diff --git a/sports_store.sql b/sports_store.sql
new file mode 100644
index 0000000..249cc17
--- /dev/null
+++ b/sports_store.sql
@@ -0,0 +1,367 @@
+CREATE TYPE person_gender AS ENUM ('M', 'F');
+
+CREATE TABLE table_persons (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    first_name TEXT NOT NULL CHECK ( first_name != '' ),
+    last_name TEXT NOT NULL CHECK ( last_name != '' ),
+    patronymic TEXT CHECK ( patronymic != '' ),
+    gender person_gender NOT NULL CHECK ( gender != '' ),
+    date_of_birth DATE,
+    is_deleted BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE table_emails (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    person_id INT NOT NULL,
+    email TEXT NOT NULL CHECK ( email LIKE '%@%' ),
+    FOREIGN KEY (person_id) REFERENCES table_persons(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_phone_numbers (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    person_id INT NOT NULL,
+    phone_number TEXT NOT NULL CHECK ( phone_number != '' ),
+    FOREIGN KEY (person_id) REFERENCES table_persons(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_manufacturers (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    name TEXT NOT NULL CHECK ( name != '' ),
+    address TEXT CHECK ( address != '' ),
+    contact_person_id INT NOT NULL,
+    description TEXT CHECK ( name != '' ),
+    FOREIGN KEY (contact_person_id) REFERENCES table_persons(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_product_types (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    name TEXT NOT NULL CHECK ( name != '' ),
+    description TEXT CHECK ( name != '' )
+);
+
+CREATE TABLE table_products (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    name TEXT NOT NULL CHECK ( name != '' ),
+    type_id INT NOT NULL,
+    amount_in_stock INT NOT NULL CHECK ( amount_in_stock >= 0 ),
+    cost_price NUMERIC NOT NULL CHECK ( cost_price >= 0.0 ),
+    manufacturer_id INT NOT NULL,
+    price NUMERIC NOT NULL CHECK ( price >= 0.0 ),
+    price_reason TEXT CHECK ( price_reason != '' ),
+    price_set_employee_id INT NOT NULL,
+    measurement_unit TEXT CHECK ( name != '' ),
+    measurement_value NUMERIC CHECK ( measurement_value >= 0.0 ),
+    is_archived BOOLEAN NOT NULL DEFAULT FALSE,
+    FOREIGN KEY (type_id) REFERENCES table_product_types(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (manufacturer_id) REFERENCES table_manufacturers(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (price_set_employee_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+-- Товар должен помещаться в архив, когда его количество становится 0
+CREATE TABLE table_archived_products_log (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    product_id INT NOT NULL,
+    change_date DATE NOT NULL,
+    FOREIGN KEY (product_id) REFERENCES table_products(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_positions (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    name TEXT NOT NULL CHECK ( name != '' ),
+    level TEXT NOT NULL CHECK ( level != '' ),
+    average_salary NUMERIC NOT NULL CHECK ( average_salary >= 0.0 ),
+    requirements TEXT NOT NULL CHECK ( requirements != '' ),
+    tasks TEXT NOT NULL CHECK ( tasks != '' ),
+    is_hiring BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE table_employees (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    person_id INT NOT NULL,
+    position_id INT NOT NULL,
+    hiring_date DATE NOT NULL,
+    salary NUMERIC NOT NULL CHECK ( salary >= 0.0 ),
+    supervisor_id INT NOT NULL,
+    position_reason TEXT CHECK ( position_reason != '' ),
+    is_deleted BOOLEAN NOT NULL DEFAULT FALSE,
+    FOREIGN KEY (person_id) REFERENCES table_persons(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (position_id) REFERENCES table_positions(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (supervisor_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_employee_history (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    employee_id INT NOT NULL,
+    supervisor_id INT NOT NULL,
+    position_id INT NOT NULL,
+    salary NUMERIC NOT NULL CHECK ( salary >= 0.0 ),
+    change_date DATE NOT NULL,
+    change_reason TEXT CHECK ( change_reason != '' ),
+    FOREIGN KEY (employee_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (supervisor_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (position_id) REFERENCES table_positions(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_price_history (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    product_id INT NOT NULL,
+    employee_id INT NOT NULL,
+    cost_price NUMERIC NOT NULL CHECK ( cost_price >= 0.0 ),
+    price NUMERIC NOT NULL CHECK ( price >= 0.0 ),
+    change_date DATE NOT NULL,
+    change_reason TEXT CHECK ( change_reason != '' ),
