Add backend schema.

backend/schema.sql

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+-- На канале @pgsql в телеграмме гуру postgresql сказали, что можно спокойно использовать text
+-- для текстовых данных, а всякие varchar и char по факту являются text плюс различные ограничения.
+-- === default db ===
+-- articles
+create table "articles" (
+  "uuid"      uuid primary key,
+  "author"    text,
+  "title"     text,
+  "body"      text,
+  "posted"    timestamp with time zone not null,
+  "modified"  timestamp with time zone not null,
+  "published" boolean,
+  "tags"      text,
+  "alias"     text
+);
+
+create index "published_idx" on "articles"("published");
+
+-- disposable emails
+create table "disposableemails" (
+  "domain" text primary key,
+  "state"  text,
+  "json"   text
+);
+
+-- feedbacks
+create table "feedbacks" (
+  "id"      serial primary key,
+  "email"   text,
+  "message" text,
+  "ip"      inet
+);
+
+-- auth tokens
+create table "auth_tokens" (
+  "id"      serial primary key,
+  "jid"     text,
+  "uuid"    uuid,
+  "expires" timestamp with time zone
+);
+
+create index "uuid_idx" on "auth_tokens"("uuid");
+
+-- users
+create table "users" (
+  "username" text primary key,
+  "server"   text,
+  "email"    text,
+  "ip"       inet
+);
+
+create index "email_idx" on "users"("email");
+create index "user_server_id" on "users"("username", "server");
+
+
+-- === mam db ===
+-- mam preferences
+create table "archive_prefs" (
+  "username"   text primary key,
+  "def"        text,
+  "always"     text,
+  "never"      text,
+  "created_at" timestamp with time zone
+);
+
+-- mam archive
+create table "archive" (
+  "id"        uuid primary key,
+  "timestamp" timestamp with time zone,
+  "username"  text,
+  "bare_peer" text,
+  "kind"      text,
+  "nick"      text,
+  "txt"       text,
+  "xml"       text
+);
+
+create index "user_peer" on "archive"("username", "bare_peer");