diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..8f16d54
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,96 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1766902085,
+        "narHash": "sha256-coBu0ONtFzlwwVBzmjacUQwj3G+lybcZ1oeNSQkgC0M=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c0b0e0fddf73fd517c3471e546c0df87a42d53f4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1767149068,
+        "narHash": "sha256-TjfAb58Ybz/93e2jP0qD846dj+VqiY7wk+EqsxcZ708=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "6d14586a5917a1ec7f045ac97e6d00c68ea5d9f3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 03b0f37..57c0fc4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,5 +1,5 @@
 {
-  description = "chatapp";
+  description = "chatapp monorepo";
 
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
@@ -19,11 +19,13 @@
           pname = "chatapp";
           version = "0.1.0";
 
-          src = ./.;
-          cargoLock = { lockFile = ./Cargo.lock; };
+          # Point to the backend subdirectory
+          src = ./backend;
+          cargoLock = {
+            lockFile = ./backend/Cargo.lock;
+          };
 
           nativeBuildInputs = [ rust pkgs.pkg-config ];
-
           buildInputs = [ openssl ];
 
           OPENSSL_LIB_DIR = "${openssl.out}/lib";
@@ -32,10 +34,11 @@
         };
 
         devShells.default = pkgs.mkShell {
-          packages =
-            [ rust pkgs.cargo pkgs.rust-analyzer pkgs.pkg-config openssl ];
-          OPENSSL_DIR = openssl.dev;
-          PKG_CONFIG_PATH = "${openssl.dev}/lib/pkgconfig";
+          packages = [ rust pkgs.cargo pkgs.rust-analyzer pkgs.pkg-config openssl ];
+          shellHook = ''
+            export OPENSSL_DIR=${openssl.dev}
+            export PKG_CONFIG_PATH=${openssl.dev}/lib/pkgconfig
+          '';
         };
       });
 }
diff --git a/src/main.rs b/src/main.rs
index d02eab2..8e3b884 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -107,7 +107,6 @@ async fn main() -> anyhow::Result<()> {
     Ok(())
 }
 
-#[cfg(debug_assertions)]
 async fn log_json_body(req: Request, next: Next) -> Response {
     let (parts, body) = req.into_parts();