db/events: rework tags, make event_id a FK to events again, drop value_2 and value_3

src/db/migrations/005_rework_tags.ts

@@ -0,0 +1,68 @@
+import { Kysely, sql } from '@/deps.ts';
+
+export async function up(db: Kysely<any>): Promise<void> {
+  await db.schema
+    .createTable('tags_new')
+    .addColumn('tag', 'text', (col) => col.notNull())
+    .addColumn('value', 'text', (col) => col.notNull())
+    .addColumn('event_id', 'text', (col) => col.references('events.id').onDelete('cascade'))
+    .execute();
+
+  await sql`
+    INSERT INTO tags_new (tag, value, event_id)
+    SELECT tag, value_1 as value, event_id
+    FROM tags
+    WHERE value_1 IS NOT NULL
+  `.execute(db);
+
+  await db.schema
+    .dropTable('tags')
+    .execute();
+
+  await db.schema
+    .alterTable('tags_new')
+    .renameTo('tags').execute();
+
+  await db.schema
+    .createIndex('idx_tags_tag')
+    .on('tags')
+    .column('tag')
+    .execute();
+
+  await db.schema
+    .createIndex('idx_tags_value')
+    .on('tags')
+    .column('value')
+    .execute();
+
+  await db.schema
+    .createIndex('idx_tags_event_id')
+    .on('tags')
+    .column('event_id')
+    .execute();
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  await db.schema.dropTable('tags').execute();
+
+  await db.schema
+    .createTable('tags')
+    .addColumn('tag', 'text', (col) => col.notNull())
+    .addColumn('value_1', 'text')
+    .addColumn('value_2', 'text')
+    .addColumn('value_3', 'text')
+    .addColumn('event_id', 'text', (col) => col.notNull())
+    .execute();
+
+  await db.schema
+    .createIndex('idx_tags_tag')
+    .on('tags')
+    .column('tag')
+    .execute();
+
+  await db.schema
+    .createIndex('idx_tags_value_1')
+    .on('tags')
+    .column('value_1')
+    .execute();
+}