Add improvements 2

Tiltfile

@@ -7,6 +7,13 @@
 #   - PostgreSQL pgcrypto extension and audit logging
 #   - Organized resource dependencies and live-reload capabilities
 #   - Local registry for faster image builds and deployments
+#
+# Build Optimization:
+#   - Services only rebuild when their specific code changes (not all services)
+#   - Shared folder changes trigger rebuild of ALL services (as they all depend on it)
+#   - Uses 'only' parameter to watch only relevant files per service
+#   - Frontend only rebuilds when frontend/ code changes
+#   - Gateway only rebuilds when gateway/ or shared/ code changes
 # =============================================================================
 
 # =============================================================================
@@ -197,16 +204,25 @@ k8s_yaml(kustomize('infrastructure/kubernetes/overlays/dev'))
 # =============================================================================
 
 # Helper function for Python services with live updates
+# This function ensures services only rebuild when their specific code changes,
+# but all services rebuild when shared/ folder changes
 def build_python_service(service_name, service_path):
     docker_build(
         'bakery/' + service_name,
         context='.',
         dockerfile='./services/' + service_path + '/Dockerfile',
+        # Only watch files relevant to this specific service + shared code
+        only=[
+            './services/' + service_path,
+            './shared',
+            './scripts',
+        ],
         live_update=[
             # Fall back to full image build if Dockerfile or requirements change
             fall_back_on([
                 './services/' + service_path + '/Dockerfile',
-                './services/' + service_path + '/requirements.txt'
+                './services/' + service_path + '/requirements.txt',
+                './shared/requirements-tracing.txt',
             ]),
 
             # Sync service code
@@ -290,10 +306,21 @@ docker_build(
     'bakery/gateway',
     context='.',
     dockerfile='./gateway/Dockerfile',
+    # Only watch gateway-specific files and shared code
+    only=[
+        './gateway',
+        './shared',
+        './scripts',
+    ],
     live_update=[
-        fall_back_on(['./gateway/Dockerfile', './gateway/requirements.txt']),
+        fall_back_on([
+            './gateway/Dockerfile',
+            './gateway/requirements.txt',
+            './shared/requirements-tracing.txt',
+        ]),
         sync('./gateway', '/app'),
         sync('./shared', '/app/shared'),
+        sync('./scripts', '/app/scripts'),
         run('kill -HUP 1', trigger=['./gateway/**/*.py', './shared/**/*.py']),
     ],
     ignore=[
@@ -680,6 +707,13 @@ Documentation:
   docs/SECURITY_IMPLEMENTATION_COMPLETE.md
   docs/DATABASE_SECURITY_ANALYSIS_REPORT.md
 
+Build Optimization Active:
+  ✅ Services only rebuild when their code changes
+  ✅ Shared folder changes trigger ALL services (as expected)
+  ✅ Reduces unnecessary rebuilds and disk usage
+  💡 Edit service code: only that service rebuilds
+  💡 Edit shared/ code: all services rebuild (required)
+
 Useful Commands:
   # Work on specific services only
   tilt up <service-name> <service-name>