make quote nicks case insensitive

files/schema.sql

@@ -1,6 +1,6 @@
 create table if not exists quotes (
     id          serial       primary key,
-    nick        varchar(30)  not null,
+    nick        citext       not null,
     item        text         not null,
     channel     varchar(32)  not null,
     created_by  varchar(30)  not null,
@@ -72,3 +72,17 @@ create table if not exists last_messages (
     item     text          not null,
     unique (nick, channel)
 );
+
+create or replace function quotes_ci_nick_insert_fnc()
+returns trigger as $$
+begin
+    NEW.nick = coalesce((select nick from quotes where nick = NEW.nick limit 1), NEW.nick);
+    return NEW;
+end $$ language 'plpgsql';
+
+drop trigger if exists quotes_ci_nick_trigger on quotes;
+
+create trigger quotes_ci_nick_trigger
+before insert on quotes
+for each row
+execute procedure quotes_ci_nick_insert_fnc();