started work on db

flake.nix

@@ -1,28 +1,37 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    devenv.url = "github:cachix/devenv";
-
     fenix.url = "github:nix-community/fenix";
     fenix.inputs.nixpkgs.follows = "nixpkgs";
   };
 
-  outputs = { self, nixpkgs, devenv, ... }@inputs:
+
+  outputs = { self, nixpkgs, fenix }@inputs:
   let 
-    pkgs = import nixpkgs {
-      system = "x86_64-linux";
-    };
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "aarch64-darwin"
+    ];
+    forAllSystems = f: nixpkgs.lib.genAttrs systems (system: let
+      toolchain = fenix.packages.${system}.complete;
+      pkgs = import nixpkgs {
+        inherit system;
+        overlays = [
+          (_: super: let pkgs = fenix.inputs.nixpkgs.legacyPackages.${system}; in fenix.overlays.default pkgs pkgs)
+        ];
+      };
+    in f system pkgs toolchain);
   in {
-    devShell.x86_64-linux = devenv.lib.mkShell {
-      inherit inputs pkgs;
-      modules = [
-        {
-          languages.rust = {
-            enable = true;
-            channel = "stable";
-          };
-        }
+    devShell = forAllSystems (system: pkgs: toolchain: pkgs.mkShell {
+      packages = [
+        (toolchain.withComponents [
+          "cargo" "rustc" "rustfmt" "clippy"
+        ])
+        pkgs.openssl
+        pkgs.pkg-config
       ];
-    };
+      RUST_SRC_PATH = "${toolchain.rust-src}/lib/rustlib/src/rust/library";
+    });
   };
 }