diff --git a/knexfile.js b/knexfile.js
new file mode 100644
index 0000000..5d49f78
--- /dev/null
+++ b/knexfile.js
@@ -0,0 +1,17 @@
+require('dotenv').config();
+
+module.exports = {
+	client: 'postgresql',
+	connection: {
+		database: `${process.env.DB_NAME}` ,
+		user:     `${process.env.DB_USER}`,
+		password: `${process.env.DB_PASS}`
+	},
+	pool: {
+		min: 2,
+		max: 10
+	},
+	migrations: {
+		tableName: 'knex_migrations'
+	}
+};
diff --git a/migrations/20230318002626_initial.js b/migrations/20230318002626_initial.js
new file mode 100644
index 0000000..7f249de
--- /dev/null
+++ b/migrations/20230318002626_initial.js
@@ -0,0 +1,259 @@
+/**
+ * @param { import("knex").Knex } knex
+ * @returns { Promise<void> }
+ */
+exports.up = function(knex) {
+	return knex.schema.createTable('osp_unit', function (table) {
+		table.increments();
+		table.string('name')
+			.notNullable();
+		table.string('locality')
+			.notNullable()
+			.checkRegex('[A-ZĄĆĘŁŃÓŚŹŻ][A-zĄĆĘŁŃÓŚŹŻząćęłńóśźż. ]+');
+	}).createTable('fire_truck', function (table) {
+		table.increments();
+		table.string('name')
+			.notNullable();
+		table.string('image_path')
+			.notNullable()
+			.checkRegex('^([0-9a-z_]+/?)*[0-9a-z_]+\.((png)|(jpg)|(jpeg)|(webp))$');
+		table.integer('osp_unit_id')
+			.unsigned()
+			.notNullable()
+			.references('id').inTable('osp_unit')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+	}).createTable('truck_side', function (table) {
+		table.increments();
+		table.string('image_path')
+			.notNullable()
+			.checkRegex('^([0-9a-z_]+/?)*[0-9a-z_]+\.((png)|(jpg)|(jpeg)|(webp))$');
+		table.integer('ordinal_number')
+			.notNullable();
+		table.integer('fire_truck_id')
+			.unsigned()
+			.notNullable()
+			.references('id').inTable('fire_truck')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+	}).createTable('cache', function (table) {
+		table.increments();
+		table.string('name')
+			.notNullable();
+		// I think it may be reasonable to eliminate using Box type as it is not well supported by JS tools
+		table.specificType('rectangle', 'box')
+			.notNullable();
+		table.integer('truck_side_id')
+			.unsigned()
+			.notNullable()
+			.references('id').inTable('truck_side')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.check('(rectangle[0])[0] <= 1 AND (rectangle[0])[0] >= 0 AND (rectangle[0])[1] <= 1 AND (rectangle[0])[1] >= 0 AND (rectangle[1])[0] <= 1 AND (rectangle[1])[0] >= 0 AND (rectangle[1])[1] <= 1 AND (rectangle[1])[1] >= 0');
+	}).createTable('equipment', function (table) {
+		table.increments();
+		table.string('name')
+			.notNullable();
+		table.integer('cache_id')
+			.notNullable()
+			.references('id')
+			.inTable('cache');
+	}).createTable('account', function (table) {
+		table.string('nickname')
+			.primary()
+			.checkRegex('^[0-9A-z_żółćęśąźńŻÓŁĆĘŚĄŹŃ]{3,}$');
+		table.string('name')
+			.checkRegex('^[A-ZŻÓŁĆĘŚĄŹŃ][a-zżółćęśąźń]+$');
+		table.string('surname')
+			.checkRegex('^[A-ZŻÓŁĆĘŚĄŹŃ][a-zżółćęśąźń]+$');
+		// TODO: Does it need any constraint?
