fix: improve error handling in sqlx-prepare script for untracked changes

script/sqlx-prepare.sh

@@ -3,4 +3,13 @@
 SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
 
 cd "$SCRIPT_DIR/../backend"
+
+# Generate sqlx-data.json
 cargo sqlx prepare --workspace
+
+# Check if sqlx-data.json was modified and is not staged
+if ! git diff --quiet .sqlx; then
+  echo "Error: json files in .sqlx were modified by 'cargo sqlx prepare' but are not staged."
+  echo "Please run 'git add backend/.sqlx' and try again."
+  exit 1
+fi