src/storage/migrations.js

import { schemaMigrations, addColumns } from '@nozbe/watermelondb/Schema/migrations'
export const STORE_PREFIX = 'matrix_'

export default schemaMigrations({
  migrations: [
    {
      // ⚠️ Set this to a number one larger than the current schema version
      toVersion: 4,
      steps: [
        // See "Migrations API" for more details
        addColumns({
            table: `${STORE_PREFIX}user_settings`,
            columns: [
              { name: 'key', type: 'string', isOptional: true },
            ],
          }),
      ],
    },
  ],
})