+		table.string('pass_hash')
+			.notNullable();
+		table.integer('default_osp')
+			.unsigned()
+			.references('id').inTable('osp_unit')
+			.onUpdate('CASCADE')
+			.onDelete('SET NULL');
+	}).createTable('permission', function (table) {
+		table.string('code')
+			.primary()
+			.checkRegex('^[0-9A-Z_]{3,}$');
+		table.string('name')
+			.checkLength('>=', 3);
+		table.string('description');
+	}).createTable('score', function (table) {
+		table.increments();
+		table.string('account_nickname')
+			.notNullable()
+			.references('nickname')
+			.inTable('account')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.timestamp('got_at')
+			.notNullable()
+			.defaultTo(knex.fn.now());
+		table.integer('fire_truck_id')
+			.unsigned()
+			.notNullable()
+			.references('id').inTable('fire_truck')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.integer('points')
+			.notNullable()
+			.checkBetween([0, 10]);
+		table.integer('seconds')
+			.notNullable()
+			.checkPositive();
+	}).createTable('account_permission', function (table) {
+		table.string('account_nickname')
+			.notNullable()
+			.references('nickname')
+			.inTable('account')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.string('permission_code')
+			.notNullable()
+			.references('code')
+			.inTable('permission')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.integer('osp_unit_id')
+			.notNullable()
+			.references('id')
+			.inTable('osp_unit')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.primary(
+			['account_nickname',
+			'permission_code',
+			'osp_unit_id']
+		);
+	}).createTable('event', function (table) {
+		table.increments();
+		table.string('name')
+			.notNullable()
+			.checkLength('>=', 3);
+		table.string('details');
+		table.timestamp('report_time')
+			.notNullable();
+		table.string('account_nickname')
+			.notNullable()
+			.references('nickname')
+			.inTable('account')
+			.onUpdate('CASCADE')
+			.onDelete('SET NULL');
+		table.integer('osp_unit_id')
+			.notNullable()
+			.references('id')
+			.inTable('osp_unit')
+			.onUpdate('CASCADE')
+			.onDelete('CASCADE');
+		table.check('report_time <= now() AND date_part(\'hour\', CURRENT_TIMESTAMP - report_time) < 1');
+	}).raw(
+		`
+		CREATE FUNCTION get_units_list(prefix VARCHAR)
+		RETURNS TABLE (id INTEGER, name VARCHAR, locality VARCHAR) AS
+		$func$
+		    SELECT id, name, locality FROM osp_unit
+		    WHERE LOWER(locality) LIKE LOWER('%' || prefix || '%')
+		       OR LOWER(name) LIKE LOWER('%' || prefix || '%')
+		    ORDER BY locality, name LIMIT 3;
+		$func$
+		LANGUAGE SQL;
+		`
+	).raw(
+		`
+		CREATE FUNCTION get_trucks_list_with_scores(osp_unit INTEGER, nickname VARCHAR, last_scores_num INTEGER = 3)
+    		RETURNS TABLE (id INTEGER, name VARCHAR, image_path VARCHAR, avg_percent FLOAT) AS
+		$func$
+	    	SELECT ft.id, name, image_path, ROUND(AVG(s.points) * 10, 2) AS avg_percent
+		FROM fire_truck ft
+		JOIN score s ON ft.id = s.fire_truck_id AND s.account_nickname = nickname
+		WHERE ft.osp_unit_id = osp_unit AND s.id IN (
+			SELECT sc.id FROM score sc
+			WHERE sc.account_nickname = nickname AND sc.fire_truck_id = ft.id
+			ORDER BY sc.got_at DESC
+			LIMIT last_scores_num
+		) GROUP BY ft.id, name, image_path
+		UNION
+		(SELECT ft.id, name, image_path, 0
+			FROM fire_truck ft
+			WHERE ft.osp_unit_id = osp_unit AND
