Concepts

Term	Meaning
Workspace / Organization	Billing and channel container for your team
Channel	A connected social account (Facebook Page, Instagram, etc.)
Post	Content + targets + schedule status
Post target	Per-channel publish row (status, external id, settings)
Media asset	File stored in R2, referenced by posts
API key	Org credential for Public API (qp_live_)
OAuth app	Third-party client (pca_ / pcs_)
Access token	User-granted token for an OAuth app (pos_)

In the Public API we keep the product word channel (Postiz docs often say integration for the same idea).