API Platform's default sub-resource POST was replacing instead of adding.
Custom processor with read:false + Link + manual persist fixes this.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Use toProperty + identifiers instead of fromProperty to resolve
application slug correctly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>