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feat: add immutable level template lifecycle

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2026-08-14 14:17:54 +02:00
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docs/exhibit-data-model.md
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@@ -317,14 +317,6 @@ The following are computed and must not become duplicate source-of-truth tables:
`save_level_as_template(level_id)` runs the same clone operation into a new immutable template-version board.
## Migration direction
## Implemented cutover
The current `widgets`, `widget_relations`, and `playthrough_*` tables are transitional. The cutover should:
1. Introduce boards, exhibit tables, subtype tables, templates, and typed metadata.
2. Convert existing authored widgets to exhibits.
3. Materialize each existing playthrough as its own cloned mutable level.
4. Move document layout from relation JSON into document exhibit coordinates.
5. Convert `contains` relations to folder memberships and generic connections to exhibit connections.
6. Update the API to read and write exhibits directly.
7. Remove the transitional widget/playthrough tables only after data equivalence checks pass.
Migration 006 made this the sole persistence model. Because the POC database contained no canonical or legacy content worth preserving, the cutover intentionally dropped the JSON case store, `widgets`, `widget_relations`, and `playthrough_*` tables without a backfill period. Template save, version selection, instantiation, and reset now use one transactional board-cloning service. The remaining architectural work is the frontend exhibit/widget registry and the planned exhibit families.