feat: days 1 2 3 done with duckdb

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "Advent of Code 2025";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    devenv.url = "github:cachix/devenv";
+  };
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      devenv,
+      ...
+    }@inputs:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+      lib = pkgs.lib;
+    in
+    {
+      devShells.${system}.default = devenv.lib.mkShell {
+        inherit inputs pkgs;
+        modules = [
+          (
+            { pkgs, config, ... }:
+            {
+              # languages.enable = true;
+              packages = with pkgs; [
+                duckdb
+              ];
+
+              enterShell = ''
+                echo "Thanks Topaz!"
+              '';
+            }
+          )
+        ];
+      };
+    };
+}