commit 2b65b6a1c5d874ffca8198aa9c87e7d92a54ddcb
Author: Dominic Grimm <dominic@dergrimm.net>
Date:   Mon Dec 12 17:54:07 2022 +0100

    Init

diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..045e248
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,25 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: ameba
+    image: veelenga/ameba
+    commands:
+      - cd bvplan
+      - ameba src
+  - name: build
+    image: tmaier/docker-compose
+    volumes:
+      - name: dockersock
+        path: /var/run/docker.sock
+    commands:
+      - docker-compose build --build-arg BUILD_ENV=development bvplan
+    depends_on:
+      - ameba
+
+volumes:
+  - name: dockersock
+    host:
+      path: /var/run/docker.sock
diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..af95812
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,11 @@
+POSTGRES_USER="bvplan"
+POSTGRES_PASSWORD="bvplan"
+
+RABBITMQ_USER="bvplan"
+RABBITMQ_PASSWORD="bvplan"
+
+BACKEND_UNTIS_API_URL="https://mese.webuntis.com/WebUntis/api/"
+BACKEND_UNTIS_RPC_URL="https://mese.webuntis.com/WebUntis/jsonrpc.do"
+BACKEND_UNTIS_SCHOOL=
+BACKEND_UNTIS_USERNAME=
+BACKEND_UNTIS_PASSWORD=
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..03bd412
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.env
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d6d7152
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: all dev prod
+
+all: prod
+
+dev:
+	docker-compose build --build-arg BUILD_ENV=development
+
+prod:
+	docker-compose build
diff --git a/backend/.dockerignore b/backend/.dockerignore
new file mode 100644
index 0000000..1b321f5
--- /dev/null
+++ b/backend/.dockerignore
@@ -0,0 +1,21 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+dist/
+Dockerfile
+.gitignore
+.dockerignore
+vendor/
+.editorconfig
diff --git a/backend/.editorconfig b/backend/.editorconfig
new file mode 100644
index 0000000..373508e
--- /dev/null
+++ b/backend/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*.rs]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
diff --git a/backend/.gitignore b/backend/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/backend/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/backend/Cargo.lock b/backend/Cargo.lock
new file mode 100644
index 0000000..c4eb9d7
--- /dev/null
+++ b/backend/Cargo.lock
@@ -0,0 +1,3337 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
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+ "once_cell",
+ "proc-macro2",
+ "quote",
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+]
+
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+ "js-sys",
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+ "web-sys",
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+]
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+ "wasm-bindgen-shared",
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
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+name = "winapi-i686-pc-windows-gnu"
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+ "windows_i686_gnu 0.36.1",
+ "windows_i686_msvc 0.36.1",
+ "windows_x86_64_gnu 0.36.1",
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+ "windows_aarch64_msvc 0.42.0",
+ "windows_i686_gnu 0.42.0",
+ "windows_i686_msvc 0.42.0",
+ "windows_x86_64_gnu 0.42.0",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc 0.42.0",
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+ "zstd-safe",
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+ "libc",
+ "zstd-sys",
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+name = "zstd-sys"
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+ "cc",
+ "libc",
+]
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
new file mode 100644
index 0000000..e1f67be
--- /dev/null
+++ b/backend/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+name = "backend"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "api"
+
+[[bin]]
+name = "worker"
+
+[profile.release]
+codegen-units = 1
+lto = "fat"
+strip = true
+panic = "abort"
+
+[dependencies]
+actix-cors = "0.6.4"
+actix-web = "4.2.1"
+anyhow = { version = "1.0.66", features = ["backtrace"] }
+celery = { git = "https://github.com/rusty-celery/rusty-celery.git", branch = "main" }
+chrono = { version = "0.4.23", features = ["serde"] }
+cookie = "0.16.1"
+diesel = { version = "2.0.2", features = ["i-implement-a-third-party-backend-and-opt-into-breaking-changes", "postgres", "chrono", "r2d2"] }
+env_logger = "0.10.0"
+envconfig = "0.10.0"
+juniper = "0.15.10"
+juniper_actix = "0.4.0"
+lazy_static = "1.4.0"
+log = "0.4.17"
+now = "0.1.3"
+reqwest = { version = "0.11.13", features = ["json"] }
+serde = "1.0.148"
+serde_json = "1.0.89"
+tokio = { version = "1.22.0", features = ["full"] }
+url = "2.3.1"
+
+[target.'cfg(not(target_env = "msvc"))'.dependencies]
+tikv-jemallocator = "0.5"
diff --git a/backend/Dockerfile b/backend/Dockerfile
new file mode 100644
index 0000000..42ac1e0
--- /dev/null
+++ b/backend/Dockerfile
@@ -0,0 +1,31 @@
+FROM lukemathwalker/cargo-chef:latest-rust-1.65.0 as chef
+WORKDIR /usr/src/backend
+
+FROM chef as planner
+RUN mkdir src && touch src/main.rs
+COPY ./Cargo.toml .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef as builder
+RUN cargo install diesel_cli --no-default-features --features postgres
+COPY --from=planner /usr/src/backend/recipe.json .
+RUN cargo chef cook --release --recipe-path recipe.json
+COPY ./src ./src
+RUN cargo build --release
+
+FROM debian:buster-slim as runner
+RUN apt update
+RUN apt install -y libpq5
+RUN apt install -y ca-certificates
+RUN apt-get clean
+RUN apt-get autoremove --yes
+RUN rm -rf /var/lib/{apt,dpkg,cache,log}/
+WORKDIR /usr/local/bin
+COPY --from=builder /usr/local/cargo/bin/diesel .
+WORKDIR /usr/src/backend
+COPY ./run.sh .
