Working user and link list, (big)restructure

This is now a workspace consisting of:
  * the pslink app (a wasm frontend for the admin interface)
  * the pslink binary
  * shared - modules for communication between the two above.

pslink/migrations/20210318172317_initialmigration.sql

@@ -0,0 +1,31 @@
+-- Add up migration script here
+DROP TABLE IF EXISTS __diesel_schema_migrations;
+
+-- Add migration script here
+CREATE TABLE IF NOT EXISTS users (
+    id INTEGER PRIMARY KEY NOT NULL,
+    username VARCHAR NOT NULL,
+    email VARCHAR NOT NULL,
+    password VARCHAR NOT NULL,
+    role INTEGER DEFAULT 1 NOT NULL,
+    UNIQUE(username),
+    UNIQUE(email)
+);
+
+CREATE TABLE IF NOT EXISTS links (
+    id INTEGER PRIMARY KEY NOT NULL,
+    title VARCHAR NOT NULL,
+    target VARCHAR NOT NULL,
+    code VARCHAR NOT NULL,
+    author INT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    FOREIGN KEY (author) REFERENCES users (id),
+    UNIQUE (code)
+);
+
+CREATE TABLE IF NOT EXISTS clicks (
+    id INTEGER PRIMARY KEY NOT NULL,
+    link INT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    FOREIGN KEY (link) REFERENCES links (id)
+);

pslink/migrations/20210330103013_addinglanguage.sql

@@ -0,0 +1,4 @@
+-- Add migration script here
+
+ALTER TABLE users 
+ADD COLUMN language Text NOT NULL DEFAULT "en";

pslink/migrations/20210401070030_on_delete_cascade.sql

@@ -0,0 +1,24 @@
+-- Add migration script here
+PRAGMA foreign_keys = off;
+
+
+CREATE TABLE new_clicks (
+    id INTEGER PRIMARY KEY NOT NULL,
+    link INT NOT NULL,
+    created_at TIMESTAMP NOT NULL,
+    FOREIGN KEY (link) REFERENCES links (id) ON DELETE CASCADE
+);
+
+INSERT INTO
+    new_clicks
+SELECT
+    *
+FROM
+    clicks;
+
+
+DROP TABLE clicks;
+ALTER TABLE
+    new_clicks RENAME TO clicks;
+    
+PRAGMA foreign_keys = on;