Update app.py

app.py

@@ -1,11 +1,27 @@
-from flask import Flask
+from flask import Flask, request, jsonify
 from flask_cors import CORS
 from db import init_db
 from routes.api import api
 from routes.dashboard import dashboard
 
 app = Flask(__name__)
-CORS(app)  # Allow cross-origin requests from the Tampermonkey script
+
+CORS(app, resources={r"/*": {"origins": "*"}}, supports_credentials=False)
+
+# Belt-and-suspenders: inject CORS headers on every response,
+# including error responses that flask-cors might miss.
+@app.after_request
+def add_cors_headers(response):
+    response.headers['Access-Control-Allow-Origin']  = '*'
+    response.headers['Access-Control-Allow-Methods'] = 'GET, POST, DELETE, OPTIONS'
+    response.headers['Access-Control-Allow-Headers'] = 'Content-Type, Authorization'
+    return response
+
+# Explicitly handle OPTIONS preflight for all routes
+@app.route('/', defaults={'path': ''}, methods=['OPTIONS'])
+@app.route('/<path:path>', methods=['OPTIONS'])
+def handle_options(path):
+    return jsonify({}), 200
 
 app.register_blueprint(api)
 app.register_blueprint(dashboard)