+RUN chmod +x ./run.sh
+COPY ./migrations ./migrations
+COPY --from=builder /usr/src/backend/target/release/api /usr/src/backend/target/release/worker ./bin/
+EXPOSE 80
+ENTRYPOINT [ "./run.sh" ]
diff --git a/backend/migrations/2022-12-03-124501_init/down.sql b/backend/migrations/2022-12-03-124501_init/down.sql
new file mode 100644
index 0000000..1f1c408
--- /dev/null
+++ b/backend/migrations/2022-12-03-124501_init/down.sql
@@ -0,0 +1,39 @@
+DROP TABLE substitution_query_results;
+
+DROP TABLE substitution_queries;
+
+DROP TABLE substitution_planned_queries;
+
+DROP TABLE substitution_room;
+
+DROP TABLE substitution_subject;
+
+DROP TABLE substitution_teacher;
+
+DROP TABLE substitution_class;
+
+DROP TABLE substitutions;
+
+DROP TYPE substitution_type;
+
+DROP TABLE timegrid_time_unit;
+
+DROP TABLE timegrid_days;
+
+DROP TABLE timegrids;
+
+DROP TABLE holidays;
+
+DROP TABLE departments;
+
+DROP TABLE rooms;
+
+DROP TABLE subjects;
+
+DROP TABLE classes;
+
+DROP TABLE teachers;
+
+DROP TABLE tenants;
+
+DROP TABLE schoolyears;
\ No newline at end of file
diff --git a/backend/migrations/2022-12-03-124501_init/up.sql b/backend/migrations/2022-12-03-124501_init/up.sql
new file mode 100644
index 0000000..610af28
--- /dev/null
+++ b/backend/migrations/2022-12-03-124501_init/up.sql
@@ -0,0 +1,199 @@
+CREATE TABLE schoolyears(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  name VARCHAR NOT NULL,
+  start_date DATE NOT NULL,
+  end_date DATE NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE tenants(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  active BOOLEAN NOT NULL DEFAULT FALSE,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE UNIQUE INDEX ON tenants(active)
+WHERE
+  active;
+
+CREATE TABLE teachers(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  forename VARCHAR,
+  display_name VARCHAR NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE classes(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  long_name VARCHAR NOT NULL,
+  active BOOLEAN NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE subjects(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  long_name VARCHAR NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE rooms(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  long_name VARCHAR NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE departments(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  long_name VARCHAR NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE holidays(
+  id SERIAL PRIMARY KEY,
+  untis_id INTEGER NOT NULL UNIQUE,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  name VARCHAR NOT NULL,
+  long_name VARCHAR NOT NULL,
+  start_date DATE NOT NULL,
+  end_date DATE NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE timegrids(
+  id SERIAL PRIMARY KEY,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE timegrid_days(
+  id SERIAL PRIMARY KEY,
+  timegrid_id INTEGER NOT NULL REFERENCES timegrids(id),
+  day_index SMALLINT NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE timegrid_time_unit(
+  id SERIAL PRIMARY KEY,
+  timegrid_day_id INTEGER NOT NULL REFERENCES timegrid_days(id),
+  start_time TIME NOT NULL,
+  end_time TIME NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TYPE substitution_type AS ENUM (
+  'cancel',
+  'subst',
+  'add',
+  'shift',
+  'rmchg',
+  'rmlk',
+  'bs',
+  'oh',
+  'sb',
+  'other',
+  'free',
+  'exam',
+  'ac',
+  'holi',
+  'stxt'
+);
+
+CREATE TABLE substitutions(
+  id SERIAL PRIMARY KEY,
+  subst_type substitution_type NOT NULL,
+  lesson_id INTEGER NOT NULL,
+  start_time TIME NOT NULL,
+  end_time TIME NOT NULL,
+  text VARCHAR,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_classes(
+  id SERIAL PRIMARY KEY,
+  substitution_id INTEGER NOT NULL REFERENCES substitutions(id),
+  class_id INTEGER NOT NULL REFERENCES classes(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_teachers(
+  id SERIAL PRIMARY KEY,
+  substitution_id INTEGER NOT NULL REFERENCES substitutions(id),
+  teacher_id INTEGER NOT NULL REFERENCES teachers(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_subjects(
+  id SERIAL PRIMARY KEY,
+  substitution_id INTEGER NOT NULL REFERENCES substitutions(id),
+  subject_id INTEGER NOT NULL REFERENCES subjects(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_rooms(
+  id SERIAL PRIMARY KEY,
+  substitution_id INTEGER NOT NULL REFERENCES substitutions(id),
+  room_id INTEGER NOT NULL REFERENCES rooms(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_planned_queries(
+  id SERIAL PRIMARY KEY,
+  schoolyear_id INTEGER NOT NULL REFERENCES schoolyears(id),
+  date DATE NOT NULL UNIQUE,
+  active BOOLEAN NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE INDEX ON substitution_planned_queries(active);
+
+CREATE TABLE substitution_queries(
+  id SERIAL PRIMARY KEY,
+  substitution_planned_query_id INTEGER NOT NULL REFERENCES substitution_planned_queries(id),
+  queried_at TIMESTAMP NOT NULL,
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
+
+CREATE TABLE substitution_query_results(
+  id SERIAL PRIMARY KEY,
+  substitution_query_id INTEGER NOT NULL REFERENCES substitution_queries(id),
+  substitution_id INTEGER NOT NULL REFERENCES substitutions(id),
+  created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP
+);
\ No newline at end of file
diff --git a/backend/run.sh b/backend/run.sh
new file mode 100644
index 0000000..5f48551
--- /dev/null
+++ b/backend/run.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+DATABASE_URL="$BACKEND_DB_URL" diesel setup \
+  --migration-dir ./migrations \
+  --locked-schema &&
+  RUST_BACKTRACE=full "./bin/$1"
diff --git a/backend/src/bin/api.rs b/backend/src/bin/api.rs
new file mode 100644
index 0000000..5f9522f
--- /dev/null
+++ b/backend/src/bin/api.rs
@@ -0,0 +1,55 @@
+#[cfg(not(target_env = "msvc"))]
+use tikv_jemallocator::Jemalloc;
+
+#[cfg(not(target_env = "msvc"))]
+#[global_allocator]
+static GLOBAL: Jemalloc = Jemalloc;
+
+async fn graphql_route(
+    req: actix_web::HttpRequest,
+    payload: actix_web::web::Payload,
+    schema: actix_web::web::Data<backend::graphql::Schema>,
+) -> Result<actix_web::HttpResponse, actix_web::Error> {
+    juniper_actix::graphql_handler(
+        &schema,
+        &backend::graphql::Context {
+            pool: backend::db::POOL.clone(),
+        },
+        req,
+        payload,
+    )
+    .await
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    std::env::set_var("RUST_LOG", "info");
+    env_logger::init();
+
+    let server = actix_web::HttpServer::new(move || {
+        actix_web::App::new()
+            .app_data(actix_web::web::Data::new(backend::graphql::schema()))
+            .wrap(
+                actix_cors::Cors::default()
+                    .allow_any_origin()
+                    .allowed_methods(vec!["POST", "GET"])
+                    .allowed_headers(vec![
+                        actix_web::http::header::AUTHORIZATION,
+                        actix_web::http::header::ACCEPT,
+                    ])
+                    .allowed_header(actix_web::http::header::CONTENT_TYPE)
+                    .supports_credentials()
+                    .max_age(3600),
+            )
+            .wrap(actix_web::middleware::Compress::default())
+            .wrap(actix_web::middleware::Logger::default())
+            .service(
+                actix_web::web::resource("/")
+                    .route(actix_web::web::post().to(graphql_route))
+                    .route(actix_web::web::get().to(graphql_route)),
+            )
+    });
+    println!("Starting server on port 80!");
+
+    server.bind("0.0.0.0:80")?.run().await
+}
diff --git a/backend/src/bin/worker.rs b/backend/src/bin/worker.rs
new file mode 100644
index 0000000..d500dc4
--- /dev/null
+++ b/backend/src/bin/worker.rs
@@ -0,0 +1,37 @@
+use std::thread;
+#[cfg(not(target_env = "msvc"))]
+use tikv_jemallocator::Jemalloc;
+
+#[cfg(not(target_env = "msvc"))]
+#[global_allocator]
+static GLOBAL: Jemalloc = Jemalloc;
+
+#[tokio::main]
+async fn main() {
+    std::env::set_var("RUST_LOG", "info");
+    env_logger::init();
+
+    println!("Starting worker!");
+
+    backend::worker::init_blocking();
+
+    thread::spawn(|| {
+        tokio::runtime::Runtime::new().unwrap().block_on(async {
+            backend::worker::beat()
+                .await
+                .unwrap()
+                .start()
+                .await
+                .unwrap();
+            println!("asdnkjndfkjlewnflj");
+        });
+    });
+
+    let app = backend::worker::APP.lock().unwrap();
+    let app = app.as_ref().unwrap();
+
+    app.display_pretty().await;
+    app.consume_from(&[backend::worker::QUEUE_NAME])
+        .await
+        .unwrap();
+}
diff --git a/backend/src/config.rs b/backend/src/config.rs
new file mode 100644
index 0000000..27dd549
