diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2658d7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules/
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..21144c5
--- /dev/null
+++ b/app.js
@@ -0,0 +1,595 @@
+const express = require('express');
+const pgp = require('pg-promise')();
+const session = require('express-session');
+const responseTime = require('response-time');
+const types = require('pg').types;
+const validator = require('validator');
+
+const app = express();
+const db = pgp('postgres://postgres:99postgres11@localhost:5432/skrytka');
+
+const port = 3000;
+
+class Point {
+	x;
+	y;
+
+	constructor(x, y) {
+		this.x = x;
+		this.y = y;
+	}
+}
+
+class Rectangle {
+	leftBottomPoint;
+	size;
+
+	constructor(leftBottomPoint, size) {
+		this.leftBottomPoint = leftBottomPoint;
+		this.size = size;
+	}
+}
+
+types.setTypeParser(603, function(rectangleStr) {
+	rectangleStr = rectangleStr.slice(1, rectangleStr.length - 1);
+	const pointStrs = rectangleStr.split('),(');
+	const fp = pointStrs[0].split(',');
+	const sp = pointStrs[1].split(',');
+
+	const lowerBottomPoint = new Point(+sp[0], +sp[1]);
+	const size = new Point(+fp[0] - (+sp[0]), +fp[1] - (+sp[1]));
+
+	return new Rectangle(lowerBottomPoint, size);
+});
+
+app.use(session({
+	store: new (require('connect-pg-simple')(session))({
+		pgPromise: db,
+		tableName: 'user_session'
+	}),
+	secret: 'tujakistajnysekretnietakijakto',
+	resave: false,
+	saveUninitialized: false,
+	cookie: {
+		sameSite: 'lax',
+		// Age of cookie is counted from last access, so here 30 days of *not using* = deletion
+		maxAge: 30 * 24 * 60 * 60 * 1000 
+	}
+}));
+
+let latencies = [0];
+const MAX_LATENCIES = 25;
+
+app.use(responseTime(function(req, res, time) {
+	if(latencies.length > MAX_LATENCIES) {
+		latencies.shift();
+	}
+	latencies.push(time);
+}));
+
+app.use(express.json());
+
+app.get('/ping', (req, res) => {
+	let latenciesSum = 0;
+	latencies.forEach(l => latenciesSum += l);
+	const avgLatency = latenciesSum / latencies.length;
+
+	res.status(200);
+	res.send(`Pong! (average latency: ${avgLatency}ms)`);
+});
+
+/* Getting OSP units of provided prefix
+ * e.g. https://skrytka.app/osp-units?prefix=Gda
+ * Returns 3 matching results sorted by locality, name.*/
+app.get('/osp-units', async (req, res) => {
+	const localityPrefix = req.query['locality-prefix'];
+
+	if(!localityPrefix) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'locality-prefix': ['Nie podano parametru!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	// DECIDE: Whether to remove some database constraints and add more simple checks here from validator?
+	// Also are these database constraints reasonable?
+
+	try {
+		const unitsList = await db.any('SELECT id AS "ID", name, locality FROM get_units_list($1)', [localityPrefix]);
+		res.status(200);
+		res.json(unitsList);
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+	}
+});
+
+/* Users should be taken from session, not from query parameter
+* 1. If user is not logged in then his scores are saved in session data. For such user we pass trucks list with appropriate scores calculated from
+* that session data and not taken from database. QUESTION: Aren't there solutions that can use already existing database and not create another
+* scheme of data? Or maybe that little redundancy is acceptable :]
+* 2. If user is logged in then his nickname is in session data. We can use it to call database server function and get needed results. */
+// TODO: Add timestamp to results
+app.get('/fire-trucks', async (req, res) => {
+	const ospUnit = req.query['osp-unit'];
+
+	if(!ospUnit) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'osp-unit': ['Nie podano parametru!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	// Do we need these additional checks before sending to database? Probably not...
+	// But it is better to know if result is empty because it is just answer to our question
+	// and without validation before query we can get empty result because of some undetermined error
+
+	if(!validator.isNumeric(ospUnit, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'osp-unit': ['Podane ID musi być liczbą (całkowitą)!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(ospUnit <= 0) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'osp-unit': ['Podane ID musi być większe od 0!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	try {
+		const unitExists = (await db.any('SELECT id FROM osp_unit WHERE id = $1', [ospUnit])).length != 0;
+		if(!unitExists) {
+			res.status(404);
+			res.json({
+				queryErrors: {
+					'osp-unit': ['Jednostka o podanym ID nie istnieje!']