+				ft.id NOT IN (SELECT fire_truck_id FROM score WHERE account_nickname = nickname))
+		ORDER BY 1;
+		$func$
+	LANGUAGE SQL;
+		`
+	).raw(
+		`
+		CREATE FUNCTION get_quiz_data_for_truck(truck_id INTEGER)
+		    RETURNS TABLE (side_id INTEGER, side_image_path VARCHAR, cache_id INTEGER,
+			cache_rectangle BOX, cache_name VARCHAR) AS
+		$func$
+		    SELECT ts.id, ts.image_path, c.id, c.rectangle, c.name
+		    FROM fire_truck
+			JOIN truck_side ts on fire_truck.id = ts.fire_truck_id
+			JOIN cache c on ts.id = c.truck_side_id
+		    WHERE fire_truck.id = truck_id
+		    ORDER BY ts.ordinal_number;
+		$func$
+		LANGUAGE SQL;
+		`
+	).raw(
+		`
+		CREATE FUNCTION get_random_question(truck_id INTEGER)
+		    RETURNS TABLE (cache_id INTEGER, equipment_name VARCHAR) AS
+		$func$
+		    SELECT c.id, e.name
+		    FROM truck_side ts
+		    JOIN cache c on ts.id = c.truck_side_id
+		    JOIN equipment e on c.id = e.cache_id
+		    WHERE ts.fire_truck_id = truck_id
+		    ORDER BY RANDOM()
+		    LIMIT 1;
+		$func$
+		LANGUAGE SQL;
+		`
+	).raw(
+		`
+		CREATE TABLE user_session (
+		  "sid" varchar NOT NULL COLLATE "default",
+		  "sess" json NOT NULL,
+		  "expire" timestamp(6) NOT NULL
+		)
+		WITH (OIDS=FALSE);
+
+		ALTER TABLE user_session ADD CONSTRAINT "session_pkey" PRIMARY KEY ("sid") NOT DEFERRABLE INITIALLY IMMEDIATE;
+
+		CREATE INDEX "IDX_session_expire" ON user_session ("expire");
+		`
+	);
+};
+
+/**
+ * @param { import("knex").Knex } knex
+ * @returns { Promise<void> }
+ */
+exports.down = function(knex) {
+ 	return new Promise(async (resolve, reject) => {
+		await knex.schema
+			.dropTableIfExists('event')
+			.dropTableIfExists('account_permission')
+			.dropTableIfExists('permission')
+			.dropTableIfExists('score')
+			.dropTableIfExists('account')
+			.dropTableIfExists('equipment')
+			.dropTableIfExists('cache')
+			.dropTableIfExists('truck_side')
+			.dropTableIfExists('fire_truck')
+			.dropTableIfExists('osp_unit')
+			.dropTableIfExists('user_session');
+
+		await knex.raw('DROP FUNCTION IF EXISTS get_units_list');
+		await knex.raw('DROP FUNCTION IF EXISTS get_trucks_list_with_scores');
+		await knex.raw('DROP FUNCTION IF EXISTS get_quiz_data_for_truck');
+		await knex.raw('DROP FUNCTION IF EXISTS get_random_question'); 
+
+		resolve();
+	});
+}
diff --git a/package-lock.json b/package-lock.json
index d368fd8..1f8fd9c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "dotenv": "^16.0.3",
         "express": "^4.18.2",
         "express-session": "^1.17.3",
+        "knex": "^2.4.2",
         "pg": "^8.9.0",
         "pg-promise": "^11.2.0",
         "response-time": "^2.3.2",
@@ -110,6 +111,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/colorette": {
+      "version": "2.0.19",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-2.0.19.tgz",
+      "integrity": "sha512-3tlv/dIP7FWvj3BsbHrGLJ6l/oKh1O3TcgBqMn+yyCagOxc23fyzDS6HypQbgxWbkpDnf52p1LuR4eWDQ/K9WQ=="
+    },
+    "node_modules/commander": {
+      "version": "9.5.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-9.5.0.tgz",
+      "integrity": "sha512-KRs7WVDKg86PWiuAqhDrAQnTXZKraVcCc6vFdL14qrZ/DcWwuRo7VoiYXalXO7S5GKpqYiVEwCbgFDfxNHKJBQ==",
+      "engines": {
+        "node": "^12.20.0 || >=14"
+      }
+    },
     "node_modules/connect-pg-simple": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/connect-pg-simple/-/connect-pg-simple-8.0.0.tgz",