--- /dev/null
+++ b/backend/src/config.rs
@@ -0,0 +1,30 @@
+use envconfig::Envconfig;
+use lazy_static::lazy_static;
+
+#[derive(Envconfig, Debug)]
+pub struct Config {
+    #[envconfig(from = "BACKEND_DB_URL")]
+    pub db_url: String,
+
+    #[envconfig(from = "BACKEND_AMQP_URL")]
+    pub amqp_url: String,
+
+    #[envconfig(from = "BACKEND_UNTIS_API_URL")]
+    pub untis_api_url: String,
+
+    #[envconfig(from = "BACKEND_UNTIS_RPC_URL")]
+    pub untis_rpc_url: String,
+
+    #[envconfig(from = "BACKEND_UNTIS_SCHOOL")]
+    pub untis_school: String,
+
+    #[envconfig(from = "BACKEND_UNTIS_USERNAME")]
+    pub untis_username: String,
+
+    #[envconfig(from = "BACKEND_UNTIS_PASSWORD")]
+    pub untis_password: String,
+}
+
+lazy_static! {
+    pub static ref CONFIG: Config = Config::init_from_env().unwrap();
+}
diff --git a/backend/src/db/mod.rs b/backend/src/db/mod.rs
new file mode 100644
index 0000000..53fa54b
--- /dev/null
+++ b/backend/src/db/mod.rs
@@ -0,0 +1,28 @@
+use anyhow::Result;
+use diesel::pg::PgConnection;
+use diesel::prelude::*;
+use diesel::r2d2::{ConnectionManager, Pool};
+use lazy_static::lazy_static;
+
+use crate::config;
+
+pub mod models;
+pub mod schema;
+
+pub type DbPool = Pool<ConnectionManager<PgConnection>>;
+
+pub fn establish_connection() -> ConnectionResult<PgConnection> {
+    PgConnection::establish(&config::CONFIG.db_url)
+}
+
+pub fn pool() -> Result<DbPool> {
+    Ok(
+        Pool::builder().build(ConnectionManager::<PgConnection>::new(
+            &config::CONFIG.db_url,
+        ))?,
+    )
+}
+
+lazy_static! {
+    pub static ref POOL: DbPool = pool().unwrap();
+}
diff --git a/backend/src/db/models.rs b/backend/src/db/models.rs
new file mode 100644
index 0000000..d98e29e
--- /dev/null
+++ b/backend/src/db/models.rs
@@ -0,0 +1,446 @@
+use chrono::prelude::*;
+use diesel::prelude::*;
+use std::io::Write;
+
+use crate::db::schema;
+use crate::untis;
+
+#[derive(Identifiable, Queryable, Debug)]
+#[diesel(table_name = schema::schoolyears)]
+pub struct Schoolyear {
+    pub id: i32,
+    pub untis_id: i32,
+    pub name: String,
+    pub start_date: NaiveDate,
+    pub end_date: NaiveDate,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::schoolyears)]
+pub struct NewSchoolyear<'a> {
+    pub untis_id: i32,
+    pub name: &'a str,
+    pub start_date: NaiveDate,
+    pub end_date: NaiveDate,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::tenants)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Tenant {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub active: bool,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::tenants)]
+pub struct NewTenant<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub active: bool,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::teachers)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Teacher {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub forename: Option<String>,
+    pub display_name: String,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::teachers)]
+pub struct NewTeacher<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub forename: Option<&'a str>,
+    pub display_name: &'a str,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::classes)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Class {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub long_name: String,
+    pub active: bool,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::classes)]
+pub struct NewClass<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub long_name: &'a str,
+    pub active: bool,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::subjects)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Subject {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub long_name: String,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::subjects)]
+pub struct NewSubject<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub long_name: &'a str,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::rooms)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Room {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub long_name: String,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::rooms)]
+pub struct NewRoom<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub long_name: &'a str,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::departments)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Department {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub long_name: String,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::departments)]
+pub struct NewDepartment<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub long_name: &'a str,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::holidays)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct Holiday {
+    pub id: i32,
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: String,
+    pub long_name: String,
+    pub start_date: NaiveDate,
+    pub end_date: NaiveDate,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::holidays)]
+pub struct NewHoliday<'a> {
+    pub untis_id: i32,
+    pub schoolyear_id: i32,
+    pub name: &'a str,
+    pub long_name: &'a str,
+    pub start_date: NaiveDate,
+    pub end_date: NaiveDate,
+}
+
+#[derive(diesel::FromSqlRow, diesel::AsExpression, PartialEq, Eq, Debug)]
+#[diesel(sql_type = schema::sql_types::SubstitutionType)]
+pub enum SubstitutionType {
+    Cancel,
+    Substitution,
+    Additional,
+    Shifted,
+    RoomChange,
+    Locked,
+    BreakSupervision,
+    OfficeHour,
+    Standby,
+    Other,
+    Free,
+    Exam,
+    Activity,
+    Holiday,
+    Text,
+}
+
+impl diesel::serialize::ToSql<schema::sql_types::SubstitutionType, diesel::pg::Pg>
+    for SubstitutionType
+{
+    fn to_sql<'b>(
+        &'b self,
+        out: &mut diesel::serialize::Output<'b, '_, diesel::pg::Pg>,
+    ) -> diesel::serialize::Result {
+        match *self {
+            Self::Cancel => out.write_all(b"cancel")?,
+            Self::Substitution => out.write_all(b"subst")?,
+            Self::Additional => out.write_all(b"add")?,
+            Self::Shifted => out.write_all(b"shift")?,
+            Self::RoomChange => out.write_all(b"rmchg")?,
+            Self::Locked => out.write_all(b"rmlk")?,
+            Self::BreakSupervision => out.write_all(b"bs")?,
+            Self::OfficeHour => out.write_all(b"oh")?,
+            Self::Standby => out.write_all(b"sb")?,
+            Self::Other => out.write_all(b"other")?,
+            Self::Free => out.write_all(b"free")?,
+            Self::Exam => out.write_all(b"exam")?,
+            Self::Activity => out.write_all(b"ac")?,
+            Self::Holiday => out.write_all(b"holi")?,
+            Self::Text => out.write_all(b"stxt")?,
+        }
+
+        Ok(diesel::serialize::IsNull::No)
+    }
+}
+
+impl diesel::deserialize::FromSql<schema::sql_types::SubstitutionType, diesel::pg::Pg>
+    for SubstitutionType
+{
+    fn from_sql(
+        bytes: diesel::backend::RawValue<'_, diesel::pg::Pg>,
+    ) -> diesel::deserialize::Result<Self> {
+        match bytes.as_bytes() {
+            b"cancel" => Ok(Self::Cancel),
+            b"subst" => Ok(Self::Substitution),
+            b"add" => Ok(Self::Additional),
+            b"shift" => Ok(Self::Shifted),
+            b"rmchg" => Ok(Self::RoomChange),
+            b"rmlk" => Ok(Self::Locked),
+            b"bs" => Ok(Self::BreakSupervision),
+            b"oh" => Ok(Self::OfficeHour),
+            b"sb" => Ok(Self::Standby),
+            b"other" => Ok(Self::Other),
+            b"free" => Ok(Self::Free),
+            b"exam" => Ok(Self::Exam),
+            b"ac" => Ok(Self::Activity),
+            b"holi" => Ok(Self::Holiday),
+            b"stxt" => Ok(Self::Text),
+            _ => Err("Unrecognized enum variant".into()),
+        }
+    }
+}
+
+impl From<untis::RpcSubstitionType> for SubstitutionType {
+    fn from(x: untis::RpcSubstitionType) -> Self {
+        match x {
+            untis::RpcSubstitionType::Cancel => Self::Cancel,
+            untis::RpcSubstitionType::Substitution => Self::Substitution,
+            untis::RpcSubstitionType::Additional => Self::Additional,
+            untis::RpcSubstitionType::Shifted => Self::Shifted,
+            untis::RpcSubstitionType::RoomChange => Self::RoomChange,
+            untis::RpcSubstitionType::Locked => Self::Locked,
+            untis::RpcSubstitionType::BreakSupervision => Self::BreakSupervision,
+            untis::RpcSubstitionType::OfficeHour => Self::OfficeHour,
+            untis::RpcSubstitionType::Standby => Self::Standby,
+            untis::RpcSubstitionType::Other => Self::Other,
+            untis::RpcSubstitionType::Free => Self::Free,
+            untis::RpcSubstitionType::Exam => Self::Exam,
+            untis::RpcSubstitionType::Activity => Self::Activity,
