commit 486b6705565a23d25eea46291ce1c28d44b1a159
Author: emilis <emilis@puff.place>
Date:   Wed Oct 29 08:51:52 2025 +0000

    initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2e11071
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,3 @@
+[workspace]
+resolver = "3"
+members = ["plan", "plan-proto", "plan-server", "plan-macros"]
diff --git a/migrations/1_init.sql b/migrations/1_init.sql
new file mode 100644
index 0000000..1166cae
--- /dev/null
+++ b/migrations/1_init.sql
@@ -0,0 +1,113 @@
+drop table if exists users cascade;
+create table users (
+	id uuid not null default gen_random_uuid() primary key,
+	name text,
+	username text not null,
+	password_hash text not null,
+
+	created_at timestamp with time zone not null,
+	updated_at timestamp with time zone not null,
+
+	check (created_at <= updated_at)
+);
+drop index if exists users_username_idx;
+create index users_username_idx on users (username);
+drop index if exists users_username_unique;
+create unique index users_username_unique on users (lower(username));
+
+drop table if exists plans cascade;
+create table plans (
+	id uuid not null default gen_random_uuid() primary key,
+	title text,
+	created_by uuid not null references users(id),
+	start_time timestamp with time zone not null,
+
+	created_at timestamp with time zone not null,
+	updated_at timestamp with time zone not null,
+
+	check (created_at <= updated_at)
+);
+
+drop type if exists half_hour cascade;
+create type half_hour as enum (
+	'Hour0Min0',
+	'Hour0Min30',
+	'Hour1Min0',
+	'Hour1Min30',
+	'Hour2Min0',
+	'Hour2Min30',
+	'Hour3Min0',
+	'Hour3Min30',
+	'Hour4Min0',
+	'Hour4Min30',
+	'Hour5Min0',
+	'Hour5Min30',
+	'Hour6Min0',
+	'Hour6Min30',
+	'Hour7Min0',
+	'Hour7Min30',
+	'Hour8Min0',
+	'Hour8Min30',
+	'Hour9Min0',
+	'Hour9Min30',
+	'Hour10Min0',
+	'Hour10Min30',
+	'Hour11Min0',
+	'Hour11Min30',
+	'Hour12Min0',
+	'Hour12Min30',
+	'Hour13Min0',
+	'Hour13Min30',
+	'Hour14Min0',
+	'Hour14Min30',
+	'Hour15Min0',
+	'Hour15Min30',
+	'Hour16Min0',
+	'Hour16Min30',
+	'Hour17Min0',
+	'Hour17Min30',
+	'Hour18Min0',
+	'Hour18Min30',
+	'Hour19Min0',
+	'Hour19Min30',
+	'Hour20Min0',
+	'Hour20Min30',
+	'Hour21Min0',
+	'Hour21Min30',
+	'Hour22Min0',
+	'Hour22Min30',
+	'Hour23Min0',
+	'Hour23Min30'
+);
+
+drop table if exists plan_days cascade;
+create table plan_days (
+	id uuid not null default gen_random_uuid() primary key,
+	plan_id uuid not null references plans(id),
+	day_offset smallint not null,
+	day_start half_hour not null,
+	day_end half_hour not null,
+
+	check (day_offset >= 0),
+	unique(plan_id, day_offset)
+);
+
+drop table if exists day_tiles cascade;
+create table day_tiles (
+	day_id uuid not null references plan_days(id),
+	user_id uuid not null references users(id),
+	tiles half_hour[] not null,
+	updated_at timestamp with time zone not null default now(),
+
+	unique(day_id, user_id)
+);
+
+drop table if exists login_tokens cascade;
+create table login_tokens (
+	token text not null primary key,
+	user_id uuid not null references users(id),
+	created_at timestamp with time zone not null,
+	expires_at timestamp with time zone not null,
+
+	check (created_at < expires_at)
+);
diff --git a/pkg/plan.service b/pkg/plan.service
new file mode 100644
index 0000000..76cbe32
--- /dev/null
+++ b/pkg/plan.service
@@ -0,0 +1,19 @@
+[Unit]
+Description=group plan
+After=network.target
+
+[Service]
+Type=simple
+
+User=plan
+Group=plan
+
+WorkingDirectory=/home/plan
+Environment=RUST_LOG=info
+Environment=PORT=3028
+ExecStart=/home/plan/plan-server
+
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
diff --git a/plan-macros/Cargo.toml b/plan-macros/Cargo.toml
new file mode 100644
index 0000000..04d5ef5
--- /dev/null
+++ b/plan-macros/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "plan-macros"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1"
+quote = "1"
+syn = { version = "2", features = ["full", "extra-traits"] }
+convert_case = { version = "0.8" }
diff --git a/plan-macros/src/hashlist.rs b/plan-macros/src/hashlist.rs
new file mode 100644
index 0000000..7a0c72a
--- /dev/null
+++ b/plan-macros/src/hashlist.rs
@@ -0,0 +1,36 @@
+use std::collections::HashMap;
+use std::hash::Hash;
+
+pub struct HashList<K: Eq + Hash, V>(HashMap<K, Vec<V>>);
+
+impl<K: Eq + Hash + core::fmt::Debug, V: core::fmt::Debug> core::fmt::Debug for HashList<K, V> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_tuple("HashList").field(&self.0).finish()
+    }
+}
+
+impl<K: Eq + Hash + Clone, V: Clone> Clone for HashList<K, V> {
+    fn clone(&self) -> Self {
+        Self(self.0.clone())
+    }
+}
+
+impl<K: Eq + Hash, V> HashList<K, V> {
+    pub fn new() -> Self {
+        Self(HashMap::new())
+    }
+
+    pub fn add(&mut self, key: K, value: V) {
+        match self.0.get_mut(&key) {
+            Some(values) => values.push(value),
+            None => {
+                self.0.insert(key, vec![value]);
+            }
+        }
+    }
+    pub fn decompose(&mut self) -> Box<[(K, Vec<V>)]> {
+        let mut body = HashMap::new();
+        core::mem::swap(&mut self.0, &mut body);
+        body.into_iter().collect()
+    }
+}
diff --git a/plan-macros/src/lib.rs b/plan-macros/src/lib.rs
new file mode 100644
index 0000000..9d1ce82
--- /dev/null
+++ b/plan-macros/src/lib.rs
@@ -0,0 +1,491 @@
+use core::error::Error;
+use std::{
+    io,
+    path::{Path, PathBuf},
+};
+
+use convert_case::Casing;
+use proc_macro2::Span;
+use quote::{ToTokens, quote};
+use syn::{parse::Parse, parse_macro_input};
+
+pub(crate) mod hashlist;
+mod targets;
+
+struct IncludePath {
+    dir_path: PathBuf,
+    modules: Vec<syn::Ident>,
+}
+
+fn display_err(span: Span, err: impl Error) -> syn::Error {
+    syn::Error::new(span, err.to_string().as_str())
+}
+
+fn read_modules(span: Span, path: &Path) -> syn::Result<Vec<syn::Ident>> {
+    let read_dir = std::fs::read_dir(path).map_err(|err| display_err(span, err))?;
+
+    Ok(read_dir
+        .map(|file| file.map_err(|err| display_err(span, err)))
+        .collect::<Result<Vec<_>, _>>()?
+        .into_iter()
+        .filter(|file| file.file_type().map(|ft| ft.is_file()).unwrap_or_default())
+        .filter_map(|file| {
+            file.file_name()
+                .to_string_lossy()
+                .strip_suffix(".rs")
+                .map(|f| f.to_string())
+        })
+        .map(|module_name| syn::Ident::new(&module_name, span))
+        .collect::<Vec<_>>())
+}
+
+impl Parse for IncludePath {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let directory = input.parse::<syn::LitStr>()?;
+
+        let dir_path = std::env::current_dir()
+            .unwrap()
+            .join(directory.value())
+            .to_path_buf();
+
+        let modules = read_modules(directory.span(), &dir_path)?;
+
+        Ok(Self { modules, dir_path })
+    }
+}
+impl IncludePath {
+    fn migrations_tokens(&self) -> proc_macro2::TokenStream {
+        let dir = std::fs::read_dir(&self.dir_path).unwrap();
+        let mut files = dir
+            .into_iter()
+            .filter_map(|d| {
+                d.ok().and_then(|d| {
+                    d.file_name()
+                        .to_string_lossy()
+                        .ends_with(".sql")
+                        .then_some(d.path())
+                })
+            })
+            .map(|path| {
+                let timestamp = path
+                    .file_name()
+                    .unwrap()
+                    .to_string_lossy()
+                    .split_once('.')
+                    .and_then(|c| c.0.parse::<u64>().ok());
+                match timestamp {
+                    Some(ts) => Ok((ts, path)),
+                    None => Err(syn::Error::new(
+                        Span::call_site(),
+                        format!("migration at [{path:?}] doesn't have a valid timestamp").as_str(),
+                    )),
+                }
+            })
+            .collect::<Result<Box<[_]>, syn::Error>>()
+            .unwrap();
+        files.sort_by_key(|f| f.0);
+        let migrations_len = files.len();
+        let includes = files.into_iter().map(|(_, path)| {
+            let path = path.to_str().unwrap();
+            quote! {
+                include_str!(#path),
+            }
+        });
+        quote! {
+            const MIGRATIONS: [&'static str, #migrations_len] = [
+                #(#includes)*
+            ];
+        }
+    }
+    fn posts_tokens(&self) -> proc_macro2::TokenStream {
+        let mod_decl = self.modules.iter().map(|module| {
+            let path = self.dir_path.join(format!("{module}.rs"));
+            let path = path.to_str().unwrap();
+            quote! {
+            mod #module {
+                include!(#path);
+            }}
+        });
+        let posts = self.modules.iter().map(|module| {
+            quote! {
+                #module::POST.into_post()
+            }
+        });
+
+        quote! {
+            #(#mod_decl)*
+
+            pub const POSTS: &[Post] = &[#(#posts),*];
+        }
+    }
+    fn normal_tokens(&self) -> proc_macro2::TokenStream {
+        let mod_decl = self.modules.iter().map(|module| {
+            quote! {mod #module;}
+        });
+        let pub_use = self.modules.iter().map(|module| {
+            quote! {
+                #module::*
+            }
+        });
+
+        quote! {
+            #(#mod_decl)*
+            pub use {#(#pub_use),*};
+        }
+    }
+}
+enum IncludeOutput {
+    Normal(IncludePath),
+    Posts(IncludePath),
+    Migrations(IncludePath),
+}
+
+impl ToTokens for IncludeOutput {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        tokens.extend(match self {
+            IncludeOutput::Normal(include_path) => include_path.normal_tokens(),
+            IncludeOutput::Posts(include_path) => include_path.posts_tokens(),
+            IncludeOutput::Migrations(include_path) => include_path.migrations_tokens(),
+        });
+    }
+}
+
+struct FileWithPath {
+    // bytes: Vec<u8>,
+    include: proc_macro2::TokenStream,
+    rel_path: String,
+}
+impl FileWithPath {
+    fn from_path(path: impl AsRef<Path>, origin_path: impl AsRef<Path>) -> Result<Self, io::Error> {
+        let abs_path = path
+            .as_ref()
+            .canonicalize()
+            .ok()
+            .and_then(|p| p.to_str().map(|t| t.to_string()))
+            .ok_or(io::Error::new(io::ErrorKind::InvalidData, "invalid path"))?;
+        let include = quote! {
+            include_bytes!(#abs_path)
+        };
+        let origin_abs = origin_path.as_ref().canonicalize().and_then(|p| {
+            p.to_str()
+                .ok_or(io::Error::new(io::ErrorKind::InvalidData, "invalid path"))
+                .map(|t| t.to_string())
+        })?;
+        let rel_path = abs_path.replace(&origin_abs, "");
+
+        Ok(Self { include, rel_path })
+    }
+}
+
+fn find_matching_files_recursive<P, F, D>(
+    p: P,
+    include_in_rerun: F,
+    directory_filter: D,
+    out: &mut Vec<FileWithPath>,
+    origin_path: &PathBuf,
+) -> Result<(), io::Error>
+where
+    P: AsRef<Path>,
+    F: Fn(&str) -> bool + Copy,
+    D: Fn(&str) -> bool + Copy,
+{
+    for item in std::fs::read_dir(p.as_ref())? {
+        let item = item?;
+        if item.file_type()?.is_dir() {
+            if directory_filter(item.file_name().to_str().ok_or(io::Error::new(
+                io::ErrorKind::InvalidData,
+                "file has no name",
+            ))?) {
+                find_matching_files_recursive(
+                    item.path(),
+                    include_in_rerun,
+                    directory_filter,
+                    out,
+                    origin_path,
+                )?;
+            }
+            continue;
+        }
+        if let Some(file_name) = item.file_name().to_str()
+            && include_in_rerun(file_name)
+        {
+            out.push(FileWithPath::from_path(item.path(), origin_path)?);
+        }
+    }
+
+    Ok(())
+}
+
+struct IncludeDist {
+    name: syn::Ident,
+    files: Vec<FileWithPath>,
+}
+
+impl IncludeDist {
+    fn read_dist_path(
+        name: syn::Ident,
+        path_span: Span,
+        path: &Path,
+        origin_path: &PathBuf,
+    ) -> syn::Result<Self> {
+        let mut files = Vec::new();
+        find_matching_files_recursive(path, |_| true, |_| true, &mut files, origin_path)
+            .map_err(|err| syn::Error::new(path_span, err.to_string()))?;
+        Ok(Self { name, files })
+    }
+}
+
+impl Parse for IncludeDist {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let name = input.parse::<syn::Ident>()?;
+        input.parse::<syn::Token![,]>()?;
+        let directory = input.parse::<syn::LitStr>()?;
+
+        let dir_path = std::env::current_dir()
+            .unwrap()
+            .join(directory.value())
+            .to_path_buf();
+
+        Self::read_dist_path(name, directory.span(), &dir_path, &dir_path)
+    }
+}
+
+impl ToTokens for IncludeDist {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        // std::collections::HashMap
+        let array_contents = self.files.iter().map(|file| {
+            let FileWithPath { include, rel_path } = file;
+
+            quote! {
+                (#rel_path, #include)
+            }
+        });
+        let name = &self.name;
+        tokens.extend(quote! {
+            pub const #name: &[(&'static str, &'static [u8])] = &[#(#array_contents),*];
+        });
+    }
+}
+
+struct StaticLinks {
+    collect_into_const: Option<syn::Ident>,
+    relative_to: PathBuf,
+    files: Vec<(String, PathBuf)>,
+}
+
+impl Parse for StaticLinks {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let collect_into_const = if input.peek(syn::Ident) {
+            let out = Some(input.parse()?);
+            input.parse::<syn::Token![=>]>()?;
+            out
+        } else {
+            None
+        };
+        const EXPECTED: &str = "expected 'relative to'";
+        let directory = input.parse::<syn::LitStr>()?;
+        {
+            let rel = input
+                .parse::<syn::Ident>()
+                .map_err(|err| syn::Error::new(err.span(), EXPECTED))?;
+            if rel != "relative" {
+                return Err(syn::Error::new(rel.span(), EXPECTED));
+            }
+        }
+        {
+            let to = input
+                .parse::<syn::Ident>()
+                .map_err(|err| syn::Error::new(err.span(), EXPECTED))?;
+            if to != "to" {
+                return Err(syn::Error::new(to.span(), EXPECTED));
+            }
+        }
+        let current_dir = std::env::current_dir().unwrap();
+        let relative_to = current_dir
+            .join(input.parse::<syn::LitStr>()?.value())
+            .canonicalize()
+            .expect("cannonicalize relative to path");
+
+        let span = directory.span();
+
+        let path_dir = current_dir
+            .join(directory.value())
+            .canonicalize()
+            .expect("canonicalize base path")
+            .to_path_buf();
+
+        let read_dir = std::fs::read_dir(&path_dir).map_err(|err| display_err(span, err))?;
+
+        let files = read_dir
+            .map(|file| file.map_err(|err| display_err(span, err)))
+            .collect::<Result<Vec<_>, _>>()?
+            .into_iter()
+            .filter(|file| file.file_type().map(|ft| ft.is_file()).unwrap_or_default())
+            .map(|file| {
+                (
+                    file.file_name().to_str().expect("bad filename").to_string(),
+                    file.path(),
+                )
+            })
+            .collect::<Vec<_>>();
+        Ok(StaticLinks {
+            collect_into_const,
+            relative_to,
+            files,
+        })
+    }
+}
+
+impl ToTokens for StaticLinks {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        let base_path = self.relative_to.to_str().expect("base path to_string");
+        let ident_with_decl = self.files.iter().map(|(file, path)| {
+            let file_ident = syn::Ident::new(
+                file.replace(['.', ' ', '-'], "_").to_uppercase().as_str(),
+                Span::call_site(),
+            );
+            let filepath = path
+                .to_str()
+                .expect("path to string")
+                .replace(base_path, "");
+            let decl = quote! {
+                pub const #file_ident: &'static str = #filepath;
+            };
+            (file_ident, decl)
+        });
+        let files = ident_with_decl.clone().map(|(_, q)| q);
+
+        tokens.extend(quote! {
+            #(#files)*
+        });
+        if let Some(collect_into_const) = &self.collect_into_const {
+            let idents = ident_with_decl.map(|(ident, _)| ident);
+            tokens.extend(quote! {
+                pub const #collect_into_const: &[&str] = &[#(#idents),*];
+            });
+        }
+    }
+}
+
+impl StaticLinks {
+    fn into_demand_metadata(self) -> StaticLinksDemandMetadata {
+        let StaticLinks {
+            collect_into_const,
+            relative_to,
+            files,
+        } = self;
+        StaticLinksDemandMetadata {
+            collect_into_const,
+            relative_to,
+            files,
+        }
+    }
+}
+
+struct StaticLinksDemandMetadata {
+    collect_into_const: Option<syn::Ident>,
+    relative_to: PathBuf,
+    files: Vec<(String, PathBuf)>,
+}
+
+impl ToTokens for StaticLinksDemandMetadata {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        let base_path = self.relative_to.to_str().expect("base path to_string");
+        let ident_with_decl = self.files.iter().map(|(file, path)| {
+            let file_ident = syn::Ident::new(
+                file.replace(['.', ' ', '-'], "_").to_uppercase().as_str(),
+                Span::call_site(),
+            );
+            let filepath = path
+                .to_str()
+                .expect("path to string")
+                .replace(base_path, "");
+            let decl = quote! {
+                pub const #file_ident: &'static str = #filepath;
+            };
+            (file_ident, filepath, decl)
+        });
+        let files = ident_with_decl.clone().map(|(_, _, q)| q);
+
+        tokens.extend(quote! {
+            #(#files)*
+        });
+        if let Some(collect_into_const) = &self.collect_into_const {
+            let idents = ident_with_decl.clone().map(|(ident, _, _)| ident);
+            tokens.extend(quote! {
+                pub const #collect_into_const: &[&str] = &[#(#idents),*];
+            });
+        }
+
+        let (paths_and_snake_idents, members): (Vec<_>, Vec<_>) = ident_with_decl
+            .clone()
+            .map(|(i, filepath, _)| {
+                let snake_ident = syn::Ident::new(
+                    i.to_string().to_case(convert_case::Case::Snake).as_str(),
+                    i.span(),
+                );
+                let member = quote! {
+                    pub #snake_ident: Metadata,
+                };
+                ((filepath, snake_ident), member)
+            })
+            .unzip();
+
+        let find_by_key = paths_and_snake_idents.iter().map(|(path, ident)| {
+            quote! {
+                #path => &self.#ident
+            }
+        });
+
+        tokens.extend(quote! {
+            pub struct MetadataMap {
+                #(#members)*
+            }
+
+            impl MetadataMap {
+                pub fn find_by_key(&self, key: &str) -> Option<&Metadata> {
+                    Some(match key {
+                        #(#find_by_key,)*
+                        _ => return None,
+                    })
+                }
+            }
+        });
+    }
+}
+
+#[proc_macro]
+pub fn include_dist(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let incl_dist = parse_macro_input!(input as IncludeDist);
+    quote! {#incl_dist}.into()
+}
+
+#[proc_macro]
+pub fn posts(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let pubuse = IncludeOutput::Posts(parse_macro_input!(input as IncludePath));
+    quote! {#pubuse}.into()
+}
+
+#[proc_macro]
+pub fn include_path(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let incl_path = IncludeOutput::Normal(parse_macro_input!(input as IncludePath));
+    quote! {#incl_path}.into()
+}
+
+#[proc_macro]
+pub fn static_links(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let static_links = parse_macro_input!(input as StaticLinks);
+    quote! {#static_links}.into()
+}
+
+#[proc_macro]
+pub fn static_links_demand_metadata(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let demand_metadata = parse_macro_input!(input as StaticLinks).into_demand_metadata();
+    quote! {#demand_metadata}.into()
+}
+
+#[proc_macro]
+pub fn migrations(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let incl_path = IncludeOutput::Migrations(parse_macro_input!(input as IncludePath));
+    quote! {#incl_path}.into()
+}
diff --git a/plan-macros/src/targets.rs b/plan-macros/src/targets.rs
new file mode 100644
index 0000000..7d53820
--- /dev/null
+++ b/plan-macros/src/targets.rs
@@ -0,0 +1,294 @@
+use convert_case::{Case, Casing};
+use proc_macro2::TokenStream;
+use quote::{ToTokens, quote, quote_spanned};
+use syn::spanned::Spanned;
+
+use crate::hashlist::HashList;
+
+const TARGETS_PATH: &str = "extract";
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+enum VariantFieldIndex {
+    Ident(syn::Ident),
+    Numeric(syn::LitInt),
+    None,
+}
+
+impl syn::parse::Parse for VariantFieldIndex {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        if input.is_empty() {
+            Ok(VariantFieldIndex::None)
+        } else if input.peek(syn::LitInt) {
+            Ok(VariantFieldIndex::Numeric(input.parse()?))
+        } else {
+            Ok(VariantFieldIndex::Ident(input.parse()?))
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+struct VariantAttr {
+    index: VariantFieldIndex,
+    alias: Option<syn::Ident>,
+}
+
+impl syn::parse::Parse for VariantAttr {
+    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
+        let index = if input.peek(syn::token::As) {
+            VariantFieldIndex::None
+        } else {
+            input.parse::<VariantFieldIndex>()?
+        };
+        if !input.peek(syn::token::As) {
+            return Ok(Self { index, alias: None });
+        }
+        input.parse::<syn::Token![as]>()?;
+
+        Ok(Self {
+            index,
+            alias: Some(input.parse()?),
+        })
+    }
+}
+
+#[derive(Debug, Clone)]
+struct TargetVariant {
+    attr: VariantAttr,
+    access: TokenStream,
+    ty: syn::Type,
+    variant: syn::Variant,
+}
+
+impl TargetVariant {
+    fn name(&self) -> syn::Ident {
+        if let Some(alias) = self.attr.alias.as_ref() {
+            return alias.clone();
+        }
+        match &self.attr.index {
+            VariantFieldIndex::Ident(ident) => ident.clone(),
+            VariantFieldIndex::Numeric(_) | VariantFieldIndex::None => self.variant.ident.clone(),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Targets {
+    name: syn::Ident,
+    targets: Vec<TargetVariant>,
+    total_fields: usize,
+}
+
+impl Targets {
+    pub fn parse(input: syn::DeriveInput) -> Result<Self, syn::Error> {
+        let name = input.ident;
+        let mut targets: Vec<TargetVariant> = Vec::new();
+        let total_fields;
+        match &input.data {
+            syn::Data::Enum(data) => {
+                total_fields = data.variants.len();
+                for field in data.variants.iter() {
+                    let field_ident = &field.ident;
+                    for attr in field.attrs.iter().filter(|attr| {
+                        attr.path()
+                            .get_ident()
+                            .map(|id| id.to_string().as_str() == TARGETS_PATH)
+                            .unwrap_or_default()
+                    }) {
+                        let attr_span = attr.span();
+                        let attr = attr.parse_args::<VariantAttr>()?;
+                        let (access, ty) = match &field.fields {
+                            syn::Fields::Named(fields) => match &attr.index {
+                                VariantFieldIndex::Ident(ident) => {
+                                    let mut matching_val = None;
+                                    let mut accesses = Vec::new();
+                                    for field in fields.named.iter() {
+                                        let matching = field
+                                            .ident
+                                            .as_ref()
+                                            .map(|i| i == ident)
+                                            .unwrap_or_default();
+                                        if matching_val.is_some() && matching {
+                                            panic!("duplicate?")
+                                        }
+
+                                        let ident = field.ident.clone().unwrap();
+                                        if matching {
+                                            matching_val = Some((ident.clone(), field.ty.clone()));
+                                            accesses.push(quote! {
+                                                #ident
+                                            });
+                                        } else {
+                                            accesses.push(quote! {
+                                                #ident: _
+                                            });
+                                        }
+                                    }
+                                    let (mut matching_ident, matching_ty) = matching_val.ok_or(
+                                        syn::Error::new(ident.span(), "no such variant field"),
+                                    )?;
+                                    matching_ident.set_span(ident.span());
+
+                                    (
+                                        quote! {
+                                            #name::#field_ident { #(#accesses),* } => &#matching_ident,
+                                        },
+                                        matching_ty,
+                                    )
+                                }
+
+                                VariantFieldIndex::Numeric(num) => {
+                                    return Err(syn::Error::new(
+                                        num.span(),
+                                        "cannot used numeric index for a variant with named fields",
+                                    ));
+                                }
+                                VariantFieldIndex::None => {
+                                    if fields.named.len() == 1 {
+                                        let field = fields.named.iter().next().unwrap();
+                                        let field_ident = field.ident.as_ref().unwrap();
+                                        (
+                                            quote! {
+                                                #name::#field_ident { #field_ident } => &#field_ident,
+                                            },
+                                            field.ty.clone(),
+                                        )
+                                    } else {
+                                        return Err(syn::Error::new(
+                                            fields.named.span(),
+                                            "unnamed field index with more than one field",
+                                        ));
+                                    }
+                                }
+                            },
+                            syn::Fields::Unnamed(fields) => {
+                                if let VariantFieldIndex::Numeric(num) = &attr.index {
+                                    let num = num.base10_parse::<u8>()? as usize;
+                                    let field = fields
+                                        .unnamed
+                                        .iter()
+                                        .nth(num)
+                                        .ok_or(syn::Error::new(
+                                            attr_span,
+                                            "field index out of range",
+                                        ))?