+    FOREIGN KEY (product_id) REFERENCES table_products(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (employee_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_clients (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    person_id INT NOT NULL,
+    discount_percent NUMERIC(3, 2) NOT NULL CHECK ( discount_percent < 1.00 AND discount_percent >= 0.00) DEFAULT 0.00,
+    is_subscribed_to_mailing_list BOOLEAN NOT NULL DEFAULT FALSE,
+    is_deleted BOOLEAN NOT NULL DEFAULT FALSE,
+    FOREIGN KEY (person_id) REFERENCES table_persons(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_orders (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    items_price NUMERIC NOT NULL CHECK ( items_price >= 0.0 ),
+    items_amount INT NOT NULL CHECK ( items_amount >= 0 ),
+    date DATE NOT NULL,
+    is_payed BOOLEAN NOT NULL DEFAULT FALSE,
+    is_client_registered BOOLEAN NOT NULL DEFAULT FALSE,
+    client_id INT,
+    FOREIGN KEY (client_id) REFERENCES table_clients(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_order_items (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    order_id INT NOT NULL,
+    product_id INT NOT NULL,
+    amount INT NOT NULL CHECK ( amount >= 0 ),
+    FOREIGN KEY (order_id) REFERENCES table_orders(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (product_id) REFERENCES table_products(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE TABLE table_sales (
+    id INT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    order_id INT NOT NULL,
+    total_price NUMERIC NOT NULL CHECK ( total_price >= 0.0 ),
+    payment_type TEXT NOT NULL CHECK ( payment_type != '' ),
+    employee_id INT NOT NULL,
+    date DATE NOT NULL,
+    FOREIGN KEY (order_id) REFERENCES table_orders(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION,
+    FOREIGN KEY (employee_id) REFERENCES table_employees(id)
+        ON DELETE NO ACTION
+        ON UPDATE NO ACTION
+);
+
+CREATE FUNCTION function_archive_product()
+    RETURNS TRIGGER AS
+$$
+BEGIN
+    IF (tg_table_name == 'table_products'
+            AND tg_op = 'UPDATE'
+            AND NEW.amount_in_stock != OLD.amount_in_stock) THEN
+        IF (NEW.amount_in_stock = 0 AND NEW.is_archived = FALSE) THEN
+            NEW.is_archived = TRUE;
+            INSERT INTO table_archived_products_log(product_id, change_date)
+            VALUES (NEW.id, CURRENT_DATE);
+        ELSIF (NEW.amount_in_stock > 0 AND NEW.is_archived = TRUE) THEN
+            NEW.is_archived = FALSE;
+        END IF;
+    ELSIF (tg_table_name = 'table_products' AND tg_op = 'INSERT') THEN
+        IF (NEW.amount_in_stock = 0 AND NEW.is_archived = FALSE) THEN
+            NEW.is_archived = TRUE;
+            INSERT INTO table_archived_products_log(product_id, change_date)
+            VALUES (NEW.id, CURRENT_DATE);
+        ELSIF (NEW.amount_in_stock > 0 AND NEW.is_archived = TRUE) THEN
+            NEW.is_archived = FALSE;
+        END IF;
+    END IF;
+    RETURN NULL;
+END;
+$$
+LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_archive_product
+    BEFORE UPDATE OR INSERT
+    ON table_products
+    FOR EACH ROW
+    EXECUTE FUNCTION function_archive_product();
+
+CREATE FUNCTION function_log_price_history()
+RETURNS TRIGGER AS
+$$
+BEGIN
+    IF (tg_table_name == 'table_products' AND tg_op = 'UPDATE') THEN
+        IF (NEW.price != OLD.price AND NEW.cost_price != OLD.cost_price) THEN
+            INSERT INTO table_price_history(product_id, employee_id,
+                                            cost_price, price,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.price_set_employee_id,
+                    NEW.cost_price, NEW.price, CURRENT_DATE,
+                    NEW.price_reason);
+        ELSIF (NEW.price != OLD.price) THEN
+            INSERT INTO table_price_history(product_id, employee_id,
+                                            cost_price, price,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.price_set_employee_id,
+                    NEW.cost_price, NEW.price, CURRENT_DATE,
+                    NEW.price_reason);
+        ELSIF (NEW.cost_price != OLD.cost_price) THEN
+            INSERT INTO table_price_history(product_id, employee_id,
+                                            cost_price, price,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.price_set_employee_id,
+                    NEW.cost_price, NEW.price, CURRENT_DATE,
+                    NEW.price_reason);
+        END IF;
+    ELSIF (tg_table_name == 'table_products' AND tg_op = 'INSERT') THEN
+        INSERT INTO table_price_history(product_id, employee_id,
+                                            cost_price, price,
+                                            change_date, change_reason)
