-- Operator-maintained username blocklist. A name listed here cannot be taken as
-- an editable username by any peer (account.updateUsername, channels.updateUsername,
-- @BotFather /setusername, or the admin set-username actions). It is a plain
-- blocklist: no owner, no price, no Fragment collectible badge.

CREATE TABLE public.reserved_usernames (
    username_lower text PRIMARY KEY CHECK (
        username_lower <> '' AND username_lower = lower(username_lower)
    ),
    username   text NOT NULL,
    reason     text NOT NULL DEFAULT '' CHECK (octet_length(reason) <= 512),
    actor      text NOT NULL DEFAULT '' CHECK (octet_length(actor) <= 256),
    created_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX reserved_usernames_created_at_idx
    ON public.reserved_usernames (created_at DESC, username_lower);