+                                        .clone();
+                                    let left = (0..num).map(|_| quote! {_});
+                                    let right = (num..fields.unnamed.len()).map(|_| quote! {_});
+                                    (
+                                        quote! {
+                                            #name::#field_ident(#(#left),*, val, #(#right),*) => &val,
+                                        },
+                                        field.ty.clone(),
+                                    )
+                                } else if fields.unnamed.len() == 1 {
+                                    (
+                                        quote! {
+                                            #name::#field_ident(val) => &val,
+                                        },
+                                        fields.unnamed.iter().next().unwrap().ty.clone(),
+                                    )
+                                } else {
+                                    return Err(syn::Error::new(
+                                        fields.span(),
+                                        "unnamed fields without numeric index",
+                                    ));
+                                }
+                            }
+                            syn::Fields::Unit => {
+                                return Err(syn::Error::new(
+                                    field.span(),
+                                    "target cannot be a unit field",
+                                ));
+                            }
+                        };
+                        let target = TargetVariant {
+                            attr,
+                            ty,
+                            access,
+                            variant: field.clone(),
+                        };
+                        // if targets.iter().any(|t| t.name() == target.name()) {
+                        //     return Err(syn::Error::new(attr_span, "duplicate target field"));
+                        // }
+                        // target.variant.ident.set_span(attr_span);
+
+                        targets.push(target);
+                    }
+                }
+            }
+
+            _ => todo!(),
+        };
+
+        Ok(Self {
+            name,
+            targets,
+            total_fields,
+        })
+    }
+}
+
+impl ToTokens for Targets {
+    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+        // this is so horrid and haphazard but idc rn
+        // commenting to make the criticizing voice stfu
+        let mut by_target = {
+            let mut out = HashList::new();
+            for target in self.targets.iter() {
+                out.add(target.name().to_string(), target.clone());
+            }
+            out
+        };
+        let fns = by_target.decompose().into_iter().map(|(_, targets)| {
+            if targets.is_empty() {
+                return quote! {};
+            }
+            let all_variants = targets.len() == self.total_fields;
+            let fn_ret = {
+                let ty = targets.first().unwrap().ty.clone();
+                if all_variants {
+                    quote! {&#ty}
+                } else {
+                    quote! {Option<&#ty>}
+                }
+            };
+            let fn_name = {
+                let name = targets.first().unwrap().name();
+                syn::Ident::new(name.to_string().to_case(Case::Snake).as_str(), name.span())
+            };
+            let raw_accesses = targets.iter().map(|t| {
+                let access = &t.access;
+
+                quote_spanned! { t.attr.alias.as_ref().unwrap().span() =>
+                    #access
+                }
+            });
+            let accesses = if all_variants {
+                quote! {
+                    match self {
+                        #(#raw_accesses)*
+                    }
+                }
+            } else {
+                quote! {
+                    Some(match self {
+                        #(#raw_accesses)*
+                        _ => return None,
+                    })
+                }
+            };
+
+            quote! {
+                pub const fn #fn_name(&self) -> #fn_ret {
+                    #accesses
+                }
+            }
+        });
+        let name = &self.name;
+        tokens.extend(quote! {
+            impl #name {
+                #(#fns)*
+            }
+        });
+    }
+}
diff --git a/plan-proto/Cargo.toml b/plan-proto/Cargo.toml
new file mode 100644
index 0000000..f132b9d
--- /dev/null
+++ b/plan-proto/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "plan-proto"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+chrono = { version = "0.4", features = ["serde"] }
+thiserror = { version = "2" }
+axum = { version = "*", optional = true }
+argon2 = { version = "*", optional = true }
+sqlx = { version = "*", optional = true }
+ciborium = { version = "*", optional = true }
+bytes = { version = "1.10.1", features = ["serde"], optional = true }
+axum-extra = { version = "*", optional = true }
+uuid = { version = "1", features = ["serde", "v4"] }
+log = { version = "0.4", optional = true }
+
+[features]
+server = [
+	"dep:axum",
+	"dep:sqlx",
+	"dep:argon2",
+	"dep:ciborium",
+	"dep:bytes",
+	"dep:axum-extra",
+	"dep:log",
+]
+client = ["uuid/js"]
diff --git a/plan-proto/src/cbor.rs b/plan-proto/src/cbor.rs
new file mode 100644
index 0000000..ef47f39
--- /dev/null
+++ b/plan-proto/src/cbor.rs
@@ -0,0 +1,156 @@
+use axum::{
+    body::Bytes,
+    extract::{FromRequest, Request, rejection::BytesRejection},
+    http::{HeaderMap, HeaderValue, StatusCode, header},
+    response::{IntoResponse, Response},
+};
+use axum_extra::headers::Mime;
+use bytes::{BufMut, BytesMut};
+use core::fmt::Display;
+use serde::{Serialize, de::DeserializeOwned};
+
+const CBOR_CONTENT_TYPE: &str = "application/cbor";
+const PLAIN_CONTENT_TYPE: &str = "text/plain";
+
+#[must_use]
+pub struct Cbor<T>(pub T);
+
+impl<T> Cbor<T> {
+    pub const fn new(t: T) -> Self {
+        Self(t)
+    }
+}
+
+impl<T, S> FromRequest<S> for Cbor<T>
+where
+    T: DeserializeOwned,
+    S: Send + Sync,
+{
+    type Rejection = CborRejection;
+
+    async fn from_request(req: Request, state: &S) -> Result<Self, Self::Rejection> {
+        if !cbor_content_type(req.headers()) {
+            return Err(CborRejection::MissingCborContentType);
+        }
+
+        let bytes = Bytes::from_request(req, state).await?;
+        Ok(Self(ciborium::from_reader::<T, _>(&*bytes)?))
+    }
+}
+
+impl<T> IntoResponse for Cbor<T>
+where
+    T: Serialize,
+{
+    fn into_response(self) -> axum::response::Response {
+        // Extracted into separate fn so it's only compiled once for all T.
+        fn make_response(buf: BytesMut, ser_result: Result<(), CborRejection>) -> Response {
+            match ser_result {
+                Ok(()) => (
+                    [(
+                        header::CONTENT_TYPE,
+                        HeaderValue::from_static("application/cbor"),
+                    )],
+                    buf.freeze(),
+                )
+                    .into_response(),
+                Err(err) => err.into_response(),
+            }
+        }
+
+        // Use a small initial capacity of 128 bytes like serde_json::to_vec
+        // https://docs.rs/serde_json/1.0.82/src/serde_json/ser.rs.html#2189
+        let mut buf = BytesMut::with_capacity(128).writer();
+        let res = ciborium::into_writer(&self.0, &mut buf)
+            .map_err(|err| CborRejection::SerdeRejection(err.to_string()));
+        make_response(buf.into_inner(), res)
+    }
+}
+
+#[derive(Debug)]
+pub enum CborRejection {
+    MissingCborContentType,
+    BytesRejection(BytesRejection),
+    DeserializeRejection(String),
+    SerdeRejection(String),
+}
+impl<T: Display> From<ciborium::de::Error<T>> for CborRejection {
+    fn from(value: ciborium::de::Error<T>) -> Self {
+        Self::SerdeRejection(match value {
+            ciborium::de::Error::Io(err) => format!("i/o: {err}"),
+            ciborium::de::Error::Syntax(offset) => format!("syntax error at {offset}"),
+            ciborium::de::Error::Semantic(offset, err) => format!(
+                "semantic parse: {err}{}",
+                offset
+                    .map(|offset| format!(" at {offset}"))
+                    .unwrap_or_default(),
+            ),
+            ciborium::de::Error::RecursionLimitExceeded => {
+                String::from("the input caused serde to recurse too much")
+            }
+        })
+    }
+}
+
+impl From<BytesRejection> for CborRejection {
+    fn from(value: BytesRejection) -> Self {
+        Self::BytesRejection(value)
+    }
+}
+
+impl IntoResponse for CborRejection {
+    fn into_response(self) -> axum::response::Response {
+        match self {
+            CborRejection::MissingCborContentType => (
+                StatusCode::BAD_REQUEST,
+                [(
+                    header::CONTENT_TYPE,
+                    HeaderValue::from_static(PLAIN_CONTENT_TYPE),
+                )],
+                String::from("missing cbor content type"),
+            ),
+            CborRejection::BytesRejection(err) => (
+                err.status(),
+                [(
+                    header::CONTENT_TYPE,
+                    HeaderValue::from_static(PLAIN_CONTENT_TYPE),
+                )],
+                format!("bytes rejection: {}", err.body_text()),
+            ),
+            CborRejection::SerdeRejection(err) => (
+                StatusCode::BAD_REQUEST,
+                [(
+                    header::CONTENT_TYPE,
+                    HeaderValue::from_static(PLAIN_CONTENT_TYPE),
+                )],
+                err,
+            ),
+            CborRejection::DeserializeRejection(err) => (
+                StatusCode::INTERNAL_SERVER_ERROR,
+                [(
+                    header::CONTENT_TYPE,
+                    HeaderValue::from_static(PLAIN_CONTENT_TYPE),
+                )],
+                err,
+            ),
+        }
+        .into_response()
+    }
+}
+
+fn cbor_content_type(headers: &HeaderMap) -> bool {
+    let Some(content_type) = headers.get(header::CONTENT_TYPE) else {
+        return false;
+    };
+
+    let Ok(content_type) = content_type.to_str() else {
+        return false;
+    };
+
+    let Ok(mime) = content_type.parse::<Mime>() else {
+        return false;
+    };
+
+    mime.type_() == "application"
+        && (mime.subtype() == "cbor" || mime.suffix().is_some_and(|name| name == "cbor"))
+}
diff --git a/plan-proto/src/error.rs b/plan-proto/src/error.rs
new file mode 100644
index 0000000..5a819ed
--- /dev/null
+++ b/plan-proto/src/error.rs
@@ -0,0 +1,148 @@
+use core::fmt::Display;
+
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+use crate::plan::PlanError;
+
+#[derive(Debug, Clone, PartialEq, Error, Serialize, Deserialize)]
+pub enum ServerError {
+    #[error("database error: {0}")]
+    DatabaseError(DatabaseError),
+    #[error("invalid credentials")]
+    InvalidCredentials,
+    #[error("token expired")]
+    ExpiredToken,
+    #[error("internal server error: {0}")]
+    InternalServerError(String),
+    #[error("connection error")]
+    ConnectionError,
+    #[error("invalid request: {0}")]
+    InvalidRequest(String),
+    #[error("not found")]
+    NotFound,
+}
+
+impl<I: Into<DatabaseError>> From<I> for ServerError {
+    fn from(value: I) -> Self {
+        let database_err: DatabaseError = value.into();
+        if let DatabaseError::NotFound = &database_err {
+            return Self::NotFound;
+        }
+        Self::DatabaseError(database_err)
+    }
+}
+
+impl From<PlanError> for ServerError {
+    fn from(value: PlanError) -> Self {
+        Self::InvalidRequest(value.to_string())
+    }
+}
+
+#[cfg(feature = "server")]
+impl<T: Display> From<ciborium::de::Error<T>> for ServerError {
+    fn from(_: ciborium::de::Error<T>) -> Self {
+        Self::InvalidRequest(String::from("could not decode request"))
+    }
+}
+
+#[cfg(feature = "server")]
+impl axum::response::IntoResponse for ServerError {
+    fn into_response(self) -> axum::response::Response {
+        use axum::http::StatusCode;
+
+        use crate::cbor::Cbor;
+
+        match self {
+            ServerError::ExpiredToken => {
+                (StatusCode::UNAUTHORIZED, Cbor(ServerError::ExpiredToken)).into_response()
+            }
+            ServerError::NotFound | ServerError::DatabaseError(DatabaseError::NotFound) => {
+                (StatusCode::NOT_FOUND, Cbor(ServerError::NotFound)).into_response()
+            }
+            ServerError::DatabaseError(DatabaseError::UserAlreadyExists) => (
+                StatusCode::BAD_REQUEST,
+                Cbor(ServerError::InvalidRequest(String::from("username taken"))),
+            )
+                .into_response(),
+            ServerError::DatabaseError(err) => {
+                use uuid::Uuid;
+
+                let error_id = Uuid::new_v4();
+                log::error!("database error[{error_id}]: {err}");
+
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    Cbor(ServerError::InternalServerError(format!(
+                        "internal server error. error id: {error_id}"
+                    ))),
+                )
+                    .into_response()
+            }
+            ServerError::InvalidCredentials => (
+                StatusCode::UNAUTHORIZED,
+                Cbor(ServerError::InvalidCredentials),
+            )
+                .into_response(),
+            ServerError::InternalServerError(_) => {
+                (StatusCode::INTERNAL_SERVER_ERROR, Cbor(self)).into_response()
+            }
+            ServerError::ConnectionError => {
+                (StatusCode::BAD_REQUEST, Cbor(ServerError::ConnectionError)).into_response()
+            }
+            ServerError::InvalidRequest(reason) => (
+                StatusCode::BAD_REQUEST,
+                Cbor(ServerError::InvalidRequest(reason)),
+            )
+                .into_response(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Error, Serialize, Deserialize)]
+pub enum DatabaseError {
+    #[error("user already exists")]
+    UserAlreadyExists,
+    #[error("password hashing error: {0}")]
+    PasswordHashError(String),
+    #[error("sqlx error: {0}")]
+    SqlxError(String),
+    #[error("not found")]
+    NotFound,
+}
+
+#[cfg(feature = "server")]
+impl axum::response::IntoResponse for DatabaseError {
+    fn into_response(self) -> axum::response::Response {
+        use axum::http::StatusCode;
+
+        use crate::cbor::Cbor;
+
+        (
+            match self {
+                DatabaseError::UserAlreadyExists => StatusCode::BAD_REQUEST,
+                DatabaseError::NotFound => StatusCode::NOT_FOUND,
+                _ => StatusCode::INTERNAL_SERVER_ERROR,
+            },
+            Cbor(self),
+        )
+            .into_response()
+    }
+}
+
+#[cfg(feature = "server")]
+impl From<sqlx::Error> for DatabaseError {
+    fn from(err: sqlx::Error) -> Self {
+        match err {
+            sqlx::Error::RowNotFound => Self::NotFound,
+            _ => Self::SqlxError(err.to_string()),
+        }
+    }
+}
+
+#[cfg(feature = "server")]
+impl From<argon2::password_hash::Error> for DatabaseError {
+    fn from(err: argon2::password_hash::Error) -> Self {
+        Self::PasswordHashError(err.to_string())
+    }
+}
diff --git a/plan-proto/src/lib.rs b/plan-proto/src/lib.rs
new file mode 100644
index 0000000..2075244
--- /dev/null
+++ b/plan-proto/src/lib.rs
@@ -0,0 +1,465 @@
+#![feature(step_trait)]
+
+#[cfg(feature = "server")]
+pub mod cbor;
+pub mod error;
+pub mod limited;
+pub mod message;
+pub mod plan;
+pub mod token;
+pub mod user;
+use core::{fmt::Display, ops::RangeBounds};
+
+use chrono::{DateTime, NaiveDate, NaiveTime, TimeZone, Timelike, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(
+    Debug, Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Serialize, Deserialize, Hash, Default,
+)]
+#[cfg_attr(feature = "server", derive(sqlx::Type))]
+#[cfg_attr(feature = "server", sqlx(type_name = "half_hour"))]
+// #[derive(
+//     Debug, Clone, Copy, PartialEq, PartialOrd, Eq, Ord, Serialize, Deserialize, Hash, sqlx::Type,
+// )]
+// #[sqlx(type_name = "half_hour")]
+pub enum HalfHour {
+    #[default]
+    Hour0Min0,
+    Hour0Min30,
+    Hour1Min0,
+    Hour1Min30,
+    Hour2Min0,
+    Hour2Min30,
+    Hour3Min0,
+    Hour3Min30,
+    Hour4Min0,
+    Hour4Min30,
+    Hour5Min0,
+    Hour5Min30,
+    Hour6Min0,
+    Hour6Min30,
+    Hour7Min0,
+    Hour7Min30,
+    Hour8Min0,
+    Hour8Min30,
+    Hour9Min0,
+    Hour9Min30,
+    Hour10Min0,
+    Hour10Min30,
+    Hour11Min0,
+    Hour11Min30,
+    Hour12Min0,
+    Hour12Min30,
+    Hour13Min0,
+    Hour13Min30,
+    Hour14Min0,
+    Hour14Min30,
+    Hour15Min0,
+    Hour15Min30,
+    Hour16Min0,
+    Hour16Min30,
+    Hour17Min0,
+    Hour17Min30,
+    Hour18Min0,
+    Hour18Min30,
+    Hour19Min0,
+    Hour19Min30,
+    Hour20Min0,
+    Hour20Min30,
+    Hour21Min0,
+    Hour21Min30,
+    Hour22Min0,
+    Hour22Min30,
+    Hour23Min0,
+    Hour23Min30,
+}
+
+impl HalfHour {
+    pub const fn previous_half_hour(&self) -> HalfHour {
+        match self {
+            HalfHour::Hour0Min0 => Self::Hour23Min30,
+            HalfHour::Hour0Min30 => Self::Hour0Min0,
+            HalfHour::Hour1Min0 => Self::Hour0Min30,
+            HalfHour::Hour1Min30 => Self::Hour1Min0,
+            HalfHour::Hour2Min0 => Self::Hour1Min30,
+            HalfHour::Hour2Min30 => Self::Hour2Min0,
+            HalfHour::Hour3Min0 => Self::Hour2Min30,
+            HalfHour::Hour3Min30 => Self::Hour3Min0,
+            HalfHour::Hour4Min0 => Self::Hour3Min30,
+            HalfHour::Hour4Min30 => Self::Hour4Min0,
+            HalfHour::Hour5Min0 => Self::Hour4Min30,
+            HalfHour::Hour5Min30 => Self::Hour5Min0,
+            HalfHour::Hour6Min0 => Self::Hour5Min30,
+            HalfHour::Hour6Min30 => Self::Hour6Min0,
+            HalfHour::Hour7Min0 => Self::Hour6Min30,
+            HalfHour::Hour7Min30 => Self::Hour7Min0,
+            HalfHour::Hour8Min0 => Self::Hour7Min30,
+            HalfHour::Hour8Min30 => Self::Hour8Min0,
+            HalfHour::Hour9Min0 => Self::Hour8Min30,
+            HalfHour::Hour9Min30 => Self::Hour9Min0,
+            HalfHour::Hour10Min0 => Self::Hour9Min30,
+            HalfHour::Hour10Min30 => Self::Hour10Min0,
+            HalfHour::Hour11Min0 => Self::Hour10Min30,
+            HalfHour::Hour11Min30 => Self::Hour11Min0,
+            HalfHour::Hour12Min0 => Self::Hour11Min30,
+            HalfHour::Hour12Min30 => Self::Hour12Min0,
+            HalfHour::Hour13Min0 => Self::Hour12Min30,
+            HalfHour::Hour13Min30 => Self::Hour13Min0,
+            HalfHour::Hour14Min0 => Self::Hour13Min30,
+            HalfHour::Hour14Min30 => Self::Hour14Min0,
+            HalfHour::Hour15Min0 => Self::Hour14Min30,
+            HalfHour::Hour15Min30 => Self::Hour15Min0,
+            HalfHour::Hour16Min0 => Self::Hour15Min30,
+            HalfHour::Hour16Min30 => Self::Hour16Min0,
+            HalfHour::Hour17Min0 => Self::Hour16Min30,
+            HalfHour::Hour17Min30 => Self::Hour17Min0,
+            HalfHour::Hour18Min0 => Self::Hour17Min30,
+            HalfHour::Hour18Min30 => Self::Hour18Min0,
+            HalfHour::Hour19Min0 => Self::Hour18Min30,
+            HalfHour::Hour19Min30 => Self::Hour19Min0,
+            HalfHour::Hour20Min0 => Self::Hour19Min30,
+            HalfHour::Hour20Min30 => Self::Hour20Min0,
+            HalfHour::Hour21Min0 => Self::Hour20Min30,
+            HalfHour::Hour21Min30 => Self::Hour21Min0,
+            HalfHour::Hour22Min0 => Self::Hour21Min30,
+            HalfHour::Hour22Min30 => Self::Hour22Min0,
+            HalfHour::Hour23Min0 => Self::Hour22Min30,
+            HalfHour::Hour23Min30 => Self::Hour23Min0,
+        }
+    }
+    pub const fn next_half_hour(&self) -> HalfHour {
+        match self {
+            HalfHour::Hour0Min0 => Self::Hour0Min30,
+            HalfHour::Hour0Min30 => Self::Hour1Min0,
+            HalfHour::Hour1Min0 => Self::Hour1Min30,
+            HalfHour::Hour1Min30 => Self::Hour2Min0,
+            HalfHour::Hour2Min0 => Self::Hour2Min30,
+            HalfHour::Hour2Min30 => Self::Hour3Min0,
+            HalfHour::Hour3Min0 => Self::Hour3Min30,
+            HalfHour::Hour3Min30 => Self::Hour4Min0,
+            HalfHour::Hour4Min0 => Self::Hour4Min30,
+            HalfHour::Hour4Min30 => Self::Hour5Min0,
+            HalfHour::Hour5Min0 => Self::Hour5Min30,
+            HalfHour::Hour5Min30 => Self::Hour6Min0,
+            HalfHour::Hour6Min0 => Self::Hour6Min30,
+            HalfHour::Hour6Min30 => Self::Hour7Min0,
+            HalfHour::Hour7Min0 => Self::Hour7Min30,
+            HalfHour::Hour7Min30 => Self::Hour8Min0,
+            HalfHour::Hour8Min0 => Self::Hour8Min30,
+            HalfHour::Hour8Min30 => Self::Hour9Min0,
+            HalfHour::Hour9Min0 => Self::Hour9Min30,
+            HalfHour::Hour9Min30 => Self::Hour10Min0,
+            HalfHour::Hour10Min0 => Self::Hour10Min30,
+            HalfHour::Hour10Min30 => Self::Hour11Min0,
+            HalfHour::Hour11Min0 => Self::Hour11Min30,
+            HalfHour::Hour11Min30 => Self::Hour12Min0,
+            HalfHour::Hour12Min0 => Self::Hour12Min30,
+            HalfHour::Hour12Min30 => Self::Hour13Min0,
+            HalfHour::Hour13Min0 => Self::Hour13Min30,
+            HalfHour::Hour13Min30 => Self::Hour14Min0,
+            HalfHour::Hour14Min0 => Self::Hour14Min30,
+            HalfHour::Hour14Min30 => Self::Hour15Min0,
+            HalfHour::Hour15Min0 => Self::Hour15Min30,
+            HalfHour::Hour15Min30 => Self::Hour16Min0,
+            HalfHour::Hour16Min0 => Self::Hour16Min30,
+            HalfHour::Hour16Min30 => Self::Hour17Min0,
+            HalfHour::Hour17Min0 => Self::Hour17Min30,
+            HalfHour::Hour17Min30 => Self::Hour18Min0,
+            HalfHour::Hour18Min0 => Self::Hour18Min30,
+            HalfHour::Hour18Min30 => Self::Hour19Min0,
+            HalfHour::Hour19Min0 => Self::Hour19Min30,
+            HalfHour::Hour19Min30 => Self::Hour20Min0,
+            HalfHour::Hour20Min0 => Self::Hour20Min30,
+            HalfHour::Hour20Min30 => Self::Hour21Min0,
+            HalfHour::Hour21Min0 => Self::Hour21Min30,
+            HalfHour::Hour21Min30 => Self::Hour22Min0,
+            HalfHour::Hour22Min0 => Self::Hour22Min30,
+            HalfHour::Hour22Min30 => Self::Hour23Min0,
+            HalfHour::Hour23Min0 => Self::Hour23Min30,
+            HalfHour::Hour23Min30 => Self::Hour0Min0,
+        }
+    }
+}
+
+impl From<HalfHour> for chrono::NaiveTime {
+    fn from(value: HalfHour) -> Self {
+        match value {
+            HalfHour::Hour0Min0 => chrono::NaiveTime::from_hms_opt(0, 0, 0),
+            HalfHour::Hour0Min30 => chrono::NaiveTime::from_hms_opt(0, 30, 0),
+            HalfHour::Hour1Min0 => chrono::NaiveTime::from_hms_opt(1, 0, 0),
+            HalfHour::Hour1Min30 => chrono::NaiveTime::from_hms_opt(1, 30, 0),
+            HalfHour::Hour2Min0 => chrono::NaiveTime::from_hms_opt(2, 0, 0),
+            HalfHour::Hour2Min30 => chrono::NaiveTime::from_hms_opt(2, 30, 0),
+            HalfHour::Hour3Min0 => chrono::NaiveTime::from_hms_opt(3, 0, 0),
+            HalfHour::Hour3Min30 => chrono::NaiveTime::from_hms_opt(3, 30, 0),
+            HalfHour::Hour4Min0 => chrono::NaiveTime::from_hms_opt(4, 0, 0),
+            HalfHour::Hour4Min30 => chrono::NaiveTime::from_hms_opt(4, 30, 0),
+            HalfHour::Hour5Min0 => chrono::NaiveTime::from_hms_opt(5, 0, 0),
+            HalfHour::Hour5Min30 => chrono::NaiveTime::from_hms_opt(5, 30, 0),
+            HalfHour::Hour6Min0 => chrono::NaiveTime::from_hms_opt(6, 0, 0),
+            HalfHour::Hour6Min30 => chrono::NaiveTime::from_hms_opt(6, 30, 0),
+            HalfHour::Hour7Min0 => chrono::NaiveTime::from_hms_opt(7, 0, 0),
+            HalfHour::Hour7Min30 => chrono::NaiveTime::from_hms_opt(7, 30, 0),
+            HalfHour::Hour8Min0 => chrono::NaiveTime::from_hms_opt(8, 0, 0),
+            HalfHour::Hour8Min30 => chrono::NaiveTime::from_hms_opt(8, 30, 0),
+            HalfHour::Hour9Min0 => chrono::NaiveTime::from_hms_opt(9, 0, 0),
+            HalfHour::Hour9Min30 => chrono::NaiveTime::from_hms_opt(9, 30, 0),
+            HalfHour::Hour10Min0 => chrono::NaiveTime::from_hms_opt(10, 0, 0),
+            HalfHour::Hour10Min30 => chrono::NaiveTime::from_hms_opt(10, 30, 0),
+            HalfHour::Hour11Min0 => chrono::NaiveTime::from_hms_opt(11, 0, 0),
+            HalfHour::Hour11Min30 => chrono::NaiveTime::from_hms_opt(11, 30, 0),
+            HalfHour::Hour12Min0 => chrono::NaiveTime::from_hms_opt(12, 0, 0),
+            HalfHour::Hour12Min30 => chrono::NaiveTime::from_hms_opt(12, 30, 0),
+            HalfHour::Hour13Min0 => chrono::NaiveTime::from_hms_opt(13, 0, 0),
+            HalfHour::Hour13Min30 => chrono::NaiveTime::from_hms_opt(13, 30, 0),
+            HalfHour::Hour14Min0 => chrono::NaiveTime::from_hms_opt(14, 0, 0),
+            HalfHour::Hour14Min30 => chrono::NaiveTime::from_hms_opt(14, 30, 0),
+            HalfHour::Hour15Min0 => chrono::NaiveTime::from_hms_opt(15, 0, 0),
+            HalfHour::Hour15Min30 => chrono::NaiveTime::from_hms_opt(15, 30, 0),
+            HalfHour::Hour16Min0 => chrono::NaiveTime::from_hms_opt(16, 0, 0),
+            HalfHour::Hour16Min30 => chrono::NaiveTime::from_hms_opt(16, 30, 0),
