diff --git a/4/data.js b/4/data.js
index 7ec4ddf..e1d06bd 100644
--- a/4/data.js
+++ b/4/data.js
@@ -150,9 +150,9 @@ const ClassTypes = ['Theory', 'Practice']
 const RegistrationStatuses = ['NotPaid', 'Paid']
 const EquipmentUsageTypes = ['PayOnce', 'PayMonthly']
 
-function Values(callback) {
+function Values(callback, factor = 1) {
   let res = 'VALUES\n'
-  const count = 5
+  const count = 5 * factor
 
   for (let i = 0; i < count; i++) {
     res += callback()
@@ -167,14 +167,21 @@ function Values(callback) {
 }
 
 
+// Person
+let script = 'INSERT INTO "Person" (full_name, passwd_hash) ' + Values(() => {
+  return `(${GenFullName()}, ${GenPasswdHash()})`
+}, 2)
+
+let person_id = 1
+
 // Master
-let script = 'INSERT INTO "Master" (full_name, passwd_hash, passport, readme) ' + Values(() => {
-  return `(${GenFullName()}, ${GenPasswdHash()}, ${GenPassport()}, 'aboba')`
+script += 'INSERT INTO "Master" ("Person_id", passport, readme) ' + Values(() => {
+  return `(${person_id++}, ${GenPassport()}, 'aboba')`
 })
 
 // Client
-script += 'INSERT INTO "Client" (full_name, passwd_hash, phone, email, billing_account) ' + Values(() => {
-  return `(${GenFullName()}, ${GenPasswdHash()}, ${GenPassport()}, ${GenPhone()}, ${GenBillingAccount()})`
+script += 'INSERT INTO "Client" ("Person_id", phone, email, billing_account) ' + Values(() => {
+  return `(${person_id++}, ${GenPhone()}, ${GenEmail()}, ${GenBillingAccount()})`
 })
 
 // Studio
@@ -183,8 +190,8 @@ script += 'INSERT INTO "Studio" (address, capacity, begin_date, duration) ' + Va
 })
 
 // Course
-script += 'INSERT INTO "Course" ("Master_id", name, price, duration) ' + Values(() => {
-  return `(${GenInt(1, 6)}, 'курс ${GenMaxUInt(100)}', ${GenPrice()}, ${GenIntervalHours(20)})`
+script += 'INSERT INTO "Course" ("Master_id", name, price, deadline_date) ' + Values(() => {
+  return `(${GenInt(1, 6)}, 'курс ${GenMaxUInt(3)}', ${GenPrice()}, ${GenTimestamp()})`
 })
 
 // Class
diff --git a/4/schema.sql b/4/schema.sql
index 88127e4..117be5a 100644
--- a/4/schema.sql
+++ b/4/schema.sql
@@ -1,39 +1,40 @@
-DROP TABLE IF EXISTS "Person" CASCADE;
-DROP SEQUENCE IF EXISTS "PersonId";
+DROP TABLE IF EXISTS "Person", "Client", "Master", "Studio", "Course", "Class", "Class_Master", "Registration", "FoodProductEnum", "FoodProduct", "Equipment", "Class_Equipment", "DrugEnum", "Drug", "DrugIntolerance", "ActivityLog";
 
-
-CREATE SEQUENCE "PersonId";
+DROP TYPE IF EXISTS "ClassType", "RegistrationStatus", "EquipmentUsageType";
 
 
 CREATE TABLE "Person" (
-  id int PRIMARY KEY DEFAULT nextval('"PersonId"'),
+  id int GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
   full_name text NOT NULL,
   passwd_hash bytea NOT NULL
 );
 
 
 CREATE TABLE "Client" (
+  "Person_id" int UNIQUE NOT NULL,
+
   phone text NOT NULL,
   email text NOT NULL,
   billing_account text NOT NULL,
-
-  PRIMARY KEY (id)
-) INHERITS ("Person");
+  
+  FOREIGN KEY ("Person_id") REFERENCES "Person" (id)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE
+);
 
 
 CREATE TABLE "Master" (
+  "Person_id" int UNIQUE NOT NULL,
+
   passport text UNIQUE NOT NULL,
   readme text NOT NULL,
 
-  PRIMARY KEY (id)
-) INHERITS ("Person");
+  FOREIGN KEY ("Person_id") REFERENCES "Person" (id)
+    ON DELETE CASCADE
+    ON UPDATE CASCADE
+);
 
 
-DROP TABLE IF EXISTS "Studio", "Course", "Class", "Class_Master", "Registration", "FoodProductEnum", "FoodProduct", "Equipment", "Class_Equipment", "DrugEnum", "Drug", "DrugIntolerance", "ActivityLog";
-
-
-DROP TYPE IF EXISTS "ClassType", "RegistrationStatus", "EquipmentUsageType";
-
 CREATE TABLE "Studio" (
   id int GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
   address text UNIQUE NOT NULL,
@@ -48,9 +49,9 @@ CREATE TABLE "Course" (
   "Master_id" int,
   name text NOT NULL,
   price real NOT NULL CHECK (price > 0),
-  duration interval NOT NULL,
+  deadline_date timestamptz NOT NULL,
 
-  FOREIGN KEY ("Master_id") REFERENCES "Master" (id)
+  FOREIGN KEY ("Master_id") REFERENCES "Master" ("Person_id")
     ON DELETE SET NULL
     ON UPDATE CASCADE
 );
@@ -89,7 +90,7 @@ CREATE TABLE "Class_Master" (
 
   PRIMARY KEY ("Class_begin_date", "Class_Course_id", "Master_id"),
 
-  FOREIGN KEY ("Master_id") REFERENCES "Master" (id)
+  FOREIGN KEY ("Master_id") REFERENCES "Master" ("Person_id")
     ON DELETE CASCADE
     ON UPDATE CASCADE,
   
@@ -113,7 +114,7 @@ CREATE TABLE "Registration" (
 
   PRIMARY KEY ("Client_id", "Course_id"),
 
-  FOREIGN KEY ("Client_id") REFERENCES "Client" (id)
+  FOREIGN KEY ("Client_id") REFERENCES "Client" ("Person_id")
     ON DELETE CASCADE
     ON UPDATE CASCADE,
   
diff --git a/регламент.md b/регламент.md
index c121aab..84afabb 100644
--- a/регламент.md
+++ b/регламент.md
@@ -37,36 +37,6 @@
   * **Текстовое описание работы не подразумевается, только фиксация результата**  
 * устная защита на лабораторной работе.
 
-## Лабораторная работа 5
-
-**Аналитические SQL-запросы**
-
-**Срок выполнения: 2 недели**
-
-### **Цель**
-
-Освоить сложные запросы и аналитические возможности SQL.
-
-### **Обязательные требования к запросам**
-
-Все запросы должны:
-
-* использовать CTE;  
-* возвращать расширенный набор данных (не менее 7 строк вывода).
-
-### **Необходимо реализовать 5 запросов, среди которые должны использоваться:**
-
-1. Сложный JOIN (3+ таблиц) с фильтрами и HAVING.  
-2. Поиск отсутствующих данных (LEFT JOIN \+ IS NULL).  
-3. Оконная функция с `ROWS BETWEEN`.  
-4. Оконная функция смещения (`LAG` / `LEAD`).
-
-### **Отчетные материалы**
-
-* SQL-код запросов;  
-* примеры выполнения;  
-  краткое описание логики каждого запроса.
-
 ## Лабораторная работа 6
 
 **Триггеры и хранимые процедуры**