Storage and database

• Migrations
  • 1. Migration 1: Schema change
  • 2. Migration 1: Post schema change
  • 3. Migration 2: Schema change
  • Construction of migration classes
  • Console commands
• Database access
  • Transactions
  • Mappers
  • Entities
  • Supporting more databases
• Configuration
  • System values
  • App values
  • User values
• Nextcloud filesystem API
  • Node API
• AppData
  • The simple filesystem