create table blob (
	blob_id integer primary key autoincrement,
	data blob not null,
	content_type text not null,

	created_timestamp text not null
) strict;

create table shelf (
	shelf_id integer primary key autoincrement,
	shelf_xid text not null unique,

	name text not null,

	created_timestamp text not null
) strict;

create table item (
	item_id integer primary key autoincrement,
	item_xid text not null unique,

	item_type text not null,
	name text not null,
	image_blob_id integer,

	started_timestamp text,
	finished_timestamp text,

	rating real,
	review text not null,

	other_metadata_json text,

	foreign key (image_blob_id) references blob(blob_id)
) strict;

create table shelf_item (
	shelf_item_id integer primary key,

	item_id integer not null,
	collection_id integer not null,

	foreign key (item_id) references item(item_id),
	foreign key (collection_id) references collection(collection_id),
	unique (item_id, collection_id)
) strict;

create table shelf_arrangement (
	shelf_arrangement_id integer primary key,
	shelf_arrangement_xid text not null unique,

	name text not null,

	collection_id integer not null,
	shelf_arrangement_json_blob text not null,

	foreign key (collection_id) references collection(collection_id)
) strict;

create table activity (
	activity_id integer primary key,

	activity_json_blob text not null
) strict;