@@ -200,11 +214,27 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/escalade": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.1.1.tgz",
+      "integrity": "sha512-k0er2gUkLf8O0zKJiAhmkTnJlTvINGv7ygDNPbeIsX/TJjGJZHuh9B2UxbsaEkmlEo9MfhrSzmhIlhRlI2GXnw==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/escape-html": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
       "integrity": "sha512-NiSupZ4OeuGwr68lGIeym/ksIZMJodUGOSCZ/FSnTxcrekbvqrgdUxlJOMpijaKZVjAJrWrGs/6Jy8OMuyj9ow=="
     },
+    "node_modules/esm": {
+      "version": "3.2.25",
+      "resolved": "https://registry.npmjs.org/esm/-/esm-3.2.25.tgz",
+      "integrity": "sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/etag": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
@@ -331,6 +361,19 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/get-package-type": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/get-package-type/-/get-package-type-0.1.0.tgz",
+      "integrity": "sha512-pjzuKtY64GYfWizNAJ0fr9VqttZkNiK2iS430LtIHzjBEr6bX8Am2zm4sW4Ro5wjWW5cAlRL1qAMTcXbjNAO2Q==",
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
+    "node_modules/getopts": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/getopts/-/getopts-2.3.0.tgz",
+      "integrity": "sha512-5eDf9fuSXwxBL6q5HX+dhDj+dslFGWzU5thZ9kNKUkcPtaPdatmUFKwHFrLb/uf/WpA4BHET+AX3Scl56cAjpA=="
+    },
     "node_modules/has": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
@@ -384,6 +427,14 @@
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ=="
     },
+    "node_modules/interpret": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/interpret/-/interpret-2.2.0.tgz",
+      "integrity": "sha512-Ju0Bz/cEia55xDwUWEa8+olFpCiQoypjnQySseKtmjNrnps3P+xfpUmGr90T7yjlVJmOtybRvPXhKMbHr+fWnw==",
+      "engines": {
+        "node": ">= 0.10"
+      }
+    },
     "node_modules/ipaddr.js": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
@@ -392,6 +443,93 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/is-core-module": {
+      "version": "2.11.0",
+      "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.11.0.tgz",
+      "integrity": "sha512-RRjxlvLDkD1YJwDbroBHMb+cukurkDWNyHx7D3oNB5x9rb5ogcksMC5wHCadcXoo67gVr/+3GFySh3134zi6rw==",
+      "dependencies": {
+        "has": "^1.0.3"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/knex": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/knex/-/knex-2.4.2.tgz",
+      "integrity": "sha512-tMI1M7a+xwHhPxjbl/H9K1kHX+VncEYcvCx5K00M16bWvpYPKAZd6QrCu68PtHAdIZNQPWZn0GVhqVBEthGWCg==",
+      "dependencies": {
+        "colorette": "2.0.19",
+        "commander": "^9.1.0",
+        "debug": "4.3.4",
+        "escalade": "^3.1.1",
+        "esm": "^3.2.25",
+        "get-package-type": "^0.1.0",
+        "getopts": "2.3.0",
+        "interpret": "^2.2.0",
+        "lodash": "^4.17.21",
+        "pg-connection-string": "2.5.0",
+        "rechoir": "^0.8.0",
+        "resolve-from": "^5.0.0",
+        "tarn": "^3.0.2",
+        "tildify": "2.0.0"
+      },
+      "bin": {
+        "knex": "bin/cli.js"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "peerDependenciesMeta": {
+        "better-sqlite3": {
+          "optional": true
+        },
+        "mysql": {
+          "optional": true
+        },
+        "mysql2": {
+          "optional": true
+        },
+        "pg": {
+          "optional": true
+        },
+        "pg-native": {
+          "optional": true