+            untis::RpcSubstitionType::Holiday => Self::Holiday,
+            untis::RpcSubstitionType::Text => Self::Text,
+        }
+    }
+}
+
+#[derive(Identifiable, Queryable, Debug)]
+#[diesel(table_name = schema::substitutions)]
+pub struct Substitution {
+    pub id: i32,
+    pub substitution_query_id: i32,
+    pub subst_type: SubstitutionType,
+    pub lesson_id: i32,
+    pub start_time: NaiveTime,
+    pub end_time: NaiveTime,
+    pub text: Option<String>,
+    pub active: bool,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitutions)]
+pub struct NewSubstitution<'a> {
+    pub subst_type: SubstitutionType,
+    pub lesson_id: i32,
+    pub start_time: NaiveTime,
+    pub end_time: NaiveTime,
+    pub text: Option<&'a str>,
+    pub active: bool,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_classes)]
+#[diesel(belongs_to(Substitution))]
+#[diesel(belongs_to(Class))]
+pub struct SubstitutionClass {
+    pub id: i32,
+    pub substitution_id: i32,
+    pub class_id: i32,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_classes)]
+pub struct NewSubstitutionClass {
+    pub substitution_id: i32,
+    pub class_id: i32,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_teachers)]
+#[diesel(belongs_to(Substitution))]
+#[diesel(belongs_to(Teacher))]
+pub struct SubstitutionTeacher {
+    pub id: i32,
+    pub substitution_id: i32,
+    pub teacher_id: i32,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_teachers)]
+pub struct NewSubstitutionTeacher {
+    pub substitution_id: i32,
+    pub teacher_id: i32,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_subjects)]
+#[diesel(belongs_to(Substitution))]
+#[diesel(belongs_to(Subject))]
+pub struct SubstitutionSubject {
+    pub id: i32,
+    pub substitution_id: i32,
+    pub subject_id: i32,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_subjects)]
+pub struct NewSubstitutionSubject {
+    pub substitution_id: i32,
+    pub subject_id: i32,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_rooms)]
+#[diesel(belongs_to(Substitution))]
+#[diesel(belongs_to(Room))]
+pub struct SubstitutionRoom {
+    pub id: i32,
+    pub substitution_id: i32,
+    pub room_id: i32,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_rooms)]
+pub struct NewSubstitutionRoom {
+    pub substitution_id: i32,
+    pub room_id: i32,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_planned_queries)]
+#[diesel(belongs_to(Schoolyear))]
+pub struct SubstitutionPlannedQuery {
+    pub id: i32,
+    pub schoolyear_id: i32,
+    pub date: NaiveDate,
+    pub active: bool,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_planned_queries)]
+pub struct NewSubstitutionPlannedQuery {
+    pub schoolyear_id: i32,
+    pub date: NaiveDate,
+    pub active: bool,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_queries)]
+#[diesel(belongs_to(SubstitutionPlannedQuery))]
+pub struct SubstitutionQuery {
+    pub id: i32,
+    pub substitution_planned_query_id: i32,
+    pub queried_at: NaiveDateTime,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_queries)]
+pub struct NewSubstitutionQuery {
+    pub substitution_planned_query_id: i32,
+    pub queried_at: NaiveDateTime,
+}
+
+#[derive(Identifiable, Queryable, Associations, Debug)]
+#[diesel(table_name = schema::substitution_query_results)]
+#[diesel(belongs_to(SubstitutionQuery))]
+#[diesel(belongs_to(Substitution))]
+pub struct SubstitutionQueryResult {
+    pub id: i32,
+    pub substitution_query_id: i32,
+    pub substitution_id: i32,
+    pub created_at: NaiveDateTime,
+    pub updated_at: Option<NaiveDateTime>,
+}
+
+#[derive(Insertable, Debug)]
+#[diesel(table_name = schema::substitution_query_results)]
+pub struct NewSubstitutionQueryResult {
+    pub substitution_query_id: i32,
+    pub substitution_id: i32,
+}
diff --git a/backend/src/db/schema.rs b/backend/src/db/schema.rs
new file mode 100644
index 0000000..c904a19
--- /dev/null
+++ b/backend/src/db/schema.rs
@@ -0,0 +1,225 @@
+pub mod sql_types {
+    #[derive(diesel::sql_types::SqlType)]
+    #[diesel(postgres_type(name = "substitution_type"))]
+    pub struct SubstitutionType;
+}
+
+diesel::table! {
+    schoolyears {
+        id -> Integer,
+        untis_id -> Integer,
+        name -> VarChar,
+        start_date -> Date,
+        end_date -> Date,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    tenants {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        active -> Bool,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    teachers {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        forename -> Nullable<VarChar>,
+        display_name -> VarChar,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    classes {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        long_name -> VarChar,
+        active -> Bool,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    subjects {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        long_name -> VarChar,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    rooms {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        long_name -> VarChar,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    departments {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        long_name -> VarChar,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    holidays {
+        id -> Integer,
+        untis_id -> Integer,
+        schoolyear_id -> Integer,
+        name -> VarChar,
+        long_name -> VarChar,
+        start_date -> Date,
+        end_date -> Date,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    timegrids {
+        id -> Integer,
+        schoolyear_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    timegrid_days {
+        id -> Integer,
+        timegrid_id -> Integer,
+        #[sql_name = "day_index"]
+        day -> SmallInt,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    timegrid_time_unit {
+        id -> Integer,
+        timegrid_id -> Integer,
+        start_time -> Time,
+        end_time -> Time,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    use diesel::sql_types::*;
+
+    use super::sql_types::SubstitutionType;
+
+    substitutions {
+        id -> Integer,
+        subst_type -> SubstitutionType,
+        lesson_id -> Integer,
+        start_time -> Time,
+        end_time -> Time,
+        text -> Nullable<VarChar>,
+        active -> Bool,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_classes {
+        id -> Integer,
+        substitution_id -> Integer,
+        class_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_teachers {
+        id -> Integer,
+        substitution_id -> Integer,
+        teacher_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_subjects {
+        id -> Integer,
+        substitution_id -> Integer,
+        subject_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_rooms {
+        id -> Integer,
+        substitution_id -> Integer,
+        room_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_planned_queries {
+        id -> Integer,
+        schoolyear_id -> Integer,
+        date -> Date,
+        active -> Bool,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_queries {
+        id -> Integer,
+        substitution_planned_query_id -> Integer,
+        queried_at -> Timestamp,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
+
+diesel::table! {
+    substitution_query_results {
+        id -> Integer,
+        substitution_query_id -> Integer,
+        substitution_id -> Integer,
+        created_at -> Timestamp,
+        updated_at -> Nullable<Timestamp>,
+    }
+}
diff --git a/backend/src/graphql.rs b/backend/src/graphql.rs
new file mode 100644
index 0000000..59cbe91
--- /dev/null
+++ b/backend/src/graphql.rs
@@ -0,0 +1,75 @@
+use juniper::{graphql_object, EmptyMutation, EmptySubscription, FieldResult, RootNode};
+
+use crate::config;
+use crate::db;
+
+#[derive(Clone, Debug)]
+pub struct Context {
+    pub pool: db::DbPool,
+}
+
+impl juniper::Context for Context {}
+
+#[derive(Clone, Debug)]
+
+pub struct Config;
+
+#[graphql_object(context = Context)]
+impl Config {
+    fn name(&self) -> &str {
+        "BVplan"
+    }
+
+    fn school(&self) -> &str {
+        &config::CONFIG.untis_school
+    }
+
+    fn version(&self) -> &str {
+        env!("CARGO_PKG_VERSION")
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Teacher {
+    pub id: i32,
+    pub display_name: String,
+}
+
+#[graphql_object(context = Context)]
+impl Teacher {
+    fn id(&self) -> i32 {
+        self.id
+    }
+
+    fn display_name(&self) -> &str {
+        &self.display_name
+    }
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Query;
+
+#[graphql_object(context = Context)]
+impl Query {
+    fn ping() -> &str {
+        "pong"
+    }
+
+    fn config() -> Config {
+        Config
+    }
+
