add working signup + login

internal/database/migrations/1680618019_create_initial_tables.sql

@@ -38,7 +38,31 @@ create table posts (
     visibility post_visibility not null
 );
 
+create table applications (
+    id text primary key,
+    name text not null
+);
+
+create table tokens (
+    id      text primary key,
+    app_id  text not null references applications (id) on delete cascade,
+    user_id text not null references accounts (id) on delete cascade,
+    scopes  text[] not null default array[]::text[],
+    expires timestamptz not null
+);
+
+create table config (
+    id int primary key not null default 1,
+    name text not null, -- instance name
+    admin_id text references blogs (id) on delete set null, -- admin contact
+    internal_application text references applications (id) on delete set null,
+    constraint singleton check (id = 1) -- only one config table entry
+);
+
 -- +migrate Down
+drop table config;
+drop table tokens;
+drop table applications;
 drop table accounts;
 drop table blogs;
 drop table posts;