users: migrations, queries, users crate: create user, get first admin user

crates/database/migrations/20230305135630_users.down.sql

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+drop table if exists users;

crates/database/migrations/20230305135630_users.up.sql

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+create table if not exists users
+(
+    id               TEXT    not null primary key,
+    created_at       TEXT    not null default CURRENT_TIMESTAMP,
+    updated_at       TEXT    not null default CURRENT_TIMESTAMP,
+    is_admin         INTEGER not null,
+    username         TEXT    not null unique,
+    name             TEXT,
+    email            TEXT unique,
+    password         TEXT,
+    password_recover TEXT,
+    paper_key        TEXT,
+    is_archived      INTEGER not null default 0
+);
+
+-- update "updated_at"
+create trigger if not exists users_updated_at
+    after update
+    on users
+    for each row
+begin
+    update users
+    set updated_at = CURRENT_TIMESTAMP
+    where id is NEW.id;
+end;