chore: refresh gramsrv public release

deploy/migrations/0025_peer_usernames.up.sql

@@ -0,0 +1,51 @@
+CREATE TABLE IF NOT EXISTS public.peer_usernames (
+    username_lower text NOT NULL,
+    peer_type text NOT NULL,
+    peer_id bigint NOT NULL,
+    updated_at timestamp with time zone DEFAULT now() NOT NULL,
+    CONSTRAINT peer_usernames_pkey PRIMARY KEY (username_lower),
+    CONSTRAINT peer_usernames_nonempty_check CHECK (username_lower <> ''),
+    CONSTRAINT peer_usernames_peer_id_check CHECK (peer_id <> 0),
+    CONSTRAINT peer_usernames_peer_type_check CHECK (peer_type IN ('user', 'channel'))
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS peer_usernames_peer_unique_idx
+    ON public.peer_usernames (peer_type, peer_id);
+
+INSERT INTO public.peer_usernames (username_lower, peer_type, peer_id)
+SELECT lower(username), 'user', id
+FROM public.users
+WHERE username <> '';
+
+INSERT INTO public.peer_usernames (username_lower, peer_type, peer_id)
+SELECT lower(username), 'channel', id
+FROM public.channels
+WHERE NOT deleted AND COALESCE(username, '') <> '';
+
+CREATE OR REPLACE FUNCTION public.delete_user_peer_username() RETURNS trigger
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+    DELETE FROM public.peer_usernames WHERE peer_type = 'user' AND peer_id = OLD.id;
+    RETURN OLD;
+END;
+$$;
+
+CREATE OR REPLACE FUNCTION public.delete_channel_peer_username() RETURNS trigger
+    LANGUAGE plpgsql
+    AS $$
+BEGIN
+    DELETE FROM public.peer_usernames WHERE peer_type = 'channel' AND peer_id = OLD.id;
+    RETURN OLD;
+END;
+$$;
+
+CREATE TRIGGER users_delete_peer_username
+    AFTER DELETE ON public.users
+    FOR EACH ROW EXECUTE FUNCTION public.delete_user_peer_username();
+
+CREATE TRIGGER channels_delete_peer_username
+    AFTER DELETE ON public.channels
+    FOR EACH ROW EXECUTE FUNCTION public.delete_channel_peer_username();
+
+DROP TABLE IF EXISTS public.channel_usernames;