+        },
+        "sqlite3": {
+          "optional": true
+        },
+        "tedious": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/knex/node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/knex/node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+    },
+    "node_modules/lodash": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
+    },
     "node_modules/media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -496,6 +634,11 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/path-parse": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
+      "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw=="
+    },
     "node_modules/path-to-regexp": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
@@ -688,6 +831,41 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/rechoir": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.8.0.tgz",
+      "integrity": "sha512-/vxpCXddiX8NGfGO/mTafwjq4aFa/71pvamip0++IQk3zG8cbCj0fifNPrjjF1XMXUne91jL9OoxmdykoEtifQ==",
+      "dependencies": {
+        "resolve": "^1.20.0"
+      },
+      "engines": {
+        "node": ">= 10.13.0"
+      }
+    },
+    "node_modules/resolve": {
+      "version": "1.22.1",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.1.tgz",
+      "integrity": "sha512-nBpuuYuY5jFsli/JIs1oldw6fOQCBioohqWZg/2hiaOybXOft4lonv85uDOKXdf8rhyK159cxU5cDcK/NKk8zw==",
+      "dependencies": {
+        "is-core-module": "^2.9.0",
+        "path-parse": "^1.0.7",
+        "supports-preserve-symlinks-flag": "^1.0.0"
+      },
+      "bin": {
+        "resolve": "bin/resolve"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/resolve-from": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+      "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/response-time": {
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/response-time/-/response-time-2.3.2.tgz",
@@ -816,6 +994,33 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/supports-preserve-symlinks-flag": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
+      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/tarn": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/tarn/-/tarn-3.0.2.tgz",
+      "integrity": "sha512-51LAVKUSZSVfI05vjPESNc5vwqqZpbXCsU+/+wxlOrUjk2SnFTt97v9ZgQrD4YmxYW1Px6w2KjaDitCfkvgxMQ==",
+      "engines": {
+        "node": ">=8.0.0"
+      }
+    },
+    "node_modules/tildify": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/tildify/-/tildify-2.0.0.tgz",
+      "integrity": "sha512-Cc+OraorugtXNfs50hU9KS369rFXCfgGLpfCfvlc+Ud5u6VWmUQsOAa9HbTvheQdYnrdJqqv1e5oIqXppMYnSw==",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/toidentifier": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
diff --git a/package.json b/package.json
index 2a3b7f8..c66fbd5 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,7 @@
     "dotenv": "^16.0.3",
     "express": "^4.18.2",
     "express-session": "^1.17.3",
+    "knex": "^2.4.2",
     "pg": "^8.9.0",
     "pg-promise": "^11.2.0",
     "response-time": "^2.3.2",
diff --git a/skrytka_create_db.sql b/skrytka_create_db.sql
deleted file mode 100644
index 6c5c0c9..0000000
--- a/skrytka_create_db.sql
+++ /dev/null
@@ -1,104 +0,0 @@
-SET client_encoding TO 'UTF8';
-
-DROP TABLE IF EXISTS osp_unit CASCADE;
-DROP TABLE IF EXISTS fire_truck CASCADE;
-DROP TABLE IF EXISTS truck_side CASCADE;
-DROP TABLE IF EXISTS cache CASCADE;