+				},
+				otherErrors: []
+			});
+			return;
+		}
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+		return;
+	}
+	
+	let user = req.session['accountNickname'];
+	const loggedIn = user ?? false;
+
+	if(loggedIn) {
+		try {
+			const trucksList = await db.func('get_trucks_list_with_scores', [ospUnit, user]);
+			res.status(200);
+			res.json(trucksList);
+		} catch(error) {
+			console.log(error);
+			res.status(500);
+			res.json({
+				queryErrors: {},
+				otherErrors: ['Wystąpił błąd serwera!']
+			});
+		}
+	} else {
+		try {
+			const trucksList = await db.any('SELECT id AS "ID", name, image_path AS "imagePath" FROM fire_truck WHERE osp_unit_id = $1', [ospUnit]);
+			let avgPercents = {};
+
+			// We assume that scores in session are pushed in order from oldest to latest
+			// so we need to:
+			// 1. Iterate from the end to the beginning
+			// 2. Push scores to corresponding entries in avgPercents
+			// 2.1. If there are already 3 scores in entry then stop adding
+			// 3. Map scores so that each entry becomes average of scores divided by 10 (percents)
+
+			const quizResults = req.session.quizResults ?? [];
+			for(let i = quizResults.length - 1; i >= 0; i--) {
+				if(!avgPercents[quizResults[i].fireTruckID]) {
+					avgPercents[quizResults[i].fireTruckID] = [];
+				}
+
+				if(avgPercents[quizResults[i].fireTruckID].length < 3) {
+					avgPercents[quizResults[i].fireTruckID].push(quizResults[i].points);
+				}
+			}
+
+			console.log(avgPercents);
+
+			Object.keys(avgPercents).forEach(function(fireTruckID, index) {
+				let sum = 0;
+				let numberOfResults = 0;
+
+				avgPercents[fireTruckID].forEach(points => {
+					sum += +points;
+					numberOfResults++;
+					console.log(sum, numberOfResults);
+				});
+
+				let averagePercent = (sum/numberOfResults)/10;
+				avgPercents[fireTruckID] = averagePercent;
+			});
+
+			// It is pretty complicated so it may be reasonable to change it in the future
+
+			trucksList.map(row => {
+				const truckID = row['ID'];
+
+				row.avgPercent = avgPercents[truckID] ?? 0;
+			});
+
+			res.status(200);
+			res.json(trucksList);
+		} catch(error) {
+			console.log(error);
+			res.status(500);
+			res.json({
+				queryErrors: {},
+				otherErrors: ['Wystąpił błąd serwera!']
+			});
+		}
+	}
+});
+
+app.get('/quiz-pages', async (req, res) => {
+	const fireTruck = req.query['fire-truck'];
+
+	if(!fireTruck) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Nie podano parametru!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(!validator.isNumeric(fireTruck, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Podane ID musi być liczbą (całkowitą)!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(fireTruck <= 0) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Podane ID musi być większe od 0!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	try {
+		const truckExists = (await db.any('SELECT id FROM fire_truck WHERE id = $1', [fireTruck])).length != 0;
+		if(!truckExists) {
+			res.status(404);
+			res.json({
+				queryErrors: {
+					'fire-truck': ['Wóz o podanym ID nie istnieje!']
