Adds database connection logic

docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  postgres:
+    image: postgres:17
+    container_name: molci-db
+    restart: unless-stopped
+    env_file:
+      - ./server/.env
+    environment:
+      POSTGRES_USER: ${DB_USER}
+      POSTGRES_PASSWORD: ${DB_PASSWORD}
+      POSTGRES_DB: ${DB_NAME}
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+volumes:
+  postgres_data:

server/biome.json

@@ -0,0 +1,34 @@
+{
+	"$schema": "https://biomejs.dev/schemas/2.2.0/schema.json",
+	"vcs": {
+		"enabled": false,
+		"clientKind": "git",
+		"useIgnoreFile": false
+	},
+	"files": {
+		"ignoreUnknown": false
+	},
+	"formatter": {
+		"enabled": true,
+		"indentStyle": "tab"
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true
+		}
+	},
+	"javascript": {
+		"formatter": {
+			"quoteStyle": "double"
+		}
+	},
+	"assist": {
+		"enabled": true,
+		"actions": {
+			"source": {
+				"organizeImports": "on"
+			}
+		}
+	}
+}

server/package.json

@@ -1,13 +1,33 @@
 {
-  "name": "server",
+	"name": "server",
-  "version": "1.0.0",
+	"version": "1.0.0",
-  "description": "",
+	"description": "",
-  "main": "index.js",
+	"main": "index.js",
-  "scripts": {
+	"scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+		"dev": "tsx --watch --env-file .env src/index.ts",
-  },
+		"watch": "tsx watch src/index.ts",
-  "keywords": [],
+		"check": "tsc --noEmit",
-  "author": "",
+		"build": "tsc",
-  "license": "ISC",
+		"test": "echo \"Error: no test specified\" && exit 1"
-  "packageManager": "pnpm@10.15.0"
+	},
+	"keywords": [],
+	"author": "",
+	"license": "ISC",
+	"packageManager": "pnpm@10.15.0",
+	"devDependencies": {
+		"@biomejs/biome": "2.2.0",
+		"@tsconfig/strictest": "^2.0.5",
+		"@types/express": "^5.0.3",
+		"@types/jest": "^30.0.0",
+		"@types/node": "^24.3.0",
+		"@types/pg": "^8.15.5",
+		"jest": "^30.0.5",
+		"ts-jest": "^29.4.1",
+		"tsx": "^4.20.4",
+		"typescript": "^5.9.2"
+	},
+	"dependencies": {
+		"express": "^5.1.0",
+		"pg": "^8.16.3"
+	}
 }

server/src/config/db.ts

@@ -0,0 +1,30 @@
+import { Pool } from "pg";
+import { config } from "./env";
+
+let pool: Pool;
+
+const { DB_USER, DB_PASSWORD, DB_NAME } = config;
+
+if (!DB_USER || !DB_PASSWORD || !DB_NAME) {
+	throw new Error("DB_USER, DB_PASSWORD, and DB_NAME must be set");
+}
+
+pool = new Pool({
+	user: config.DB_USER,
+	host: config.DB_HOST,
+	database: config.DB_NAME,
+	password: config.DB_PASSWORD,
+	port: config.DB_PORT,
+});
+
+const connectDB = async () => {
+	try {
+		await pool.connect();
+		console.log("PostgreSQL DATABASE connected");
+	} catch (err) {
+		const error = err as Error;
+		console.error("DB connection error:", error.stack || error.message);
+	}
+};
+
+export { pool, connectDB };

server/src/config/env.ts

@@ -0,0 +1,33 @@
+type EnvMode = "development" | "production" | "test";
+
+interface ProcessEnv {
+	NODE_ENV?: EnvMode;
+	APP_PORT?: string;
+	DB_USER: string;
+	DB_PASSWORD: string;
+	DB_HOST?: string;
+	DB_NAME: string;
+	DB_PORT?: string;
+}
+
+const env = process.env as unknown as ProcessEnv;
+
+function requiredEnv(key: keyof ProcessEnv): string {
+	const value = env[key];
+	if (!value) {
+		throw new Error(`Missing required environment variable: ${key}`);
+	}
+	return value;
+}
+
+export const config = {
+	NODE_ENV: env.NODE_ENV ?? "development",
+	APP_PORT: env.APP_PORT ? Number(env.APP_PORT) : 3000,
+	DB_HOST: env.DB_HOST ?? "localhost",
+	DB_NAME: requiredEnv("DB_NAME"),
+	DB_USER: requiredEnv("DB_USER"),
+	DB_PASSWORD: requiredEnv("DB_PASSWORD"),
+	DB_PORT: env.DB_PORT ? Number(env.DB_PORT) : 5432,
+};
+
+export const isProduction = config.NODE_ENV === "production";

server/src/index.ts

@@ -0,0 +1,26 @@
+import express from "express";
+import { pool } from "./config/db";
+import { config, isProduction } from "./config/env";
+
+const app = express();
+const PORT = config.APP_PORT;
+
+app.use(express.json());
+
+app.get("/ping", async (_req, res) => {
+	try {
+		const result = await pool.query("SELECT NOW()");
+		res.json({ success: true, time: result.rows[0].now });
+	} catch (error) {
+		console.error("Database error:", error);
+		res
+			.status(500)
+			.json({ success: false, error: "Database connection failed" });
+	}
+});
+
+app.listen(PORT, () => {
+	console.log(
+		`Server running in ${isProduction ? "production" : "development"} mode on port ${PORT}`,
+	);
+});

server/tsconfig.json

@@ -0,0 +1,29 @@
+{
+	"extends": "@tsconfig/strictest/tsconfig.json",
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "NodeNext",
+		"moduleResolution": "NodeNext",
+		"rootDir": "src",
+		"outDir": "dist",
+		"strict": true,
+		"allowUnusedLabels": false,
+		"allowUnreachableCode": false,
+		"exactOptionalPropertyTypes": true,
+		"noFallthroughCasesInSwitch": true,
+		"noImplicitOverride": true,
+		"noImplicitReturns": true,
+		"noPropertyAccessFromIndexSignature": true,
+		"noUncheckedIndexedAccess": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"isolatedModules": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true
+	},
+	"include": ["src"],
+	"exclude": ["node_modules", "dist"],
+	"$schema": "https://json.schemastore.org/tsconfig",
+	"_version": "2.0.0"
+}