-DROP TABLE IF EXISTS account CASCADE;
-DROP TABLE IF EXISTS equipment CASCADE;
-DROP TABLE IF EXISTS score CASCADE;
-DROP TABLE IF EXISTS permission CASCADE;
-DROP TABLE IF EXISTS accounts_permissions CASCADE;
-DROP TABLE IF EXISTS event CASCADE;
-DROP TABLE IF EXISTS user_session;
-
-CREATE TABLE osp_unit (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(128) NOT NULL,
-    locality VARCHAR(64) NOT NULL CHECK(locality SIMILAR TO '[A-ZĄĆĘŁŃÓŚŹŻ][A-zĄĆĘŁŃÓŚŹŻząćęłńóśźż. ]+')
-);
-
-CREATE TABLE fire_truck (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(64) NOT NULL,
-    image_path VARCHAR(128) CHECK(image_path ~ '^([0-9A-Za-z_]+/?)*[0-9A-Za-z_]+\.((png)|(jpg)|(jpeg)|(webp))$'),
-    osp_unit_id INTEGER NOT NULL REFERENCES osp_unit ON DELETE CASCADE ON UPDATE CASCADE
-);
-
-CREATE TABLE truck_side (
-    id SERIAL PRIMARY KEY,
-    image_path VARCHAR(128) NOT NULL CHECK(image_path ~ '^([0-9A-Za-z_]+/?)*[0-9A-Za-z_]+\.((png)|(jpg)|(jpeg)|(webp))$'),
-    ordinal_number INTEGER NOT NULL,
-    fire_truck_id INTEGER REFERENCES fire_truck ON DELETE CASCADE ON UPDATE CASCADE
-);
-
-CREATE TABLE cache (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(64),
-    rectangle BOX NOT NULL CHECK(
-        (rectangle[0])[0] <= 1 AND (rectangle[0])[0] >= 0 AND
-        (rectangle[0])[1] <= 1 AND (rectangle[0])[1] >= 0 AND
-        (rectangle[1])[0] <= 1 AND (rectangle[1])[0] >= 0 AND
-        (rectangle[1])[1] <= 1 AND (rectangle[1])[1] >= 0
-    ),
-    truck_side INTEGER NOT NULL REFERENCES truck_side ON DELETE CASCADE ON UPDATE CASCADE
-);
-
-CREATE TABLE account (
-    nickname VARCHAR(32) CHECK(nickname SIMILAR TO '[0-9A-z_żółćęśąźńŻÓŁĆĘŚĄŹŃ]{3,}') PRIMARY KEY,
-    name VARCHAR(32) CHECK(name SIMILAR TO '[A-ZŻÓŁĆĘŚĄŹŃ][a-zżółćęśąźń]+'),
-    surname VARCHAR(64) CHECK(surname SIMILAR TO '[A-ZŻÓŁĆĘŚĄŹŃ][a-zżółćęśąźń]+'),
-    pass_hash CHAR(72) NOT NULL, -- Tu należy dostosować odpowiednio dla wybranego sposobu hashowania
-    default_osp INTEGER REFERENCES osp_unit ON DELETE SET NULL ON UPDATE CASCADE
-);
-
-CREATE TABLE equipment (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(64) NOT NULL CHECK(LENGTH(name) > 0),
-    cache_id INTEGER NOT NULL REFERENCES cache ON DELETE CASCADE ON UPDATE CASCADE
-);
-
-CREATE TABLE score (
-    id SERIAL PRIMARY KEY,
-    account_nickname VARCHAR(32) REFERENCES account ON DELETE CASCADE ON UPDATE CASCADE,
-    acquisition_timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
-    fire_truck_id INTEGER NOT NULL REFERENCES fire_truck ON DELETE CASCADE ON UPDATE CASCADE,
-    points INTEGER NOT NULL CHECK(points BETWEEN 0 AND 10),
-    seconds INTEGER NOT NULL CHECK(seconds > 0)
-);
-
-CREATE TABLE permission (
-    code VARCHAR(64) CHECK(code ~ '^[0-9A-Z_]{3,}$') PRIMARY KEY,
-    name VARCHAR(64) CHECK(LENGTH(name) >= 3),
-    description VARCHAR(128)
-);
-
--- PYTANIE: Czy aktualizować permission code przy zmianie czy na NULL?
-CREATE TABLE accounts_permissions (
-    account_nickname VARCHAR(32) REFERENCES account ON DELETE CASCADE ON UPDATE CASCADE,
-    permission_code VARCHAR(64) REFERENCES permission ON DELETE CASCADE ON UPDATE CASCADE,
-    osp_unit_id INTEGER REFERENCES osp_unit ON DELETE CASCADE ON UPDATE CASCADE,
-    CONSTRAINT pk_users_permissions PRIMARY KEY (account_nickname, permission_code, osp_unit_id)
-);
-
-CREATE TABLE event (
-    id SERIAL PRIMARY KEY,
