シナリオ
A journaling application needs a relational schema to track users, their journals and entries, tags, and file attachments.
この図に含まれるもの
図の背後にある意思決定を読み解く。
01
Composite primary key in EntryTag models many-to-many between entries and tags.
02
Attachments reference entries directly for one-to-many attachments.
03
User ownership cascades through journals to entries instead of direct user-entry link.
When to reuse: any personal journaling, note-taking, or content-collection app needing tags and attachments.