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant.js";
-import type { PrismaType } from "../config/types/prisma.type.js";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant.js";
+import type { DatabaseRegisterType } from "../config/types/database.register.type.js";
 
 @Injectable()
-export class PrismaService
+export class DatabaseService
 	extends PrismaClient
 	implements OnModuleInit, OnModuleDestroy
 {
 	constructor(@Inject(ConfigService) readonly configService: ConfigService) {
-		const prismaConfig = configService.getOrThrow<PrismaType>(
-			ConfigKeyConstant.prisma,
+		const prismaConfig = configService.getOrThrow<DatabaseRegisterType>(
+			CONFIG_KEY.prisma,
 		);
 
 		const adapter: PrismaPg = new PrismaPg({
diff --git a/apps/backend/src/core/health-checks/health-checks.module.ts b/apps/backend/src/core/health-checks/health-checks.module.ts
index 384871e..109ed0f 100644
--- a/apps/backend/src/core/health-checks/health-checks.module.ts
+++ b/apps/backend/src/core/health-checks/health-checks.module.ts
@@ -1,13 +1,13 @@
 import { Module } from "@nestjs/common";
 import { TerminusModule } from "@nestjs/terminus";
-import { PrismaModule } from "../prisma/prisma.module.js";
+import { DatabaseModule } from "../database/database.module.js";
 import { RedisModule } from "../redis/redis.module.js";
 import { HealthChecksController } from "./health-checks.controller.js";
 import { HealthChecksService } from "./health-checks.service.js";
 
 @Module({
 	controllers: [HealthChecksController],
-	imports: [TerminusModule, PrismaModule, RedisModule],
+	imports: [TerminusModule, DatabaseModule, RedisModule],
 	providers: [HealthChecksService],
 })
 export class HealthChecksModule {}
diff --git a/apps/backend/src/core/health-checks/health-checks.service.ts b/apps/backend/src/core/health-checks/health-checks.service.ts
index bf71d2d..244ac6d 100644
--- a/apps/backend/src/core/health-checks/health-checks.service.ts
+++ b/apps/backend/src/core/health-checks/health-checks.service.ts
@@ -9,7 +9,7 @@ import {
 } from "@nestjs/terminus";
 import { InjectRedis } from "@nestjs-modules/ioredis";
 import type { Redis } from "ioredis";
-import { PrismaService } from "../prisma/prisma.service.js";
+import { DatabaseService } from "../database/database.service.js";
 
 @Injectable()
 export class HealthChecksService {
@@ -19,7 +19,7 @@ export class HealthChecksService {
 		private readonly healthCheckService: HealthCheckService,
 		@Inject(PrismaHealthIndicator)
 		private readonly prismaHealthIndicator: PrismaHealthIndicator,
-		@Inject(PrismaService) private readonly prismaService: PrismaService,
+		@Inject(DatabaseService) private readonly prismaService: DatabaseService,
 		@Inject(HealthIndicatorService)
 		readonly healthIndicatorService: HealthIndicatorService,
 	) {}
diff --git a/apps/backend/src/core/jwt/jwt.module.ts b/apps/backend/src/core/jwt/jwt.module.ts
index 5bcbf02..30ea61b 100644
--- a/apps/backend/src/core/jwt/jwt.module.ts
+++ b/apps/backend/src/core/jwt/jwt.module.ts
@@ -1,8 +1,8 @@
 import { Module } from "@nestjs/common";
 import { ConfigModule, ConfigService } from "@nestjs/config";
 import { JwtModule as CoreJwtModule, type JwtModuleOptions } from "@nestjs/jwt";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant.js";
-import type { JwtType } from "../config/types/jwt.type.js";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant.js";
+import type { JwtRegisterType } from "../config/types/jwt.register.type.js";
 
