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alter table channel
rename to old_channel;
alter table message
rename to old_message;
create table channel (
id text
not null
primary key,
name text
null
unique,
created_sequence bigint
unique
not null,
created_at text
not null
);
insert into channel (id, name, created_sequence, created_at)
select id, name, created_sequence, created_at from old_channel;
create table channel_deleted (
id text
not null
primary key
references channel (id),
deleted_sequence bigint
unique
not null,
deleted_at text
not null
);
create table message (
id text
not null
primary key,
channel text
not null
references channel (id),
sender text
not null
references login (id),
sent_sequence bigint
unique
not null,
sent_at text
not null,
body text
null
);
insert into message (id, channel, sender, sent_sequence, sent_at, body)
select id, channel, sender, sent_sequence, sent_at, body from old_message;
create table message_deleted (
id text
not null
primary key
references message (id),
deleted_sequence bigint
unique
not null,
deleted_at text
not null
);
drop table old_message;
drop table old_channel;
create index message_sent_at
on message (sent_at);
create index channel_created_at
on channel (created_at);
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