+            HalfHour::Hour17Min0 => chrono::NaiveTime::from_hms_opt(17, 0, 0),
+            HalfHour::Hour17Min30 => chrono::NaiveTime::from_hms_opt(17, 30, 0),
+            HalfHour::Hour18Min0 => chrono::NaiveTime::from_hms_opt(18, 0, 0),
+            HalfHour::Hour18Min30 => chrono::NaiveTime::from_hms_opt(18, 30, 0),
+            HalfHour::Hour19Min0 => chrono::NaiveTime::from_hms_opt(19, 0, 0),
+            HalfHour::Hour19Min30 => chrono::NaiveTime::from_hms_opt(19, 30, 0),
+            HalfHour::Hour20Min0 => chrono::NaiveTime::from_hms_opt(20, 0, 0),
+            HalfHour::Hour20Min30 => chrono::NaiveTime::from_hms_opt(20, 30, 0),
+            HalfHour::Hour21Min0 => chrono::NaiveTime::from_hms_opt(21, 0, 0),
+            HalfHour::Hour21Min30 => chrono::NaiveTime::from_hms_opt(21, 30, 0),
+            HalfHour::Hour22Min0 => chrono::NaiveTime::from_hms_opt(22, 0, 0),
+            HalfHour::Hour22Min30 => chrono::NaiveTime::from_hms_opt(22, 30, 0),
+            HalfHour::Hour23Min0 => chrono::NaiveTime::from_hms_opt(23, 0, 0),
+            HalfHour::Hour23Min30 => chrono::NaiveTime::from_hms_opt(23, 30, 0),
+        }
+        .unwrap()
+    }
+}
+
+impl std::iter::Step for HalfHour {
+    fn steps_between(start: &Self, end: &Self) -> (usize, Option<usize>) {
+        let mut steps = 0usize;
+        let mut start = *start;
+        while start != *end {
+            steps += 1;
+            start = start.next_half_hour();
+        }
+
+        (steps, Some(steps))
+    }
+
+    fn forward_checked(mut start: Self, count: usize) -> Option<Self> {
+        for _ in 0..count {
+            start = start.next_half_hour();
+        }
+        Some(start)
+    }
+
+    fn backward_checked(mut start: Self, count: usize) -> Option<Self> {
+        for _ in 0..count {
+            start = start.previous_half_hour();
+        }
+        Some(start)
+    }
+}
+
+impl Display for HalfHour {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(match self {
+            HalfHour::Hour0Min0 => "00:00",
+            HalfHour::Hour0Min30 => "00:30",
+            HalfHour::Hour1Min0 => "01:00",
+            HalfHour::Hour1Min30 => "01:30",
+            HalfHour::Hour2Min0 => "02:00",
+            HalfHour::Hour2Min30 => "02:30",
+            HalfHour::Hour3Min0 => "03:00",
+            HalfHour::Hour3Min30 => "03:30",
+            HalfHour::Hour4Min0 => "04:00",
+            HalfHour::Hour4Min30 => "04:30",
+            HalfHour::Hour5Min0 => "05:00",
+            HalfHour::Hour5Min30 => "05:30",
+            HalfHour::Hour6Min0 => "06:00",
+            HalfHour::Hour6Min30 => "06:30",
+            HalfHour::Hour7Min0 => "07:00",
+            HalfHour::Hour7Min30 => "07:30",
+            HalfHour::Hour8Min0 => "08:00",
+            HalfHour::Hour8Min30 => "08:30",
+            HalfHour::Hour9Min0 => "09:00",
+            HalfHour::Hour9Min30 => "09:30",
+            HalfHour::Hour10Min0 => "10:00",
+            HalfHour::Hour10Min30 => "10:30",
+            HalfHour::Hour11Min0 => "11:00",
+            HalfHour::Hour11Min30 => "11:30",
+            HalfHour::Hour12Min0 => "12:00",
+            HalfHour::Hour12Min30 => "12:30",
+            HalfHour::Hour13Min0 => "13:00",
+            HalfHour::Hour13Min30 => "13:30",
+            HalfHour::Hour14Min0 => "14:00",
+            HalfHour::Hour14Min30 => "14:30",
+            HalfHour::Hour15Min0 => "15:00",
+            HalfHour::Hour15Min30 => "15:30",
+            HalfHour::Hour16Min0 => "16:00",
+            HalfHour::Hour16Min30 => "16:30",
+            HalfHour::Hour17Min0 => "17:00",
+            HalfHour::Hour17Min30 => "17:30",
+            HalfHour::Hour18Min0 => "18:00",
+            HalfHour::Hour18Min30 => "18:30",
+            HalfHour::Hour19Min0 => "19:00",
+            HalfHour::Hour19Min30 => "19:30",
+            HalfHour::Hour20Min0 => "20:00",
+            HalfHour::Hour20Min30 => "20:30",
+            HalfHour::Hour21Min0 => "21:00",
+            HalfHour::Hour21Min30 => "21:30",
+            HalfHour::Hour22Min0 => "22:00",
+            HalfHour::Hour22Min30 => "22:30",
+            HalfHour::Hour23Min0 => "23:00",
+            HalfHour::Hour23Min30 => "23:30",
+        })
+    }
+}
+
+impl Iterator for HalfHour {
+    type Item = HalfHour;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        Some(self.next_half_hour())
+    }
+}
+
+impl From<NaiveTime> for HalfHour {
+    fn from(time: NaiveTime) -> Self {
+        let minute = time.minute();
+        macro_rules! match_hour_minute {
+			($($hour:literal: $min0:ident, $min30:ident;)*) => {
+				match time.hour().min(23) {
+					$(
+						$hour => if minute < 30{
+							HalfHour::$min0
+						} else {
+							HalfHour::$min30
+						}
+					)*
+					hour => unreachable!("got hour {hour}")
+				}
+			};
+		}
+        match_hour_minute!(
+            0: Hour0Min0, Hour0Min30;
+            1: Hour1Min0, Hour1Min30;
+            2: Hour2Min0, Hour2Min30;
+            3: Hour3Min0, Hour3Min30;
+            4: Hour4Min0, Hour4Min30;
+            5: Hour5Min0, Hour5Min30;
+            6: Hour6Min0, Hour6Min30;
+            7: Hour7Min0, Hour7Min30;
+            8: Hour8Min0, Hour8Min30;
+            9: Hour9Min0, Hour9Min30;
+            10: Hour10Min0, Hour10Min30;
+            11: Hour11Min0, Hour11Min30;
+            12: Hour12Min0, Hour12Min30;
+            13: Hour13Min0, Hour13Min30;
+            14: Hour14Min0, Hour14Min30;
+            15: Hour15Min0, Hour15Min30;
+            16: Hour16Min0, Hour16Min30;
+            17: Hour17Min0, Hour17Min30;
+            18: Hour18Min0, Hour18Min30;
+            19: Hour19Min0, Hour19Min30;
+            20: Hour20Min0, Hour20Min30;
+            21: Hour21Min0, Hour21Min30;
+            22: Hour22Min0, Hour22Min30;
+            23: Hour23Min0, Hour23Min30;
+        )
+    }
+}
+
+#[macro_export]
+macro_rules! id_impl {
+    ($name:ident) => {
+        #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, serde::Serialize, serde::Deserialize)]
+        pub struct $name(uuid::Uuid);
+
+        #[cfg(feature = "server")]
+        impl sqlx::TypeInfo for $name {
+            fn is_null(&self) -> bool {
+                self.0 == uuid::Uuid::nil()
+            }
+
+            fn name(&self) -> &str {
+                "uuid"
+            }
+        }
+
+        #[cfg(feature = "server")]
+        impl sqlx::Type<sqlx::Postgres> for $name {
+            fn type_info() -> <sqlx::Postgres as sqlx::Database>::TypeInfo {
+                <uuid::Uuid as sqlx::Type<sqlx::Postgres>>::type_info()
+            }
+        }
+
+        #[cfg(feature = "server")]
+        impl<'q> sqlx::Encode<'q, sqlx::Postgres> for $name {
+            fn encode_by_ref(
+                &self,
+                buf: &mut <sqlx::Postgres as sqlx::Database>::ArgumentBuffer<'q>,
+            ) -> Result<sqlx::encode::IsNull, sqlx::error::BoxDynError> {
+                self.0.encode_by_ref(buf)
+            }
+        }
+
+        #[cfg(feature = "server")]
+        impl<'r> sqlx::Decode<'r, sqlx::Postgres> for $name {
+            fn decode(
+                value: <sqlx::Postgres as sqlx::Database>::ValueRef<'r>,
+            ) -> Result<Self, sqlx::error::BoxDynError> {
+                Ok(Self(uuid::Uuid::decode(value)?))
+            }
+        }
+
+        impl From<uuid::Uuid> for $name {
+            fn from(value: uuid::Uuid) -> Self {
+                Self::from_uuid(value)
+            }
+        }
+
+        impl From<$name> for uuid::Uuid {
+            fn from(value: $name) -> Self {
+                value.into_uuid()
+            }
+        }
+
+        impl Default for $name {
+            fn default() -> Self {
+                Self::new()
+            }
+        }
+
+        impl $name {
+            pub fn new() -> Self {
+                Self(uuid::Uuid::new_v4())
+            }
+
+            pub const fn from_uuid(uuid: uuid::Uuid) -> Self {
+                Self(uuid)
+            }
+
+            pub const fn into_uuid(self) -> uuid::Uuid {
+                self.0
+            }
+        }
+
+        impl core::fmt::Display for $name {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                self.0.fmt(f)
+            }
+        }
+
+        impl core::str::FromStr for $name {
+            type Err = uuid::Error;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                Ok(Self(uuid::Uuid::from_str(s)?))
+            }
+        }
+    };
+}
diff --git a/plan-proto/src/limited.rs b/plan-proto/src/limited.rs
new file mode 100644
index 0000000..5b90efe
--- /dev/null
+++ b/plan-proto/src/limited.rs
@@ -0,0 +1,129 @@
+use core::{
+    fmt::Display,
+    ops::{Deref, RangeInclusive},
+};
+
+use serde::{Deserialize, Deserializer, Serialize};
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct FixedLenString<const LEN: usize>(String);
+
+impl<const LEN: usize> Display for FixedLenString<LEN> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<const LEN: usize> FixedLenString<LEN> {
+    pub fn new(s: String) -> Option<Self> {
+        (s.chars().take(LEN + 1).count() == LEN).then_some(Self(s))
+    }
+}
+
+impl<const LEN: usize> Deref for FixedLenString<LEN> {
+    type Target = String;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<'de, const LEN: usize> Deserialize<'de> for FixedLenString<LEN> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ExpectedLen(usize);
+        impl serde::de::Expected for ExpectedLen {
+            fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+                write!(f, "a string exactly {} characters long", self.0)
+            }
+        }
+        <String as Deserialize>::deserialize(deserializer).and_then(|s| {
+            let char_count = s.chars().take(LEN.saturating_add(1)).count();
+            if char_count != LEN {
+                Err(serde::de::Error::invalid_length(
+                    char_count,
+                    &ExpectedLen(LEN),
+                ))
+            } else {
+                Ok(Self(s))
+            }
+        })
+    }
+}
+
+impl<const LEN: usize> Serialize for FixedLenString<LEN> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self.0.as_str())
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ClampedString<const MIN: usize, const MAX: usize>(String);
+
+impl<const MIN: usize, const MAX: usize> ClampedString<MIN, MAX> {
+    pub fn new(s: String) -> Result<Self, RangeInclusive<usize>> {
+        let str_len = s.chars().take(MAX.saturating_add(1)).count();
+        (str_len >= MIN && str_len <= MAX)
+            .then_some(Self(s))
+            .ok_or(MIN..=MAX)
+    }
+
+    pub fn into_inner(self) -> String {
+        self.0
+    }
+}
+
+impl<const MIN: usize, const MAX: usize> Display for ClampedString<MIN, MAX> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<const MIN: usize, const MAX: usize> Deref for ClampedString<MIN, MAX> {
+    type Target = String;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<'de, const MIN: usize, const MAX: usize> Deserialize<'de> for ClampedString<MIN, MAX> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct ExpectedLen(usize, usize);
+        impl serde::de::Expected for ExpectedLen {
+            fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+                write!(
+                    f,
+                    "a string between {} and {} characters long",
+                    self.0, self.1
+                )
+            }
+        }
+        <String as Deserialize>::deserialize(deserializer).and_then(|s| {
+            let char_count = s.chars().take(MAX.saturating_add(1)).count();
+            if char_count < MIN || char_count > MAX {
+                Err(serde::de::Error::invalid_length(
+                    char_count,
+                    &ExpectedLen(MIN, MAX),
+                ))
+            } else {
+                Ok(Self(s))
+            }
+        })
+    }
+}
+
+impl<const MIN: usize, const MAX: usize> Serialize for ClampedString<MIN, MAX> {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serializer.serialize_str(self.0.as_str())
+    }
+}
diff --git a/plan-proto/src/message.rs b/plan-proto/src/message.rs
new file mode 100644
index 0000000..39ee77a
--- /dev/null
+++ b/plan-proto/src/message.rs
@@ -0,0 +1,23 @@
+use core::ops::Deref;
+
+use serde::{Deserialize, Deserializer, Serialize};
+
+use crate::{
+    HalfHour,
+    error::ServerError,
+    plan::{Plan, PlanDay, UpdateTiles},
+};
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum ServerMessage {
+    Error(ServerError),
+    DayUpdate { offset: u8, day: PlanDay },
+    PlanInfo(Plan),
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum ClientMessage {
+    MarkTile { day_offset: u8, tile: HalfHour },
+    UnmarkTile { day_offset: u8, tile: HalfHour },
+    GetPlan,
+}
diff --git a/plan-proto/src/plan.rs b/plan-proto/src/plan.rs
new file mode 100644
index 0000000..77c6f78
--- /dev/null
+++ b/plan-proto/src/plan.rs
@@ -0,0 +1,96 @@
+use core::num::NonZeroU8;
+use std::collections::HashMap;
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use thiserror::Error;
+
+use crate::{HalfHour, limited::ClampedString};
+
+#[derive(Debug, Clone, Copy, PartialEq, Error)]
+pub enum PlanError {
+    #[error("start after end")]
+    StartAfterEnd,
+    #[error("day 0 ends before the plan starts")]
+    Day0EndsBeforePlanStarts,
+}
+
+crate::id_impl!(PlanId);
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct CreatePlan {
+    pub start_time: DateTime<Utc>,
+    pub title: Option<ClampedString<1, 0x40>>,
+    pub days: HashMap<u8, CreatePlanDay>,
+}
+impl CreatePlan {
+    pub fn check(&self) -> Result<(), PlanError> {
+        let start_half_hour: HalfHour = self.start_time.time().into();
+
+        if let Some(day0) = self.days.get(&0u8)
+            && day0.day_end < start_half_hour
+        {
+            return Err(PlanError::Day0EndsBeforePlanStarts);
+        }
+        self.days.values().try_for_each(|v| v.check())?;
+
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct CreatePlanDay {
+    pub day_start: HalfHour,
+    pub day_end: HalfHour,
+}
+
+impl CreatePlanDay {
+    pub fn check(&self) -> Result<(), PlanError> {
+        if self.day_start > self.day_end {
+            return Err(PlanError::StartAfterEnd);
+        }
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Plan {
+    pub created_by: String,
+    pub title: Option<String>,
+    pub start_time: DateTime<Utc>,
+    pub days: HashMap<u8, PlanDay>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct PlanDay {
+    pub day_start: HalfHour,
+    pub day_end: HalfHour,
+    pub tiles_count: HashMap<HalfHour, NonZeroU8>,
+    pub your_tiles: Box<[HalfHour]>,
+    pub users_available: Box<[LastUpdatedAvailability]>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct LastUpdatedAvailability {
+    pub username: String,
+    pub last_updated_availability: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct UpdateTiles {
+    pub day_offset: u8,
+    pub tiles: Box<[HalfHour]>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct PlanHeadline {
+    pub id: PlanId,
+    pub title: Option<String>,
+    pub date: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct UserPlans {
+    pub created_plans: Box<[PlanHeadline]>,
+    pub participating_in: Box<[PlanHeadline]>,
+}
diff --git a/plan-proto/src/token.rs b/plan-proto/src/token.rs
new file mode 100644
index 0000000..0f32b72
--- /dev/null
+++ b/plan-proto/src/token.rs
@@ -0,0 +1,40 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+use crate::{limited::FixedLenString, user::Username};
+
+pub const TOKEN_LEN: usize = 0x20;
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct Token {
+    pub token: FixedLenString<TOKEN_LEN>,
+    pub username: Username,
+    pub created_at: DateTime<Utc>,
+    pub expires_at: DateTime<Utc>,
+}
+
+impl Token {
+    pub fn login_token(&self) -> TokenLogin {
+        TokenLogin(self.token.clone())
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct TokenLogin(pub FixedLenString<TOKEN_LEN>);
+
+#[cfg(feature = "server")]
+impl axum_extra::headers::authorization::Credentials for TokenLogin {
+    const SCHEME: &'static str = "Bearer";
+
+    fn decode(value: &axum::http::HeaderValue) -> Option<Self> {
+        value
+            .to_str()
+            .ok()
+            .and_then(|v| FixedLenString::new(v.strip_prefix("Bearer ").unwrap_or(v).to_string()))
+            .map(Self)
+    }
+
+    fn encode(&self) -> axum::http::HeaderValue {
+        axum::http::HeaderValue::from_str(self.0.as_str()).expect("bearer token encode")
+    }
+}
diff --git a/plan-proto/src/user.rs b/plan-proto/src/user.rs
new file mode 100644
index 0000000..f7d2c79
--- /dev/null
+++ b/plan-proto/src/user.rs
@@ -0,0 +1,14 @@
+use serde::{Deserialize, Serialize};
+
+use crate::limited::ClampedString;
+
+pub type Username = ClampedString<1, 0x40>;
+pub type Password = ClampedString<6, 0x100>;
+
+#[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
+pub struct UserLogin {
+    pub username: Username,
+    pub password: Password,
+}
+
+crate::id_impl!(UserId);
diff --git a/plan-server/Cargo.toml b/plan-server/Cargo.toml
new file mode 100644
index 0000000..aa943eb
--- /dev/null
+++ b/plan-server/Cargo.toml
@@ -0,0 +1,44 @@
+[package]
+name = "plan-server"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+axum = { version = "0.8", features = ["ws", "macros"] }
+tokio = { version = "1.47", features = ["full"] }
+log = { version = "0.4" }
+pretty_env_logger = { version = "0.5" }
+futures = "0.3.31"
+anyhow = { version = "1" }
+mime-sniffer = { version = "0.1" }
+chrono = { version = "0.4" }
+axum-extra = { version = "0.10", features = ["typed-header"] }
+rand = { version = "0.9" }
+serde_json = { version = "1.0" }
+serde = { version = "1.0", features = ["derive"] }
+thiserror = { version = "2" }
+ciborium = { version = "0.2" }
+colored = { version = "3.0" }
+plan-macros = { path = "../plan-macros" }
+plan-proto = { path = "../plan-proto", features = ["server"] }
+uuid = { version = "1.18", features = ["v4"] }
+sqlx = { version = "0.8", features = [
+	"runtime-tokio",
+	"postgres",
+	"derive",
+	"macros",
+	"uuid",
+	"chrono",
+] }
+argon2 = { version = "0.5" }
+tower-http = { version = "0.6", features = ["cors"] }
+tower = { version = "0.5.2", features = [
+	"limit",
+	"tokio",
+	"tokio-stream",
+	"tokio-util",
+	"tracing",
+	"buffer",
+	"timeout",
+] }
+axum-limit = "0.1.0-alpha.2"
diff --git a/plan-server/build.rs b/plan-server/build.rs
new file mode 100644
index 0000000..6afcdf4
--- /dev/null
+++ b/plan-server/build.rs
@@ -0,0 +1,129 @@
+#![feature(unix_send_signal)]
+use core::time::Duration;
+use std::{
+    io::Read,
+    os::unix::process::ChildExt,
+    path::Path,
+    process::{ChildStdout, Command, ExitStatus, Stdio},
+    thread::sleep,
+    time::Instant,
+};
+
+fn main() {
+    // add_from_dir("../");
+    return;
+    let server_path = std::env::current_dir().unwrap_or_else(|_| {
+        std::env::var("CARGO_MANIFEST_DIR")
+            .expect("CARGO_MANIFEST_DIR")
+            .into()
+    });
+    unsafe {
+        std::env::set_var(
+            "CARGO_TARGET_DIR",
+            server_path
+                .parent()
+                .unwrap()
+                .join("target-server")
+                .to_str()
+                .unwrap(),
+        )
+    };
+    let web_path = server_path.parent().expect("no parent").join("calendar");
+    add_from_dir(&web_path);
+    build_calendar(&web_path);
+}
+
+fn build_calendar(web_path: &Path) {
+    let mut cmd = Command::new("trunk");
+    let target_dir = web_path.parent().unwrap().join("target-calendar");
+    cmd.current_dir(web_path)
+        // .env_clear()
+        // .env("PATH", std::env::var("PATH").unwrap_or_default())
+        .arg("build")
+        .arg("--release")
+        .arg("--color")
+        .arg("never")
+        .arg("--verbose")
+        .env("CARGO_TARGET_DIR", target_dir.to_str().unwrap())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .stdin(Stdio::null());
+    let mut child = cmd.spawn().unwrap();
+
+    let start = Instant::now();
+    let status = loop {
+        if let Some(status) = child.try_wait().unwrap() {
+            break Some(status);
+        }
+        if (Instant::now() - start) > Duration::from_secs(30) {
+            eprintln!("build_calendar timed out");
+            if let Err(err) = child.send_signal(9) {
+                panic!("killing build_calendar build: {err}");
+            }
+            // panic!("a");
+            break None;
+        }
+        sleep(Duration::from_millis(100));
+    };
+    let status_code = status.and_then(|status| status.code()).unwrap_or(!0u8 as _);
+
+    if status_code != 0 {
+        eprintln!("trunk build status code: {status_code}");
+        // // if let Some(mut stdout) = child.stdout.take() {
+        // //     // let mut buf = vec![];
+        // //     let mut buf = [0u8; 1];
+        // //     let mut cnt = 0usize;
+        // //     while let Ok(len) = stdout.read(&mut buf) {
+        // //         if cnt == 2269 {
+        // //             panic!("A");
+        // //         }
+        // //         if len == 0 {
+        // //             break;
+        // //         } else {
+        // //             eprint!("{}", buf[0] as char);
+        // //             cnt += 1;
+        // //         }
+        // //     }
+        // //     // panic!("a");
+        // //     // stdout.read_to_end(&mut buf).unwrap();
+        // //     // eprintln!("trunk build stdout: {}", String::from_utf8(buf).unwrap());
+        // // }
+        // if let Some(mut stderr) = child.stderr.take() {
+        //     // let mut buf = vec![];
+        //     // stderr.read_to_end(&mut buf).unwrap();
+        //     let mut buf = [0u8; 1];
+        //     let mut cnt = 0usize;
+        //     while let Ok(len) = stderr.read(&mut buf) {
+        //         if len == 0 {
+        //             break;
+        //         } else {
+        //             eprint!("{}", buf[0] as char);
+        //             cnt += 1;
+        //         }
+        //         if cnt == 50 {
+        //             panic!("A");
+        //         }
+        //     }
+        //     panic!("a");
+        //     // eprintln!("trunk build stderr: {}", String::from_utf8(buf).unwrap());
+        // }
+        eprintln!("calendar build failed");
+    }
+}
+
+#[allow(unused)]
+fn add_from_dir(dir: &Path) {
+    for item in std::fs::read_dir(dir)
+        .unwrap_or_else(|err| panic!("could not read calendar source directory ({dir:?}): {err}"))
+    {
+        let item = item.unwrap_or_else(|err| panic!("item in {dir:?} source directory: {err}"));
+        if let Some(file_name) = item.file_name().to_str()
+            && file_name.ends_with(".rs")
+        {
+            let path = dir.join(file_name);
+            println!("cargo:rerun-if-changed={}", path.to_str().unwrap());
+        } else if item.file_type().map(|t| t.is_dir()).unwrap_or_default() {
+            add_from_dir(&item.path());
+        }
+    }
+}
diff --git a/plan-server/src/db.rs b/plan-server/src/db.rs
new file mode 100644
index 0000000..1892992
--- /dev/null
+++ b/plan-server/src/db.rs
@@ -0,0 +1,40 @@
+pub mod plan;
+pub mod user;
+use plan_proto::error::DatabaseError;
+use sqlx::{Pool, Postgres};
+
+use crate::db::{plan::PlanDatabase, user::UserDatabase};
+
+type Result<T> = core::result::Result<T, DatabaseError>;
+
+#[derive(Debug, Clone)]
+pub struct Database {
+    pool: Pool<Postgres>,
+}
+
+impl Database {
+    pub const fn new(pool: Pool<Postgres>) -> Self {
+        Self { pool }
+    }
+
+    pub fn user(&self) -> UserDatabase {
+        UserDatabase {
+            pool: self.pool.clone(),
+        }
+    }
+
+    pub fn plan(&self) -> PlanDatabase {
+        PlanDatabase {
+            pool: self.pool.clone(),
+        }
+    }
+
+    pub async fn migrate(&self) {
+        log::info!("running migrations");
+        sqlx::migrate!("../migrations")
+            .run(&self.pool)
+            .await
+            .expect("run migrations");
+        log::info!("migrations done");
+    }
+}
diff --git a/plan-server/src/db/plan.rs b/plan-server/src/db/plan.rs
new file mode 100644
index 0000000..9981c04
--- /dev/null
+++ b/plan-server/src/db/plan.rs
@@ -0,0 +1,399 @@
+use core::num::NonZeroU8;
+use std::collections::HashMap;
+
+use chrono::{DateTime, Utc};
+use plan_proto::{
+    HalfHour,
+    error::{DatabaseError, ServerError},
+    plan::{CreatePlan, LastUpdatedAvailability, Plan, PlanDay, PlanHeadline, PlanId, UpdateTiles},
+    user::UserId,
+};
+use sqlx::{Pool, Postgres, query, query_as};
+use uuid::Uuid;
+
+type Result<T> = core::result::Result<T, ServerError>;
+
+#[derive(Debug, Clone)]
+pub struct PlanDatabase {
+    pub(super) pool: Pool<Postgres>,
+}
+
+pub enum TileOperation {
+    Mark,
+    Unmark,
+}
+
+impl PlanDatabase {
+    pub async fn get_participating_plans(&self, user_id: UserId) -> Result<Box<[PlanHeadline]>> {
+        Ok(query_as!(
+            PlanHeadline,
+            r#" select
+					p.id, p.title, p.start_time as "date"
+				from
+					plans p
+				join
+					(
+						select 
+							d.plan_id, max(t.updated_at) as last_modified
+						from
+							day_tiles t
+						join
+							plan_days d on t.day_id = d.id
+						join
+							plans p on p.id = d.plan_id
+						where
+							p.created_by != $1
+							and
+							t.user_id = $1
+						group by
+							d.plan_id
+					) participated on participated.plan_id = p.id
+				order by
+					participated.last_modified desc"#,
+            user_id.into_uuid(),
+        )
+        .fetch_all(&self.pool)
+        .await?