+    async fn teachers() -> Vec<Teacher> {
+        vec![]
+    }
+}
+
+pub type Schema = RootNode<'static, Query, EmptyMutation<Context>, EmptySubscription<Context>>;
+
+pub fn schema() -> Schema {
+    Schema::new(
+        Query,
+        EmptyMutation::<Context>::new(),
+        EmptySubscription::<Context>::new(),
+    )
+}
diff --git a/backend/src/lib.rs b/backend/src/lib.rs
new file mode 100644
index 0000000..5f89f11
--- /dev/null
+++ b/backend/src/lib.rs
@@ -0,0 +1,5 @@
+pub mod config;
+pub mod db;
+pub mod graphql;
+pub mod untis;
+pub mod worker;
diff --git a/backend/src/untis.rs b/backend/src/untis.rs
new file mode 100644
index 0000000..4760420
--- /dev/null
+++ b/backend/src/untis.rs
@@ -0,0 +1,717 @@
+use anyhow::{bail, Context, Result};
+use chrono::Datelike;
+use cookie::Cookie;
+use serde::Deserialize;
+use serde_json::json;
+
+pub const CLIENT_NAME: &str = "BVplan@OHG-Furtwangen";
+
+fn deserialize_date<'de, D>(deserializer: D) -> Result<chrono::NaiveDate, D::Error>
+where
+    D: serde::de::Deserializer<'de>,
+{
+    struct Visitor;
+
+    impl<'de> serde::de::Visitor<'de> for Visitor {
+        type Value = chrono::NaiveDate;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            formatter.write_str("a naive date serialized as an unsigned integer")
+        }
+
+        fn visit_u64<E>(self, mut v: u64) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            let y = (v / 10000) as i32;
+            v %= 10000;
+            let m = (v / 100) as u32;
+            v %= 100;
+
+            match chrono::NaiveDate::from_ymd_opt(y, m, v as u32) {
+                Some(x) => Ok(x),
+                None => Err(E::custom(format!("No such date: {}-{}-{}", y, m, v))),
+            }
+        }
+    }
+
+    deserializer.deserialize_u64(Visitor)
+}
+
+fn serialize_date(date: chrono::NaiveDate) -> u64 {
+    date.year() as u64 * 10000 + date.month() as u64 * 100 + date.day() as u64
+}
+
+fn deserialize_time<'de, D>(deserializer: D) -> Result<chrono::NaiveTime, D::Error>
+where
+    D: serde::de::Deserializer<'de>,
+{
+    struct Visitor;
+
+    impl<'de> serde::de::Visitor<'de> for Visitor {
+        type Value = chrono::NaiveTime;
+
+        fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+            formatter.write_str("a naive time serialized as an unsigned integer")
+        }
+
+        fn visit_u64<E>(self, mut v: u64) -> Result<Self::Value, E>
+        where
+            E: serde::de::Error,
+        {
+            let h = v / 100;
+            v %= 100;
+
+            match chrono::NaiveTime::from_hms_opt(h as u32, v as u32, 0) {
+                Some(x) => Ok(x),
+                None => Err(E::custom(format!("No such time: {}:{}", h, v))),
+            }
+        }
+    }
+
+    deserializer.deserialize_u64(Visitor)
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcError {
+    pub message: String,
+    pub code: i32,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcResponse<T> {
+    pub jsonrpc: String,
+    pub id: String,
+    pub result: Option<T>,
+    pub error: Option<RpcError>,
+}
+
+#[derive(Deserialize, Debug)]
+struct RpcEmptyResult;
+
+#[derive(Deserialize, Debug)]
+pub struct RpcLogin {
+    #[serde(rename = "sessionId")]
+    pub session_id: String,
+    #[serde(rename = "personType")]
+    pub person_type: i32,
+    #[serde(rename = "personId")]
+    pub person_id: i32,
+    #[serde(rename = "klasseId")]
+    pub class_id: i32,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcClass {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+    pub active: bool,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcSubject {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcRoom {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcDepartment {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcHoliday {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+    #[serde(rename = "startDate", deserialize_with = "deserialize_date")]
+    pub start_date: chrono::NaiveDate,
+    #[serde(rename = "endDate", deserialize_with = "deserialize_date")]
+    pub end_date: chrono::NaiveDate,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcTimegridDayTimeUnit {
+    #[serde(rename = "startTime", deserialize_with = "deserialize_time")]
+    pub start_time: chrono::NaiveTime,
+    #[serde(rename = "endTime", deserialize_with = "deserialize_time")]
+    pub end_time: chrono::NaiveTime,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcTimegridDay {
+    pub day: u8,
+    #[serde(rename = "timeUnits")]
+    pub time_units: Vec<RpcTimegridDayTimeUnit>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcSchoolyear {
+    pub id: i32,
+    pub name: String,
+    #[serde(rename = "startDate", deserialize_with = "deserialize_date")]
+    pub start_date: chrono::NaiveDate,
+    #[serde(rename = "endDate", deserialize_with = "deserialize_date")]
+    pub end_date: chrono::NaiveDate,
+}
+
+#[derive(Deserialize, Clone, Copy, Debug)]
+pub enum RpcSubstitionType {
+    #[serde(rename = "cancel")]
+    Cancel,
+    #[serde(rename = "subst")]
+    Substitution,
+    #[serde(rename = "add")]
+    Additional,
+    #[serde(rename = "shift")]
+    Shifted,
+    #[serde(rename = "rmchg")]
+    RoomChange,
+    #[serde(rename = "rmlk")]
+    Locked,
+    #[serde(rename = "bs")]
+    BreakSupervision,
+    #[serde(rename = "oh")]
+    OfficeHour,
+    #[serde(rename = "sb")]
+    Standby,
+    #[serde(rename = "other")]
+    Other,
+    #[serde(rename = "free")]
+    Free,
+    #[serde(rename = "exam")]
+    Exam,
+    #[serde(rename = "ac")]
+    Activity,
+    #[serde(rename = "holi")]
+    Holiday,
+    #[serde(rename = "stxt")]
+    Text,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcSubstitutionId {
+    pub id: i32,
+    pub name: Option<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcSubstitutionReschedule {
+    #[serde(deserialize_with = "deserialize_date")]
+    pub date: chrono::NaiveDate,
+    #[serde(rename = "startTime", deserialize_with = "deserialize_time")]
+    pub start_time: chrono::NaiveTime,
+    #[serde(rename = "endTime", deserialize_with = "deserialize_time")]
+    pub end_time: chrono::NaiveTime,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct RpcSubstitution {
+    #[serde(rename = "type")]
+    pub subst_type: RpcSubstitionType,
+    #[serde(rename = "lsid")]
+    pub lesson_id: i32,
+    #[serde(rename = "startTime", deserialize_with = "deserialize_time")]
+    pub start_time: chrono::NaiveTime,
+    #[serde(rename = "endTime", deserialize_with = "deserialize_time")]
+    pub end_time: chrono::NaiveTime,
+    #[serde(rename = "txt")]
+    pub text: Option<String>,
+    #[serde(rename = "kl")]
+    pub classes: Vec<RpcSubstitutionId>,
+    #[serde(rename = "te")]
+    pub teachers: Vec<RpcSubstitutionId>,
+    #[serde(rename = "su")]
+    pub subjects: Vec<RpcSubstitutionId>,
+    #[serde(rename = "ro")]
+    pub rooms: Vec<RpcSubstitutionId>,
+    pub reschedule: Option<RpcSubstitutionReschedule>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ApiTenant {
+    pub id: i32,
+    #[serde(rename = "displayName")]
+    pub display_name: String,
+}
+
+#[derive(Deserialize, Debug)]
+struct ApiDataResponse {
+    tenant: ApiTenant,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct ApiTeacher {
+    pub id: i32,
+    pub name: String,
+    pub forename: String,
+    #[serde(rename = "longName")]
+    pub long_name: String,
+    #[serde(rename = "displayname")]
+    pub display_name: String,
+}
+
+#[derive(Deserialize, Debug)]
+struct ApiTeachersResponseData {
+    elements: Vec<ApiTeacher>,
+}
+
+#[derive(Deserialize, Debug)]
+struct ApiTeachersResponse {
+    data: ApiTeachersResponseData,
+}
+
+#[derive(Debug)]
+pub struct Client {
+    pub api_url: url::Url,
+    pub rpc_url: url::Url,
+    pub username: String,
+    pub password: String,
+    pub session: Option<String>,
+    pub authorization: Option<String>,
+}
+
+impl Client {
+    pub fn gen_rpc_url(mut endpoint: url::Url, school: &str) -> url::Url {
+        endpoint.query_pairs_mut().append_pair("school", school);
+
+        endpoint
+    }
+
+    pub async fn login_rpc(&mut self) -> Result<RpcLogin> {
+        let resp: RpcResponse<RpcLogin> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .json(&json!({
+                "id": "ID",
+                "method": "authenticate",
+                "params": {
+                    "user": self.username,
+                    "password": self.password,
+                    "client": CLIENT_NAME,
+                },
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        self.session = Some(
+            Cookie::new(
+                "JSESSIONID",
+                &resp
+                    .result
+                    .as_ref()
+                    .context("Result null event though error not")?
