Stop tracking SQLite WAL/SHM runtime files.

Extend gitignore so local database sidecars are not committed.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -57,6 +57,8 @@ build/
 **/data/uploads/
 **/data/exports/
 **/*.db
+**/*.db-shm
+**/*.db-wal
 **/*.sqlite
 **/*.sqlite3
 

ar-aging-app/.gitignore

@@ -12,6 +12,8 @@ venv/
 *.csv
 !tests/fixtures/*.xlsx
 backend/data/*.db
+backend/data/*.db-shm
+backend/data/*.db-wal
 backend/data/uploads/
 backend/data/exports/
 uploads/