more on readme

README.md

@@ -1,14 +1,48 @@
 # KOreader Sync Server
-This is a KOreader sync server, implemented in Rust. It uses the crates *axum*, *redis*, *serde* and *serde_json*.
+This is a KOreader sync server, implemented in Rust. It uses the crates *axum*, *sqlx*, *serde* and *serde_json*.
 
 ## Requirements
-- Rust toolchain (≥ 1.63) for compilation
-- A running Redis server
+- Rust toolchain for compilation
+- A running PostgreSQL server
 - Nginx (or Apache) webserver as a reverse proxy, since kosyncrs only listens locally and uses HTTP.
 
 ## Installation
-Just compile it with `cargo build --release`. You can then copy the executable for example to `/usr/local/bin/`. If you want to start the service automatically, you can adapt the example systemd file for your needs. You can also use nginx as a reverse proxy, so that the sync server listens on port 443.
+Just compile it with `cargo build --release`. You can then copy the executable for example to `/usr/local/bin/`.
 
-## Todo
-- Test, if it really works, and if it works reliably. Feedback is very welcome!
-- Make it more configurable
+If you want to start the service automatically, you can adapt the example systemd file for your needs. Please pay particularly attention to the PG_URL environment variable.You have to adjust the database username and password.
+
+You can also use nginx as a reverse proxy, so that the sync server listens on port 443. An example file is provided.
+
+### Database setup
+First, create a new database user and set a password:
+```
+$ createuser -P kosync
+```
+
+Then, create a new database which is owned by the newly created user:
+```
+$ createdb -O kosync kosync
+```
+
+Connect to the database (with psql) and create the database tables:
+```sql
+CREATE TABLE users (
+  id BIGSERIAL PRIMARY KEY,
+  username TEXT NOT NULL,
+  password TEXT
+);
+
+CREATE TABLE progresses (
+  id BIGSERIAL PRIMARY KEY,
+  user_id BIGINT,
+  document TEXT UNIQUE NOT NULL,
+  progress TEXT NOT NULL,
+  percentage REAL NOT NULL,
+  device TEXT NOT NULL,
+  device_id TEXT NOT NULL,
+  timestamp BIGINT NOT NULL,
+  FOREIGN KEY (user_id)
+     REFERENCES users(id) ON DELETE CASCADE,
+  UNIQUE (user_id, document)
+);
+```