+        .into_boxed_slice())
+    }
+    pub async fn get_user_plans(&self, user: UserId) -> Result<Box<[PlanHeadline]>> {
+        Ok(query_as!(
+            PlanHeadline,
+            r#" select
+					id, title, start_time as "date"
+				from
+					plans
+				where
+					created_by = $1
+				order by
+					created_at desc"#,
+            user.into_uuid(),
+        )
+        .fetch_all(&self.pool)
+        .await?
+        .into_boxed_slice())
+    }
+
+    pub async fn create_plan(&self, creator: UserId, create: CreatePlan) -> Result<PlanId> {
+        create.check()?;
+        let mut tx = self.pool.begin().await?;
+        let created_at = Utc::now();
+        let plan_id = PlanId::from_uuid(
+            query!(
+                r#" insert into plans
+					(title, created_by, start_time, created_at, updated_at)
+				values
+					($1, $2, $3, $4, $5)
+				returning id"#,
+                create.title.map(|t| t.into_inner()),
+                creator.into_uuid(),
+                create.start_time,
+                created_at,
+                created_at,
+            )
+            .fetch_one(&mut *tx)
+            .await?
+            .id,
+        );
+        for (day_offset, day) in &create.days {
+            query!(
+                r#" insert into plan_days
+					(plan_id, day_offset, day_start, day_end)
+				values
+					($1, $2, $3, $4)"#,
+                plan_id.into_uuid(),
+                (*day_offset) as i16,
+                day.day_start as _,
+                day.day_end as _,
+            )
+            .execute(&mut *tx)
+            .await?;
+        }
+
+        tx.commit().await?;
+        Ok(plan_id)
+    }
+
+    pub async fn mark_day_tile(
+        &self,
+        id: PlanId,
+        user_id: UserId,
+        day_offset: u8,
+        tile: HalfHour,
+        operation: TileOperation,
+    ) -> Result<()> {
+        let day_id = query!(
+            "select id from plan_days where plan_id = $1 and day_offset = $2",
+            id.into_uuid(),
+            day_offset as i16,
+        )
+        .fetch_one(&self.pool)
+        .await?;
+
+        let mut tx = self.pool.begin().await?;
+        let mut current_tiles = match sqlx::query!(
+            r#" select
+					tiles as "tiles: Vec<HalfHour>"
+				from
+					day_tiles
+				where
+					day_id = $1
+					and
+					user_id = $2"#,
+            day_id.id,
+            user_id.into_uuid(),
+        )
+        .fetch_one(&mut *tx)
+        .await
+        .map_err(Into::<ServerError>::into)
+        {
+            Ok(tiles) => tiles.tiles,
+            Err(ServerError::NotFound) => Vec::new(),
+            Err(err) => return Err(err),
+        };
+        match operation {
+            TileOperation::Mark => {
+                if !current_tiles.contains(&tile) {
+                    current_tiles.push(tile);
+                }
+            }
+            TileOperation::Unmark => current_tiles.retain(|t| *t != tile),
+        }
+
+        if current_tiles.is_empty() {
+            sqlx::query!(
+                "delete from day_tiles where day_id = $1 and user_id = $2",
+                day_id.id,
+                user_id.into_uuid()
+            )
+            .execute(&mut *tx)
+            .await?;
+            tx.commit().await?;
+            return Ok(());
+        }
+
+        sqlx::query(
+            r#" insert into
+					day_tiles (day_id, user_id, tiles, updated_at)
+				values
+					($1, $2, $3, now())
+				on conflict (day_id, user_id) do update
+					set tiles = $3, updated_at = now()"#,
+        )
+        .bind(day_id.id)
+        .bind(user_id.into_uuid())
+        .bind(current_tiles)
+        .execute(&mut *tx)
+        .await?;
+
+        tx.commit().await?;
+
+        Ok(())
+    }
+
+    pub async fn update_day_tiles(
+        &self,
+        id: PlanId,
+        user_id: UserId,
+        update: UpdateTiles,
+    ) -> Result<PlanDay> {
+        let day_id = query!(
+            "select id from plan_days where plan_id = $1 and day_offset = $2",
+            id.into_uuid(),
+            update.day_offset as i16,
+        )
+        .fetch_one(&self.pool)
+        .await?;
+
+        sqlx::query(
+            r#" insert into
+					day_tiles (day_id, user_id, tiles)
+				values
+					($1, $2, $3)
+				on conflict update"#,
+        )
+        .bind(day_id.id)
+        .bind(user_id.into_uuid())
+        .bind(update.tiles.to_vec())
+        .execute(&self.pool)
+        .await?;
+
+        let day = query_as!(
+            Day,
+            r#" select
+					id, day_offset, day_start as "day_start: HalfHour", day_end as "day_end: HalfHour"
+				from
+					plan_days
+				where
+					plan_id = $1
+					and
+					day_offset = $2"#,
+            id.into_uuid(),
+            update.day_offset as i16,
+        )
+        .fetch_one(&self.pool)
+        .await?;
+
+        self.get_day_tiles(day, user_id).await
+    }
+
+    pub async fn get_day(&self, plan_id: PlanId, day_offset: u8) -> Result<Day> {
+        Ok(query_as!(
+            Day,
+            r#" select
+					id, day_offset, day_start as "day_start: HalfHour", day_end as "day_end: HalfHour"
+				from
+					plan_days
+				where
+					plan_id = $1
+					and
+					day_offset = $2"#,
+            plan_id.into_uuid(),
+            day_offset as i16,
+        )
+        .fetch_one(&self.pool)
+        .await?)
+    }
+
+    pub async fn get_day_tiles(&self, day: Day, requested_by: UserId) -> Result<PlanDay> {
+        let day_tiles = query!(
+            r#" select
+					d.tiles as "tiles: Vec<HalfHour>", d.user_id, u.username, d.updated_at
+				from
+					day_tiles d
+				join
+					users u on u.id = d.user_id
+				where
+					day_id = $1"#,
+            day.id
+        )
+        .fetch_all(&self.pool)
+        .await?;
+        let mut tiles_count: HashMap<HalfHour, std::num::NonZero<u8>> = HashMap::new();
+        for day_tile in day_tiles.iter().flat_map(|t| t.tiles.iter()) {
+            match tiles_count.get_mut(day_tile) {
+                Some(cnt) => {
+                    if let Some(next) = cnt.checked_add(1) {
+                        *cnt = next;
+                    }
+                }
+                None => {
+                    tiles_count.insert(*day_tile, NonZeroU8::new(1).unwrap());
+                }
+            }
+        }
+        let users_available = {
+            let mut users_available = day_tiles
+                .iter()
+                .map(|t| LastUpdatedAvailability {
+                    username: t.username.clone(),
+                    last_updated_availability: t.updated_at,
+                })
+                .collect::<Box<[_]>>();
+            users_available.sort_by_key(|u| u.last_updated_availability.timestamp());
+            users_available.reverse();
+            users_available
+        };
+
+        let your_tiles = day_tiles
+            .into_iter()
+            .find_map(|d| {
+                (d.user_id == requested_by.into_uuid()).then(|| d.tiles.into_boxed_slice())
+            })
+            .unwrap_or_default();
+
+        Ok(PlanDay {
+            your_tiles,
+            tiles_count,
+            users_available,
+            day_end: day.day_end,
+            day_start: day.day_start,
+        })
+    }
+
+    pub async fn day_tiles_per_user(
+        &self,
+        plan_id: PlanId,
+        day_offset: u8,
+    ) -> Result<HashMap<UserId, Box<[HalfHour]>>> {
+        let day = query!(
+            "select id from plan_days where plan_id = $1 and day_offset = $2",
+            plan_id.into_uuid(),
+            day_offset as i16,
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        let tiles = query!(
+            r#" select
+					user_id, tiles as "tiles: Vec<HalfHour>"
+				from
+					day_tiles
+				where
+					day_id = $1"#,
+            day.id,
+        )
+        .fetch_all(&self.pool)
+        .await?;
+        Ok(tiles
+            .into_iter()
+            .map(|tile| {
+                (
+                    UserId::from_uuid(tile.user_id),
+                    tile.tiles.into_boxed_slice(),
+                )
+            })
+            .collect())
+    }
+
+    pub async fn get_plan(&self, id: PlanId, requested_by: UserId) -> Result<Plan> {
+        let plan = query!(
+            r#" select
+					p.id, p.title, users.username, p.start_time
+				from
+					plans p
+				join
+					users on users.id = p.created_by
+				where
+					p.id = $1"#,
+            id.into_uuid()
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        let mut plan = Plan {
+            created_by: plan.username,
+            start_time: plan.start_time,
+            days: HashMap::new(),
+            title: plan.title,
+        };
+
+        let days = query_as!(
+            Day,
+            r#" select
+					id, day_offset, day_start as "day_start: HalfHour", day_end as "day_end: HalfHour"
+				from
+					plan_days
+				where
+					plan_id = $1"#,
+            id.into_uuid()
+        )
+        .fetch_all(&self.pool)
+        .await?;
+        for day in days {
+            let offset = day.day_offset as u8;
+            let day_id = day.id;
+            let day = self.get_day_tiles(day, requested_by).await?;
+            if let Some(dupe) = plan.days.insert(offset, day) {
+                log::warn!("duplicate day (plan id: {id}; day id: {day_id}): {dupe:?}",);
+            }
+        }
+
+        Ok(plan)
+    }
+}
+
+pub struct Day {
+    pub id: Uuid,
+    pub day_offset: i16,
+    pub day_start: HalfHour,
+    pub day_end: HalfHour,
+}
diff --git a/plan-server/src/db/user.rs b/plan-server/src/db/user.rs
new file mode 100644
index 0000000..181c7d2
--- /dev/null
+++ b/plan-server/src/db/user.rs
@@ -0,0 +1,213 @@
+use super::Result;
+use argon2::{
+    Argon2, PasswordHash, PasswordVerifier,
+    password_hash::{PasswordHasher, SaltString, rand_core::OsRng},
+};
+use chrono::{TimeDelta, Utc};
+use plan_proto::{
+    error::{DatabaseError, ServerError},
+    token,
+    user::UserId,
+};
+use rand::distr::SampleString;
+use sqlx::{Decode, Encode, Pool, Postgres, prelude::FromRow, query, query_as};
+
+#[derive(Debug, Clone)]
+pub struct UserDatabase {
+    pub(super) pool: Pool<Postgres>,
+}
+
+#[derive(Debug, Clone, FromRow)]
+pub struct LoginToken {
+    pub token: String,
+    pub user_id: UserId,
+
+    pub created_at: chrono::DateTime<Utc>,
+    pub expires_at: chrono::DateTime<Utc>,
+}
+
+impl LoginToken {
+    const TOKEN_LONGEVITY: TimeDelta = TimeDelta::days(30);
+
+    pub fn new(user_id: UserId) -> Self {
+        let created_at = Utc::now();
+        let expires_at = created_at
+            .checked_add_signed(Self::TOKEN_LONGEVITY)
+            .unwrap_or_else(|| {
+                panic!(
+                    "could not add {} time to {created_at}",
+                    Self::TOKEN_LONGEVITY
+                )
+            });
+
+        let token = rand::distr::Alphanumeric.sample_string(&mut rand::rng(), token::TOKEN_LEN);
+
+        Self {
+            token,
+            user_id,
+            created_at,
+            expires_at,
+        }
+    }
+}
+
+pub enum GetUserBy<'a> {
+    Username(&'a str),
+    Id(UserId),
+}
+
+impl UserDatabase {
+    pub async fn create(&self, username: &str, password: &str) -> Result<User> {
+        let salt = SaltString::generate(&mut OsRng);
+        let argon2 = Argon2::default();
+        let password_hash = argon2
+            .hash_password(password.as_bytes(), &salt)?
+            .to_string();
+
+        let now = chrono::offset::Utc::now();
+
+        let user = User {
+            id: UserId::new(),
+            username: username.into(),
+            password_hash,
+            created_at: now,
+            updated_at: now,
+        };
+
+        query!(
+            r#"insert into users 
+				(id, username, password_hash, created_at, updated_at) 
+			values 
+				($1, $2, $3, $4, $5)"#,
+            user.id.into_uuid(),
+            user.username,
+            user.password_hash,
+            user.created_at,
+            user.updated_at
+        )
+        .execute(&self.pool)
+        .await
+        .map_err(|err| {
+            if let sqlx::Error::Database(db_err) = &err
+                && let Some(constraint) = db_err.constraint()
+                && constraint == "users_username_unique"
+            {
+                DatabaseError::UserAlreadyExists
+            } else {
+                err.into()
+            }
+        })?;
+
+        Ok(user)
+    }
+
+    pub async fn get_user(&self, get_user_by: GetUserBy<'_>) -> Result<User> {
+        Ok(match get_user_by {
+            GetUserBy::Username(username) => {
+                query_as!(
+                    User,
+                    r#"
+					select 
+						id, username, password_hash, 
+						created_at, updated_at
+					from
+						users
+					where
+						username = $1"#,
+                    username
+                )
+                .fetch_one(&self.pool)
+                .await?
+            }
+            GetUserBy::Id(id) => {
+                query_as!(
+                    User,
+                    r#"
+					select 
+						id, username, password_hash, 
+						created_at, updated_at
+					from
+						users
+					where
+						id = $1"#,
+                    id.into_uuid()
+                )
+                .fetch_one(&self.pool)
+                .await?
+            }
+        })
+    }
+
+    pub async fn login(
+        &self,
+        username: &str,
+        password: &str,
+    ) -> core::result::Result<LoginToken, ServerError> {
+        let user = self.get_user(GetUserBy::Username(username)).await?;
+
+        let parsed_hash = PasswordHash::new(&user.password_hash).map_err(DatabaseError::from)?;
+        Argon2::default()
+            .verify_password(password.as_bytes(), &parsed_hash)
+            .map_err(|err| match err {
+                argon2::password_hash::Error::Password => ServerError::InvalidCredentials,
+                err => ServerError::DatabaseError(err.into()),
+            })?;
+
+        let token = LoginToken::new(user.id);
+
+        query!(
+            r#" insert into login_tokens
+					(token, user_id, created_at, expires_at)
+				values
+					($1, $2, $3, $4)"#,
+            token.token,
+            token.user_id.into_uuid(),
+            token.created_at,
+            token.expires_at
+        )
+        .execute(&self.pool)
+        .await
+        .map_err(Into::<DatabaseError>::into)?;
+
+        Ok(token)
+    }
+
+    pub async fn check_token(&self, token: &str) -> core::result::Result<User, ServerError> {
+        let token = query_as!(
+            LoginToken,
+            r#" select
+					token, user_id, created_at, expires_at
+				from
+					login_tokens
+				where
+					token = $1
+					and
+					expires_at > now()
+				"#,
+            token
+        )
+        .fetch_one(&self.pool)
+        .await
+        .map_err(Into::<DatabaseError>::into)
+        .map_err(|err| match err {
+            DatabaseError::NotFound => ServerError::ExpiredToken,
+            _ => err.into(),
+        })?;
+
+        if Utc::now() >= token.expires_at {
+            return Err(ServerError::ExpiredToken);
+        }
+
+        Ok(self.get_user(GetUserBy::Id(token.user_id)).await?)
+    }
+}
+
+#[derive(Debug, Clone, FromRow, Encode, Decode)]
+pub struct User {
+    pub id: UserId,
+    pub username: String,
+    pub password_hash: String,
+
+    pub created_at: chrono::DateTime<Utc>,
+    pub updated_at: chrono::DateTime<Utc>,
+}
diff --git a/plan-server/src/identity.rs b/plan-server/src/identity.rs
new file mode 100644
index 0000000..bc9ec51
--- /dev/null
+++ b/plan-server/src/identity.rs
@@ -0,0 +1,8 @@
+use plan_proto::{plan::PlanId, user::UserId};
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct SessionIdentity {
+    pub user_id: UserId,
+    pub user_name: String,
+    pub plan_id: PlanId,
+}
diff --git a/plan-server/src/main.rs b/plan-server/src/main.rs
new file mode 100644
index 0000000..7d60fc6
--- /dev/null
+++ b/plan-server/src/main.rs
@@ -0,0 +1,372 @@
+mod db;
+mod identity;
+mod runner;
+mod session;
+
+use axum::{
+    BoxError, Router, debug_handler,
+    error_handling::HandleErrorLayer,
+    extract::State,
+    http::{Request, StatusCode, header},
+    response::IntoResponse,
+    routing::{any, get, post, put},
+};
+use axum_extra::{
+    TypedHeader,
+    handler::HandlerCallWithExtractors,
+    headers::{self, Authorization},
+};
+use core::{fmt::Display, net::SocketAddr, str::FromStr, time::Duration};
+use plan_proto::{
+    cbor::Cbor,
+    error::ServerError,
+    limited::FixedLenString,
+    message::ClientMessage,
+    plan::{CreatePlan, UserPlans},
+    token::{Token, TokenLogin},
+    user::UserLogin,
+};
+use sqlx::postgres::PgPoolOptions;
+use std::io::Write;
+use tokio::sync::mpsc::UnboundedSender;
+use tower::{
+    ServiceBuilder,
+    buffer::BufferLayer,
+    limit::{RateLimit, RateLimitLayer, rate::Rate},
+};
+
+use crate::{db::Database, identity::SessionIdentity, runner::Runner, session::SessionManager};
+
+const fn parse_port(port: &str) -> u16 {
+    const fn parse_char(c: u8) -> u16 {
+        match c {
+            b'0' => 0,
+            b'1' => 1,
+            b'2' => 2,
+            b'3' => 3,
+            b'4' => 4,
+            b'5' => 5,
+            b'6' => 6,
+            b'7' => 7,
+            b'8' => 8,
+            b'9' => 9,
+            _ => panic!("not a decimal number"),
+        }
+    }
+    let port_bytes = port.as_bytes();
+    match port.len() {
+        0 => panic!("port too short"),
+        1 => parse_char(port_bytes[0]),
+        2 => (parse_char(port_bytes[0]) * 10) + parse_char(port_bytes[1]),
+        3 => {
+            (parse_char(port_bytes[0]) * 100)
+                + (parse_char(port_bytes[1]) * 10)
+                + parse_char(port_bytes[2])
+        }
+        4 => {
+            (parse_char(port_bytes[0]) * 1000)
+                + (parse_char(port_bytes[1]) * 100)
+                + (parse_char(port_bytes[2]) * 10)
+                + parse_char(port_bytes[3])
+        }
+        5 => {
+            (parse_char(port_bytes[0]) * 10000)
+                + (parse_char(port_bytes[1]) * 1000)
+                + (parse_char(port_bytes[2]) * 100)
+                + (parse_char(port_bytes[3]) * 10)
+                + parse_char(port_bytes[4])
+        }
+        _ => panic!("port too long"),
+    }
+}
+
+const PORT: u16 = match option_env!("PORT") {
+    Some(port) => parse_port(port),
+    None => 8080,
+};
+const HOST: &str = match option_env!("HOST") {
+    Some(host) => host,
+    None => "127.0.0.1",
+};
+
+const DEFAULT_MAX_PG_CONNECTIONS: u32 = 30;
+const DEFAULT_PG_CONN_STRING: &str = "postgres://emilis@localhost/calendar";
+
+#[tokio::main]
+async fn main() {
+    // pretty_env_logger::init();
+    use colored::Colorize;
+    pretty_env_logger::formatted_builder()
+        .parse_default_env()
+        .format(|f, record| {
+            let time = chrono::Local::now().time().to_string().dimmed();
+
+            match record.file() {
+                Some(file) => {
+                    let file = format!(
+                        "[{file}{}]",
+                        record
+                            .line()
+                            .map(|l| format!(":{l}"))
+                            .unwrap_or_else(String::new),
+                    )
+                    .dimmed();
+                    let level = match record.level() {
+                        log::Level::Error => "[err]".red().bold(),
+                        log::Level::Warn => "[warn]".yellow().bold(),
+                        log::Level::Info => "[info]".white().bold(),
+                        log::Level::Debug => "[debug]".dimmed().bold(),
+                        log::Level::Trace => "[trace]".dimmed(),
+                    };
+                    let args = record.args();
+
+                    let arrow = "➢".bold().magenta();
+                    writeln!(
+                        f,
+                        "{time} {file}\n{level} {arrow} {args}",
+                        // "⇗⇘⇗⇘⇗⇘".bold().dimmed(),
+                    )
+                }
+                _ => writeln!(f, "{time} [{}] {}", record.level(), record.args()),
+            }
+        })
+        .try_init()
+        .unwrap();
+
+    let default_panic = std::panic::take_hook();
+    std::panic::set_hook(Box::new(move |info| {
+        default_panic(info);
+        std::process::exit(1);
+    }));
+
+    let listen_addr =
+        SocketAddr::from_str(format!("{HOST}:{PORT}").as_str()).expect("invalid host/port");
+
+    let pg_pool = PgPoolOptions::new()
+        .max_connections(
+            std::env::var("MAX_DB_CONNECTIONS")
+                .ok()
+                .and_then(|val| u32::from_str(&val).ok())
+                .unwrap_or(DEFAULT_MAX_PG_CONNECTIONS),
+        )
+        .connect(
+            std::env::var("PG_CONN_STRING")
+                .unwrap_or_else(|_| String::from(DEFAULT_PG_CONN_STRING))
+                .as_str(),
+        )
+        .await
+        .expect("could not init db");
+    let db = Database::new(pg_pool);
+
+    db.migrate().await;
+
+    let (send_server, recv_server) = tokio::sync::mpsc::unbounded_channel();
+    let state = AppState {
+        db: db.clone(),
+        message_sender: send_server,
+        session_manager: SessionManager::new(),
+    };
+    let sessions = state.session_manager.clone();
+    tokio::spawn(async move {
+        Runner::new(recv_server, db, sessions).run().await;
+        log::error!("runner ended");
+        std::process::exit(0x40);
+    });
+
+    let app = Router::new()
+        .route("/s/users", put(signup))
+        .route("/s/tokens", post(signin))
+        // .route("/s/tokens/check", get(check_token))
+        .route("/s/plans/{id}", any(session::calendar_session))
+        .route("/s/plans", get(my_plans))
+        .route("/s/plans", post(new_plan))
+        .route(
+            "/s/tokens/check",
+            get(check_token).layer(
+                ServiceBuilder::new()
+                    .layer(HandleErrorLayer::new(|err: BoxError| async move {
+                        (
+                            StatusCode::INTERNAL_SERVER_ERROR,
+                            format!("Unhandled error: {}", err),
+                        )
+                    }))
+                    .layer(BufferLayer::new(0x1000))
+                    .layer(RateLimitLayer::new(100, Duration::from_secs(10))),
+            ),
+        )
+        .with_state(state)
+        .layer(tower_http::cors::CorsLayer::permissive().allow_headers([header::AUTHORIZATION]))
+        .fallback(get(handle_http_static));
+    let listener = tokio::net::TcpListener::bind(listen_addr).await.unwrap();
+    log::info!("listening on {}", listener.local_addr().unwrap());
+    axum::serve(
+        listener,
+        app.into_make_service_with_connect_info::<SocketAddr>(),
+    )
+    .await
+    .unwrap();
+}
+
+async fn new_plan(
+    State(AppState { db, .. }): State<AppState>,
+    TypedHeader(Authorization(login)): TypedHeader<Authorization<TokenLogin>>,
+    Cbor(plan): Cbor<CreatePlan>,
+) -> Result<impl IntoResponse, ServerError> {
+    let user = db.user().check_token(&login.0).await?;
+    let plan_id = db.plan().create_plan(user.id, plan).await?;
+    Ok((StatusCode::CREATED, Cbor(plan_id)))
+}
+
+#[debug_handler]
+async fn check_token(
+    State(AppState { db, .. }): State<AppState>,
+    TypedHeader(Authorization(login)): TypedHeader<Authorization<TokenLogin>>,
+) -> Result<impl IntoResponse, ServerError> {
+    db.user().check_token(&login.0).await?;
+    Ok(StatusCode::OK)
+}
+
+async fn my_plans(
+    State(AppState { db, .. }): State<AppState>,
+    TypedHeader(Authorization(login)): TypedHeader<Authorization<TokenLogin>>,
+) -> Result<impl IntoResponse, ServerError> {
+    let user = db.user().check_token(&login.0).await?;
+    Ok(Cbor(UserPlans {
+        created_plans: db.plan().get_user_plans(user.id).await?,
+        participating_in: db.plan().get_participating_plans(user.id).await?,
+    }))
+}
+
+async fn signin(
+    State(AppState { db, .. }): State<AppState>,
+    Cbor(UserLogin { username, password }): Cbor<UserLogin>,
+) -> Result<impl IntoResponse, ServerError> {
+    let token = db.user().login(&username, &password).await?;
+
+    Ok(Cbor(Token {
+        username,
+        token: FixedLenString::new(token.token.clone()).ok_or_else(|| {
+            ServerError::InternalServerError(format!(
+                "could not get a fixed len string for token [{}]",
+                token.token
+            ))
+        })?,
+        created_at: token.created_at,
+        expires_at: token.expires_at,
+    })
+    .into_response())
+}
+
+async fn signup(
+    State(AppState { db, .. }): State<AppState>,
+    Cbor(UserLogin { username, password }): Cbor<UserLogin>,
+) -> Result<impl IntoResponse, ServerError> {
+    db.user().create(&username, &password).await?;
+    Ok(StatusCode::CREATED)
+}
+
+#[derive(Debug, Clone)]
+struct AppState {
+    db: Database,
+    session_manager: SessionManager,
+    message_sender: UnboundedSender<(SessionIdentity, ClientMessage)>,
+}
+
+async fn handle_http_static(req: Request<axum::body::Body>) -> impl IntoResponse {
+    use mime_sniffer::MimeTypeSniffer;
+    const INDEX_FILE: &[u8] = include_bytes!("../../plan/dist/index.html");
+    let path = req.uri().path();
+
+    plan_macros::include_dist!(DIST_FILES, "plan/dist");
+
+    let file = if let Some(file) = DIST_FILES.iter().find_map(|(file_path, file)| {
+        if *file_path == path {
+            Some(*file)
+        } else {
+            None
+        }
+    }) {
+        file
+    } else {
+        return (
+            [(header::CONTENT_TYPE, "text/html".to_string())],
+            INDEX_FILE,
+        );
+    };
+
+    let mime = if path.ends_with(".js") {
+        "text/javascript".to_string()
+    } else if path.ends_with(".css") {
+        "text/css".to_string()
+    } else if path.ends_with(".wasm") {
+        "application/wasm".to_string()
+    } else if path.ends_with(".svg") {
+        "image/svg+xml".to_string()
+    } else {
+        file.sniff_mime_type()
+            .unwrap_or("application/octet-stream")
+            .to_string()
+    };
+
+    ([(header::CONTENT_TYPE, mime)], file)
+}
+
+struct XForwardedFor(String);
+
+impl Display for XForwardedFor {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(self.0.as_str())
+    }
+}
+
+impl headers::Header for XForwardedFor {
+    fn name() -> &'static header::HeaderName {
+        static NAME: header::HeaderName = header::HeaderName::from_static("x-forwarded-for");
+        &NAME
+    }
+
+    fn decode<'i, I>(values: &mut I) -> Result<Self, headers::Error>
+    where
+        Self: Sized,
+        I: Iterator<Item = &'i header::HeaderValue>,
+    {
+        Ok(Self(
+            values
+                .next()
+                .and_then(|v| v.to_str().ok())
+                .ok_or(headers::Error::invalid())?