+				},
+				otherErrors: []
+			});
+			return;
+		}
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+		return;
+	}
+
+	try {
+		let quizData = await db.any(
+			'SELECT side_id AS "sideID", side_image_path AS "sideImagePath", \
+				cache_id AS "cacheID", cache_rectangle as "cacheRectangle", cache_name as "cacheName" FROM get_quiz_data_for_truck($1)', [fireTruck]);
+
+		quizData = quizData.reduce((acc, curr) => {
+			const sideID = curr.sideID;
+
+			if(!acc[sideID]) {
+				acc[sideID] = {
+					sideImagePath: curr.sideImagePath,
+					caches: []
+				};
+			}
+
+			delete curr.sideID;
+
+			acc[sideID].caches.push({
+				cacheID: curr.cacheID,
+				cacheName: curr.cacheName,
+				cacheRectangle: curr.cacheRectangle
+			});
+
+			return acc;
+		}, {});
+
+		res.status(200);
+		res.send(quizData);
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+	}
+});
+
+app.get('/random-question', async (req, res) => {
+	const fireTruck = req.query['fire-truck'];
+
+	if(!fireTruck) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Nie podano parametru!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(!validator.isNumeric(fireTruck, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Podane ID musi być liczbą (całkowitą)!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(fireTruck <= 0) {
+		res.status(400);
+		res.json({
+			queryErrors: {
+				'fire-truck': ['Podane ID musi być większe od 0!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	try {
+		const truckExists = (await db.any('SELECT id FROM fire_truck WHERE id = $1', [fireTruck])).length != 0;
+		if(!truckExists) {
+			res.status(404);
+			res.json({
+				queryErrors: {
+					'fire-truck': ['Wóz o podanym ID nie istnieje!']
+				},
+				otherErrors: []
+			});
+			return;
+		}
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+		return;
+	}
+
+	try {
+		const randomQuestion = await db.one('SELECT cache_id AS "cacheID", equipment_name AS "equipmentName" FROM get_random_question($1)', [fireTruck]);
+		res.status(200);
+		res.send(randomQuestion);
+	} catch(error) {
+		res.status(500);
+		res.json({
+			queryErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+	}
+});
+
+app.post('/quiz-results', async (req, res) => {
+	const fireTruck = req.body.fireTruck.toString();
+	const seconds = req.body.seconds.toString();
+	const points = req.body.points.toString();
+
+	if(!validator.isNumeric(fireTruck, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'fire-truck': ['Podane ID musi być liczbą (całkowitą)!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(fireTruck <= 0) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'fire-truck': ['Podane ID musi być większe od 0!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	try {
+		const truckExists = (await db.any('SELECT id FROM fire_truck WHERE id = $1', [fireTruck])).length != 0;
+		if(!truckExists) {
+			res.status(404);
+			res.json({
+				fieldErrors: {
+					'fire-truck': ['Wóz o podanym ID nie istnieje!']
+				},
+				otherErrors: []
+			});
+			return;
+		}
+	} catch(error) {
+		res.status(500);
+		res.json({
+			fieldErrors: {},
+			otherErrors: ['Wystąpił błąd serwera!']
+		});
+		return;
+	}
+
+	/* Walidacje dla seconds */
+
+	if(!validator.isNumeric(seconds, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'seconds': ['Sekundy muszą być liczbą całkowitą!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(seconds <= 0) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'seconds': ['Sekundy muszą być większe od 0!']
+			},
+			otherErrors: []
+		});
+		return;
+	}	
+
+	/* Walidacje dla points */
+
+	if(!validator.isNumeric(seconds, { no_symbols: true })) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'points': ['Punkty muszą być liczbą całkowitą!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	if(points <= 0 || points >= 10) {
+		res.status(400);
+		res.json({
+			fieldErrors: {
+				'points': ['Punkty muszą być w przedziale 0-10!']
+			},
+			otherErrors: []
+		});
+		return;
+	}
+
+	// TODO: Zapis do sesji lub do bazy
+	console.log('Zapis', req.body);
+
+	
+	if(!req.session.accountNickname) {
+		// Zapis do sesji
+		if(!req.session.quizResults) {
+			req.session.quizResults = [];
+		}
+
+		req.session.quizResults.push({ fireTruckID: fireTruck, seconds, points });
+	} else {
+		// Zapis na konto
+		try {
+			await db.none('INSERT INTO score (account_nickname, fire_truck_id, points, seconds)\
+					VALUES ($1, $2, $3, $4)', [req.session.accountNickname, fireTruck, points, seconds]);
+		} catch(error) {
+			console.error(error);
+			res.status(500);
+			res.json({
+				fieldErrors: {},
+				otherErrors: ['Wystąpił błąd serwera!']
