diff --git a/PostgresDB/default.nix b/PostgresDB/default.nix
new file mode 100644
index 0000000..b7678a0
--- /dev/null
+++ b/PostgresDB/default.nix
@@ -0,0 +1,26 @@
+{ stdenv, pkgs }:
+{ postgresUsername
+, postgresPassword
+, postgresDatabase
+}:
+
+# From https://github.com/svanderburg/dysnomia/blob/master/dysnomia-modules/postgresql-database.in
+# and https://github.com/svanderburg/dysnomia/blob/master/tests/deployment/postgresql-database.nix
+#
+# On activation, an initial dump can be restored. If the mutable component
+# contains a sub folder named postgresql-databases/, then the dump files stored
+# inside get imported.
+
+stdenv.mkDerivation {
+  name = postgresDatabase;
+
+  src = pkgs.writeTextDir "${postgresDatabase}.sql" ''
+    CREATE USER "${postgresUsername}" WITH PASSWORD '${postgresPassword}';
+    GRANT ALL PRIVILEGES ON DATABASE "${postgresUsername}" TO "${postgresDatabase}";
+  '';
+
+  buildCommand = ''
+    mkdir -p $out/postgresql-databases
+    cp $src/*.sql $out/postgresql-databases
+  '';
+}
diff --git a/all-packages.nix b/all-packages.nix
new file mode 100644
index 0000000..6715e83
--- /dev/null
+++ b/all-packages.nix
@@ -0,0 +1,14 @@
+{ distribution ? null
+, services ? null
+, system ? builtins.currentSystem
+, pkgs ? import <nixpkgs> { inherit system; }
+}:
+
+let
+  callPackage = pkgs.lib.callPackageWith (pkgs // self);
+
+  self = {
+    PostgresDB = callPackage ./PostgresDB {};
+  };
+in
+self