+                .to_string(),
+        ))
+    }
+
+    fn encode<E: Extend<header::HeaderValue>>(&self, _: &mut E) {}
+}
+
+pub trait LogError {
+    fn log_warn(self);
+    fn log_err(self);
+    fn log_debug(self);
+}
+
+impl<T, E> LogError for Result<T, E>
+where
+    E: Display,
+{
+    fn log_warn(self) {
+        if let Err(err) = self {
+            log::warn!("{err}");
+        }
+    }
+
+    fn log_err(self) {
+        if let Err(err) = self {
+            log::error!("{err}");
+        }
+    }
+
+    fn log_debug(self) {
+        if let Err(err) = self {
+            log::debug!("{err}")
+        }
+    }
+}
diff --git a/plan-server/src/runner.rs b/plan-server/src/runner.rs
new file mode 100644
index 0000000..7e744c6
--- /dev/null
+++ b/plan-server/src/runner.rs
@@ -0,0 +1,179 @@
+use std::collections::HashMap;
+
+use plan_proto::{
+    HalfHour,
+    error::ServerError,
+    message::{ClientMessage, ServerMessage},
+    plan::{Plan, PlanDay, PlanId},
+    user::UserId,
+};
+use tokio::sync::mpsc::UnboundedReceiver;
+use uuid::Uuid;
+
+use crate::{
+    LogError,
+    db::{
+        Database,
+        plan::{Day, TileOperation},
+    },
+    identity::SessionIdentity,
+    session::SessionManager,
+};
+
+pub struct Runner {
+    recv: UnboundedReceiver<(SessionIdentity, ClientMessage)>,
+    database: Database,
+    session: SessionManager,
+}
+
+pub(crate) enum ActionOutcome {
+    UpdateDay {
+        offset: u8,
+        day: PlanDay,
+        tiles: HashMap<UserId, Box<[HalfHour]>>,
+    },
+    SendPlan(Plan),
+}
+
+impl Runner {
+    pub const fn new(
+        recv: UnboundedReceiver<(SessionIdentity, ClientMessage)>,
+        database: Database,
+        session: SessionManager,
+    ) -> Self {
+        Self {
+            recv,
+            database,
+            session,
+        }
+    }
+
+    pub async fn run(mut self) {
+        loop {
+            let (ident, msg) = match self.recv.recv().await {
+                Some(next) => next,
+                None => panic!("runner recv channel closed"),
+            };
+            let outcome = match self.run_inner(ident.clone(), msg).await {
+                Ok(outcome) => outcome,
+                Err(err) => {
+                    log::debug!(
+                        "run_inner for {} ({}): {err}",
+                        ident.user_name,
+                        ident.user_id,
+                    );
+                    let message = if let ServerError::DatabaseError(err) = &err {
+                        let error_id = Uuid::new_v4();
+                        log::error!("database error[{error_id}]: {err}");
+
+                        ServerMessage::Error(ServerError::InternalServerError(format!(
+                            "internal server error. error id: {error_id}"
+                        )))
+                    } else {
+                        ServerMessage::Error(err)
+                    };
+                    self.session
+                        .send(ident.plan_id, ident.user_id, message)
+                        .await;
+                    continue;
+                }
+            };
+            match outcome {
+                ActionOutcome::UpdateDay { offset, day, tiles } => {
+                    let senders = self.session.get_all_plan_senders(ident.plan_id).await;
+
+                    for (user, send) in senders {
+                        send.send(ServerMessage::DayUpdate {
+                            offset,
+                            day: PlanDay {
+                                day_start: day.day_start,
+                                day_end: day.day_end,
+                                tiles_count: day.tiles_count.clone(),
+                                users_available: day.users_available.clone(),
+                                your_tiles: tiles.get(&user).cloned().unwrap_or_default(),
+                            },
+                        })
+                        .await
+                        .log_debug();
+                    }
+                }
+                ActionOutcome::SendPlan(plan) => {
+                    self.session
+                        .send(ident.plan_id, ident.user_id, ServerMessage::PlanInfo(plan))
+                        .await
+                }
+            }
+        }
+    }
+
+    pub(crate) async fn run_inner(
+        &mut self,
+        ident: SessionIdentity,
+        message: ClientMessage,
+    ) -> Result<ActionOutcome, ServerError> {
+        match message {
+            ClientMessage::GetPlan => Ok(ActionOutcome::SendPlan(
+                self.database
+                    .plan()
+                    .get_plan(ident.plan_id, ident.user_id)
+                    .await?,
+            )),
+            ClientMessage::MarkTile {
+                day_offset: offset,
+                tile,
+            } => {
+                self.database
+                    .plan()
+                    .mark_day_tile(
+                        ident.plan_id,
+                        ident.user_id,
+                        offset,
+                        tile,
+                        TileOperation::Mark,
+                    )
+                    .await?;
+                let tiles = self
+                    .database
+                    .plan()
+                    .day_tiles_per_user(ident.plan_id, offset)
+                    .await?;
+                let day = self.database.plan().get_day(ident.plan_id, offset).await?;
+                let day = self
+                    .database
+                    .plan()
+                    .get_day_tiles(day, ident.user_id)
+                    .await?;
+
+                Ok(ActionOutcome::UpdateDay { offset, day, tiles })
+            }
+            ClientMessage::UnmarkTile {
+                day_offset: offset,
+                tile,
+            } => {
+                self.database
+                    .plan()
+                    .mark_day_tile(
+                        ident.plan_id,
+                        ident.user_id,
+                        offset,
+                        tile,
+                        TileOperation::Unmark,
+                    )
+                    .await?;
+                let tiles = self
+                    .database
+                    .plan()
+                    .day_tiles_per_user(ident.plan_id, offset)
+                    .await?;
+                let day = self.database.plan().get_day(ident.plan_id, offset).await?;
+                let day = self
+                    .database
+                    .plan()
+                    .get_day_tiles(day, ident.user_id)
+                    .await?;
+
+                Ok(ActionOutcome::UpdateDay { offset, day, tiles })
+            }
+        }
+    }
+}
diff --git a/plan-server/src/session.rs b/plan-server/src/session.rs
new file mode 100644
index 0000000..127391f
--- /dev/null
+++ b/plan-server/src/session.rs
@@ -0,0 +1,350 @@
+use core::net::SocketAddr;
+use std::{collections::HashMap, sync::Arc};
+
+use axum::{
+    extract::{
+        ConnectInfo, Path, State, WebSocketUpgrade,
+        ws::{self, WebSocket},
+    },
+    response::IntoResponse,
+};
+use axum_extra::{TypedHeader, headers};
+use colored::Colorize;
+use futures::{SinkExt, lock::Mutex};
+use plan_proto::{
+    error::ServerError,
+    message::{ClientMessage, ServerMessage},
+    plan::PlanId,
+    token::TokenLogin,
+    user::UserId,
+};
+use thiserror::Error;
+use tokio::sync::mpsc::{Receiver, Sender, UnboundedSender};
+use uuid::Uuid;
+
+use crate::{
+    AppState, LogError, XForwardedFor,
+    db::{Database, user::User},
+    identity::SessionIdentity,
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct ConnectionId(u32);
+
+impl ConnectionId {
+    fn new() -> Self {
+        Self(rand::random())
+    }
+}
+
+#[allow(clippy::type_complexity)]
+#[derive(Debug, Clone)]
+pub struct SessionManager(Arc<Mutex<HashMap<UserId, HashMap<ConnectionId, Connection>>>>);
+
+pub struct Connection {
+    pub plan_id: PlanId,
+    pub sender: Sender<ServerMessage>,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Error)]
+pub enum SessionError {
+    #[error("the given connection id already exists for this user")]
+    ConnectionIdExists,
+}
+
+pub struct ConnectionDropToken(SessionManager, UserId, ConnectionId);
+
+impl Drop for ConnectionDropToken {
+    fn drop(&mut self) {
+        let (s, u, c) = (self.0.clone(), self.1, self.2);
+        tokio::spawn(async move {
+            s.drop_connection(u, c).await;
+        });
+    }
+}
+
+impl SessionManager {
+    pub fn new() -> Self {
+        Self(Arc::new(Mutex::new(HashMap::new())))
+    }
+
+    pub async fn send(&self, plan_id: PlanId, user_id: UserId, message: ServerMessage) {
+        for sender in self
+            .0
+            .lock()
+            .await
+            .get(&user_id)
+            .iter()
+            .flat_map(|conns| conns.values())
+            .filter_map(|conn| (conn.plan_id == plan_id).then_some(&conn.sender))
+        {
+            sender.send(message.clone()).await.log_debug();
+        }
+    }
+
+    pub async fn get_all_plan_senders(
+        &self,
+        plan_id: PlanId,
+    ) -> Box<[(UserId, Sender<ServerMessage>)]> {
+        self.0
+            .lock()
+            .await
+            .iter()
+            .flat_map(|(user, conns)| {
+                conns
+                    .values()
+                    .filter_map(|c| (c.plan_id == plan_id).then_some((*user, c.sender.clone())))
+            })
+            .collect::<Box<[_]>>()
+    }
+
+    pub async fn broadcast(&self, plan_id: PlanId, message: ServerMessage) {
+        for sender in self
+            .0
+            .lock()
+            .await
+            .iter()
+            .flat_map(|(_, conns)| {
+                conns
+                    .values()
+                    .filter_map(|c| (c.plan_id == plan_id).then_some(c.sender.clone()))
+            })
+            // Call collect due to [#98380](https://github.com/rust-lang/rust/issues/98380)
+            .collect::<Box<[_]>>()
+        {
+            sender.send(message.clone()).await.log_debug();
+        }
+    }
+
+    pub async fn add_connection(
+        &self,
+        user_id: UserId,
+        connection_id: ConnectionId,
+        plan_id: PlanId,
+        sender: Sender<ServerMessage>,
+    ) -> Result<ConnectionDropToken, SessionError> {
+        let mut sessions = self.0.lock().await;
+        let user_sessions = match sessions.get_mut(&user_id) {
+            Some(s) => s,
+            None => {
+                sessions.insert(user_id, HashMap::new());
+                sessions.get_mut(&user_id).unwrap()
+            }
+        };
+        if user_sessions.contains_key(&connection_id) {
+            return Err(SessionError::ConnectionIdExists);
+        }
+        user_sessions.insert(connection_id, Connection { plan_id, sender });
+
+        Ok(ConnectionDropToken(self.clone(), user_id, connection_id))
+    }
+
+    async fn drop_connection(&self, user_id: UserId, connection_id: ConnectionId) {
+        let mut sessions = self.0.lock().await;
+        let user_sessions = match sessions.get_mut(&user_id) {
+            Some(sessions) => sessions,
+            None => return,
+        };
+        let _ = user_sessions.remove(&connection_id);
+    }
+}
+
+pub async fn calendar_session(
+    ws: WebSocketUpgrade,
+    user_agent: Option<TypedHeader<headers::UserAgent>>,
+    x_forwarded_for: Option<TypedHeader<XForwardedFor>>,
+    ConnectInfo(addr): ConnectInfo<SocketAddr>,
+    State(state): State<AppState>,
+    Path(plan_id): Path<PlanId>,
+) -> impl IntoResponse {
+    let who = x_forwarded_for
+        .map(|x| x.to_string())
+        .unwrap_or_else(|| addr.to_string())
+        .italic();
+
+    // log::debug!(
+    //     "{who}{} connected.",
+    //     user_agent
+    //         .map(|agent| format!(" (User-Agent: {})", agent.as_str()))
+    //         .unwrap_or_default(),
+    // );
+
+    // finalize the upgrade process by returning upgrade callback.
+    // we can customize the callback by sending additional info such as address.
+    ws.on_upgrade(move |mut socket| async move {
+        let ident = match get_identification(&mut socket, &who, state.db.clone()).await {
+            Ok(ident) => ident,
+            Err(err) => {
+                socket
+                    .send({
+                        ws::Message::Binary({
+                            let mut v = Vec::new();
+                            if let Err(err) =
+                                ciborium::into_writer(&ServerMessage::Error(err.clone()), &mut v)
+                            {
+                                log::info!("encoding error message for {who}: {err}");
+                                return;
+                            }
+                            v.into()
+                        })
+                    })
+                    .await
+                    .log_debug();
+                log::info!("identification failed for {who}: {err}");
+                if let Err(err) = socket.close().await {
+                    log::warn!("closing socket on identification fail: {err}")
+                }
+                return;
+            }
+        };
+
+        // check if the plan is real
+        if let Err(err) = state.db.plan().get_plan(plan_id, ident.id).await {
+            log::info!("getting plan: {err}; rejecting connection");
+            socket
+                .send({
+                    ws::Message::Binary({
+                        let mut v = Vec::new();
+                        if let Err(err) =
+                            ciborium::into_writer(&ServerMessage::Error(err.clone()), &mut v)
+                        {
+                            log::info!("encoding error message for {who}: {err}");
+                            return;
+                        }
+                        v.into()
+                    })
+                })
+                .await
+                .log_debug();
+        }
+        // log::debug!("connected {who} as {ident}");
+        let (send, recv) = tokio::sync::mpsc::channel(100);
+        let mut connection_id = ConnectionId::new();
+        let token = loop {
+            match state
+                .session_manager
+                .add_connection(ident.id, connection_id, plan_id, send.clone())
+                .await
+            {
+                Ok(token) => break token,
+                Err(SessionError::ConnectionIdExists) => connection_id = ConnectionId::new(),
+            }
+        };
+        Session::new(
+            socket,
+            SessionIdentity {
+                plan_id,
+                user_id: ident.id,
+                user_name: ident.username.clone(),
+            },
+            token,
+            recv,
+            state.message_sender,
+        )
+        .run()
+        .await;
+
+        // log::debug!("ending connection with {who}");
+    })
+}
+
+async fn get_identification(
+    socket: &mut WebSocket,
+    who: &str,
+    db: Database,
+) -> Result<User, ServerError> {
+    db.user()
+        .check_token(
+            &ciborium::from_reader::<TokenLogin, &[u8]>(
+                &socket
+                    .recv()
+                    .await
+                    .ok_or(ServerError::ConnectionError)?
+                    .map_err(|err| {
+                        ServerError::InvalidRequest(format!("parse token request: {err}"))
+                    })?
+                    .into_data(),
+            )?
+            .0,
+        )
+        .await
+}
+
+struct Session {
+    socket: WebSocket,
+    identity: SessionIdentity,
+    connection_token: ConnectionDropToken,
+    recv: Receiver<ServerMessage>,
+    send: UnboundedSender<(SessionIdentity, ClientMessage)>,
+}
+
+impl Session {
+    const fn new(
+        socket: WebSocket,
+        identity: SessionIdentity,
+        connection_token: ConnectionDropToken,
+        recv: Receiver<ServerMessage>,
+        send: UnboundedSender<(SessionIdentity, ClientMessage)>,
+    ) -> Self {
+        Self {
+            send,
+            recv,
+            socket,
+            identity,
+            connection_token,
+        }
+    }
+
+    async fn handle_message(&mut self, message: ServerMessage) -> Result<(), anyhow::Error> {
+        self.socket
+            .send({
+                ws::Message::Binary({
+                    let mut v = Vec::new();
+                    ciborium::into_writer(&message, &mut v)?;
+                    v.into()
+                })
+            })
+            .await?;
+        Ok(())
+    }
+
+    async fn run(mut self) {
+        loop {
+            tokio::select! {
+                r = self.recv.recv() => {
+                    match r {
+                        Some(msg) => self.handle_message(msg).await.log_debug(),
+                        None => {
+                            log::info!("recv channel closed");
+                            return;
+                        },
+                    }
+                }
+                r = self.socket.recv() => {
+                    match r {
+                        Some(Ok(msg)) => match ciborium::from_reader::<ClientMessage, _>(msg.into_data().iter().as_slice()) {
+                            Ok(msg) => self.send.send((self.identity.clone(), msg)).log_debug(),
+                            Err(err) => {
+                                self.handle_message(ServerMessage::Error(ServerError::InvalidRequest(
+                                    err.to_string(),
+                                )))
+                                .await
+                                .log_debug();
+                                log::info!("error decoding client message: {err}");
+                                continue;
+                            }
+                        },
+                        Some(Err(err)) => {
+                            log::warn!("socket error: {err}");
+                            return;
+                        }
+                        None => {
+                            log::info!("socket closed");
+                            return;
+                        },
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/plan/Cargo.lock b/plan/Cargo.lock
new file mode 100644
index 0000000..1e6a637
--- /dev/null
+++ b/plan/Cargo.lock
@@ -0,0 +1,1531 @@
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+# It is not intended for manual editing.
+version = 4
+
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+ "libc",
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+ "boolinator",
+ "once_cell",
+ "prettyplease",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+]
+
+[[package]]
+name = "yew-router"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ca1d5052c96e6762b4d6209a8aded597758d442e6c479995faf0c7b5538e0c6"
+dependencies = [
+ "gloo 0.10.0",
+ "js-sys",
+ "route-recognizer",
+ "serde",
+ "serde_urlencoded",
+ "tracing",
+ "urlencoding",
+ "wasm-bindgen",
+ "web-sys",
+ "yew",
+ "yew-router-macro",
+]
+
+[[package]]
+name = "yew-router-macro"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42bfd190a07ca8cfde7cd4c52b3ac463803dc07323db8c34daa697e86365978c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+]
diff --git a/plan/Cargo.toml b/plan/Cargo.toml
new file mode 100644
index 0000000..eab9809
--- /dev/null
+++ b/plan/Cargo.toml
@@ -0,0 +1,42 @@
+[package]
+name = "plan"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+web-sys = { version = "0.3.77", features = [
+	"HtmlTableCellElement",
+	"Event",
+	"EventTarget",
+	"HtmlImageElement",
+	"HtmlDivElement",
+	"HtmlSelectElement",
+	"DomException",
+	"KeyboardEvent",
+	"Navigator",
+	"Permissions",
+	"PermissionDescriptor",
+	"PermissionName",
+	"PermissionStatus",
+	"PermissionState",
+	"AbortController",
+	"HtmlSpanElement",
+	"ReadableStreamDefaultReader",
+] }
+log = "0.4"
+yew = { version = "0.21", features = ["csr"] }
+yew-router = "0.18.0"
+serde = { version = "1.0", features = ["derive"] }
+gloo = "0.11"
+wasm-logger = "0.2"
+instant = { version = "0.1", features = ["wasm-bindgen"] }
+once_cell = "1"
+chrono = "0.4.40"
+futures = "0.3.31"
+wasm-bindgen-futures = "0.4.50"
+wasm-bindgen = { version = "0.2.100" }
+postcard = "1.0.0"
+thiserror = { version = "2" }
+plan-proto = { path = "../plan-proto", features = ["client"] }
+ciborium = { version = "0.2" }
+chrono-humanize = { version = "0.2.3", features = ["wasmbind"] }
diff --git a/plan/Trunk.toml b/plan/Trunk.toml
new file mode 100644
index 0000000..104387a
--- /dev/null
+++ b/plan/Trunk.toml
@@ -0,0 +1,15 @@
+[build]
+target = "index.html"       # The index HTML file to drive the bundling process.
+html_output = "index.html"  # The name of the output HTML file.
+# release = false             # Build in release mode.
+release = true             # Build in release mode.
+dist = "dist"               # The output dir for all final assets.
+public_url = "/"            # The public URL from which assets are to be served.
+filehash = true             # Whether to include hash values in the output file names.
+inject_scripts = true       # Whether to inject scripts (and module preloads) into the finalized output.
