баг-фикс завершён

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

@@ -254,12 +254,14 @@ ON CONFLICT (name) DO NOTHING;
 CREATE TABLE IF NOT EXISTS student_groups (
     id BIGSERIAL PRIMARY KEY,
     name VARCHAR(100) NOT NULL,
-    group_size BIGINT NOT NULL,
+    group_size BIGINT NOT NULL
+        CONSTRAINT chk_student_groups_group_size_positive CHECK (group_size > 0),
     education_form_id BIGINT NOT NULL REFERENCES education_forms(id),
     department_id BIGINT NOT NULL REFERENCES departments(id),
     specialty_id BIGINT NOT NULL REFERENCES specialties(id),
     specialty_profile_id BIGINT NOT NULL REFERENCES specialty_profiles(id),
-    year_start_study BIGINT NOT NULL,
+    year_start_study BIGINT NOT NULL
+        CONSTRAINT chk_student_groups_year_start_positive CHECK (year_start_study > 0),
     created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
     status VARCHAR(20) NOT NULL DEFAULT 'ACTIVE',
     active_from DATE,
@@ -289,7 +291,8 @@ CREATE TABLE IF NOT EXISTS subgroups (
     id BIGSERIAL PRIMARY KEY,
     group_id BIGINT NOT NULL REFERENCES student_groups(id) ON DELETE CASCADE,
     name VARCHAR(100) NOT NULL,
-    student_capacity INT,
+    student_capacity INT NOT NULL
+        CONSTRAINT chk_subgroups_student_capacity_positive CHECK (student_capacity > 0),
     status VARCHAR(20) NOT NULL DEFAULT 'ACTIVE',
     active_from DATE,
     active_to DATE,
@@ -299,6 +302,76 @@ CREATE TABLE IF NOT EXISTS subgroups (
     UNIQUE(group_id, name)
 );
 
+CREATE OR REPLACE FUNCTION validate_student_group_subgroup_capacity()
+RETURNS TRIGGER AS $$
+DECLARE
+    active_capacity BIGINT;
+BEGIN
+    SELECT COALESCE(SUM(student_capacity), 0)
+    INTO active_capacity
+    FROM subgroups
+    WHERE group_id = NEW.id
+      AND status <> 'ARCHIVED';
+
+    IF active_capacity > NEW.group_size THEN
+        RAISE EXCEPTION 'Сумма численностей активных подгрупп не может превышать численность группы'
+            USING ERRCODE = '23514',
+                  CONSTRAINT = 'chk_student_group_subgroup_capacity';
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER validate_student_group_subgroup_capacity
+    BEFORE UPDATE OF group_size ON student_groups
+    FOR EACH ROW
+    EXECUTE FUNCTION validate_student_group_subgroup_capacity();
+
+CREATE OR REPLACE FUNCTION validate_subgroup_student_capacity()
+RETURNS TRIGGER AS $$
+DECLARE
+    group_capacity BIGINT;
+    allocated_capacity BIGINT;
+BEGIN
+    SELECT group_size
+    INTO group_capacity
+    FROM student_groups
+    WHERE id = NEW.group_id
+    FOR UPDATE;
+
+    IF group_capacity IS NULL OR NEW.status = 'ARCHIVED' THEN
+        RETURN NEW;
+    END IF;
+
+    IF TG_OP = 'INSERT' THEN
+        SELECT COALESCE(SUM(student_capacity), 0)
+        INTO allocated_capacity
+        FROM subgroups
+        WHERE group_id = NEW.group_id
+          AND status <> 'ARCHIVED';
+    ELSE
+        SELECT COALESCE(SUM(student_capacity), 0)
+        INTO allocated_capacity
+        FROM subgroups
+        WHERE group_id = NEW.group_id
+          AND status <> 'ARCHIVED'
+          AND id <> OLD.id;
+    END IF;
+
+    IF allocated_capacity + NEW.student_capacity > group_capacity THEN
+        RAISE EXCEPTION 'Сумма численностей активных подгрупп не может превышать численность группы'
+            USING ERRCODE = '23514',
+                  CONSTRAINT = 'chk_student_group_subgroup_capacity';
+    END IF;
+    RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER validate_subgroup_student_capacity
+    BEFORE INSERT OR UPDATE OF group_id, student_capacity, status ON subgroups
+    FOR EACH ROW
+    EXECUTE FUNCTION validate_subgroup_student_capacity();
+
 INSERT INTO subgroups (group_id, name, student_capacity)
 SELECT
     sg.id,