diff --git a/app/__init__.py b/app/__init__.py
index fd25c26..1c9cb05 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -66,6 +66,8 @@ def ep_healthcheck():
 
 @app.route("/reset_users_because_postman_is_dumb_like_that")
 def ep_reset():
+    db.session.query(RecordModel).delete()
+    db.session.query(CategoryModel).delete()
     db.session.query(UserModel).delete()
     db.session.commit()
     return {}, 200
@@ -132,12 +134,12 @@ def ep_category_get():
     body = request.json
 
     if 'uuid' in body:
-        category = ldb.get_category(body['uuid'])
+        result = db.session.query(CategoryModel).filter(CategoryModel.uuid == body['uuid']).all()
 
-        if 'uuid' in category:
-            return category
+        if len(result) == 1:
+            return user_schema.dumps(result[0]), 200
         else:
-            return category, 404
+            return {}, 404
     else:
         return {}, 403
 
@@ -145,81 +147,136 @@ def ep_category_get():
 def ep_category_post():
     body = request.json
 
-    if 'name' in body:
-        r = ldb.add_category(body['name'])
-
-        if 'uuid' in r:
-            return r
-        else:
-            return r, 403
-    else:
+    if not body:
         return {}, 403
 
+    if 'uuid' in body:
+        return {}, 403
+
+    body.update({'uuid': uuid.uuid4().hex})
+
+    try:
+        _ = category_schema.load(body)
+    except ValidationError as e:
+        return {}, 403
+
+    c = CategoryModel(**body)
+
+    try:
+        db.session.add(c)
+        db.session.commit()
+    except Exception as e:
+        db.session.rollback()
+        return {}, 403
+
+    return jsonify(category_schema.load(body)), 200
+
 @app.route("/category", methods = ["DELETE"])
 def ep_category_delete():
     body = request.json
 
-    if 'uuid' in body:
-        category = ldb.del_category(body['uuid'])
-
-        if 'uuid' in category:
-            return category
-        else:
-            return category, 404
-    else:
+    if 'uuid' not in body:
         return {}, 403
 
+    cat_id = body['uuid']
+
+    try:
+        result = db.session.query(CategoryModel).filter(CategoryModel.uuid == cat_id).all()
+    except Exception as e:
+        return {}, 403
+
+    if len(result) == 0:
+        return {}, 404
+
+    db.session.query(CategoryModel).filter(CategoryModel.uuid == cat_id).delete()
+    db.session.commit()
+
+    return category_schema.dumps(result[0]), 200
+
 @app.route("/record/<record_id>", methods = ["GET"])
 def ep_record_get(record_id):
-    r = ldb.get_record(record_id)
+    result = db.session.query(RecordModel).filter(RecordModel.uuid == record_id).all()
 
-    if 'uuid' in r:
-        return r
+    if len(result) == 1:
+        return user_schema.dumps(result[0]), 200
     else:
-        return r, 404
+        return {}, 404
 
 @app.route("/record", methods = ["GET"])
 def ep_record_get_filtered():
-    options = {}
+    r = db.session.query(RecordModel)
+
+    filtered = False
 
     if 'user_id' in request.json:
-        options['user_id'] = request.json['user_id']
+        r = r.filter(RecordModel.user_uuid == request.json['user_id'])
+        filtered = True
+    elif 'user_uuid' in request.json:
+        r = r.filter(RecordModel.user_uuid == request.json['user_uuid'])
+        filtered = True
 
     if 'cat_id' in request.json:
-        options['cat_id'] = request.json['cat_id']
+        r = r.filter(RecordModel.cat_uuid == request.json['cat_id'])
+        filtered = True
+    if 'cat_uuid' in request.json:
+        r = r.filter(RecordModel.cat_uuid == request.json['cat_uuid'])
+        filtered = True
 
-    if len(list(options.keys())) == 0:
-        return [], 400
 
-    r = ldb.filter_records(options)
-
-    return json.dumps(r)
+    if filtered:
+        return records_schema.dumps(r.all())
+    else:
+        return [], 403
 
 @app.route("/record/<record_id>", methods = ["DELETE"])
 def ep_record_del(record_id):
-    r = ldb.del_record(record_id)
+    try:
+        result = db.session.query(RecordModel).filter(RecordModel.uuid == record_id).all()
+    except Exception as e:
+        return {}, 403
 
-    if 'uuid' in r:
-        return r
-    else:
-        return r, 404
+    if len(result) == 0:
+        return {}, 404
+
+    db.session.query(RecordModel).filter(RecordModel.uuid == record_id).delete()
+    db.session.commit()
+
+    return record_schema.dumps(result[0]), 200
 
 @app.route("/record", methods = ["POST"])
 def ep_record_post():
     body = request.json
 
-    if 'user_id' not in body:
-        return {}, 400
+    if not body:
+        return {}, 403
 
-    if 'cat_id' not in body:
-        return {}, 400
+    if 'uuid' in body:
+        return {}, 403
 
-    if 'amount' not in body:
-        return {}, 400
+    body.update({'uuid': uuid.uuid4().hex})
 
-    r = ldb.add_record(body['user_id'], body['cat_id'], body['amount'])
+    # backward compatibility with lab2 DB model
+    if 'cat_id' in body:
+        body.update({'cat_uuid': body['cat_id']})
+        del body['cat_id']
 
-    if 'uuid' in r:
-        return r
-    else:
-        return r, 403
+    if 'user_id' in body:
+        body.update({'user_uuid': body['user_id']})
+        del body['user_id']
+
+    try:
+        _ = record_schema.load(body)
+
+    except Exception as e:
+        return {}, 403
+
+    r = RecordModel(**body)
+
+    try:
+        db.session.add(r)
+        db.session.commit()
+    except Exception as e:
+        db.session.rollback()
+        return {}, 403
+
+    return jsonify(record_schema.load(body)), 200