+offline = false             # Run without network access
+frozen = false              # Require Cargo.lock and cache are up to date
+locked = false              # Require Cargo.lock is up to date
+minify = "on_release"            # Control minification: can be one of: never, on_release, always
+# minify = "always"            # Control minification: can be one of: never, on_release, always
+no_sri = false              # Allow disabling sub-resource integrity (SRI)
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new file mode 100644
index 0000000..d482889
--- /dev/null
+++ b/plan/dist/index-1cee5a016147b48c.css
@@ -0,0 +1 @@
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diff --git a/plan/dist/index.html b/plan/dist/index.html
new file mode 100644
index 0000000..e7e4500
--- /dev/null
+++ b/plan/dist/index.html
@@ -0,0 +1,8 @@
+<!doctype html><meta charset=utf-8><meta content="width=device-width,initial-scale=1" name=viewport><title>plan</title><link href=/index-1cee5a016147b48c.css integrity=sha384-aITEjaJfyZ4JpPUEhD6yGS9hmzF9c5Tr4+r+QK5nguomArm3mEnD+xFoAt5pmjmb rel=stylesheet><link crossorigin href=/plan-9b4f658762b65072.js integrity=sha384-h1jfwrVuYoeRA3OCiyYxIc8jqBQ5qcEMNiINHfjap2dkWqu9kB26DEyFM5r40lXI rel=modulepreload><link as=fetch crossorigin href=/plan-9b4f658762b65072_bg.wasm integrity=sha384-3uwozNtXv3EZpHAdBo8zai0D3hFBMVpnHyhnSA+NTHqeAV/Pm9WMRvGVaWiKHW0w rel=preload type=application/wasm></head><body><app> <script type=module>import init, * as bindings from '/plan-9b4f658762b65072.js';
+const wasm = await init({ module_or_path: '/plan-9b4f658762b65072_bg.wasm' });
+
+
+window.wasmBindings = bindings;
+
+
+dispatchEvent(new CustomEvent("TrunkApplicationStarted", {detail: {wasm}}));</script><script>`use strict`;(()=>{let g=`div`,h=`0`;const a=`{{__TRUNK_ADDRESS__}}`;const b=`{{__TRUNK_WS_BASE__}}`;let c=``;c=c?c:window.location.protocol===`https:`?`wss`:`ws`;const d=c+ `://`+ a+ b+ `.well-known/trunk/ws`;class e{constructor(){this._overlay=document.createElement(g);const a=this._overlay.style;a.height=`100vh`;a.width=`100vw`;a.position=`fixed`;a.top=h;a.left=h;a.backgroundColor=`rgba(222, 222, 222, 0.5)`;a.fontFamily=`sans-serif`;a.zIndex=`1000000`;a.backdropFilter=`blur(1rem)`;const b=document.createElement(g);b.style.position=`absolute`;b.style.top=`30%`;b.style.left=`15%`;b.style.maxWidth=`85%`;this._title=document.createElement(g);this._title.innerText=`Build failure`;this._title.style.paddingBottom=`2rem`;this._title.style.fontSize=`2.5rem`;this._message=document.createElement(g);this._message.style.whiteSpace=`pre-wrap`;const c=document.createElement(g);c.innerHTML=`<svg xmlns="http://www.w3.org/2000/svg" width="64" height="64" fill="#dc3545" viewBox="0 0 16 16"><path d="M8.982 1.566a1.13 1.13 0 0 0-1.96 0L.165 13.233c-.457.778.091 1.767.98 1.767h13.713c.889 0 1.438-.99.98-1.767L8.982 1.566zM8 5c.535 0 .954.462.9.995l-.35 3.507a.552.552 0 0 1-1.1 0L7.1 5.995A.905.905 0 0 1 8 5zm.002 6a1 1 0 1 1 0 2 1 1 0 0 1 0-2z"/></svg>`;this._title.prepend(c);b.append(this._title,this._message);this._overlay.append(b);this._inject();window.setInterval(()=>{this._inject()},250)}reason(a){this._message.textContent=a}_inject(){if(!this._overlay.isConnected){document.body?.prepend(this._overlay)}}}class f{constructor(a){this.url=a;this.poll_interval=5000;this._overlay=null}start(){const a=new WebSocket(this.url);a.onmessage=a=>{const b=JSON.parse(a.data);switch(b.type){case `reload`:this.reload();break;case `buildFailure`:this.buildFailure(b.data);break}};a.onclose=()=>this.onclose()}onclose(){window.setTimeout(()=>{const a=new WebSocket(this.url);a.onopen=()=>window.location.reload();a.onclose=()=>this.onclose()},this.poll_interval)}reload(){window.location.reload()}buildFailure({reason:a}){console.error(`Build failed:`,a);console.debug(`Overlay`,this._overlay);if(!this._overlay){this._overlay=new e()};this._overlay.reason=a}}new f(d).start()})()</script> 
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new file mode 100644
index 0000000..07e54bc
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diff --git a/plan/dist/plan-9b4f658762b65072_bg.wasm b/plan/dist/plan-9b4f658762b65072_bg.wasm
new file mode 100644
index 0000000..47169e3
Binary files /dev/null and b/plan/dist/plan-9b4f658762b65072_bg.wasm differ
diff --git a/plan/index.html b/plan/index.html
new file mode 100644
index 0000000..aefe204
--- /dev/null
+++ b/plan/index.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+	<meta charset="utf-8" />
+	<meta name="viewport" content="width=device-width, initial-scale=1" />
+	<title>plan</title>
+	<link data-trunk rel="sass" href="index.scss" />
+</head>
+
+<body>
+	<app />
+</body>
+
+</html>
diff --git a/plan/index.scss b/plan/index.scss
new file mode 100644
index 0000000..44f5323
--- /dev/null
+++ b/plan/index.scss
@@ -0,0 +1,477 @@
+@use 'sass:color';
+
+body {
+	background-color: black;
+	color: white;
+	margin: 0;
+
+	& * {
+		font-family: 'Cute Font';
+	}
+}
+
+.content {
+	margin: 8px;
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+}
+
+.nfc-form {
+	font-size: 2em;
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+
+	button {
+		margin-top: 10px;
+		font-size: 1em;
+	}
+}
+
+button {
+	background-color: black;
+	color: white;
+	border: 1px solid white;
+	cursor: pointer;
+
+	&:hover {
+		background-color: white;
+		color: black;
+	}
+
+	&:disabled {
+		border-color: rgba(255, 255, 255, 0.3);
+		color: rgba(255, 255, 255, 0.3);
+
+		&:hover {
+			background-color: rgba(255, 255, 255, 0.1);
+		}
+	}
+}
+
+.content {
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+}
+
+.error {
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+	background-color: rgba(255, 0, 0, 0.1);
+	border: 1px solid rgba(255, 0, 0, 0.3);
+	text-align: center;
+
+	.details {}
+}
+
+.error-container {}
+
+.calendar {
+	user-select: none;
+	width: max-content;
+}
+
+.date-span {
+	font-size: 2rem;
+}
+
+.week {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: wrap;
+	list-style: none;
+	gap: 1vw;
+	max-width: 80vw;
+}
+
+@media only screen and (max-width : 999px) {
+	.day {
+		width: 50vw;
+	}
+}
+
+// @media only screen and (min-width : 1000px) {
+// 	.content {
+// 		margin-left: 5vw;
+// 		margin-right: 5vw;
+// 		display: flex;
+// 		flex-basis: content;
+// 		min-height: 100vh;
+// 	}
+// }
+
+
+.day {
+	padding: 10px 30px 10px 30px;
+	border: 1px solid rgba(255, 255, 255, 0.3);
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+}
+
+.date {
+	font-size: 1.2rem;
+}
+
+.day-tiles {
+	padding-left: 0;
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	list-style: none;
+
+}
+
+.tile {
+	flex-grow: 1;
+	flex-shrink: 1;
+	// border: 1px solid white;
+	padding: 10px;
+	cursor: pointer;
+	color: rgba(255, 255, 255, 0.7); // &:hover {
+	// 	background-color: rgba(255, 255, 255, 0.3);
+	// }
+
+	&.pending {
+		background-color: red;
+		color: black;
+
+		&:hover {
+			background-color: rgba(255, 255, 255, 0.7);
+		}
+	}
+
+	&.selected-mine {
+		// border: 1px solid white;
+		$border_color: white;
+		color: white;
+
+		&.border-middle {
+			border-left: 1px solid $border_color;
+			border-right: 1px solid $border_color;
+		}
+
+		&.border-top {
+			border-left: 1px solid $border_color;
+			border-right: 1px solid $border_color;
+			border-top: 1px solid $border_color;
+		}
+
+		&.border-bottom {
+			border-left: 1px solid $border_color;
+			border-right: 1px solid $border_color;
+			border-bottom: 1px solid $border_color;
+		}
+
+		&.border-lone {
+			border: 1px solid $border_color;
+		}
+
+	}
+
+	&[style] {
+		background-color: var(--color);
+	}
+}
+
+.tile:hover {
+	// background-color: rgba(255, 255, 255, 0.3);
+	backdrop-filter: invert(30%);
+}
+
+nav.user-nav {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: nowrap;
+	gap: 20px;
+	user-select: none;
+	width: max-content;
+	padding: 10px;
+	margin: 0;
+	// border: 1px solid white;
+	align-items: baseline;
+
+	.username {
+		width: max-content;
+	}
+
+	.sign-out {
+		position: absolute;
+		right: 20px;
+	}
+
+	font-size: 1rem;
+
+	button {
+		padding-top: 5px;
+		padding-bottom: 5px;
+		font-size: 1rem;
+	}
+}
+
+.new-plan {
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+	gap: 10px;
+
+
+}
+
+.field {
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	// width: max-content;
+	// min-width: 60%;
+	font-size: 1.5em;
+	width: 100%;
+}
+
+.days {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: wrap;
+	gap: 10px;
+}
+
+.faint {
+	filter: opacity(50%);
+	font-size: 0.5em;
+}
+
+.create-day {
+	border: 1px solid white;
+	padding: 10px;
+
+	display: flex;
+	flex-direction: column;
+	align-items: flex-start;
+	flex-wrap: nowrap;
+	// gap: 10px;
+
+	.remove {
+		width: 100%;
+		text-align: center;
+	}
+}
+
+.set-date {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: nowrap;
+
+	&>button {
+		flex-grow: 1;
+	}
+
+	&>.date {
+		padding-left: 5px;
+		padding-right: 5px;
+	}
+}
+
+.date-detail {
+	width: 100%;
+	text-align: center;
+}
+
+.message {
+	display: flex;
+	flex-direction: column;
+	width: 100%;
+	align-items: center;
+	flex-wrap: nowrap;
+}
+
+.click-backdrop {
+	z-index: 4;
+	background-color: rgba(0, 0, 0, 0.7);
+	position: fixed;
+	top: 0;
+	left: 0;
+	height: 200vh;
+	width: 100vw;
+	background-size: cover;
+}
+
+.dialog {
+	z-index: 5;
+	width: 100vw;
+	height: 100vh;
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	position: fixed;
+	top: 0;
+	left: 0;
+	align-items: center;
+	justify-content: center;
+
+	.dialog-box {
+		font-size: 2rem;
+		border: 1px solid white;
+		display: flex;
+		flex-direction: column;
+		flex-wrap: nowrap;
+		align-items: center;
+		padding-left: 30px;
+		padding-right: 30px;
+		padding-top: 10px;
+		padding-bottom: 10px;
+		background-color: black;
+
+		.options {
+			display: flex;
+			flex-direction: row;
+			flex-wrap: wrap;
+			gap: 20px;
+
+			&>button {
+				min-width: 4cm;
+				font-size: 1em;
+			}
+		}
+	}
+}
+
+
+.users-available {
+	list-style: none;
+
+	.user {
+		display: flex;
+		flex-direction: column;
+		flex-wrap: nowrap;
+		align-items: center;
+	}
+
+	.user:hover {
+		background-color: rgba(255, 255, 255, 0.3);
+	}
+
+	[last_available]:hover::after {
+		display: block;
+		position: absolute;
+		content: attr(last_available);
+		border: 1px solid white;
+		background: rgba(0, 0, 0, 0.7);
+		padding: .25em;
+	}
+}
+
+.signup,
+.signin {
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+	font-size: 1.5rem;
+
+	input {
+		background-color: black;
+		border: 1px solid white;
+		color: white;
+	}
+
+	.submit {
+		margin-top: 30px;
+		font-size: 1.5rem;
+	}
+}
+
+.fields {
+	display: flex;
+	align-items: center;
+	flex-direction: column;
+	gap: 10px;
+}
+
+@media only screen and (max-width : 999px) {
+
+	.created-plans,
+	.participating-plans {
+		width: 100%;
+	}
+}
+
+@media only screen and (min-width : 1000px) {
+
+	.created-plans,
+	.participating-plans {
+		width: 40vw;
+	}
+}
+
+.created-plans,
+.participating-plans {
+	padding: 0 30px 0 30px;
+	align-items: center;
+	display: flex;
+	gap: 10px;
+	flex-direction: column;
+}
+
+.plan-column {
+	width: 100%;
+}
+
+.main-plans {
+	user-select: none;
+	text-align: center;
+	display: flex;
+	flex-direction: row;
+	flex-wrap: wrap;
+	gap: 30px;
+}
+
+.plans {
+	list-style: none;
+	display: flex;
+	flex-direction: column;
+	gap: 10px;
+	padding-left: 0;
+
+	.plan-headline {
+		button {
+			width: 100%;
+		}
+	}
+
+	.plan-detail {
+		display: flex;
+		flex-direction: row;
+		gap: 30px;
+		font-size: 1.5rem;
+		padding: 10px;
+
+		.start-date {
+			filter: opacity(50%);
+		}
+	}
+}
+
+.splash {
+	display: flex;
+	flex-direction: column;
+	flex-wrap: nowrap;
+	align-items: center;
+	width: 100%;
+
+	.options {
+		display: flex;
+		flex-direction: row;
+		flex-wrap: wrap;
+		gap: 1cm;
+
+		& button {
+			font-size: 2rem;
+		}
+	}
+}
diff --git a/plan/src/components/dialog.rs b/plan/src/components/dialog.rs
new file mode 100644
index 0000000..3a699e8
--- /dev/null
+++ b/plan/src/components/dialog.rs
@@ -0,0 +1,55 @@
+use std::collections::HashMap;
+
+use yew::prelude::*;
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct DialogProps {
+    pub message: String,
+    pub options: Box<[String]>,
+    #[prop_or_default]
+    pub cancel_callback: Option<Callback<()>>,
+    pub callback: Callback<String>,
+}
+
+#[function_component]
+pub fn Dialog(
+    DialogProps {
+        message,
+        options,
+        cancel_callback,
+        callback,
+    }: &DialogProps,
+) -> Html {
+    let options = options
+        .iter()
+        .map(|opt| {
+            let callback = callback.clone();
+            let option = opt.clone();
+            let cb = Callback::from(move |_| {
+                callback.emit(option.clone());
+            });
+            html! {
+                <button onclick={cb}>{opt.clone()}</button>
+            }
+        })
+        .collect::<Html>();
+    let backdrop_click = cancel_callback.clone().map(|cancel_callback| {
+        Callback::from(move |_| {
+            cancel_callback.emit(());
+        })
+    });
+    html! {
+        <div class="click-backdrop" onclick={backdrop_click}>
+            <div class="dialog">
+                <div class="dialog-box">
+                    <div class="message">
+                        <p>{message.clone()}</p>
+                    </div>
+                    <div class="options">
+                        {options}
+                    </div>
+                </div>
+            </div>
+        </div>
+    }
+}
diff --git a/plan/src/components/error.rs b/plan/src/components/error.rs
new file mode 100644
index 0000000..b400d6a
--- /dev/null
+++ b/plan/src/components/error.rs
@@ -0,0 +1,25 @@
+use yew::prelude::*;
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct ErrorDisplayProps {
+    pub state: UseStateHandle<Option<String>>,
+}
+
+#[function_component]
+pub fn ErrorDisplay(ErrorDisplayProps { state }: &ErrorDisplayProps) -> Html {
+    state
+        .as_ref()
+        .map(|err| {
+            let setter = state.setter();
+            let on_click = Callback::from(move |_| {
+                setter.set(None);
+            });
+            html! {
+                <div class="error-container">
+                    <span>{err.clone()}</span>
+                    <button onclick={on_click}>{"Ok"}</button>
+                </div>
+            }
+        })
+        .unwrap_or_default()
+}
diff --git a/plan/src/components/half_hour_range_select.rs b/plan/src/components/half_hour_range_select.rs
new file mode 100644
index 0000000..b5cc44c
--- /dev/null
+++ b/plan/src/components/half_hour_range_select.rs
@@ -0,0 +1,54 @@
+use core::ops::{Range, RangeInclusive};
+
+use plan_proto::HalfHour;
+use web_sys::HtmlSelectElement;
+use yew::prelude::*;
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct HalfHourRangeSelectProps {
+    pub id: String,
+    pub range: RangeInclusive<HalfHour>,
+    #[prop_or_default]
+    pub selected: Option<HalfHour>,
+    pub on_change: Callback<HalfHour>,
+}
+
+#[function_component]
+pub fn HalfHourRangeSelect(
+    HalfHourRangeSelectProps {
+        id,
+        range,
+        selected,
+        on_change,
+    }: &HalfHourRangeSelectProps,
+) -> Html {
+    let options = range
+        .clone()
+        .map(|half_hour| {
+            let selected = Some(half_hour) == *selected;
+            html! {
+                <option value={half_hour.to_string()} selected={selected}>
+                    {half_hour.to_string()}
+                </option>
+            }
+        })
+        .collect::<Html>();
+    let cb = on_change.clone();
+    let on_change_range = range.clone();
+    let on_change = Callback::from(move |ev: Event| {
+        if let Some(select) = ev.target_dyn_into::<HtmlSelectElement>() {
+            let selected = select.selected_index();
+            if selected == -1 {
+                return;
+            }
+            if let Some(selected) = on_change_range.clone().nth(selected as _) {
+                cb.emit(selected);
+            }
+        }
+    });
+    html! {
+        <select onchange={on_change} id={id.clone()} required=true>
+            {options}
+        </select>
+    }
+}
diff --git a/plan/src/components/nav.rs b/plan/src/components/nav.rs
new file mode 100644
index 0000000..05f767d
--- /dev/null
+++ b/plan/src/components/nav.rs
@@ -0,0 +1,77 @@
+use plan_proto::token::Token;
+use yew::prelude::*;
+
+use crate::{components::dialog::Dialog, storage::StorageKey};
+
+#[function_component]
+pub fn Nav() -> Html {
+    let token = Token::load_from_storage().ok();
+    let user = token
+        .as_ref()
+        .map(|token| {
+            html! {
+                <div class="user">
+                    <span class="username">{(*token.username).clone()}</span>
+                </div>
+            }
+        })
+        .unwrap_or_else(|| {
+            html! {
+                <>
+                    <a href="/signup"><button>{"signup"}</button></a>
+                    <a href="/signin"><button>{"signin"}</button></a>
+                </>
+            }
+        });
+    let dialog = use_state(|| false);
+    let logged_in_buttons = token.is_some().then(|| {
+        let confirm_signout = {
+            let dialog = dialog.clone();
+            Callback::from(move |_| {
+                dialog.set(true);
+            })
+        };
+
+        let dialog = dialog.then(|| {
+            let cancel_signout = {
+                let dialog = dialog.clone();
+                Callback::from(move |_| {
+                    dialog.set(false);
+                })
+            };
+            let callback = Callback::from(move |option: String| match option.as_str() {
+                "yes" => {
+                    Token::delete();
+                    let _ = gloo::utils::window().location().reload();
+                }
+                "no" => {
+                    dialog.set(false);
+                }
+                _ => {}
+            });
+            let options: Box<[String]> = Box::new([String::from("yes"), String::from("no")]);
+            html! {
+                <Dialog
+                    message={String::from("really sign out?")}
+                    options={options}
+                    cancel_callback={Some(cancel_signout)}
+                    callback={callback}
+                />
+            }
+        });
+        html! {
+            <>
+                <button onclick={confirm_signout} class="sign-out">{"sign out"}</button>
+                <a href="/plans/new"><button>{"new plan"}</button></a>
+                {dialog}
+            </>
+        }
+    });
+    html! {
+        <nav class="user-nav">
+            <a href="/"><button>{"home"}</button></a>
+            {user}
+            {logged_in_buttons}
+        </nav>
+    }
+}
diff --git a/plan/src/components/planview.rs b/plan/src/components/planview.rs
new file mode 100644
index 0000000..e01c45f
--- /dev/null
+++ b/plan/src/components/planview.rs
@@ -0,0 +1,314 @@
+use core::{
+    num::NonZeroU8,
+    ops::{Not, Range},
+};
+
+use chrono::{Days, NaiveDate, NaiveTime, Utc};
+use plan_proto::{
+    HalfHour,
+    message::ClientMessage,
+    plan::{Plan, PlanDay, UpdateTiles},
+};
+use serde::{Deserialize, Serialize};
+use web_sys::HtmlSpanElement;
+use yew::prelude::*;
+
+use crate::weekday::FullWeekday;
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct PlanViewProps {
+    pub plan: Plan,
+    pub update_day: Callback<ClientMessage>,
+}
+
+#[function_component]
+pub fn PlanView(
+    PlanViewProps {
+        plan:
+            Plan {
+                created_by,
+                title,
+                start_time,
+                days,
+            },
+        update_day,
+    }: &PlanViewProps,
+) -> Html {
+    if let Some(title) = title.as_ref() {
+        gloo::utils::document().set_title(title);
+    }
+    let date_span = title
+        .as_ref()
+        .map(|title| {
+            html! {
+                <span class="date-span">
+                    {title.clone()}
+                    <span class="faint">{format!(" by {created_by}")}</span>
+                </span>
+            }
+        })
+        .unwrap_or_else(|| {
+            html! {
+                <span class="date-span">
+                    {start_time.date_naive().to_string()}
+                    <span class="faint">{format!(" by {created_by}")}</span>
+                </span>
+            }
+        });
+    let max_count = days
+        .values()
+        .map(|day| {
+            day.tiles_count
+                .values()
+                .map(|v| v.get())
+                .max()
+                .unwrap_or_default()
+        })
+        .max()
+        .unwrap_or_default();
+    let days = {
+        let mut days = days
+            .iter()
+            .map(|(offset, plan_day)| {
+                let date = start_time
+                    .checked_add_days(Days::new(*offset as _))
+                    .unwrap_or_default()
+                    .naive_local()
+                    .date();
+                (
+                    *offset,
+                    html! {
+                        <Day
+                            offset={*offset}
+                            day={plan_day.clone()}
+                            date={date}
+                            update={update_day.clone()}
+                            max_count={max_count}
+                        />
+                    },
+                )
+            })
+            .collect::<Box<[(u8, Html)]>>();
+        days.sort_by_key(|(offset, _)| *offset);
+        days.into_iter().map(|(_, vnode)| vnode).collect::<Html>()
+    };
+
+    html! {
+        <div class="calendar">
+            {date_span}
+            <ol class="week">
+                {days}
+            </ol>
+        </div>
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct DayProps {
+    pub offset: u8,
+    pub day: PlanDay,
+    pub date: NaiveDate,
+    pub update: Callback<ClientMessage>,
+    pub max_count: u8,
+}
+
+#[function_component]
+pub fn Day(
+    DayProps {
+        offset,
+        day:
+            PlanDay {
+                day_start,
+                day_end,
+                tiles_count,
+                your_tiles,
+                users_available,
+            },
+        date,
+        update,
+        max_count,
+    }: &DayProps,
+) -> Html {
+    let pointer_state = use_state(|| false);
+    let on_selected_update = {
+        let update = update.clone();
+        let day_offset = *offset;
+        Callback::from(move |(tile, new_state)| {
+            let message = match new_state {
+                true => ClientMessage::MarkTile { tile, day_offset },
+                false => ClientMessage::UnmarkTile { tile, day_offset },
+            };
+
+            update.emit(message);
+        })
+    };
+
+    let range = *day_start..=*day_end;
+    let tiles = range
+        .clone()
+        .map(|half_hour| {
+            let count = tiles_count
+                .get(&half_hour)
+                .map(|t| t.get())
+                .unwrap_or_default();
+            let selected = your_tiles.contains(&half_hour);
+            let previous_selected = half_hour != HalfHour::Hour0Min0
+                && your_tiles.contains(&half_hour.previous_half_hour());
+            let next_selected = half_hour != HalfHour::Hour23Min30
+                && your_tiles.contains(&half_hour.next_half_hour());
+            let border = match (selected, previous_selected, next_selected) {
+                (false, _, _) => None,
+                (true, false, false) => Some(DayTileBorder::Lone),
+                (true, true, false) => Some(DayTileBorder::Bottom),
+                (true, false, true) => Some(DayTileBorder::Top),
+                (true, true, true) => Some(DayTileBorder::Middle),
+            };
+
+            html! {
+                <DayTile
+                    pointer_state={pointer_state.clone()}
+                    half_hour={half_hour}
+                    on_selected_update={on_selected_update.clone()}
+                    count={count}
+                    max_count={*max_count}
+                    selected_mine={selected}
+                    border={border}
+                />
+            }
+        })
+        .collect::<Html>();
+
+    let on_pointerdown_state = pointer_state.setter();
+    let on_pointerdown = Callback::from(move |_| {
+        on_pointerdown_state.set(true);
+    });
+    let on_pointerup_state = pointer_state.setter();
+    let on_pointerup = Callback::from(move |_| {
+        on_pointerup_state.set(false);
+    });
+    let users_available = users_available
+        .iter()
+        .map(|u| {
+            use chrono_humanize::Humanize;
+            let delta = u.last_updated_availability - Utc::now();
+            let last_seen = format!("last seen {}", delta.humanize());
+            html! {
+                <li class="user" last_available={last_seen}>
+                    <span class="username">{u.username.clone()}</span>
+                    <span class="faint">{format!("({})", delta.humanize())}</span>
+                </li>
+            }
+        })
+        .collect::<Html>();
+
+    html! {
+        <div class="day">
+            <span class="date">{date.to_string()}</span>
+            <span class="weekday">{date.full_weekday()}</span>
+            <ol
+                class="day-tiles"
+                onpointerdown={on_pointerdown}
+                onpointerup={on_pointerup.clone()}
+                onpointercancel={on_pointerup}
+            >
+                {tiles}
+            </ol>
+            <ol class="users-available">
+                {users_available}
+            </ol>
+        </div>
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub enum DayTileBorder {
+    Lone,
+    Top,
+    Middle,
+    Bottom,
+}
+
+impl DayTileBorder {
+    pub const fn class(&self) -> &'static str {
+        match self {
+            DayTileBorder::Lone => "border-lone",
+            DayTileBorder::Top => "border-top",
+            DayTileBorder::Middle => "border-middle",
+            DayTileBorder::Bottom => "border-bottom",
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct DayTileProps {
+    pub pointer_state: UseStateHandle<bool>,
+    pub half_hour: HalfHour,
+    pub on_selected_update: Callback<(HalfHour, bool)>,
+    pub count: u8,
+    pub max_count: u8,
+    pub selected_mine: bool,
+    pub border: Option<DayTileBorder>,
+}
+
+#[function_component]
+pub fn DayTile(
+    DayTileProps {
+        pointer_state,
+        half_hour,
+        on_selected_update,
+        count,
+        max_count,
+        selected_mine,
+        border,
+    }: &DayTileProps,
+) -> Html {
+    let pct = ((*count as f64) * (255.0 / 3.5)) / (*max_count as f64);
+    let pct = pct
+        .is_nan()
+        .not()
+        .then(|| format!("--color: #00FF00{:0>2X};", pct as u8));
+    let pending = use_state(|| false);
+    let border = border.as_ref().map(DayTileBorder::class);
+    let span = format!("{half_hour} — {}", half_hour.clone().next().unwrap());
+    let pending_class = (*pending && !*selected_mine).then_some("pending");
+    let pointer_state = pointer_state.clone();
+    let on_pointer_enter = {
+        let pending = pending.clone();
+        let selected = *selected_mine;
+        let update = on_selected_update.clone();
+        let half_hour = *half_hour;
+        Callback::from(move |_| {
+            if !*pointer_state {
+                return;
+            }
+            let new_state = !selected;
+            pending.set(new_state);
+            update.emit((half_hour, new_state));
+        })
+    };
+
+    let on_pointer_down = {
+        let update = on_selected_update.clone();
+        let half_hour = *half_hour;
+        let selected = *selected_mine;
+        let pending = pending.clone();
+        Callback::from(move |_| {
+            let new_state = !selected;
+            pending.set(new_state);
+            update.emit((half_hour, new_state));
+        })
+    };
+    let selected_mine = selected_mine.then_some("selected-mine");
+
+    html! {
+        <li
+            class={classes!("tile", selected_mine, pending_class, border)}
+            onpointerenter={on_pointer_enter}
+            onpointerdown={on_pointer_down}
+            // style={style}
+            style={pct}
+        >
+            <span class="timespan">{span}</span>
+        </li>
+    }
+}
diff --git a/plan/src/components/state_input.rs b/plan/src/components/state_input.rs
new file mode 100644
index 0000000..a0f5cf8
--- /dev/null
+++ b/plan/src/components/state_input.rs
@@ -0,0 +1,61 @@
+use web_sys::HtmlInputElement;
+use yew::prelude::*;
+
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub enum InputType {
+    #[default]
+    Text,
+    Password,
+    Date,
+    Time,
+}
+
+impl InputType {
+    const fn input_type(&self) -> &'static str {
+        match self {
+            InputType::Text => "text",
+            InputType::Password => "password",
+            InputType::Date => "date",
+            InputType::Time => "time",
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Properties)]
+pub struct StateInputProps {
+    #[prop_or_default]
+    pub name: String,
+    #[prop_or_default]
+    pub id: Option<String>,
