diff --git a/.gitignore b/.gitignore
index d773489..763bcc3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -51,3 +51,13 @@ Thumbs.db
 # Backup files
 *.bak
 *.backup
+
+# Data files (TecDoc downloads, too large for git)
+data/
+
+# SQLite WAL files
+*.db-shm
+*.db-wal
+
+# Diagram images (served from static, too large for git)
+dashboard/static/diagrams/