diff --git a/.gitmodules b/.gitmodules
index 381ac09..4adc18c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,3 +2,6 @@
 	path = ql
 	url = https://github.com/github/codeql.git
 	branch = lgtm.com
+[submodule "extern/duckdb"]
+	path = extern/duckdb
+	url = https://github.com/hohn/duckdb
diff --git a/assets/postgres-database.zip b/assets/postgres-database.zip
new file mode 100644
index 0000000..690872d
--- /dev/null
+++ b/assets/postgres-database.zip
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:8287c27e4f7b6fcb52367ef548fef3d6f4040698f151decec9909a00a2462877
+size 115799582
diff --git a/extern/duckdb b/extern/duckdb
new file mode 160000
index 0000000..e1c3860
--- /dev/null
+++ b/extern/duckdb
@@ -0,0 +1 @@
+Subproject commit e1c3860d4028ab48bcb6dbd3b046dde7e9101927