+        VALUES (NEW.id, NEW.price_set_employee_id,
+                    NEW.cost_price, NEW.price, CURRENT_DATE,
+                    NEW.price_reason);
+    END IF;
+    RETURN NULL;
+END;
+$$
+LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_log_price_history
+    BEFORE UPDATE OR INSERT
+    ON table_products
+    FOR EACH ROW
+    EXECUTE FUNCTION function_log_price_history();
+
+CREATE FUNCTION function_log_employee_history()
+RETURNS TRIGGER AS
+$$
+BEGIN
+    IF (tg_table_name == 'table_employees' AND tg_op = 'UPDATE') THEN
+        IF (NEW.position_id != OLD.position_id AND NEW.salary != OLD.salary) THEN
+            INSERT INTO table_employee_history(employee_id, supervisor_id,
+                                            position_id, salary,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.supervisor_id,
+                    NEW.position_id, NEW.salary, CURRENT_DATE,
+                    NEW.position_reason);
+        ELSIF (NEW.position_id != OLD.position_id) THEN
+            INSERT INTO table_employee_history(employee_id, supervisor_id,
+                                            position_id, salary,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.supervisor_id,
+                    NEW.position_id, NEW.salary, CURRENT_DATE,
+                    NEW.position_reason);
+        ELSIF (NEW.salary != OLD.salary) THEN
+            INSERT INTO table_employee_history(employee_id, supervisor_id,
+                                            position_id, salary,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.supervisor_id,
+                    NEW.position_id, NEW.salary, CURRENT_DATE,
+                    NEW.position_reason);
+        END IF;
+    ELSIF (tg_table_name == 'table_employees' AND tg_op = 'INSERT') THEN
+        INSERT INTO table_employee_history(employee_id, supervisor_id,
+                                            position_id, salary,
+                                            change_date, change_reason)
+            VALUES (NEW.id, NEW.supervisor_id,
+                    NEW.position_id, NEW.salary, CURRENT_DATE,
+                    NEW.position_reason);
+    END IF;
+    RETURN NULL;
+END;
+$$
+LANGUAGE plpgsql;
+
+CREATE TRIGGER trigger_log_employee_history
+    BEFORE UPDATE OR INSERT
+    ON table_employees
+    FOR EACH ROW
+    EXECUTE FUNCTION function_log_employee_history();
+
+CREATE VIEW view_product_price_history AS
+    SELECT table_products.id AS product_id,
+           table_products.name AS name,
+           table_product_types.name AS type,
+           table_product_types.description AS description,
+           table_products.amount_in_stock AS amount_in_stock,
+           table_manufacturers.name AS manufacturer,
+           table_persons.id AS person_id,
+           table_persons.first_name AS price_change_employee_first_name,
+           table_persons.last_name AS price_change_employee_last_name,
+           table_persons.patronymic AS price_change_employee_patronymic,
+           table_price_history.cost_price AS cost_price,
+           table_price_history.price AS selling_price,
+           table_price_history.change_date AS change_date,
+           table_price_history.change_reason AS change_reason,
+           table_products.measurement_unit AS measurement_unit,
+           table_products.measurement_value AS measurement_value,
+           table_products.is_archived AS is_archived
+    FROM table_price_history
+    JOIN table_products ON table_price_history.product_id = table_products.id
+    JOIN table_product_types ON table_products.type_id = table_product_types.id
+    JOIN table_manufacturers ON table_products.manufacturer_id = table_manufacturers.id
+    JOIN table_employees ON table_price_history.employee_id = table_employees.id
+    JOIN table_persons ON table_employees.person_id = table_persons.id;
+
+CREATE VIEW view_employee_history AS
+    SELECT table_employees.id AS employee_id,
+           table_persons.id AS person_id,
+           table_persons.first_name AS first_name,
+           table_persons.last_name AS last_name,
+           table_persons.patronymic AS patronymic,
+           table_persons.gender AS gender,
+           table_persons.date_of_birth AS date_of_birth,
+           table_employee_history.supervisor_id as supervisor_id,
+           table_positions.name AS position,
+           table_employee_history.salary as salary,
+           table_employee_history.change_date as change_date,
+           table_employee_history.change_reason as change_reason
+    FROM table_employee_history
+    JOIN table_employees ON table_employee_history.employee_id = table_employees.id
+    JOIN table_persons ON table_employees.person_id = table_persons.id
+    JOIN table_positions ON table_employee_history.position_id = table_positions.id
+