diff --git a/-/fifthtry.github.io/easy-contest/ec/Cargo.lock b/-/fifthtry.github.io/easy-contest/ec/Cargo.lock
new file mode 100644
index 0000000..86c4c0d
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/ec/Cargo.lock
@@ -0,0 +1,276 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+ "serde",
+]
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+dependencies = [
+ "bitflags",
+ "byteorder",
+ "diesel_derives",
+ "itoa",
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+
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+ "diesel_table_macro_syntax",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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+]
+
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+ "bytes",
+ "ft-sdk",
+ "http",
+ "serde",
+ "serde_json",
+]
+
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+ "ft-sys",
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+ "itoa",
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+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
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+checksum = "03468839009160513471e86a034bb2c5c0e4baae3b43f79ffc55c4a5427b3297"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/-/fifthtry.github.io/easy-contest/ec/Cargo.toml b/-/fifthtry.github.io/easy-contest/ec/Cargo.toml
new file mode 100644
index 0000000..c012267
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/ec/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "ec"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+ft-sdk = "0.1.1"
+serde = {  version = "1", features = ["derive"] }
+serde_json = "1"
+http = "1.0"
+bytes = "1.0"
diff --git a/-/fifthtry.github.io/easy-contest/ec/src/lib.rs b/-/fifthtry.github.io/easy-contest/ec/src/lib.rs
new file mode 100644
index 0000000..bd1664b
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/ec/src/lib.rs
@@ -0,0 +1,10 @@
+extern crate self as ec;
+
+mod route;
+
+#[no_mangle]
+pub extern "C" fn main_ft() {
+    let req = ft_sdk::http::current_request();
+    let resp = route::route(req);
+    ft_sdk::http::send_response(resp);
+}
diff --git a/-/fifthtry.github.io/easy-contest/ec/src/route/mod.rs b/-/fifthtry.github.io/easy-contest/ec/src/route/mod.rs
new file mode 100644
index 0000000..f701be4
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/ec/src/route/mod.rs
@@ -0,0 +1,46 @@
+pub fn route(r: http::Request<bytes::Bytes>) -> http::Response<bytes::Bytes> {
+    use ft_sdk::Layout;
+
+    match r.uri().path() {
+        // site
+        "/wasm-test/" => Dummy::page::<Hello>(r),
+        t => ft_sdk::not_found!("no route for {t}"),
+    }
+}
+
+struct Dummy {}
+
+impl ft_sdk::Layout for Dummy {
+    type Error = ft_sdk::Error;
+
+    fn from_in(_in_: ft_sdk::In, _ty: ft_sdk::RequestType) -> Result<Self, Self::Error> {
+        ft_sdk::println!("from_in 1");
+
+        Ok(Self {})
+    }
+
+    fn json(&mut self, page: serde_json::Value) -> Result<serde_json::Value, Self::Error> {
+        Ok(serde_json::json!({"page": page}))
+    }
+
+    fn render_error(e: Self::Error) -> http::Response<bytes::Bytes> {
+        ft_sdk::println!("rendering error: {e:?}");
+        ft_sdk::json_response(serde_json::json!({
+            "error": e.to_string(),
+        }))
+    }
+}
+
+#[derive(serde::Serialize)]
+pub struct Hello {
+    msg: String,
+}
+
+impl ft_sdk::Page<Dummy, ft_sdk::Error> for Hello {
+    fn page(_i: &mut Dummy) -> Result<Self, ft_sdk::Error> {
+        ft_sdk::println!("hello wasm");
+        Ok(Hello {
+            msg: "hello from ft_sdk".into(),
+        })
+    }
+}
diff --git a/-/fifthtry.github.io/easy-contest/flake.lock b/-/fifthtry.github.io/easy-contest/flake.lock
new file mode 100644
index 0000000..7481460
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/flake.lock
@@ -0,0 +1,96 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1711370797,
+        "narHash": "sha256-2xu0jVSjuKhN97dqc4bVtvEH52Rwh6+uyI1XCnzoUyI=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c726225724e681b3626acc941c6f95d2b0602087",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1706487304,