+    pub state: UseStateHandle<String>,
+    #[prop_or_default]
+    pub input_type: InputType,
+}
+
+#[function_component]
+pub fn StateInput(
+    StateInputProps {
+        name,
+        id,
+        state,
+        input_type,
+    }: &StateInputProps,
+) -> Html {
+    let set = state.clone();
+
+    let on_input = Callback::from(move |ev: InputEvent| {
+        if let Some(input) = ev.target_dyn_into::<HtmlInputElement>() {
+            set.set(input.value());
+        }
+    });
+
+    html! {
+        <input
+            name={name.clone()}
+            id={id.clone()}
+            oninput={on_input}
+            value={state.to_string()}
+            type={input_type.input_type()}
+        />
+    }
+}
diff --git a/plan/src/error.rs b/plan/src/error.rs
new file mode 100644
index 0000000..3ffd559
--- /dev/null
+++ b/plan/src/error.rs
@@ -0,0 +1,50 @@
+use gloo::storage::errors::StorageError;
+use thiserror::Error;
+use wasm_bindgen::JsValue;
+use web_sys::DomException;
+
+#[derive(Debug, Error)]
+pub enum JsError {
+    #[error("abort: {0}")]
+    AbortError(String),
+    #[error("not allowed: {0}")]
+    NotAllowedError(String),
+    #[error("not supported: {0}")]
+    NotSupportedError(String),
+    #[error("not readable: {0}")]
+    NotReadableError(String),
+    #[error("network: {0}")]
+    NetworkError(String),
+    #[error("invalid state: {0}")]
+    InvalidState(String),
+    #[error("storage error: {0}")]
+    StorageError(#[from] StorageError),
+    #[error("type error: {0}")]
+    TypeError(String),
+    #[error("other: {code} - {name} - {message}")]
+    Other {
+        name: String,
+        code: u16,
+        message: String,
+    },
+}
+
+impl From<JsValue> for JsError {
+    fn from(value: JsValue) -> Self {
+        let exception = DomException::from(value);
+        match exception.name().as_str() {
+            "AbortError" => JsError::AbortError(exception.message()),
+            "NotAllowedError" => JsError::NotAllowedError(exception.message()),
+            "NotSupportedError" => JsError::NotSupportedError(exception.message()),
+            "NotReadableError" => JsError::NotReadableError(exception.message()),
+            "NetworkError" => JsError::NetworkError(exception.message()),
+            "InvalidStateError" => JsError::InvalidState(exception.message()),
+            "TypeError" => JsError::TypeError(exception.message()),
+            _ => JsError::Other {
+                name: exception.name(),
+                code: exception.code(),
+                message: exception.message(),
+            },
+        }
+    }
+}
diff --git a/plan/src/login.rs b/plan/src/login.rs
new file mode 100644
index 0000000..0cf704a
--- /dev/null
+++ b/plan/src/login.rs
@@ -0,0 +1,52 @@
+use gloo::net::http::Request;
+use plan_proto::{error::ServerError, plan::PlanId, token::Token};
+use yew::prelude::*;
+
+use crate::{
+    SERVER_URL,
+    request::RequestError,
+    storage::{LastPlanVisitedLoggedOut, StorageKey},
+};
+
+pub async fn login(body: Box<[u8]>, on_error: UseStateSetter<Option<String>>) {
+    let req = match Request::post(format!("{SERVER_URL}/s/tokens").as_str())
+        .header("content-type", crate::CBOR_CONTENT_TYPE)
+        .body(body)
+    {
+        Ok(req) => req,
+        Err(err) => {
+            on_error.set(Some(format!("creating login request: {err}")));
+            return;
+        }
+    };
+    let token = match crate::request::exec_request::<Token>(req).await {
+        Ok(token) => token,
+        Err(err) => {
+            on_error.set(Some(err.to_string()));
+            return;
+        }
+    };
+
+    if let Err(err) = token.save_to_storage() {
+        on_error.set(Some(format!("saving login token: {err}")));
+        return;
+    }
+    match LastPlanVisitedLoggedOut::load_from_storage() {
+        Ok(LastPlanVisitedLoggedOut(plan)) => {
+            gloo::utils::window()
+                .location()
+                .set_href(format!("/plans/{plan}").as_str())
+                .unwrap();
+        }
+        Err(_) => gloo::utils::window().location().set_href("/").unwrap(),
+    }
+}
+
+pub async fn check_token(token: Token) -> Result<(), RequestError> {
+    let req = Request::get(format!("{SERVER_URL}/s/tokens/check").as_str())
+        .header("authorization", format!("Bearer {}", token.token).as_str())
+        .build()
+        .expect("could not build auth request");
+
+    crate::request::exec_request(req).await
+}
diff --git a/plan/src/main.rs b/plan/src/main.rs
new file mode 100644
index 0000000..cee655b
--- /dev/null
+++ b/plan/src/main.rs
@@ -0,0 +1,227 @@
+mod pages {
+    pub mod mainpage;
+    pub mod new_plan;
+    pub mod not_found;
+    pub mod plan;
+    pub mod signin;
+    pub mod signup;
+}
+mod components {
+    pub mod dialog;
+    pub mod error;
+    pub mod half_hour_range_select;
+    pub mod nav;
+    pub mod planview;
+    pub mod state_input;
+}
+mod error;
+mod login;
+mod request;
+mod storage;
+mod weekday;
+use core::{
+    fmt::Display,
+    ops::{Bound, RangeBounds, RangeInclusive, Sub},
+};
+
+use futures::FutureExt;
+use gloo::net::http::Request;
+use plan_proto::{plan::PlanId, token::Token};
+use yew::prelude::*;
+use yew_router::{BrowserRouter, Routable, Switch};
+
+const CBOR_CONTENT_TYPE: &str = "application/cbor";
+
+use crate::{
+    components::nav::Nav,
+    pages::{
+        mainpage::{MainPage, SignedOutMainPage},
+        new_plan::NewPlan,
+        not_found::NotFound,
+        plan::PlanPage,
+        signin::Signin,
+        signup::Signup,
+    },
+    storage::{LastPlanVisitedLoggedOut, StorageKey},
+};
+
+fn main() {
+    wasm_logger::init(wasm_logger::Config::new(log::Level::Trace));
+    let document = gloo::utils::document();
+    let app_element = document.query_selector("app").unwrap().unwrap();
+
+    yew::Renderer::<Main>::with_root(app_element).render();
+}
+
+#[derive(Clone, Copy, Routable, PartialEq)]
+enum Route {
+    #[at("/")]
+    Home,
+    #[at("/plans/new")]
+    NewPlan,
+    #[at("/plans/:id")]
+    Plan { id: PlanId },
+    #[at("/signup")]
+    Signup,
+    #[at("/signin")]
+    Signin,
+    #[not_found]
+    #[at("/404")]
+    NotFound,
+}
+
+fn route(route: Route) -> Html {
+    match route {
+        Route::Signup => {
+            return html! {
+                <>
+                    <Nav />
+                    <div class="content">
+                        <Signup />
+                    </div>
+                </>
+            };
+        }
+        Route::Signin => {
+            return html! {
+                <>
+                    <Nav />
+                    <div class="content">
+                        <Signin />
+                    </div>
+                </>
+            };
+        }
+        Route::NotFound => {
+            return html! {
+                <>
+                    <Nav />
+                    <div class="content">
+                        <NotFound />
+                    </div>
+                </>
+            };
+        }
+        _ => {}
+    }
+    let token = match Token::load_from_storage() {
+        Ok(token) => token,
+        Err(err) => {
+            log::error!("loading token: {err}");
+            if let Route::Plan { id } = &route
+                && let Err(err) = LastPlanVisitedLoggedOut(*id).save_to_storage()
+            {
+                log::error!("saving last plan visit: {err}");
+            }
+            return html! {
+                <>
+                    <Nav />
+                    <div class="content">
+                        <SignedOutMainPage />
+                    </div>
+                </>
+            };
+        }
+    };
+
+    {
+        let token = (*token.token).clone();
+        let plan_id = if let Route::Plan { id } = &route {
+            Some(*id)
+        } else {
+            None
+        };
+        yew::platform::spawn_local(async move {
+            let Ok(req) = Request::get(format!("{SERVER_URL}/s/tokens/check").as_str())
+                .header("authorization", format!("Bearer {token}").as_str())
+                .build()
+            else {
+                return;
+            };
+            let Ok(resp) = req.send().fuse().await else {
+                return;
+            };
+            if !resp.ok() {
+                Token::delete();
+                if let Some(plan_id) = plan_id
+                    && let Err(err) = LastPlanVisitedLoggedOut(plan_id).save_to_storage()
+                {
+                    log::error!("saving visited plan id: {err}");
+                }
+                let _ = gloo::utils::window().location().set_href("/signin");
+            }
+        });
+    }
+
+    let body = match route {
+        Route::Plan { id } => html! {
+            <PlanPage id={id}/>
+        },
+        Route::Signin => html! {
+            <Signin />
+        },
+        Route::Home => html! {
+            <MainPage />
+        },
+        Route::Signup => html! {
+            <Signup />
+        },
+        Route::NotFound => html! {
+            <NotFound />
+        },
+        Route::NewPlan => html! {
+            <NewPlan />
+        },
+    };
+
+    html! {
+        <>
+            <Nav />
+            <div class="content">
+                <ContextProvider<Token> context={token.clone()}>
+                    {body}
+                </ContextProvider<Token>>
+            </div>
+        </>
+    }
+}
+
+#[function_component]
+fn Main() -> Html {
+    html! {
+        <BrowserRouter>
+            <Switch<Route> render={route}/>
+        </BrowserRouter>
+    }
+}
+
+const SERVER_URL: &str = match option_env!("SERVER_URL") {
+    Some(url) => url,
+    None => "http://127.0.0.1:8080",
+};
+const WS_URL: &str = match option_env!("WS_URL") {
+    Some(url) => url,
+    None => "ws://127.0.0.1:8080",
+};
+
+trait RangeInclusiveExt {
+    fn bounds_string_human(&self) -> String;
+}
+
+impl RangeInclusiveExt for RangeInclusive<usize> {
+    fn bounds_string_human(&self) -> String {
+        format!(
+            "{} to {}",
+            match self.start_bound() {
+                Bound::Included(incl) => incl.to_string(),
+                Bound::Excluded(excl) => excl.saturating_sub(1).to_string(),
+                Bound::Unbounded => String::from("infinite"),
+            },
+            match self.end_bound() {
+                Bound::Included(incl) => incl.to_string(),
+                Bound::Excluded(excl) => excl.saturating_add(1).to_string(),
+                Bound::Unbounded => String::from("infinite"),
+            }
+        )
+    }
+}
diff --git a/plan/src/pages/mainpage.rs b/plan/src/pages/mainpage.rs
new file mode 100644
index 0000000..3114a3d
--- /dev/null
+++ b/plan/src/pages/mainpage.rs
@@ -0,0 +1,179 @@
+use core::{num::NonZeroU8, time::Duration};
+use std::rc::Rc;
+
+use crate::{SERVER_URL, storage::StorageKey};
+use futures::{FutureExt, StreamExt, lock::Mutex, select};
+use gloo::net::http::Request;
+use plan_proto::{
+    HalfHour,
+    plan::{PlanHeadline, UserPlans},
+    token::Token,
+};
+use postcard::ser_flavors::ExtendFlavor;
+use serde::Serialize;
+use thiserror::Error;
+use wasm_bindgen::{JsCast, JsValue, prelude::Closure};
+use web_sys::{
+    AbortController, AbortSignal,
+    js_sys::{DataView, Object, Reflect, Uint8Array},
+};
+use yew::{
+    platform::pinned::mpsc::{TryRecvError, UnboundedReceiver},
+    prelude::*,
+};
+
+use crate::components::{error::ErrorDisplay, state_input::StateInput};
+
+fn plans_list(plans: &[PlanHeadline], name: &'static str) -> Html {
+    let plans = plans
+        .iter()
+        .map(|headline| {
+            let PlanHeadline { id, title, date } = headline;
+            let title = title.as_ref().map(|title| {
+                html! {
+                    <span class="title">{title.clone()}</span>
+                }
+            });
+            let date = date.format("%d/%m/%Y").to_string();
+            html! {
+                <li class="plan-headline">
+                    <a href={format!("/plans/{id}")}>
+                        <button>
+                            <span class="plan-detail">
+                                <span class="start-date">
+                                    {date}
+                                </span>
+                                {title}
+                            </span>
+                        </button>
+                    </a>
+                </li>
+            }
+        })
+        .collect::<Html>();
+
+    html! {
+        <div class="plan-column">
+            <h1>{name}</h1>
+            <ul class="plans">
+                {plans}
+            </ul>
+        </div>
+    }
+}
+
+#[function_component]
+pub fn MainPage() -> Html {
+    let error_state = use_state(|| None);
+    let error_obj = html! {
+        <ErrorDisplay state={error_state.clone()}/>
+    };
+    let token = match use_context::<Token>() {
+        Some(token) => token,
+        None => {
+            return html! {
+                <SignedOutMainPage />
+            };
+        }
+    };
+
+    let plans = use_state(|| None);
+    {
+        let plans = plans.clone();
+        let error_set = error_state.setter();
+        use_effect_with((), move |_| {
+            let plans = plans.clone();
+            wasm_bindgen_futures::spawn_local(async move {
+                let req = match Request::get(format!("{SERVER_URL}/s/plans").as_str())
+                    .header("authorization", format!("Bearer {}", token.token).as_str())
+                    .build()
+                {
+                    Ok(req) => req,
+                    Err(err) => {
+                        error_set.set(Some(err.to_string()));
+                        return;
+                    }
+                };
+                match crate::request::exec_request::<UserPlans>(req).await {
+                    Ok(headlines) => plans.set(Some(headlines)),
+                    Err(err) => {
+                        error_set.set(Some(err.to_string()));
+                    }
+                }
+            });
+            || ()
+        });
+    }
+
+    let created_plans = plans
+        .as_ref()
+        .map(|plans| &plans.created_plans)
+        .map(|p| {
+            if p.is_empty() {
+                return html! {
+                    <div class="message">
+                        <h1>{"you've created no plans"}</h1>
+                        <h2>{"why not start one?"}</h2>
+                        <a href="/plans/new"><button>{"new plan"}</button></a>
+                    </div>
+                };
+            }
+            plans_list(p, "your plans")
+        })
+        .unwrap_or_else(|| {
+            html! {
+                <div class="loading">
+                    <h1>{"loading..."}</h1>
+                </div>
+            }
+        });
+
+    let participating_plans = plans
+        .as_ref()
+        .map(|plans| &plans.participating_in)
+        .map(|p| {
+            if p.is_empty() {
+                return html! {
+                    <div class="message">
+                        <h1>{"you're not participating in any plans"}</h1>
+                        <h2>{"that sucks"}</h2>
+                    </div>
+                };
+            }
+            plans_list(p, "participating in")
+        })
+        .unwrap_or_else(|| {
+            html! {
+                <div class="loading">
+                    <h1>{"loading..."}</h1>
+                </div>
+            }
+        });
+
+    html! {
+        <>
+            <div class="main-plans">
+                <div class="created-plans">
+                    {created_plans}
+                </div>
+                <div class="participating-plans">
+                    {participating_plans}
+                </div>
+            </div>
+            {error_obj}
+        </>
+    }
+}
+
+#[function_component]
+pub fn SignedOutMainPage() -> Html {
+    html! {
+        <div class="splash">
+            <h1>{"plan"}</h1>
+            <div class="options">
+                <a href="/signin"><button>{"sign in"}</button></a>
+                <a href="/signup"><button>{"sign up"}</button></a>
+            </div>
+        </div>
+    }
+}
diff --git a/plan/src/pages/new_plan.rs b/plan/src/pages/new_plan.rs
new file mode 100644
index 0000000..1c619b6
--- /dev/null
+++ b/plan/src/pages/new_plan.rs
@@ -0,0 +1,376 @@
+use core::{
+    ops::{Not, RangeBounds},
+    str::FromStr,
+};
+use std::collections::HashMap;
+
+use chrono::{Datelike, Days, Local, NaiveDate, NaiveTime, SubsecRound, Timelike, Utc};
+use gloo::net::http::Request;
+use plan_proto::{
+    HalfHour,
+    error::ServerError,
+    limited::ClampedString,
+    plan::{CreatePlan, CreatePlanDay, PlanId},
+    token::Token,
+};
+use yew::prelude::*;
+
+use crate::{
+    CBOR_CONTENT_TYPE, RangeInclusiveExt, SERVER_URL,
+    components::{
+        error::ErrorDisplay,
+        half_hour_range_select::HalfHourRangeSelect,
+        state_input::{InputType, StateInput},
+    },
+    pages::mainpage::SignedOutMainPage,
+    request::RequestError,
+    storage::StorageKey,
+    weekday::FullWeekday,
+};
+
+#[function_component]
+pub fn NewPlan() -> Html {
+    let token = match use_context::<Token>() {
+        Some(token) => token,
+        None => {
+            return html! {
+                <SignedOutMainPage />
+            };
+        }
+    };
+    let check_token = token.clone();
+    let check_state = use_state(|| false);
+    if !*check_state {
+        let check_state = check_state.setter();
+        yew::platform::spawn_local(async move {
+            if let Err(RequestError::ServerError(ServerError::ExpiredToken)) =
+                crate::login::check_token(check_token).await
+            {
+                Token::delete();
+                let _ = gloo::utils::window().location().set_href("/signin");
+            }
+            check_state.set(true);
+        });
+    }
+
+    let error_state = use_state(|| None);
+    let error_obj = html! {
+        <ErrorDisplay state={error_state.clone()}/>
+    };
+
+    let title = use_state(String::new);
+    let date = use_state(|| Local::now().date_naive().format("%Y-%m-%d").to_string());
+    let end_time = use_state(|| HalfHour::Hour23Min30);
+    let plan = use_state(|| CreatePlan {
+        start_time: NaiveDate::from_str(date.as_str())
+            .ok()
+            .and_then(|d| {
+                d.and_time(HalfHour::Hour0Min0.into())
+                    .and_local_timezone(Local)
+                    .single()
+            })
+            .map(|t| t.to_utc())
+            .unwrap_or_else(Utc::now),
+        title: None,
+        days: HashMap::new(),
+    });
+    let add_day = {
+        let add_days_plan = plan.clone();
+        let end_time = end_time.clone();
+        Callback::from(move |_| {
+            let mut plan = (*add_days_plan).clone();
+            let mut offset = plan
+                .days
+                .keys()
+                .last()
+                .map(|offset| *offset + 1)
+                .unwrap_or_default();
+            while plan.days.contains_key(&offset) {
+                offset += 1;
+            }
+            plan.days.insert(
+                offset,
+                CreatePlanDay {
+                    day_start: plan.start_time.time().into(),
+                    day_end: *end_time,
+                },
+            );
+            add_days_plan.set(plan);
+        })
+    };
+    let mut days = plan
+        .days
+        .iter()
+        .map(|(offset, day)| {
+            let date = NaiveDate::from_str(date.as_str())
+                .ok()
+                .and_then(|d| d.checked_add_days(Days::new(*offset as _)));
+            let detail = date.map(|date| {
+                html! {
+                    <span>{"("}{date.full_weekday()}{")"}</span>
+                }
+            });
+            let date_str = date
+                .map(|d| d.to_string())
+                .unwrap_or_else(|| format!("+{offset} day"));
+            let range = {
+                let start: HalfHour = plan.start_time.time().into();
+                start..=*end_time
+            };
+            let on_start_plan = plan.clone();
+            let on_start_offset = *offset;
+            let on_start_change = Callback::from(move |new_start| {
+                let mut plan_update = (*on_start_plan).clone();
+                if let Some(day) = plan_update.days.get_mut(&on_start_offset) {
+                    day.day_start = new_start;
+                }
+                on_start_plan.set(plan_update);
+            });
+            let on_end_plan = plan.clone();
+            let on_end_offset = *offset;
+            let on_end_change = Callback::from(move |new_end| {
+                let mut plan_update = (*on_end_plan).clone();
+                if let Some(day) = plan_update.days.get_mut(&on_end_offset) {
+                    day.day_end = new_end;
+                }
+                on_end_plan.set(plan_update);
+            });
+            let minus_cb = (*offset > 0 && !plan.days.contains_key(&(*offset - 1))).then(|| {
+                let offset = *offset;
+                let plan = plan.clone();
+                Callback::from(move |_| {
+                    let mut p = (*plan).clone();
+                    if let Some(day) = p.days.remove(&offset) {
+                        p.days.insert(offset - 1, day);
+                    }
+                    plan.set(p);
+                })
+            });
+            let plus_cb =
+                (*offset < u8::MAX && !plan.days.contains_key(&(*offset + 1))).then(|| {
+                    let offset = *offset;
+                    let plan = plan.clone();
+                    Callback::from(move |_| {
+                        let mut p = (*plan).clone();
+                        if let Some(day) = p.days.remove(&offset) {
+                            p.days.insert(offset + 1, day);
+                        }
+                        plan.set(p);
+                    })
+                });
+
+            let yeet_cb = {
+                let offset = *offset;
+                let plan = plan.clone();
+                Callback::from(move |_| {
+                    let mut p = (*plan).clone();
+                    p.days.remove(&offset);
+                    plan.set(p);
+                })
+            };
+
+            (
+                *offset,
+                html! {
+                    <div class="create-day">
+                        <div class="set-date">
+                            <button
+                                disabled={minus_cb.is_none()}
+                                onclick={minus_cb.unwrap_or_default()}
+                            >
+                                {"-"}
+                            </button>
+                            <span class="date">{date_str}</span>
+                            <button
+                                disabled={plus_cb.is_none()}
+                                onclick={plus_cb.unwrap_or_default()}
+                            >{"+"}</button>
+                        </div>
+                        <div class="date-detail">
+                            {detail}
+                        </div>
+                        <div class="field">
+                            <label for={format!("start-time-{offset}")}>{"start time"}</label>
+                            <HalfHourRangeSelect
+                                id={format!("start-time-{offset}")}
+                                range={range.clone()}
+                                selected={day.day_start}
+                                on_change={on_start_change}
+                            />
+                        </div>
+                        <div class="field">
+                            <label for={format!("end-time-{offset}")}>{"end time"}</label>
+                            <HalfHourRangeSelect
+                                id={format!("end-time-{offset}")}
+                                range={range.clone()}
+                                selected={day.day_end}
+                                on_change={on_end_change}
+                            />
+                        </div>
+                        <button class="remove" onclick={yeet_cb}>{"remove"}</button>
+                    </div>
+                },
+            )
+        })
+        .collect::<Box<[_]>>();
+    days.sort_by_key(|(offset, _)| *offset);
+    let days = days.into_iter().map(|(_, d)| d).collect::<Html>();
+    let start_time_range = HalfHour::Hour0Min0..=*end_time;
+    let end_time_range = {
+        let limited_start = NaiveDate::from_str(date.as_str())
+            .map(|d| d <= Local::now().date_naive())
+            .unwrap_or_default();
+        if limited_start {
+            let start: HalfHour = Local::now().time().into();
+            start..=HalfHour::Hour23Min30
+        } else {
+            HalfHour::Hour0Min0..=HalfHour::Hour23Min30
+        }
+    };
+    let on_plan_start_update = {
+        let plan = plan.clone();
+        Callback::from(move |new_start: HalfHour| {
+            let mut p = (*plan).clone();
+            let local_time: NaiveTime = new_start.into();
+            if let Some(new_time) = p
+                .start_time
+                .naive_local()
+                .with_hour(local_time.hour())
+                .and_then(|local| local.with_minute(local_time.minute()))
+                .and_then(|local| local.with_second(0))
+                .map(|local| local.round_subsecs(0))
+                .and_then(|local| local.and_local_timezone(Local).single())
+            {
+                log::info!("new time: {new_time} (utc: {})", new_time.to_utc());
+                p.start_time = new_time.to_utc();
+            }
+
+            p.days.values_mut().for_each(|day| {
+                if day.day_start < new_start {
+                    day.day_start = new_start;
+                }
+            });
+
+            plan.set(p);
+        })
+    };
+    let on_plan_end_change = {
+        let end = end_time.setter();
+        let plan = plan.clone();
+        Callback::from(move |new: HalfHour| {
+            end.set(new);
+            let mut p = (*plan).clone();
+            p.days.values_mut().for_each(|d| {
+                if d.day_end > new {
+                    d.day_end = new;
+                }
+            });
+            plan.set(p);
+        })
+    };
+    let start_selected: HalfHour = plan.start_time.time().into();
+    let on_submit = {
+        let plan = plan.clone();
+        let token = token.clone();
+        let on_err = error_state.setter();
+        let title = title.clone();
+        Callback::from(move |_| {
+            let mut plan = (*plan).clone();
+            let title = match ClampedString::new(title.trim().to_string()) {
+                Ok(title) => title,
+                Err(range) => {
+                    let total_len = title.trim().chars().count();
+                    on_err.set(Some(format!(
+                        "title length must be between {} characters; not {total_len}",
+                        range.bounds_string_human()
+                    )));
+                    return;
+                }
+            };
+            plan.title = title.is_empty().not().then_some(title);
+            let req = match Request::post(format!("{SERVER_URL}/s/plans").as_str())
+                .header("authorization", format!("Bearer {}", token.token).as_str())
+                .header("content-type", CBOR_CONTENT_TYPE)
+                .body({
+                    let mut v = Vec::new();
+                    if let Err(err) = ciborium::into_writer(&plan, &mut v) {
+                        log::error!("serialize: {err}");
+                        on_err.set(Some(format!("serialize: {err}")));
+                        return;
+                    }
+                    v
+                }) {
+                Ok(req) => req,
+                Err(err) => {
+                    log::error!("create request: {err}");
+                    on_err.set(Some(format!("create request: {err}")));
+                    return;
+                }
+            };
+            let on_err = on_err.clone();
+            yew::platform::spawn_local(async move {
+                match crate::request::exec_request::<PlanId>(req).await {
+                    Ok(plan_id) => {
+                        let _ = gloo::utils::window()
+                            .location()
+                            .set_href(format!("/plans/{plan_id}").as_str());
+                    }
+                    Err(err) => {
+                        on_err.set(Some(err.to_string()));
+                    }
+                }
+            });
+            todo!()
+        })
+    };
+    html! {
+        <div class="new-plan">
+            <h1>{"new plan"}</h1>
+            <div class="fields">
+                <div class="field">
+                    <label for="title">
+                        {"title"}
+                        <span class="faint">{" (optional)"}</span>
+                    </label>
+                    <StateInput id={Some("title".to_string())} state={title.clone()} />
+                </div>
+                <div class="field">
