starting

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "Rust dev env for Meltano toy project";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            rustup
+            pkg-config
+            openssl
+            postgresql
+            sqlx-cli
+          ];
+
+          shellHook = ''
+            export DATABASE_URL=postgres://app:app123@localhost:5432/app_db
+            echo "✅ Rust + PostgreSQL dev env ready"
+          '';
+        };
+      });
+}