ADR-008: Blank weekly review persistence

Status: Accepted

Context

Open Question 2: does GET /reviews/{week_key} persist a blank review or return a transient one?

Decision

Preserve the Tkinter behavior: ReviewService.get_or_create returns a transient blank review (with the derived date range and id == 0) that is not written to the database until the user explicitly saves it. Verified by test_get_or_create_returns_transient_blank.

Consequences

• No empty review rows accumulate for merely-viewed weeks.
• The renderer shows "(not yet saved)" until the first save.