+                    <label for="date">{"start date"}</label>
+                    <StateInput id={Some("date".to_string())} state={date} input_type={InputType::Date}/>
+                </div>
+                <div class="field">
+                    <label for="time">
+                        {"start time"}
+                        <span class="faint">{" (all days)"}</span>
+                    </label>
+                    <HalfHourRangeSelect
+                        id="time"
+                        range={start_time_range}
+                        on_change={on_plan_start_update}
+                        selected={start_selected}
+                    />
+                </div>
+                <div class="field">
+                    <label for="time-end">
+                        {"end time"}
+                        <span class="faint">{" (all days)"}</span>
+                    </label>
+                    <HalfHourRangeSelect
+                        id="time-end"
+                        range={end_time_range}
+                        on_change={on_plan_end_change}
+                        selected={*end_time}
+                    />
+                </div>
+                <button onclick={add_day}>{"add day"}</button>
+            </div>
+            <div class="days">
+                {days}
+            </div>
+            <div class="submit">
+                <button onclick={on_submit}>{"submit"}</button>
+            </div>
+            {error_obj}
+        </div>
+    }
+}
diff --git a/plan/src/pages/not_found.rs b/plan/src/pages/not_found.rs
new file mode 100644
index 0000000..b7c6885
--- /dev/null
+++ b/plan/src/pages/not_found.rs
@@ -0,0 +1,10 @@
+use yew::prelude::*;
+
+#[function_component]
+pub fn NotFound() -> Html {
+    html! {
+        <div class="not-found">
+            <h1>{"not found"}</h1>
+        </div>
+    }
+}
diff --git a/plan/src/pages/plan.rs b/plan/src/pages/plan.rs
new file mode 100644
index 0000000..28644ce
--- /dev/null
+++ b/plan/src/pages/plan.rs
@@ -0,0 +1,386 @@
+use core::{cell::RefCell, ops::Not, sync::atomic::AtomicBool, time::Duration};
+use std::rc::Rc;
+
+use chrono::TimeDelta;
+use chrono_humanize::{HumanTime, Humanize, Tense};
+use core::ops::Deref;
+use futures::{FutureExt, SinkExt, StreamExt, channel::mpsc::Receiver, stream::Fuse};
+use gloo::net::websocket::{Message, futures::WebSocket};
+use plan_proto::{
+    error::ServerError,
+    message::{ClientMessage, ServerMessage},
+    plan::{Plan, PlanId, UpdateTiles},
+    token::{Token, TokenLogin},
+};
+use serde::Serialize;
+use thiserror::Error;
+use wasm_bindgen::JsError;
+use yew::{platform::pinned::mpsc::UnboundedReceiver, prelude::*};
+
+use crate::{
+    WS_URL,
+    components::{error::ErrorDisplay, planview::PlanView},
+    pages::{mainpage::SignedOutMainPage, not_found::NotFound},
+    request::RequestError,
+    storage::{LastPlanVisitedLoggedOut, StorageKey},
+};
+
+#[derive(Debug, Clone, Copy, PartialEq, Properties)]
+pub struct PlanPageProps {
+    pub id: PlanId,
+}
+#[derive(Debug, PartialEq)]
+enum PlanState {
+    Loading,
+    Loaded(Plan),
+    NotFound,
+}
+
+#[derive(Debug, Clone, PartialEq, Error)]
+pub enum ConnectionError {
+    #[error("connection already active")]
+    ConnectionAlreadyActive,
+    #[error("socket open: {0}")]
+    SocketOpeningError(String),
+    #[error("socket closed")]
+    SocketClosed,
+}
+
+#[derive(Debug, Clone)]
+struct Session {
+    plan_id: PlanId,
+    state: UseStateSetter<PlanState>,
+    token: Token,
+    recv: Rc<RefCell<UnboundedReceiver<ClientMessage>>>,
+    err_setter: UseStateSetter<Option<String>>,
+    active: Rc<RefCell<()>>,
+    plan: Option<Plan>,
+    started: Rc<AtomicBool>,
+}
+
+impl Session {
+    fn new(
+        plan_id: PlanId,
+        state: UseStateSetter<PlanState>,
+        token: Token,
+        recv: Rc<RefCell<UnboundedReceiver<ClientMessage>>>,
+        err_setter: UseStateSetter<Option<String>>,
+    ) -> Self {
+        Self {
+            plan_id,
+            state,
+            token,
+            recv,
+            err_setter,
+            plan: None,
+            started: Rc::new(AtomicBool::new(false)),
+            active: Rc::new(RefCell::new(())),
+        }
+    }
+
+    pub fn start(&mut self) -> Result<(), ConnectionError> {
+        if self
+            .started
+            .swap(true, core::sync::atomic::Ordering::SeqCst)
+        {
+            panic!("start ran more than once");
+        }
+        log::debug!("starting connection runner");
+        let active = self
+            .active
+            .try_borrow_mut()
+            .map_err(|_| ConnectionError::ConnectionAlreadyActive)?;
+        core::mem::drop(active);
+        let mut conn = self.clone();
+        #[allow(clippy::await_holding_refcell_ref)]
+        yew::platform::spawn_local(async move {
+            let active = conn.active.clone();
+            conn.active = Rc::new(RefCell::new(()));
+            let active_borrow = active.borrow_mut();
+            conn.run().await;
+            core::mem::drop(active_borrow);
+        });
+
+        Ok(())
+    }
+
+    async fn send_to_socket<M: Serialize>(&self, ws: &mut Fuse<WebSocket>, msg: &M) {
+        if let Err(err) = ws
+            .send(Message::Bytes({
+                let mut v = Vec::new();
+                if let Err(err) = ciborium::into_writer(msg, &mut v) {
+                    log::error!("serialize message: {err}");
+                    self.err_setter
+                        .set(Some(format!("serialize message: {err}")));
+                }
+                v
+            }))
+            .await
+        {
+            log::error!("send message: {err}");
+            self.err_setter.set(Some(format!("send message: {err}")));
+        }
+    }
+
+    fn decode_message(&self, message: Message) -> Option<ServerMessage> {
+        match message {
+            Message::Text(_) => {
+                log::error!("unexpected: got a text message");
+                None
+            }
+            Message::Bytes(bytes) => {
+                match ciborium::from_reader::<ServerMessage, _>(bytes.as_slice()) {
+                    Ok(msg) => Some(msg),
+                    Err(err) => {
+                        log::error!("deserializing message: {err}");
+                        self.err_setter
+                            .set(Some(format!("deserializing message: {err}")));
+                        None
+                    }
+                }
+            }
+        }
+    }
+    fn set_plan_state(&mut self, msg: ServerMessage) {
+        match msg {
+            ServerMessage::Error(ServerError::NotFound) => self.state.set(PlanState::NotFound),
+            ServerMessage::Error(err) => {
+                self.err_setter.set(Some(format!("server: {err}")));
+            }
+            ServerMessage::DayUpdate { offset, day } => {
+                if let Some(mut plan) = self.plan.clone() {
+                    plan.days.insert(offset, day);
+                    self.plan.replace(plan.clone());
+                    self.state.set(PlanState::Loaded(plan))
+                }
+            }
+            ServerMessage::PlanInfo(plan) => {
+                self.plan.replace(plan.clone());
+                self.state.set(PlanState::Loaded(plan))
+            }
+        }
+    }
+
+    async fn connect(url: &str) -> Result<WebSocket, ConnectionError> {
+        let ws = WebSocket::open(url)
+            .map_err(|err| ConnectionError::SocketOpeningError(err.to_string()))?;
+        Ok(ws)
+        // struct WsConnectFuture(RefCell<Option<WebSocket>>);
+        // let ws_fut = WsConnectFuture(RefCell::new(Some(ws)));
+        // impl Future for WsConnectFuture {
+        //     type Output = Result<WebSocket, ConnectionError>;
+
+        //     fn poll(
+        //         self: std::pin::Pin<&mut Self>,
+        //         cx: &mut std::task::Context<'_>,
+        //     ) -> std::task::Poll<Self::Output> {
+        //         let ws = match self.0.try_borrow_mut() {
+        //             Ok(ws) => ws,
+        //             Err(_) => {
+        //                 log::warn!("ref mut");
+        //                 cx.waker().wake_by_ref();
+        //                 return std::task::Poll::Pending;
+        //             }
+        //         };
+        //         match ws.as_ref().map(|ws| ws.state()) {
+        //             Some(gloo::net::websocket::State::Connecting) => {
+        //                 cx.waker().wake_by_ref();
+        //                 std::task::Poll::Pending
+        //             }
+        //             Some(gloo::net::websocket::State::Open) => {
+        //                 std::task::Poll::Ready(Ok(self.0.take().unwrap()))
+        //             }
+        //             Some(gloo::net::websocket::State::Closing)
+        //             | Some(gloo::net::websocket::State::Closed) => {
+        //                 std::task::Poll::Ready(Err(ConnectionError::SocketClosed))
+        //             }
+        //             None => std::task::Poll::Pending,
+        //         }
+        //     }
+        // }
+
+        // ws_fut.await
+    }
+
+    #[allow(clippy::await_holding_refcell_ref)]
+    async fn run(&mut self) {
+        const DEFAULT_RECONNECT_WAIT: Duration = Duration::from_millis(100);
+        let mut reconnect_wait = DEFAULT_RECONNECT_WAIT;
+        let url = format!("{WS_URL}/s/plans/{}", self.plan_id);
+        loop {
+            log::info!("connecting to {url}");
+            let mut ws = match Self::connect(&url).await {
+                Ok(ws) => {
+                    // self.err_setter.set(None);
+                    ws.fuse()
+                }
+                Err(err) => {
+                    log::error!("connecting to web socket: {err}");
+                    self.err_setter
+                        .set(Some(format!("connecting to {url}: {err}")));
+                    yew::platform::time::sleep(reconnect_wait).await;
+                    reconnect_wait *= 2;
+                    continue;
+                }
+            };
+
+            if let Err(err) = ws
+                .send(Message::Bytes({
+                    let mut v = Vec::new();
+                    if let Err(err) =
+                        ciborium::into_writer(&TokenLogin(self.token.token.clone()), &mut v)
+                    {
+                        log::error!("serialize message: {err}");
+                        self.err_setter
+                            .set(Some(format!("serialize message: {err}")));
+                        return;
+                    }
+                    v
+                }))
+                .await
+            {
+                log::error!("authentication: {err}");
+                self.err_setter.set(Some(format!(
+                    "authentication: {err}; please reload the page"
+                )));
+                return;
+            }
+            log::info!("connected to {url}");
+
+            self.send_to_socket(&mut ws, &ClientMessage::GetPlan).await;
+
+            'inner: loop {
+                let mut recv = self.recv.borrow_mut();
+                let msg = futures::select! {
+                    r = recv.next() => {
+                        match r {
+                            Some(msg) => {
+                                self.send_to_socket(&mut ws, &msg).await;
+                                continue;
+                            },
+                            None => {
+                                log::error!("recv socket closed");
+                                self.err_setter.set(Some("recv socket closed".into()));
+                                return;
+                            }
+                        }
+                    }
+                    r = ws.next() => {
+                        match r {
+                            Some(Ok(msg)) => msg,
+                            Some(Err(err)) => {
+                                self.err_setter.set(Some(
+                                    format!("socket error: {err}; reconnecting {}",
+                                        TimeDelta::from_std(reconnect_wait)
+                                            .map(|r| {
+                                                HumanTime::from(r).to_text_en(chrono_humanize::Accuracy::Precise, Tense::Future).to_string()
+                                            })
+                                            .unwrap_or_default())
+                                    ));
+                                break 'inner;
+                            }
+                            None => {
+                                self.err_setter.set(Some("socket closed".into()));
+                                break 'inner;
+                            }
+                        }
+                    }
+                };
+                core::mem::drop(recv);
+                let Some(msg) = self.decode_message(msg) else {
+                    continue;
+                };
+                if let ServerMessage::Error(ServerError::ExpiredToken) = &msg {
+                    Token::delete();
+                    if let Err(err) = LastPlanVisitedLoggedOut(self.plan_id).save_to_storage() {
+                        log::error!("saving current visit: {err}");
+                    }
+                    let _ = gloo::utils::window().location().set_href("/signin");
+                    return;
+                }
+                self.set_plan_state(msg);
+            }
+            if let Err(err) = ws.close().await {
+                log::error!("closing websocket: {err}");
+            }
+            core::mem::drop(ws);
+            yew::platform::time::sleep(reconnect_wait).await;
+            reconnect_wait *= 2;
+        }
+    }
+}
+
+#[function_component]
+pub fn PlanPage(PlanPageProps { id }: &PlanPageProps) -> Html {
+    let plan_state = use_state_eq(|| PlanState::Loading);
+    let token = match use_context::<Token>() {
+        Some(token) => token,
+        None => {
+            if let Err(err) = LastPlanVisitedLoggedOut(*id).save_to_storage() {
+                log::error!("saving last logged out plan visit: {err}");
+            }
+            return html! {
+                <SignedOutMainPage />
+            };
+        }
+    };
+    let error_state = use_state(|| None);
+    let error_obj = html! {
+        <ErrorDisplay state={error_state.clone()}/>
+    };
+    let on_error = use_callback(error_state.setter(), |err: Option<String>, err_state| {
+        err_state.set(err);
+    });
+    let (send, recv) = yew::platform::pinned::mpsc::unbounded();
+    let send = use_state(|| send);
+    let recv = use_mut_ref(|| recv);
+    let session = {
+        let plan_state = plan_state.setter();
+        let plan_id = *id;
+        let token = token.clone();
+        let error_setter = error_state.setter();
+        use_mut_ref(|| Session::new(plan_id, plan_state, token, recv, error_setter))
+    };
+    let update_day = {
+        let send = send.clone();
+        Callback::from(move |update: ClientMessage| {
+            if let Err(err) = send.send_now(update) {
+                log::error!("send update: {err}");
+            }
+        })
+    };
+
+    let content = match plan_state.deref() {
+        PlanState::Loading => {
+            if let Err(err) = session
+                .try_borrow_mut()
+                .map_err(|_| ConnectionError::ConnectionAlreadyActive)
+                .and_then(|mut session| session.start())
+            {
+                error_state.set(Some(err.to_string()));
+            }
+            html! {
+                <div class="loading">
+                    <h1 class="faint">{"loading..."}</h1>
+                </div>
+            }
+        }
+        PlanState::Loaded(plan) => {
+            html! {
+                <PlanView plan={plan.clone()} update_day={update_day}/>
+            }
+        }
+        PlanState::NotFound => {
+            return html! {
+                <NotFound />
+            };
+        }
+    };
+
+    html! {
+        <div class="plan">
+            {content}
+            {error_obj}
+        </div>
+    }
+}
diff --git a/plan/src/pages/signin.rs b/plan/src/pages/signin.rs
new file mode 100644
index 0000000..7fca7e7
--- /dev/null
+++ b/plan/src/pages/signin.rs
@@ -0,0 +1,110 @@
+use plan_proto::{limited::ClampedString, user::UserLogin};
+use wasm_bindgen::JsCast;
+use web_sys::HtmlElement;
+use yew::prelude::*;
+
+use crate::{
+    RangeInclusiveExt,
+    components::{
+        error::ErrorDisplay,
+        state_input::{InputType, StateInput},
+    },
+    error::JsError,
+};
+
+#[function_component]
+pub fn Signin() -> Html {
+    let error_state = use_state(|| None);
+    let error_set = error_state.setter();
+    let error_obj = html! {
+        <ErrorDisplay state={error_state.clone()}/>
+    };
+    let username_state = use_state(String::new);
+    let password_state = use_state(String::new);
+
+    let (submit_username, submit_password) = (username_state.clone(), password_state.clone());
+    let on_submit = {
+        let err_set = error_set.clone();
+        Callback::from(move |_| {
+            let user = UserLogin {
+                username: match ClampedString::new((*submit_username).clone()) {
+                    Ok(username) => username,
+                    Err(range) => {
+                        err_set.set(Some(format!(
+                            "username length must be between {} characters",
+                            range.bounds_string_human()
+                        )));
+                        return;
+                    }
+                },
+                password: match ClampedString::new((*submit_password).clone()) {
+                    Ok(pass) => pass,
+                    Err(range) => {
+                        err_set.set(Some(format!(
+                            "password length must be between {} characters",
+                            range.bounds_string_human()
+                        )));
+                        return;
+                    }
+                },
+            };
+            let mut user_serialized = vec![];
+            if let Err(err) = ciborium::into_writer(&user, &mut user_serialized) {
+                error_set.set(Some(format!("serializing: {err}")));
+                return;
+            }
+            let error_set = error_set.clone();
+            yew::platform::spawn_local(async move {
+                crate::login::login(user_serialized.into_boxed_slice(), error_set).await;
+            });
+        })
+    };
+    let on_key_up = {
+        let on_submit = on_submit.clone();
+        Callback::from(move |ev: KeyboardEvent| {
+            if ev.key() != "Enter" {
+                return;
+            }
+
+            let Some(target) = ev.target_dyn_into::<HtmlElement>() else {
+                return;
+            };
+            if target.tag_name() != "INPUT" {
+                return;
+            }
+            let id = target.id();
+            match id.as_str() {
+                "username" => {
+                    if let Some(password) = target
+                        .parent_element()
+                        .and_then(|parent| parent.query_selector("#password").ok().flatten())
+                        .and_then(|password| password.dyn_into::<HtmlElement>().ok())
+                        && let Err(err) = password.focus().map_err(Into::<JsError>::into)
+                    {
+                        log::error!("{err}");
+                    }
+                    return;
+                }
+                "password" => {}
+                _ => return,
+            }
+
+            if let Ok(ev) = MouseEvent::new("click") {
+                on_submit.emit(ev);
+            };
+        })
+    };
+    html! {
+        <div class="signin" onkeyup={on_key_up}>
+            <h1>{"signin"}</h1>
+            <div class="fields">
+                <label>{"username"}</label>
+                <StateInput name="username" id={Some("username".to_string())} state={username_state}/>
+                <label>{"password"}</label>
+                <StateInput name="password" id={Some("password".to_string())} state={password_state} input_type={InputType::Password}/>
+            </div>
+            <button class="submit" onclick={on_submit}>{"submit"}</button>
+            {error_obj}
+        </div>
+    }
+}
diff --git a/plan/src/pages/signup.rs b/plan/src/pages/signup.rs
new file mode 100644
index 0000000..dbf9f5e
--- /dev/null
+++ b/plan/src/pages/signup.rs
@@ -0,0 +1,150 @@
+use gloo::net::http::Request;
+use plan_proto::{
+    error::ServerError, limited::ClampedString, message::ServerMessage, token::Token,
+    user::UserLogin,
+};
+use wasm_bindgen::{JsCast, convert::OptionIntoWasmAbi};
+use web_sys::{
+    HtmlElement, ReadableStreamDefaultReader,
+    js_sys::{Object, Reflect, Uint8Array},
+};
+use yew::prelude::*;
+
+use crate::{
+    RangeInclusiveExt, SERVER_URL,
+    components::{
+        error::ErrorDisplay,
+        state_input::{InputType, StateInput},
+    },
+    error::JsError,
+    login,
+    storage::StorageKey,
+};
+
+#[function_component]
+pub fn Signup() -> Html {
+    let error_state = use_state(|| None);
+    let error_set = error_state.setter();
+    let error_obj = html! {
+        <ErrorDisplay state={error_state.clone()}/>
+    };
+    let username_state = use_state(String::new);
+    let password_state = use_state(String::new);
+
+    let (submit_username, submit_password) = (username_state.clone(), password_state.clone());
+    let on_submit = {
+        let err_set = error_set.clone();
+        Callback::from(move |_| {
+            let user = UserLogin {
+                username: match ClampedString::new((*submit_username).clone()) {
+                    Ok(username) => username,
+                    Err(range) => {
+                        err_set.set(Some(format!(
+                            "username length must be between {} characters",
+                            range.bounds_string_human()
+                        )));
+                        return;
+                    }
+                },
+                password: match ClampedString::new((*submit_password).clone()) {
+                    Ok(pass) => pass,
+                    Err(range) => {
+                        err_set.set(Some(format!(
+                            "password length must be between {} characters",
+                            range.bounds_string_human()
+                        )));
+                        return;
+                    }
+                },
+            };
+            let mut user_serialized = vec![];
+            if let Err(err) = ciborium::into_writer(&user, &mut user_serialized) {
+                error_set.set(Some(format!("serializing: {err}")));
+                return;
+            }
+            match gloo::net::http::Request::put(format!("{SERVER_URL}/s/users").as_str())
+                .header("content-type", crate::CBOR_CONTENT_TYPE)
+                .body(user_serialized.clone())
+            {
+                Ok(req) => {
+                    let error_set = error_set.clone();
+                    yew::platform::spawn_local(async move {
+                        match req.send().await {
+                            Ok(resp) => {
+                                if resp.ok() {
+                                    crate::login::login(
+                                        user_serialized.into_boxed_slice(),
+                                        error_set,
+                                    )
+                                    .await
+                                } else if let Some(err) = resp.binary().await.ok().and_then(|b| {
+                                    ciborium::from_reader::<ServerError, _>(b.as_slice()).ok()
+                                }) {
+                                    error_set.set(Some(format!("creating user: {err}")));
+                                } else {
+                                    error_set.set(Some(format!(
+                                        "creating user: {} {}",
+                                        resp.status(),
+                                        resp.status_text()
+                                    )));
+                                }
+                            }
+                            Err(err) => error_set.set(Some(err.to_string())),
+                        }
+                    })
+                }
+                Err(err) => {
+                    error_set.set(Some(format!("create user request: {err}")));
+                }
+            }
+        })
+    };
+    let on_key_up = {
+        let on_submit = on_submit.clone();
+        Callback::from(move |ev: KeyboardEvent| {
+            if ev.key() != "Enter" {
+                return;
+            }
+
+            let Some(target) = ev.target_dyn_into::<HtmlElement>() else {
+                return;
+            };
+            if target.tag_name() != "INPUT" {
+                return;
+            }
+            let id = target.id();
+            match id.as_str() {
+                "username" => {
+                    if let Some(password) = target
+                        .parent_element()
+                        .and_then(|parent| parent.query_selector("#password").ok().flatten())
+                        .and_then(|password| password.dyn_into::<HtmlElement>().ok())
+                        && let Err(err) = password.focus().map_err(Into::<JsError>::into)
+                    {
+                        log::error!("{err}");
+                    }
+                    return;
+                }
+                "password" => {}
+                _ => return,
+            }
+
+            if let Ok(ev) = MouseEvent::new("click") {
+                on_submit.emit(ev);
+            };
+        })
+    };
+    html! {
+        <div class="signup" onkeyup={on_key_up}>
+            <h1>{"signup"}</h1>
+            <div class="fields">
+                <label>{"username"}</label>
+                <StateInput name="username" id={Some("username".to_string())} state={username_state}/>
+                <label>{"password"}</label>
+                <StateInput name="password" id={Some("password".to_string())} state={password_state} input_type={InputType::Password}/>
+            </div>
+            <button class="submit" onclick={on_submit}>{"submit"}</button>
+            {error_obj}
+        </div>
+    }
+}
diff --git a/plan/src/request.rs b/plan/src/request.rs
new file mode 100644
index 0000000..3638aef
--- /dev/null
+++ b/plan/src/request.rs
@@ -0,0 +1,25 @@
+use gloo::net::http::Request;
+use plan_proto::error::ServerError;
+use serde::de::DeserializeOwned;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum RequestError {
+    #[error("server error: {0}")]
+    ServerError(#[from] ServerError),
+    #[error("network error: {0}")]
+    NetworkError(#[from] gloo::net::Error),
+    #[error("deserialization error: {0}")]
+    DeserializationError(#[from] ciborium::de::Error<std::io::Error>),
+}
+
+pub async fn exec_request<R: DeserializeOwned>(req: Request) -> Result<R, RequestError> {
+    let resp = req.send().await?;
+    if !resp.ok() {
+        return Err(
+            ciborium::from_reader::<ServerError, _>(resp.binary().await?.as_slice())?.into(),
+        );
+    }
+    let body = resp.binary().await?;
+    Ok(ciborium::de::from_reader(body.as_slice())?)
+}
diff --git a/plan/src/storage.rs b/plan/src/storage.rs
new file mode 100644
index 0000000..eac6d87
--- /dev/null
+++ b/plan/src/storage.rs
@@ -0,0 +1,30 @@
+use gloo::storage::{LocalStorage, Storage, errors::StorageError};
+use plan_proto::{plan::PlanId, token::Token, user::UserLogin};
+use serde::{Deserialize, Serialize};
+
+use crate::error::JsError;
+
+pub trait StorageKey: for<'a> Deserialize<'a> + Serialize {
+    const KEY: &str;
+
+    fn load_from_storage() -> Result<Self, StorageError> {
+        LocalStorage::get(Self::KEY)
+    }
+
+    fn save_to_storage(&self) -> Result<(), StorageError> {
+        LocalStorage::set(Self::KEY, self)
+    }
+
+    fn delete() {
+        LocalStorage::delete(Self::KEY);
+    }
+}
+
+impl StorageKey for Token {
+    const KEY: &str = "login-token";
+}
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub struct LastPlanVisitedLoggedOut(pub PlanId);
+impl StorageKey for LastPlanVisitedLoggedOut {
+    const KEY: &str = "last-plan-visited-logged-out";
+}
diff --git a/plan/src/weekday.rs b/plan/src/weekday.rs
new file mode 100644
index 0000000..0677236
--- /dev/null
+++ b/plan/src/weekday.rs
@@ -0,0 +1,19 @@
+use chrono::{Datelike, NaiveDate, Weekday};
+
+pub trait FullWeekday {
+    fn full_weekday(&self) -> &'static str;
+}
+
+impl FullWeekday for NaiveDate {
+    fn full_weekday(&self) -> &'static str {
+        match self.weekday() {
+            Weekday::Mon => "Monday",
+            Weekday::Tue => "Tuesday",
+            Weekday::Wed => "Wednesday",
+            Weekday::Thu => "Thursday",
+            Weekday::Fri => "Friday",
+            Weekday::Sat => "Saturday",
+            Weekday::Sun => "Sunday",
+        }
+    }
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..5d56faf
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"