first part of master_slave relation

routes/__init__.py

@@ -1,6 +1,7 @@
 from flask import Blueprint, Flask, render_template
 from flask_login import login_required
 from models import SiteSettings
+import os
 
 def init_app(app: Flask):
     # Create blueprints
@@ -28,6 +29,11 @@ def init_app(app: Flask):
         site_settings = SiteSettings.query.first()
         return dict(site_settings=site_settings)
 
+    # Add MASTER environment variable to all templates
+    @app.context_processor
+    def inject_master():
+        return dict(is_master=os.environ.get('MASTER', 'false').lower() == 'true')
+
     # Register blueprints
     app.register_blueprint(main_bp)
     app.register_blueprint(auth_bp)