fix: resolve email saving issue and implement email substring search

update.sh

@@ -26,6 +26,13 @@ fi
 log "Navigating to ${INSTALL_DIR}"
 cd "$INSTALL_DIR" || die "Directory ${INSTALL_DIR} does not exist. Run install.sh first."
 
+# 2.1. Backup existing database
+if [ -f "${INSTALL_DIR}/data/database.db" ]; then
+  log "Backing up existing database"
+  cp "${INSTALL_DIR}/data/database.db" "${INSTALL_DIR}/data/database.db.bak"
+  log "Database backup created at ${INSTALL_DIR}/data/database.db.bak"
+fi
+
 # 3. Configure git safe directory
 log "Configuring git safe directory"
 git config --global --add safe.directory "$INSTALL_DIR" || true
@@ -79,6 +86,7 @@ log "Running health check..."
 sleep 5
 if curl -fsSI "http://127.0.0.1:${HOST_PORT}/" >/dev/null; then
   log "Update completed successfully!"
+  log "Service HTTP Status: $(curl -o /dev/null -s -w "%{http_code}" http://127.0.0.1:${HOST_PORT}/)"
   log "Container Status:"
   docker ps --filter "name=${CONTAINER_NAME}"