Deprecate the episode field in favor of code in the Episode model.

// Episode schema
{
  id: Number,
  name: String,
  code: String,  // deprecate episode
  air_date: String,
  characters: [String],
  url: String,
  created: Date,
}

Update list

• Episode schema, structure and static query.
• Episode filter query params
• Allowed filters
• TypeDefs deprecation directives in field and input definitions.
• Database $rename
• Docs
• Tests and mock data.