Added flake

.envrc

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+use flake

.gitignore

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+.direnv

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1747032016,
+        "narHash": "sha256-xp5diwyZaYzARP7MYB9upoKemvbKIsj905aviRFK8DQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f79b568519a89d35ca8c6e10b2fb5dc389826a99",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs";
+
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  }: let
+    system = "x86_64-linux";
+    pkgs = nixpkgs.legacyPackages.${system};
+  in {
+    devShells.x86_64-linux.default =
+      pkgs.mkShell
+      {
+        nativeBuildInputs = [
+          (pkgs.python3.withPackages
+            (x: [x.flask x.flask-wtf x.wtforms x.flask-sqlalchemy]))
+          pkgs.entr
+        ];
+      };
+  };
+}