-    name VARCHAR(64) NOT NULL CHECK(LENGTH(name) >= 3),
-    details VARCHAR(128),
-    report_time TIMESTAMP WITH TIME ZONE
-        CHECK(report_time <= NOW() AND DATE_PART('hour', CURRENT_TIMESTAMP - report_time) < 1),
-    -- Chcemy zachować spójność dziennika zdarzeń, nawet jak użytkownik usunie konto:
-    account_nickname VARCHAR(32) REFERENCES account ON DELETE SET NULL ON UPDATE CASCADE,
-    osp_unit_id INTEGER REFERENCES osp_unit ON DELETE CASCADE ON UPDATE CASCADE
-);
-
-CREATE TABLE user_session (
-  "sid" varchar NOT NULL COLLATE "default",
-  "sess" json NOT NULL,
-  "expire" timestamp(6) NOT NULL
-)
-WITH (OIDS=FALSE);
-
-ALTER TABLE user_session ADD CONSTRAINT "session_pkey" PRIMARY KEY ("sid") NOT DEFERRABLE INITIALLY IMMEDIATE;
-
-CREATE INDEX "IDX_session_expire" ON user_session ("expire");
diff --git a/skrytka_create_utils.sql b/skrytka_create_utils.sql
deleted file mode 100644
index 0ee47e2..0000000
--- a/skrytka_create_utils.sql
+++ /dev/null
@@ -1,64 +0,0 @@
-DROP VIEW IF EXISTS units_list;
-CREATE VIEW units_list AS
-    SELECT id, name, locality FROM osp_unit;
- 
-DROP FUNCTION IF EXISTS get_units_list;
-CREATE FUNCTION get_units_list(prefix VARCHAR) RETURNS TABLE (id INTEGER, name VARCHAR, locality VARCHAR)
-AS
-$func$
-    SELECT * FROM units_list
-    WHERE LOWER(locality) LIKE LOWER('%' || prefix || '%')
-       OR LOWER(name) LIKE LOWER('%' || prefix || '%')
-    ORDER BY locality, name LIMIT 3;
-$func$
-LANGUAGE SQL;
-
-DROP FUNCTION IF EXISTS get_trucks_list_with_scores;
-CREATE FUNCTION get_trucks_list_with_scores(osp_unit INTEGER, nickname VARCHAR, last_scores_num INTEGER = 3)
-    RETURNS TABLE (id INTEGER, name VARCHAR, image_path VARCHAR, avg_percent FLOAT) AS
-$func$
-    SELECT ft.id, name, image_path, ROUND(AVG(s.points) * 10, 2) AS avg_percent
-    FROM fire_truck ft
-    JOIN score s ON ft.id = s.fire_truck_id AND s.account_nickname = nickname
-    WHERE ft.osp_unit_id = osp_unit AND s.id IN (
-        SELECT sc.id FROM score sc
-        WHERE sc.account_nickname = nickname AND sc.fire_truck_id = ft.id
-        ORDER BY sc.acquisition_timestamp DESC
-        LIMIT last_scores_num
-    ) GROUP BY ft.id, name, image_path
-    UNION
-    (SELECT ft.id, name, image_path, 0
-        FROM fire_truck ft
-        WHERE ft.osp_unit_id = osp_unit AND
-            ft.id NOT IN (SELECT fire_truck_id FROM score WHERE account_nickname = nickname))
-    ORDER BY 1;
-$func$
-LANGUAGE SQL;
-
-DROP FUNCTION IF EXISTS get_quiz_data_for_truck;
-CREATE FUNCTION get_quiz_data_for_truck(truck_id INTEGER)
-    RETURNS TABLE (side_id INTEGER, side_image_path VARCHAR, cache_id INTEGER,
-        cache_rectangle BOX, cache_name VARCHAR) AS
-$func$
-    SELECT ts.id, ts.image_path, c.id, c.rectangle, c.name
-    FROM fire_truck
-        JOIN truck_side ts on fire_truck.id = ts.fire_truck_id
-        JOIN cache c on ts.id = c.truck_side
-    WHERE fire_truck.id = truck_id
-    ORDER BY ts.ordinal_number;
-$func$
-LANGUAGE SQL;
-
-DROP FUNCTION IF EXISTS get_random_question;
-CREATE FUNCTION get_random_question(truck_id INTEGER)
-    RETURNS TABLE (cache_id INTEGER, equipment_name VARCHAR) AS
-$func$
-    SELECT c.id, e.name
-    FROM truck_side ts
-    JOIN cache c on ts.id = c.truck_side
-    JOIN equipment e on c.id = e.cache_id
-    WHERE ts.fire_truck_id = truck_id
-    ORDER BY RANDOM()
-    LIMIT 1;
-$func$
-LANGUAGE SQL;