diff --git a/.gitignore b/.gitignore
index 4e281be..6c17783 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,8 @@ __pycache__
 .worktrees
 build
 .env
+
+# DuckDB runtime artifacts (regenerated from decp_prod.parquet at startup)
+**/decp.duckdb
+**/decp.duckdb.tmp
+**/decp.duckdb.lock
diff --git a/pyproject.toml b/pyproject.toml
index 09a1ab2..1d2cb02 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,7 @@ dependencies = [
   "unidecode",
   "dash-leaflet",
   "dash-extensions",
+  "duckdb",
   "flask-caching",
 ]