ditto/packages/db/migrations/009_add_stats.ts

import type { Kysely } from 'kysely';

export async function up(db: Kysely<unknown>): Promise<void> {
  await db.schema
    .createTable('author_stats')
    .addColumn('pubkey', 'text', (col) => col.primaryKey())
    .addColumn('followers_count', 'integer', (col) => col.notNull().defaultTo(0))
    .addColumn('following_count', 'integer', (col) => col.notNull().defaultTo(0))
    .addColumn('notes_count', 'integer', (col) => col.notNull().defaultTo(0))
    .execute();

  await db.schema
    .createTable('event_stats')
    .addColumn('event_id', 'text', (col) => col.primaryKey().references('events.id').onDelete('cascade'))
    .addColumn('replies_count', 'integer', (col) => col.notNull().defaultTo(0))
    .addColumn('reposts_count', 'integer', (col) => col.notNull().defaultTo(0))
    .addColumn('reactions_count', 'integer', (col) => col.notNull().defaultTo(0))
    .execute();
}

export async function down(db: Kysely<unknown>): Promise<void> {
  await db.schema.dropTable('author_stats').execute();
  await db.schema.dropTable('event_stats').execute();
}