+        "narHash": "sha256-LE8lVX28MV2jWJsidW13D2qrHU/RUUONendL2Q/WlJg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "90f456026d284c22b3e3497be980b2e47d0b28ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1711419061,
+        "narHash": "sha256-+5M/czgYGqs/jKmi8bvYC+JUYboUKNTfkRiesXopeXQ=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4c11d2f698ff1149f76b69e72852d5d75f492d0c",
+        "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/-/fifthtry.github.io/easy-contest/flake.nix b/-/fifthtry.github.io/easy-contest/flake.nix
new file mode 100644
index 0000000..b852f94
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/flake.nix
@@ -0,0 +1,44 @@
+{
+  description = "Fifthtry easy contest";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
+
+  outputs = { self, nixpkgs, rust-overlay }:
+    let
+      system = "x86_64-linux";
+      overlays = [ (import rust-overlay) ];
+      pkgs = import nixpkgs {
+        inherit system overlays;
+      };
+
+      toolchain = pkgs.rust-bin.stable.latest.default.override {
+        targets = [ "wasm32-unknown-unknown" ];
+        extensions = [ "rustfmt" "clippy" "rust-src" ];
+      };
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        name = "ec-shell";
+        nativeBuildInputs = with pkgs; [
+          pkg-config
+          postgresql_14
+          openssl.dev
+        ];
+        buildInputs = with pkgs; [
+          diesel-cli
+
+          toolchain
+          rust-analyzer-unwrapped
+        ];
+
+        shellHook = ''
+          source scripts/auto.sh
+        '';
+
+        RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
+      };
+
+      formatter.${system} = pkgs.nixpkgs-fmt;
+    };
+}
diff --git a/-/fifthtry.github.io/easy-contest/scripts/auto.sh b/-/fifthtry.github.io/easy-contest/scripts/auto.sh
new file mode 100644
index 0000000..987f9be
--- /dev/null
+++ b/-/fifthtry.github.io/easy-contest/scripts/auto.sh
@@ -0,0 +1,8 @@
+function build-wasm() {
+    pushd "ec" || return 1
+    cargo build --target wasm32-unknown-unknown --release || return 1
+    cp ./target/wasm32-unknown-unknown/release/ec.wasm ../ || return 1
+
+    popd || return 1
+}
+
diff --git a/ec/Cargo.lock b/ec/Cargo.lock
new file mode 100644
index 0000000..86c4c0d
--- /dev/null
+++ b/ec/Cargo.lock
@@ -0,0 +1,276 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "autocfg"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1fdabc7756949593fe60f30ec81974b613357de856987752631dea1e3394c80"
+
+[[package]]
+name = "bitflags"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+
+[[package]]
+name = "byteorder"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+
+[[package]]
+name = "bytes"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
+
+[[package]]
+name = "chrono"
+version = "0.4.37"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a0d04d43504c61aa6c7531f1871dd0d418d91130162063b789da00fd7057a5e"
+dependencies = [
+ "num-traits",
+ "serde",
+]
+
+[[package]]
+name = "diesel"
+version = "2.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03fc05c17098f21b89bc7d98fe1dd3cce2c11c2ad8e145f2a44fe08ed28eb559"
+dependencies = [
+ "bitflags",
+ "byteorder",
+ "diesel_derives",
+ "itoa",
+]
+
+[[package]]
+name = "diesel_derives"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d02eecb814ae714ffe61ddc2db2dd03e6c49a42e269b5001355500d431cce0c"
+dependencies = [
+ "diesel_table_macro_syntax",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "diesel_table_macro_syntax"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc5557efc453706fed5e4fa85006fe9817c224c3f480a34c7e5959fd700921c5"
+dependencies = [
+ "syn",
+]
+
+[[package]]
+name = "ec"
+version = "0.1.0"
+dependencies = [
+ "bytes",
+ "ft-sdk",
+ "http",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
+dependencies = [
+ "percent-encoding",
+]
+
+[[package]]
+name = "ft-sdk"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac01a07cfdb0d05928cfba5299f62fa141c41dad23541d080d0f1395dc203f43"
+dependencies = [
+ "bytes",
+ "chrono",
+ "diesel",
+ "ft-sys",
+ "http",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "thiserror",
+]
+
+[[package]]
+name = "ft-sys"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "626a184e388c1b125406a464b5d11d9f215ff3fe28f7078f04e3d8f6b452b7f5"
+dependencies = [
+ "bytes",