+                    .session_id,
+            )
+            .to_string(),
+        );
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn login_api(&mut self) -> Result<String> {
+        let jwt = reqwest::Client::new()
+            .get(self.api_url.join("token/new")?)
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .send()
+            .await?
+            .text()
+            .await?;
+        self.authorization = Some(jwt.to_string());
+
+        Ok(jwt)
+    }
+
+    pub async fn login(&mut self) -> Result<()> {
+        self.login_rpc().await?;
+        self.login_api().await?;
+
+        Ok(())
+    }
+
+    pub async fn logout(&mut self) -> Result<()> {
+        let resp: RpcResponse<RpcEmptyResult> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "logout",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        self.session = None;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        Ok(())
+    }
+
+    pub async fn classes(&self) -> Result<Vec<RpcClass>> {
+        let resp: RpcResponse<Vec<RpcClass>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getKlassen",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn subjects(&self) -> Result<Vec<RpcSubject>> {
+        let resp: RpcResponse<Vec<RpcSubject>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getSubjects",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn rooms(&self) -> Result<Vec<RpcRoom>> {
+        let resp: RpcResponse<Vec<RpcRoom>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getRooms",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn departments(&self) -> Result<Vec<RpcDepartment>> {
+        let resp: RpcResponse<Vec<RpcDepartment>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getDepartments",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn holidays(&self) -> Result<Vec<RpcHoliday>> {
+        let resp: RpcResponse<Vec<RpcHoliday>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getHolidays",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn timegrid(&self) -> Result<Vec<RpcTimegridDay>> {
+        let resp: RpcResponse<Vec<RpcTimegridDay>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getTimegridUnits",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn current_schoolyear(&self) -> Result<RpcSchoolyear> {
+        let resp: RpcResponse<RpcSchoolyear> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getCurrentSchoolyear",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn schoolyears(&self) -> Result<Vec<RpcSchoolyear>> {
+        let resp: RpcResponse<Vec<RpcSchoolyear>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getSchoolyears",
+                "params": {},
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub async fn substitutions(
+        &self,
+        from: &chrono::NaiveDate,
+        to: &chrono::NaiveDate,
+        department: Option<i32>,
+    ) -> Result<Vec<RpcSubstitution>> {
+        let resp: RpcResponse<Vec<RpcSubstitution>> = reqwest::Client::new()
+            .get(self.rpc_url.as_str())
+            .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .header(reqwest::header::ACCEPT, "application/json-rpc")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .json(&json!({
+                "id": "ID",
+                "method": "getSubstitutions",
+                "params": {
+                    "startDate": serialize_date(*from),
+                    "endDate": serialize_date(*to),
+                    "departmentId": department.map_or(0, |d| d)
+                },
+                "jsonrpc": "2.0"
+            }))
+            .send()
+            .await?
+            .json()
+            .await?;
+        if let Some(e) = resp.error {
+            bail!("RPC error: {:?}", e);
+        }
+
+        if let Some(x) = resp.result {
+            Ok(x)
+        } else {
+            bail!("RPC result is null");
+        }
+    }
+
+    pub fn construct_bearer(auth: &str) -> String {
+        format!("Bearer {}", auth)
+    }
+
+    pub async fn current_tenant(&self) -> Result<ApiTenant> {
+        let resp: ApiDataResponse = reqwest::Client::new()
+            .get(self.api_url.join("rest/view/v1/app/data")?)
+            .header(reqwest::header::ACCEPT, "application/json")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .header(
+                reqwest::header::AUTHORIZATION,
+                Client::construct_bearer(&self.authorization.as_ref().context("Not logged in")?),
+            )
+            .send()
+            .await?
+            .json()
+            .await?;
+
+        Ok(resp.tenant)
+    }
+
+    pub async fn teachers(&self) -> Result<Vec<ApiTeacher>> {
+        let mut url = self.api_url.join("public/timetable/weekly/pageconfig")?;
+        url.query_pairs_mut().append_pair("type", "2");
+        let resp: ApiTeachersResponse = reqwest::Client::new()
+            .get(url)
+            .header(reqwest::header::ACCEPT, "application/json")
+            .header(
+                reqwest::header::COOKIE,
+                self.session.as_ref().context("Not logged in")?,
+            )
+            .header(
+                reqwest::header::AUTHORIZATION,
+                Client::construct_bearer(&self.authorization.as_ref().context("Not logged in")?),
+            )
+            .send()
+            .await?