 @Module({
 	imports: [
@@ -10,8 +10,8 @@ import type { JwtType } from "../config/types/jwt.type.js";
 			imports: [ConfigModule],
 			inject: [ConfigService],
 			useFactory: (configService: ConfigService): JwtModuleOptions => {
-				const jwtConfig = configService.getOrThrow<JwtType>(
-					ConfigKeyConstant.jwt,
+				const jwtConfig = configService.getOrThrow<JwtRegisterType>(
+					CONFIG_KEY.jwt,
 				);
 
 				return {
diff --git a/apps/backend/src/core/prisma/prisma.module.ts b/apps/backend/src/core/prisma/prisma.module.ts
deleted file mode 100644
index 47e347c..0000000
--- a/apps/backend/src/core/prisma/prisma.module.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { Module } from "@nestjs/common";
-import { ConfigModule } from "../config/config.module.js";
-import { PrismaService } from "./prisma.service.js";
-
-@Module({
-	imports: [ConfigModule],
-	exports: [PrismaService],
-	providers: [PrismaService],
-})
-export class PrismaModule {}
diff --git a/apps/backend/src/core/rate-limit/rate-limit.module.ts b/apps/backend/src/core/rate-limit/rate-limit.module.ts
index a6204e4..76e1405 100644
--- a/apps/backend/src/core/rate-limit/rate-limit.module.ts
+++ b/apps/backend/src/core/rate-limit/rate-limit.module.ts
@@ -2,8 +2,8 @@ import { Module } from "@nestjs/common";
 import { ConfigModule, ConfigService } from "@nestjs/config";
 import { APP_GUARD } from "@nestjs/core";
 import { seconds, ThrottlerGuard, ThrottlerModule } from "@nestjs/throttler";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant.js";
-import type { RateLimitType } from "../config/types/rate-limit.type.js";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant.js";
+import type { RateLimitRegisterType } from "../config/types/rate-limit.register.type.js";
 
 @Module({
 	imports: [
@@ -11,8 +11,8 @@ import type { RateLimitType } from "../config/types/rate-limit.type.js";
 			imports: [ConfigModule],
 			inject: [ConfigService],
 			useFactory: (configService: ConfigService) => {
-				const rateLimitConfig = configService.getOrThrow<RateLimitType>(
-					ConfigKeyConstant.rateLimit,
+				const rateLimitConfig = configService.getOrThrow<RateLimitRegisterType>(
+					CONFIG_KEY.rateLimit,
 				);
 
 				return {
diff --git a/apps/backend/src/core/redis/redis.module.ts b/apps/backend/src/core/redis/redis.module.ts
index 5a85d85..b94423f 100644
--- a/apps/backend/src/core/redis/redis.module.ts
+++ b/apps/backend/src/core/redis/redis.module.ts
@@ -1,8 +1,8 @@
 import { Module } from "@nestjs/common";
 import { ConfigModule, ConfigService } from "@nestjs/config";
 import { RedisModule as CoreRedisModule } from "@nestjs-modules/ioredis";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant.js";
-import type { RedisType } from "../config/types/redis.type.js";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant.js";
+import type { CacheRegisterType } from "../config/types/cache.register.type.js";
 import { RedisService } from "./redis.service.js";
 
 @Module({
@@ -12,8 +12,8 @@ import { RedisService } from "./redis.service.js";
 			imports: [ConfigModule],
 			inject: [ConfigService],
 			useFactory: (configService: ConfigService) => {
-				const redisConfig = configService.getOrThrow<RedisType>(
-					ConfigKeyConstant.redis,
+				const redisConfig = configService.getOrThrow<CacheRegisterType>(
+					CONFIG_KEY.redis,
 				);
 
 				return {
diff --git a/apps/backend/src/core/s3/s3.service.ts b/apps/backend/src/core/s3/s3.service.ts
index 798093f..5ed7cb8 100644
--- a/apps/backend/src/core/s3/s3.service.ts
+++ b/apps/backend/src/core/s3/s3.service.ts
@@ -8,8 +8,8 @@ import {
 // import { getSignedUrl } from "@aws-sdk/s3-request-presigner";
 import { Inject, Injectable } from "@nestjs/common";
 import { ConfigService } from "@nestjs/config";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant";
-import type { S3Type } from "../config/types/s3.type";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant";
+import type { S3RegisterType } from "../config/types/s3.register.type";
 