+ "chrono",
+ "diesel",
+ "ft-sys-shared",
+ "http",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "ft-sys-shared"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02b9ba40e9516fd4cf1a8d11b834ea7e9d4670db6594461ddfdae8b5bf9b1d53"
+dependencies = [
+ "bytes",
+ "http",
+ "serde",
+ "thiserror",
+]
+
+[[package]]
+name = "http"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21b9ddb458710bc376481b842f5da65cdf31522de232c1ca8146abce2a358258"
+dependencies = [
+ "bytes",
+ "fnv",
+ "itoa",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+
+[[package]]
+name = "num-traits"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da0df0e5185db44f69b44f26786fe401b6c293d1907744beaa7fa62b2e5a517a"
+dependencies = [
+ "autocfg",
+]
+
+[[package]]
+name = "percent-encoding"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "ryu"
+version = "1.0.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e86697c916019a8588c99b5fac3cead74ec0b4b819707a682fd4d23fa0ce1ba1"
+
+[[package]]
+name = "serde"
+version = "1.0.197"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.197"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "serde_json"
+version = "1.0.115"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12dc5c46daa8e9fdf4f5e71b6cf9a53f2487da0e86e55808e2d35539666497dd"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "002a1b3dbf967edfafc32655d0f377ab0bb7b994aa1d32c8cc7e9b8bf3ebb8f0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03468839009160513471e86a034bb2c5c0e4baae3b43f79ffc55c4a5427b3297"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.58"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
diff --git a/ec/Cargo.toml b/ec/Cargo.toml
new file mode 100644
index 0000000..c012267
--- /dev/null
+++ b/ec/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "ec"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+ft-sdk = "0.1.1"
+serde = {  version = "1", features = ["derive"] }
+serde_json = "1"
+http = "1.0"
+bytes = "1.0"
diff --git a/ec/src/lib.rs b/ec/src/lib.rs
new file mode 100644
index 0000000..bd1664b
--- /dev/null
+++ b/ec/src/lib.rs
@@ -0,0 +1,10 @@
+extern crate self as ec;
+
+mod route;
+
+#[no_mangle]
+pub extern "C" fn main_ft() {
+    let req = ft_sdk::http::current_request();
+    let resp = route::route(req);
+    ft_sdk::http::send_response(resp);
+}
diff --git a/ec/src/route/mod.rs b/ec/src/route/mod.rs
new file mode 100644
index 0000000..f701be4
--- /dev/null
+++ b/ec/src/route/mod.rs
@@ -0,0 +1,46 @@
+pub fn route(r: http::Request<bytes::Bytes>) -> http::Response<bytes::Bytes> {
+    use ft_sdk::Layout;
+
+    match r.uri().path() {
+        // site
+        "/wasm-test/" => Dummy::page::<Hello>(r),
+        t => ft_sdk::not_found!("no route for {t}"),
+    }
+}
+
+struct Dummy {}
+
+impl ft_sdk::Layout for Dummy {
+    type Error = ft_sdk::Error;
+
+    fn from_in(_in_: ft_sdk::In, _ty: ft_sdk::RequestType) -> Result<Self, Self::Error> {
+        ft_sdk::println!("from_in 1");
+
+        Ok(Self {})
+    }
+
+    fn json(&mut self, page: serde_json::Value) -> Result<serde_json::Value, Self::Error> {
+        Ok(serde_json::json!({"page": page}))
+    }
+
+    fn render_error(e: Self::Error) -> http::Response<bytes::Bytes> {
+        ft_sdk::println!("rendering error: {e:?}");
+        ft_sdk::json_response(serde_json::json!({
+            "error": e.to_string(),
+        }))
+    }
+}
+
+#[derive(serde::Serialize)]
+pub struct Hello {
+    msg: String,
+}
+
+impl ft_sdk::Page<Dummy, ft_sdk::Error> for Hello {
+    fn page(_i: &mut Dummy) -> Result<Self, ft_sdk::Error> {
+        ft_sdk::println!("hello wasm");
+        Ok(Hello {
+            msg: "hello from ft_sdk".into(),
+        })
+    }
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..7481460
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,96 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1711370797,
+        "narHash": "sha256-2xu0jVSjuKhN97dqc4bVtvEH52Rwh6+uyI1XCnzoUyI=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c726225724e681b3626acc941c6f95d2b0602087",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1706487304,