+            .json()
+            .await?;
+
+        Ok(resp.data.elements)
+    }
+
+    pub async fn exams(&self) -> Result<()> {
+        Ok(())
+    }
+}
diff --git a/backend/src/worker/mod.rs b/backend/src/worker/mod.rs
new file mode 100644
index 0000000..3d323cc
--- /dev/null
+++ b/backend/src/worker/mod.rs
@@ -0,0 +1,76 @@
+use celery::beat::DeltaSchedule;
+use celery::broker::AMQPBroker;
+use lazy_static::lazy_static;
+use std::sync::{Arc, Mutex};
+use std::thread;
+use std::time;
+
+use crate::config;
+
+pub mod update_info;
+
+pub const QUEUE_NAME: &str = "celery";
+
+lazy_static! {
+    pub static ref APP: Mutex<Option<Arc<celery::Celery<AMQPBroker>>>> = Mutex::new(None);
+}
+
+#[tokio::main]
+pub async fn init() {
+    *APP.lock().unwrap() = Some(
+        celery::app!(
+            broker = AMQPBroker { &config::CONFIG.amqp_url },
+            tasks = [
+                update_info::update_info,
+            ],
+            task_routes = [
+                "*" => QUEUE_NAME,
+            ],
+            prefetch_count = 2,
+            heartbeat = Some(10)
+        )
+        .await
+        .unwrap(),
+    );
+}
+
+pub fn init_blocking() {
+    thread::spawn(|| {
+        tokio::runtime::Runtime::new().unwrap().spawn_blocking(init);
+    });
+
+    let dur = time::Duration::from_secs(1);
+    let mut i = 0;
+    loop {
+        if APP.lock().unwrap().is_some() {
+            break;
+        }
+        thread::sleep(dur);
+        i += 1;
+
+        if i >= 10 {
+            panic!("Worker not initialized after 10 seconds!");
+        }
+    }
+}
+
+pub fn beat() -> impl std::future::Future<
+    Output = Result<
+        celery::beat::Beat<AMQPBroker, celery::beat::LocalSchedulerBackend>,
+        celery::error::BeatError,
+    >,
+> {
+    celery::beat!(
+        broker = AMQPBroker { &config::CONFIG.amqp_url },
+        tasks = [
+            "update_info_" => {
+                update_info::update_info,
+                schedule = DeltaSchedule::new(time::Duration::from_secs(60)),
+                args = (),
+            }
+        ],
+        task_routes = [
+            "*" => QUEUE_NAME,
+        ]
+    )
+}
diff --git a/backend/src/worker/update_info.rs b/backend/src/worker/update_info.rs
new file mode 100644
index 0000000..871c81a
--- /dev/null
+++ b/backend/src/worker/update_info.rs
@@ -0,0 +1,356 @@
+use anyhow::Result;
+use celery::error::TaskError;
+use celery::task::TaskResult;
+use chrono::prelude::*;
+use diesel::prelude::*;
+use now::DateTimeNow;
+
+use crate::config;
+use crate::db;
+use crate::untis;
+
+async fn fetch_schoolyears(client: &untis::Client, conn: &mut PgConnection) -> Result<i32> {
+    let existing_schoolyears = db::schema::schoolyears::table
+        .select(db::schema::schoolyears::untis_id)
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::schoolyears::table)
+        .values(
+            &client
+                .schoolyears()
+                .await?
+                .iter()
+                .filter(|y| !existing_schoolyears.contains(&y.id))
+                .map(|y| db::models::NewSchoolyear {
+                    untis_id: y.id,
+                    name: &y.name,
+                    start_date: y.start_date,
+                    end_date: y.end_date,
+                })
+                .collect::<Vec<db::models::NewSchoolyear>>(),
+        )
+        .execute(conn)?;
+
+    Ok(db::schema::schoolyears::table
+        .filter(db::schema::schoolyears::untis_id.eq(client.current_schoolyear().await?.id))
+        .select(db::schema::schoolyears::id)
+        .first(conn)?)
+}
+
+async fn fetch_current_tenant(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let tenant = client.current_tenant().await?;
+    if diesel::select(diesel::dsl::not(diesel::expression::exists::exists(
+        db::schema::tenants::table.filter(db::schema::tenants::untis_id.eq(tenant.id)),
+    )))
+    .get_result::<bool>(conn)?
+    {
+        diesel::update(db::schema::tenants::table)
+            .filter(db::schema::tenants::active)
+            .set(db::schema::tenants::active.eq(false))
+            .execute(conn)?;
+        diesel::insert_into(db::schema::tenants::table)
+            .values(db::models::NewTenant {
+                untis_id: tenant.id,
+                schoolyear_id,
+                name: &tenant.display_name,
+                active: true,
+            })
+            .execute(conn)?;
+    } else if diesel::select(diesel::expression::exists::exists(
+        db::schema::tenants::table
+            .filter(db::schema::tenants::untis_id.eq(tenant.id))
+            .filter(db::schema::tenants::active.eq(false)),
+    ))
+    .get_result::<bool>(conn)?
+    {
+        diesel::update(db::schema::tenants::table)
+            .filter(db::schema::tenants::active)
+            .set((
+                db::schema::tenants::active.eq(false),
+                db::schema::tenants::updated_at.eq(diesel::dsl::now),
+            ))
+            .execute(conn)?;
+        diesel::update(db::schema::tenants::table)
+            .filter(db::schema::tenants::untis_id.eq(tenant.id))
+            .set((
+                db::schema::tenants::active.eq(true),
+                db::schema::tenants::updated_at.eq(diesel::dsl::now),
+            ))
+            .execute(conn)?;
+    }
+
+    Ok(())
+}
+
+async fn fetch_teachers(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_teachers = db::schema::teachers::table
+        .select(db::schema::teachers::untis_id)
+        .filter(db::schema::teachers::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::teachers::table)
+        .values(
+            &client
+                .teachers()
+                .await?
+                .iter()
+                .filter(|t| !existing_teachers.contains(&t.id))
+                .map(|t| db::models::NewTeacher {
+                    untis_id: t.id,
+                    schoolyear_id,
+                    name: &t.name,
+                    forename: if t.forename.is_empty() {
+                        None
+                    } else {
+                        Some(&t.forename)
+                    },
+                    display_name: &t.display_name,
+                })
+                .collect::<Vec<db::models::NewTeacher>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_classes(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_classes = db::schema::classes::table
+        .select(db::schema::classes::untis_id)
+        .filter(db::schema::classes::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::classes::table)
+        .values(
+            &client
+                .classes()
+                .await?
+                .iter()
+                .filter(|c| !existing_classes.contains(&c.id))
+                .map(|c| db::models::NewClass {
+                    untis_id: c.id,
+                    schoolyear_id,
+                    name: &c.name,
+                    long_name: &c.long_name,
+                    active: c.active,
+                })
+                .collect::<Vec<db::models::NewClass>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_subjects(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_classes = db::schema::subjects::table
+        .select(db::schema::subjects::untis_id)
+        .filter(db::schema::subjects::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::subjects::table)
+        .values(
+            &client
+                .subjects()
+                .await?
+                .iter()
+                .filter(|c| !existing_classes.contains(&c.id))
+                .map(|c| db::models::NewSubject {
+                    untis_id: c.id,
+                    schoolyear_id,
+                    name: &c.name,
+                    long_name: &c.long_name,
+                })
+                .collect::<Vec<db::models::NewSubject>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_rooms(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_classes = db::schema::rooms::table
+        .select(db::schema::rooms::untis_id)
+        .filter(db::schema::rooms::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::rooms::table)
+        .values(
+            &client
+                .rooms()
+                .await?
+                .iter()
+                .filter(|c| !existing_classes.contains(&c.id))
+                .map(|c| db::models::NewRoom {
+                    untis_id: c.id,
+                    schoolyear_id,
+                    name: &c.name,
+                    long_name: &c.long_name,
+                })
+                .collect::<Vec<db::models::NewRoom>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_departments(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_classes = db::schema::departments::table
+        .select(db::schema::departments::untis_id)
+        .filter(db::schema::departments::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::departments::table)
+        .values(
+            &client
+                .departments()
+                .await?
+                .iter()
+                .filter(|c| !existing_classes.contains(&c.id))
+                .map(|c| db::models::NewDepartment {
+                    untis_id: c.id,
+                    schoolyear_id,
+                    name: &c.name,
+                    long_name: &c.long_name,
+                })
+                .collect::<Vec<db::models::NewDepartment>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_holidays(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let existing_classes = db::schema::holidays::table
+        .select(db::schema::holidays::untis_id)
+        .filter(db::schema::holidays::schoolyear_id.eq(schoolyear_id))
+        .load::<i32>(conn)?;
+    diesel::insert_into(db::schema::holidays::table)
+        .values(
+            &client
+                .holidays()
+                .await?