 @Injectable()
 export class S3Service {
@@ -18,7 +18,7 @@ export class S3Service {
 	private readonly region: string;
 
 	constructor(@Inject(ConfigService) readonly configService: ConfigService) {
-		const s3Config = configService.getOrThrow<S3Type>(ConfigKeyConstant.s3);
+		const s3Config = configService.getOrThrow<S3RegisterType>(CONFIG_KEY.s3);
 
 		this.s3Client = new S3Client({
 			credentials: {
diff --git a/apps/backend/src/main.ts b/apps/backend/src/main.ts
index 205f46f..9f3e878 100644
--- a/apps/backend/src/main.ts
+++ b/apps/backend/src/main.ts
@@ -10,13 +10,13 @@ import type { NestExpressApplication } from "@nestjs/platform-express";
 import { DocumentBuilder, SwaggerModule } from "@nestjs/swagger";
 import helmet from "helmet";
 import { AppModule } from "./app.module.js";
-import { ConfigKeyConstant } from "./common/constants/config-key.constant.js";
-import { EnvironmentsConstant } from "./common/constants/environments.constant.js";
+import { CONFIG_KEY } from "./common/constants/config-key.constant.js";
+import { ENVIRONMENTS } from "./common/constants/environments.constant.js";
 import { CatchEverythingFilter } from "./common/filters/catch-everything.filter.js";
 import { LoggingInterceptor } from "./common/interceptors/logger.interceptor.js";
 import { TimeoutInterceptor } from "./common/interceptors/timeout.interceptor.js";
-import type { AppType } from "./core/config/types/app.type.js";
-import type { EnvironmentType } from "./core/config/types/environment.type.js";
+import type { AppRegisterType } from "./core/config/types/app.register.type.js";
+import type { EnvironmentRegisterType } from "./core/config/types/environment.register.type.js";
 
 const logger: Logger = new Logger("Bootstrap");
 
@@ -25,14 +25,13 @@ const logger: Logger = new Logger("Bootstrap");
 
 	const configService = app.get(ConfigService);
 
-	const environmentConfig = configService.getOrThrow<EnvironmentType>(
-		ConfigKeyConstant.environment,
+	const environmentConfig = configService.getOrThrow<EnvironmentRegisterType>(
+		CONFIG_KEY.environment,
 	);
 
-	const isProduction =
-		environmentConfig.nodeEnv === EnvironmentsConstant.production;
+	const isProduction = environmentConfig.nodeEnv === ENVIRONMENTS.production;
 
-	const appConfig = configService.getOrThrow<AppType>(ConfigKeyConstant.app);
+	const appConfig = configService.getOrThrow<AppRegisterType>(CONFIG_KEY.app);
 
 	app.enableVersioning({
 		defaultVersion: "1",
@@ -47,10 +46,7 @@ const logger: Logger = new Logger("Bootstrap");
 			.setTitle(appConfig.appName)
 			.setDescription(appConfig.appDescription)
 			.setVersion("1.0")
-			.addServer(
-				`http://localhost:${appConfig.appPort}`,
-				EnvironmentsConstant.local,
-			)
+			.addServer(`http://localhost:${appConfig.appPort}`, ENVIRONMENTS.local)
 			.addBearerAuth(
 				{
 					bearerFormat: "JWT",
diff --git a/apps/backend/src/modules/auth/auth.controller.ts b/apps/backend/src/modules/auth/auth.controller.ts
index b4ab0d0..65fd59f 100644
--- a/apps/backend/src/modules/auth/auth.controller.ts
+++ b/apps/backend/src/modules/auth/auth.controller.ts
@@ -16,7 +16,7 @@ import {
 	ApiTags,
 	ApiUnauthorizedResponse,
 } from "@nestjs/swagger";
-import { UserIdDecorator } from "../../common/decorators/user-id.decorator.js";
+import { UserId } from "../../common/decorators/user-id.decorator.js";
 import { LocalGuard } from "../../common/guards/local.guard.js";
 import { AuthService } from "./auth.service.js";
 import { SignInDto } from "./dtos/sign-in.dto.js";
@@ -48,7 +48,7 @@ export class AuthController {
 	@ApiBody({
 		type: SignInDto,
 	})
-	public signIn(@UserIdDecorator() userId: number): AuthRdo {
+	public signIn(@UserId() userId: number): AuthRdo {
 		return this.authService.signIn(userId);
 	}
 
