Enable SQLite WAL journal

feedbackloop/app.py

 from flask import Flask
 from flask_sqlalchemy import SQLAlchemy
+from sqlalchemy.engine import Engine
+from sqlalchemy import event
 
 
 app = Flask(__name__)
@@ -7,3 +9,10 @@ app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///:memory:'
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
 db = SQLAlchemy(app)
+
+
+@event.listens_for(Engine, "connect")
+def set_sqlite_pragma(dbapi_connection, connection_record):
+    cursor = dbapi_connection.cursor()
+    cursor.execute("PRAGMA journal_mode=WAL")
+    cursor.close()