+                .iter()
+                .filter(|c| !existing_classes.contains(&c.id))
+                .map(|c| db::models::NewHoliday {
+                    untis_id: c.id,
+                    schoolyear_id,
+                    name: &c.name,
+                    long_name: &c.long_name,
+                    start_date: c.start_date,
+                    end_date: c.end_date,
+                })
+                .collect::<Vec<db::models::NewHoliday>>(),
+        )
+        .execute(conn)?;
+
+    Ok(())
+}
+
+async fn fetch_substitutions(
+    client: &untis::Client,
+    conn: &mut PgConnection,
+    schoolyear_id: i32,
+) -> Result<()> {
+    let now = Utc::now();
+    let beginning_of_week = now.beginning_of_week().date_naive();
+    let end_of_week = now.end_of_week().date_naive();
+    // if diesel::select(diesel::dsl::not(diesel::expression::exists::exists(
+    //     db::schema::substitution_queries::table
+    //         .filter(db::schema::substitution_queries::active)
+    //         .filter(db::schema::substitution_queries::end_date.eq(end_of_week)),
+    // )))
+    // .get_result::<bool>(conn)?
+    // {}
+
+    // for query in db::schema::substitution_queries::table
+    //     .filter(db::schema::substitution_queries::active)
+    //     .load::<db::models::SubstitutionQuery>(conn)?
+    // {
+    //     dbg!(&query);
+    // }
+
+    Ok(())
+}
+
+#[celery::task]
+pub async fn update_info() -> TaskResult<()> {
+    let mut client = untis::Client {
+        api_url: match url::Url::parse(&config::CONFIG.untis_api_url) {
+            Ok(x) => x,
+            Err(e) => return Err(TaskError::UnexpectedError(e.to_string())),
+        },
+        rpc_url: match url::Url::parse(&config::CONFIG.untis_rpc_url) {
+            Ok(x) => untis::Client::gen_rpc_url(x, &config::CONFIG.untis_school),
+            Err(e) => return Err(TaskError::UnexpectedError(e.to_string())),
+        },
+        username: config::CONFIG.untis_username.to_owned(),
+        password: config::CONFIG.untis_password.to_owned(),
+        session: None,
+        authorization: None,
+    };
+
+    if let Err(e) = client.login().await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+
+    let conn = &mut match db::POOL.get() {
+        Ok(x) => x,
+        Err(e) => return Err(TaskError::UnexpectedError(e.to_string())),
+    };
+
+    let schoolyear_id = match fetch_schoolyears(&client, conn).await {
+        Ok(x) => x,
+        Err(e) => return Err(TaskError::UnexpectedError(e.to_string())),
+    };
+    if let Err(e) = fetch_current_tenant(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_teachers(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_classes(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_subjects(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_rooms(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_departments(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_holidays(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+    if let Err(e) = fetch_substitutions(&client, conn, schoolyear_id).await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+
+    if let Err(e) = client.logout().await {
+        return Err(TaskError::UnexpectedError(e.to_string()));
+    }
+
+    Ok(())
+}
diff --git a/config/nginx/nginx.conf b/config/nginx/nginx.conf
new file mode 100644
index 0000000..5d3b6a3
--- /dev/null
+++ b/config/nginx/nginx.conf
@@ -0,0 +1,51 @@
+events {
+  worker_connections 1024;
+}
+
+http {
+  server_tokens off;
+  more_clear_headers Server;
+
+  server {
+    # location / {
+    #   proxy_pass http://frontend/;
+    # }
+
+    location /graphql {
+      proxy_pass http://api/;
+      proxy_buffering off;
+      proxy_set_header Host $http_host;
+      proxy_set_header X-Real-IP $remote_addr;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /adminer {
+      proxy_pass http://adminer:8080/;
+      proxy_buffering off;
+      proxy_set_header Host $http_host;
+      proxy_set_header X-Real-IP $remote_addr;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location ~* /rabbitmq/api/(.*?)/(.*) {
+      proxy_pass http://rabbitmq:15672/api/$1/%2F/$2?$query_string;
+      proxy_buffering off;
+      proxy_set_header Host $http_host;
+      proxy_set_header X-Real-IP $remote_addr;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location ~* /rabbitmq/(.*) {
+      rewrite ^/rabbitmq/(.*)$ /$1 break;
+      proxy_pass http://rabbitmq:15672;
+      proxy_buffering off;
+      proxy_set_header Host $http_host;
+      proxy_set_header X-Real-IP $remote_addr;
+      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+      proxy_set_header X-Forwarded-Proto $scheme;
+    }
+  }
+}
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..616230a
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,81 @@
+version: "3"
+
+services:
+  nginx:
+    image: docker.io/byjg/nginx-extras
+    restart: always
+    volumes:
+      - ./config/nginx/nginx.conf:/etc/nginx/nginx.conf:ro
+    ports:
+      - 80:80
+    depends_on:
+      - adminer
+      - rabbitmq
+      - api
+
+  postgres:
+    image: docker.io/postgres:alpine
+    restart: always
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    volumes:
+      - postgres:/var/lib/postgresql/data
+
+  adminer:
+    image: docker.io/adminer:standalone
+    restart: always
+    depends_on:
+      - postgres
+
+  rabbitmq:
+    image: docker.io/rabbitmq:3-management-alpine
+    restart: always
+    environment:
+      RABBITMQ_DEFAULT_USER: ${RABBITMQ_USER}
+      RABBITMQ_DEFAULT_PASS: ${RABBITMQ_PASSWORD}
+    volumes:
+      - rabbitmq:/var/lib/rabbitmq
+
+  worker:
+    image: git.dergrimm.net/dergrimm/bvplan_backend:latest
+    build:
+      context: ./backend
+    restart: always
+    command: worker
+    depends_on:
+      - postgres
+      - rabbitmq
+    environment:
+      BACKEND_DB_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_USER}
+      BACKEND_AMQP_URL: amqp://${RABBITMQ_USER}:${RABBITMQ_PASSWORD}@rabbitmq:5672
+      BACKEND_UNTIS_API_URL: ${BACKEND_UNTIS_API_URL}
+      BACKEND_UNTIS_RPC_URL: ${BACKEND_UNTIS_RPC_URL}
+      BACKEND_UNTIS_SCHOOL: ${BACKEND_UNTIS_SCHOOL}
+      BACKEND_UNTIS_USERNAME: ${BACKEND_UNTIS_USERNAME}
+      BACKEND_UNTIS_PASSWORD: ${BACKEND_UNTIS_PASSWORD}
+
+  api:
+    image: git.dergrimm.net/dergrimm/bvplan_backend:latest
+    build:
+      context: ./backend
+    restart: always
+    command: api
+    depends_on:
+      - postgres
+      - rabbitmq
+      - worker
+    environment:
+      BACKEND_DB_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_USER}
+      BACKEND_AMQP_URL: amqp://${RABBITMQ_USER}:${RABBITMQ_PASSWORD}@rabbitmq:5672
+      BACKEND_UNTIS_API_URL: ${BACKEND_UNTIS_API_URL}
+      BACKEND_UNTIS_RPC_URL: ${BACKEND_UNTIS_RPC_URL}
+      BACKEND_UNTIS_SCHOOL: ${BACKEND_UNTIS_SCHOOL}
+      BACKEND_UNTIS_USERNAME: ${BACKEND_UNTIS_USERNAME}
+      BACKEND_UNTIS_PASSWORD: ${BACKEND_UNTIS_PASSWORD}
+
+volumes:
+  postgres:
+  rabbitmq:
+
+