+        "narHash": "sha256-LE8lVX28MV2jWJsidW13D2qrHU/RUUONendL2Q/WlJg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "90f456026d284c22b3e3497be980b2e47d0b28ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1711419061,
+        "narHash": "sha256-+5M/czgYGqs/jKmi8bvYC+JUYboUKNTfkRiesXopeXQ=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "4c11d2f698ff1149f76b69e72852d5d75f492d0c",
+        "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
new file mode 100644
index 0000000..b852f94
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,44 @@
+{
+  description = "Fifthtry easy contest";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
+
+  outputs = { self, nixpkgs, rust-overlay }:
+    let
+      system = "x86_64-linux";
+      overlays = [ (import rust-overlay) ];
+      pkgs = import nixpkgs {
+        inherit system overlays;
+      };
+
+      toolchain = pkgs.rust-bin.stable.latest.default.override {
+        targets = [ "wasm32-unknown-unknown" ];
+        extensions = [ "rustfmt" "clippy" "rust-src" ];
+      };
+    in
+    {
+      devShells.${system}.default = pkgs.mkShell {
+        name = "ec-shell";
+        nativeBuildInputs = with pkgs; [
+          pkg-config
+          postgresql_14
+          openssl.dev
+        ];
+        buildInputs = with pkgs; [
+          diesel-cli
+
+          toolchain
+          rust-analyzer-unwrapped
+        ];
+
+        shellHook = ''
+          source scripts/auto.sh
+        '';
+
+        RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
+      };
+
+      formatter.${system} = pkgs.nixpkgs-fmt;
+    };
+}
diff --git a/manifest.json b/manifest.json
index 6e2f6ba..c95e8b3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -30,11 +30,41 @@
       "checksum": "4AC02C312CD49078232DCEA74827AD05B49402125CA79BB0FEFE1B62173177E8",
       "size": 1063
     },
+    "ec/Cargo.lock": {
+      "name": "ec/Cargo.lock",
+      "checksum": "EBB625D8EE8203C7BD393051D72A21119486C34627948FF9C8A209210B7052B1",
+      "size": 6714
+    },
+    "ec/Cargo.toml": {
+      "name": "ec/Cargo.toml",
+      "checksum": "4BAF1502A57F2CB36A870E27F23B2846D93578313BC5DC7C08568981B2B3464F",
+      "size": 313
+    },
+    "ec/src/lib.rs": {
+      "name": "ec/src/lib.rs",
+      "checksum": "C5EA4D065FCB4D96B44F5E49BEA7E64C447105A938355ED74D479C365A2E1891",
+      "size": 203
+    },
+    "ec/src/route/mod.rs": {
+      "name": "ec/src/route/mod.rs",
+      "checksum": "64D24226621D43BCFCC31ED48F0BF4AFA060E76311D2DBF244D200C8DA7829DA",
+      "size": 1175
+    },
     "favicon.ico": {
       "name": "favicon.ico",
       "checksum": "65056A1D6C6AAE6E3DC4626E29F4BD4B628B17A8E9CC1D3A5E8FE9F6743F306B",
       "size": 15406
     },
+    "flake.lock": {
+      "name": "flake.lock",
+      "checksum": "C977FB32E3FDD322D72A4EA04470ED36CB33D590381A6878FA567CFB56A15765",
+      "size": 2461
+    },
+    "flake.nix": {
+      "name": "flake.nix",
+      "checksum": "240DA4EA5667250994F97689805295A0FB491A1962305D0E10871AEC9E9F48E6",
+      "size": 1083
+    },
     "index.ftd": {
       "name": "index.ftd",
       "checksum": "FB3923216E6D1BCDAD11344E1627D901F2B6B6DD25345574059DAA9D26297D37",
@@ -54,8 +84,18 @@
       "name": "rules.ftd",
       "checksum": "E45E5DF6FFE4BF062C1111417D0157A194C04948E8BAD77EB221699D9CB4FCB8",
       "size": 99
+    },
+    "scripts/auto.sh": {
+      "name": "scripts/auto.sh",
+      "checksum": "8838A1913C0C04DE52AA5920F724451EED317E9B1910231EE47846329ADF1DC9",
+      "size": 217
+    },
+    "todo.md": {
+      "name": "todo.md",
+      "checksum": "3F51194CC57AFBF677C47A3425228171822EFE28F4F9CC58F3216CFA09A7358B",
+      "size": 28
     }
   },
   "zip_url": "https://codeload.github.com/fifthtry/easy-contest/zip/refs/heads/main",
-  "checksum": "FB70F9F76BD19CF9E093F645F44F786D9B393A84041207C2C00EFD50805EA294"
+  "checksum": "A33388F0B77FD292203CBF467D5BE0AC4518CD954780EE87C53E75158A09D929"
 }
diff --git a/scripts/auto.sh b/scripts/auto.sh
new file mode 100644
index 0000000..987f9be
--- /dev/null
+++ b/scripts/auto.sh
@@ -0,0 +1,8 @@
+function build-wasm() {
+    pushd "ec" || return 1
+    cargo build --target wasm32-unknown-unknown --release || return 1
+    cp ./target/wasm32-unknown-unknown/release/ec.wasm ../ || return 1
+
+    popd || return 1
+}
+