добавил денение на подгруппы для лабораторных работ

backend/src/main/resources/db/migration/V1__init.sql

@@ -119,6 +119,22 @@ CREATE TABLE IF NOT EXISTS subgroups (
     UNIQUE(group_id, name)
 );
 
+INSERT INTO subgroups (group_id, name, student_capacity)
+SELECT
+    sg.id,
+    data.name,
+    CASE
+        WHEN data.part_number = 1 THEN CEIL(sg.group_size::NUMERIC / 2)::INT
+        ELSE FLOOR(sg.group_size::NUMERIC / 2)::INT
+    END
+FROM student_groups sg
+CROSS JOIN (VALUES
+    ('Подгруппа 1', 1),
+    ('Подгруппа 2', 2)
+) AS data(name, part_number)
+WHERE sg.name IN ('ИВТ-21-1', 'ИБ-41м')
+ON CONFLICT (group_id, name) DO NOTHING;
+
 -- ==========================================
 -- Справочники
 -- ==========================================
@@ -512,8 +528,35 @@ CREATE TABLE IF NOT EXISTS schedule_rule_slots (
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_rule ON schedule_rule_slots(schedule_rule_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_teacher ON schedule_rule_slots(teacher_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_classroom ON schedule_rule_slots(classroom_id);
+CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_subgroup ON schedule_rule_slots(subgroup_id);
 CREATE INDEX IF NOT EXISTS idx_schedule_rule_slots_time ON schedule_rule_slots(day_of_week, parity, time_slot_id);
 
+CREATE OR REPLACE FUNCTION validate_schedule_rule_slot_subgroup()
+RETURNS TRIGGER AS $$
+DECLARE
+    lesson_type_name VARCHAR(50);
+BEGIN
+    IF NEW.subgroup_id IS NULL THEN
+        RETURN NEW;
+    END IF;
+
+    SELECT name INTO lesson_type_name
+    FROM lesson_types
+    WHERE id = NEW.lesson_type_id;
+
+    IF lesson_type_name IS NULL OR LOWER(lesson_type_name) NOT LIKE '%лаб%' THEN
+        RAISE EXCEPTION 'Подгруппы можно выбирать только для лабораторных занятий';
+    END IF;
+
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER validate_schedule_rule_slot_subgroup
+    BEFORE INSERT OR UPDATE ON schedule_rule_slots
+    FOR EACH ROW
+    EXECUTE FUNCTION validate_schedule_rule_slot_subgroup();
+
 CREATE TEMP TABLE tmp_default_rules AS
 SELECT
     NEXTVAL(PG_GET_SERIAL_SEQUENCE('schedule_rules', 'id')) AS schedule_rule_id,