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alter table channel
rename to old_channel;
-- Add new columns
create table channel (
id text
not null
primary key,
name text
not null
unique,
created_at text
not null
);
-- Transfer data from original table
insert into channel
select
channel.id,
channel.name,
coalesce(
min(message.sent_at),
strftime('%FT%R:%f+00:00', 'now', 'utc')
) as created_at
from old_channel as channel
left join message on channel.id = message.channel
group by channel.id, channel.name;
-- Fix up `message` foreign keys
alter table message
rename to old_message;
create table message (
id text
not null
primary key,
sequence bigint
not null,
channel text
not null
references channel (id),
sender text
not null
references login (id),
body text
not null,
sent_at text
not null,
unique (channel, sequence)
);
insert into message
select * from old_message;
-- Bury the bodies respectfully
drop table old_message;
drop table old_channel;
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