Postgres db integration.

src/db-init.sql

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+create table users(
+       user_id bigserial primary key,
+       auth_user_id int unique not null,
+       email varchar(255) not null,
+       username varchar(255) not null unique,
+       key_key varchar(255),
+       key_iv varchar(255));
+create unique index users_auth_user_id_idx on users (auth_user_id);
+
+create table user_service_configs(
+       id bigserial primary key,
+       user_id integer unique not null references users on delete cascade,
+       cloudflare_api_token_enc varchar(255),
+       cloudflare_account_id_enc varchar(255),
+       cloudflare_zone_id_enc varchar(255),
+       digitalocean_api_token_enc varchar(255),
+       digitalocean_region varchar(255),
+       digitalocean_size varchar(255),
+       backblaze_application_key_enc varchar(255),
+       backblaze_key_id_enc varchar(255),
+       backblaze_bucket_url_enc varchar(255)
+       );
+create unique index user_service_configs_user_id_idx on user_service_configs (user_id);
+
+create table user_selected_apps(
+       id bigserial primary key,
+       user_id integer unique not null references users on delete cascade,
+       wg_easy_version varchar(100),
+       nextcloud_version varchar(100),
+       log_viewer_version varchar(100)
+       );
+create unique index user_selected_apps_user_id_idx on user_selected_apps (user_id);
+
+create table user_app_configs(
+       id bigserial primary key,
+       user_id integer unique not null references users on delete cascade,
+       root_domain varchar(100),
+       config_enc text
+       );
+
+create unique index user_app_configs_user_id_idx on user_app_configs (user_id);