1 files changed, 92 insertions, 0 deletions
diff --git a/migrations/20241017005219_retain_deleted.sql b/migrations/20241017005219_retain_deleted.sql
new file mode 100644
index 0000000..6205482
--- /dev/null
+++ b/migrations/20241017005219_retain_deleted.sql
@@ -0,0 +1,92 @@
+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
+		not null,
+	created_sequence bigint
+		unique
+		not null,
+	created_at text
+		not null,
+	unique (id, name)
+);
+
+insert into channel (id, name, created_sequence, created_at)
+select id, name, created_sequence, created_at from old_channel;
+
+create table channel_name_reservation (
+	id text
+		not null
+		unique,
+	name text
+		not null
+		unique,
+	primary key (id, name),
+	foreign key (id, name)
+		references channel (id, name)
+);
+
+insert into channel_name_reservation (id, name)
+select id, name 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
+		not 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);