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app/extensions.py

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+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+from flask_login import LoginManager
+from flask_mail import Mail
+from flask_wtf.csrf import CSRFProtect
+from flask_limiter import Limiter
+from flask_limiter.util import get_remote_address
+
+db = SQLAlchemy()
+migrate = Migrate()
+login_manager = LoginManager()
+login_manager.login_view = 'auth.login'
+mail = Mail()
+csrf = CSRFProtect()
+limiter = Limiter(key_func=get_remote_address, default_limits=['300/day', '100/hour'])
+
+login_manager.login_message = None