Enable SQL foreign key support for SQLite

gns3server/db/tasks.py

@@ -22,6 +22,8 @@ from fastapi.encoders import jsonable_encoder
 from pydantic import ValidationError
 
 from typing import List
+from sqlalchemy import event
+from sqlalchemy.engine import Engine
 from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
 from gns3server.db.repositories.computes import ComputesRepository
@@ -49,6 +51,16 @@ async def connect_to_db(app: FastAPI) -> None:
         log.error(f"Error while connecting to database '{db_url}: {e}")
 
 
+@event.listens_for(Engine, "connect")
+def set_sqlite_pragma(dbapi_connection, connection_record):
+
+    # Enable SQL foreign key support for SQLite
+    # https://docs.sqlalchemy.org/en/14/dialects/sqlite.html#foreign-key-support
+    cursor = dbapi_connection.cursor()
+    cursor.execute("PRAGMA foreign_keys=ON")
+    cursor.close()
+
+
 async def get_computes(app: FastAPI) -> List[dict]:
 
     computes = []