+			});
+			return;
+		}
+	}
+
+	res.sendStatus(204);
+});
+
+// TESTY CIASTECZEK:
+/* app.get('/cookieaddone', (req, res) => {
+	req.session.counter = (req.session.counter || 0) + 1
+	res.status(200);
+	res.send('Added!');
+});
+
+app.get('/cookiegetvalue', (req, res) => {
+	const val = req.session.counter || 0;
+	res.status(200);
+	res.send(`Value: ${val}`);
+}); */
+
+// TODO: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+// CAUTION: Only for testing purposes! Should be deleted ASAP when not needed anymore.
+app.get('/simulate-login', (req, res) => {
+	const nickToAuth = req.query.nickname;
+
+	if(!nickToAuth) {
+		res.status(400);
+		res.send('You must pass nickname as query parameter to simulate login');
+		return;
+	}
+
+	req.session.accountNickname = nickToAuth;
+	res.status(200);
+	res.send(`Logged in as ${nickToAuth}`);
+});
+
+app.get('/simulate-logout', (req, res) => {
+	if(!req.session.accountNickname) {
+		res.status(401);
+		res.json({
+			fieldErrors: {},
+			otherErrors: [
+				'Użytkownik nie jest zalogowany!'
+			]
+		});
+		return;
+	}
+
+	req.session.destroy();
+	res.status(200);
+	res.send(`Logged out!`);
+});
+
+app.listen(port, () => {
+	console.log(`Skrytka.app słucha na porcie ${port}...`);
+});
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..596ade8
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,882 @@
+{
+  "name": "skrytka",
+  "version": "0.0.1",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "skrytka",
+      "version": "0.0.1",
+      "license": "ISC",
+      "dependencies": {
+        "connect-pg-simple": "^8.0.0",
+        "express": "^4.18.2",
+        "express-session": "^1.17.3",
+        "pg": "^8.9.0",
+        "pg-promise": "^11.2.0",
+        "response-time": "^2.3.2",
+        "validator": "^13.9.0"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "18.13.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.13.0.tgz",
+      "integrity": "sha512-gC3TazRzGoOnoKAhUx+Q0t8S9Tzs74z7m0ipwGpSqQrleP14hKxP4/JUeEQcD3W1/aIpnWl8pHowI7WokuZpXg=="
+    },
+    "node_modules/@types/pg": {
+      "version": "8.6.6",
+      "resolved": "https://registry.npmjs.org/@types/pg/-/pg-8.6.6.tgz",
+      "integrity": "sha512-O2xNmXebtwVekJDD+02udOncjVcMZQuTEQEMpKJ0ZRf5E7/9JJX3izhKUcUifBkyKpljyUM6BTgy2trmviKlpw==",
+      "dependencies": {
+        "@types/node": "*",
+        "pg-protocol": "*",
+        "pg-types": "^2.2.0"
+      }
+    },
+    "node_modules/accepts": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
+      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg=="
+    },
+    "node_modules/assert-options": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/assert-options/-/assert-options-0.8.0.tgz",
+      "integrity": "sha512-qSELrEaEz4sGwTs4Qh+swQkjiHAysC4rot21+jzXU86dJzNG+FDqBzyS3ohSoTRf4ZLA3FSwxQdiuNl5NXUtvA==",
+      "engines": {
+        "node": ">=10.0.0"
+      }
+    },
+    "node_modules/body-parser": {
+      "version": "1.20.1",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.1.tgz",
+      "integrity": "sha512-jWi7abTbYwajOytWCQc37VulmWiRae5RyTpaCyDcS5/lMdtwSz5lOpDE67srw/HYe35f1z3fDQw+3txg7gNtWw==",
+      "dependencies": {
+        "bytes": "3.1.2",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "2.0.0",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.11.0",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..6474fd7
--- /dev/null
+++ b/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "skrytka",
+  "version": "0.0.1",
+  "description": "Potężna aplikacja Skrytka.App!",
+  "main": "app.js",
+  "scripts": {
+    "start": "node app.js"
+  },
+  "author": "Zespół Skrytka.App",
+  "license": "ISC",
+  "dependencies": {
+    "connect-pg-simple": "^8.0.0",
+    "express": "^4.18.2",
+    "express-session": "^1.17.3",
+    "pg": "^8.9.0",
+    "pg-promise": "^11.2.0",
+    "response-time": "^2.3.2",
+    "validator": "^13.9.0"
+  }
+}