diff --git a/apps/backend/src/modules/auth/auth.module.ts b/apps/backend/src/modules/auth/auth.module.ts
index e0185ae..028dee0 100644
--- a/apps/backend/src/modules/auth/auth.module.ts
+++ b/apps/backend/src/modules/auth/auth.module.ts
@@ -3,8 +3,8 @@ import { PassportModule } from "@nestjs/passport";
 import { JwtStrategy } from "../../common/strategies/jwt.strategy.js";
 import { LocalStrategy } from "../../common/strategies/local.strategy.js";
 import { ConfigModule } from "../../core/config/config.module.js";
+import { DatabaseModule } from "../../core/database/database.module.js";
 import { JwtModule } from "../../core/jwt/jwt.module.js";
-import { PrismaModule } from "../../core/prisma/prisma.module.js";
 import { AuthController } from "./auth.controller.js";
 import { AuthRepository } from "./auth.repository.js";
 import { AuthService } from "./auth.service.js";
@@ -12,7 +12,7 @@ import { AuthService } from "./auth.service.js";
 @Module({
 	controllers: [AuthController],
 	exports: [AuthService, AuthRepository],
-	imports: [JwtModule, PassportModule, PrismaModule, ConfigModule],
+	imports: [JwtModule, PassportModule, DatabaseModule, ConfigModule],
 	providers: [AuthService, AuthRepository, JwtStrategy, LocalStrategy],
 })
 export class AuthModule {}
diff --git a/apps/backend/src/modules/auth/auth.repository.ts b/apps/backend/src/modules/auth/auth.repository.ts
index a373173..efe845f 100644
--- a/apps/backend/src/modules/auth/auth.repository.ts
+++ b/apps/backend/src/modules/auth/auth.repository.ts
@@ -1,12 +1,12 @@
 import { Inject, Injectable } from "@nestjs/common";
-import { PrismaService } from "../../core/prisma/prisma.service.js";
+import { DatabaseService } from "../../core/database/database.service.js";
 import type { SignUpDto } from "./dtos/sign-up.dto.js";
 import type { UserRdo } from "./rdos/user.rdo.js";
 
 @Injectable()
 export class AuthRepository {
 	constructor(
-		@Inject(PrismaService) private readonly prismaService: PrismaService,
+		@Inject(DatabaseService) private readonly prismaService: DatabaseService,
 	) {}
 
 	public async create(signUpDto: SignUpDto): Promise<UserRdo> {
diff --git a/apps/backend/src/modules/auth/auth.service.ts b/apps/backend/src/modules/auth/auth.service.ts
index 00ffe1c..528b0d4 100644
--- a/apps/backend/src/modules/auth/auth.service.ts
+++ b/apps/backend/src/modules/auth/auth.service.ts
@@ -2,9 +2,9 @@ import { ConflictException, Inject, Injectable } from "@nestjs/common";
 import { ConfigService } from "@nestjs/config";
 import { JwtService } from "@nestjs/jwt";
 import { genSalt, hash } from "bcrypt";
-import { ConfigKeyConstant } from "../../common/constants/config-key.constant.js";
-import type { AuthPayload } from "../../common/types/auth-payload.type.js";
-import type { JwtType } from "../../core/config/types/jwt.type.js";
+import { CONFIG_KEY } from "../../common/constants/config-key.constant.js";
+import type { AuthPayloadType } from "../../common/types/auth-payload.type.js";
+import type { JwtRegisterType } from "../../core/config/types/jwt.register.type.js";
 import { AuthRepository } from "./auth.repository.js";
 import type { SignUpDto } from "./dtos/sign-up.dto.js";
 import { AuthRdo } from "./rdos/auth.rdo.js";
@@ -18,7 +18,7 @@ export class AuthService {
 		@Inject(AuthRepository) private readonly authRepository: AuthRepository,
 		@Inject(ConfigService) readonly configService: ConfigService,
 	) {
-		const jwtConfig = configService.getOrThrow<JwtType>(ConfigKeyConstant.jwt);
+		const jwtConfig = configService.getOrThrow<JwtRegisterType>(CONFIG_KEY.jwt);
 
 		this.jwtSecret = jwtConfig.secret;
 	}
@@ -48,10 +48,13 @@ export class AuthService {
 		return new AuthRdo(token);
 	}
 
-	public async validateToken(token: string): Promise<AuthPayload> {
-		const authPayload = await this.jwtService.verifyAsync<AuthPayload>(token, {
-			secret: this.jwtSecret,
-		});
+	public async validateToken(token: string): Promise<AuthPayloadType> {
+		const authPayload = await this.jwtService.verifyAsync<AuthPayloadType>(
+			token,
+			{
+				secret: this.jwtSecret,
+			},
+		);
 
 		return {
 			userId: authPayload.userId,