reading: split the book tracker into books, papers and articles (kind column + migration classifying 20 papers), segmented tabs with counts, article cards that open the link, owner + add link with server-side unfurl, kind switch on detail pages, /trackers/reading alias

src/lib/server/db/schema/books.ts

@@ -34,10 +34,15 @@ export const bookReadingStatus = booksSchema.enum('reading_status', [
 	'abandoned'
 ]);
 
+// What a work is: a book, a scientific paper, or a web article / link on the reading list.
+// Articles have no files; they live at `url` and are opened externally.
+export const bookKind = booksSchema.enum('kind', ['book', 'paper', 'article']);
+
 export const bookWorks = booksSchema.table(
 	'works',
 	{
 		id: id(),
+		kind: bookKind('kind').notNull().default('book'),
 		title: text('title').notNull(),
 		subtitle: text('subtitle'),
 		authors: text('authors').array().notNull().default([]),
@@ -61,9 +66,18 @@ export const bookWorks = booksSchema.table(
 		metadataSource: text('metadata_source'), // 'openlibrary' | 'googlebooks' | 'libgen' | 'manual'
 		metadataFetchedAt: timestamptz('metadata_fetched_at'),
 		notes: text('notes'),
+		// Articles and papers on the web: canonical link, site name and publish date. The excerpt
+		// goes in `description` and the og:image in `cover_url`.
+		url: text('url'),
+		siteName: text('site_name'),
+		publishedAt: timestamptz('published_at'),
 		...timestamps
 	},
 	(t) => [
+		uniqueIndex('works_url_key')
+			.on(t.url)
+			.where(sql`${t.url} is not null`),
+		index('works_kind_idx').on(t.kind),
 		uniqueIndex('works_isbn13_key')
 			.on(t.isbn13)
 			.where(sql`${t.isbn13} is not null`),
@@ -206,4 +220,5 @@ export type BookShelf = typeof bookShelves.$inferSelect;
 export type BookProgress = typeof bookProgress.$inferSelect;
 export type BookNote = typeof bookNotes.$inferSelect;
 export type BookSession = typeof bookSessions.$inferSelect;
+export type BookKind = (typeof bookKind.enumValues)[number];
 export type BookReadingStatus = (typeof bookReadingStatus.enumValues)[number];