# 22 — Activity log

## Goal

Generic activity feed every module writes to and the dashboard reads from.

## Depends on

- 10, 11, 12

## Scope

- Schema: `activity_log` (`id`, `household_id`, `entity_type`, `entity_id`, `actor_id`, `action`, `payload` jsonb, `created_at`). Index on `(household_id, created_at desc)`.
- `_core` exports `logActivity({ entityType, entityId, action, payload })`. Reads `householdId` and `actorId` from current session.
- Calendar/lists/notes modules call it on create/update/delete.
- Dashboard widget `core.activity` shows last 20 entries with human-readable rendering. Each entity type's manifest provides a `renderActivity(entry)` function.

## Out of scope

- Per-user activity filters.
- Retention / pruning (no growth concerns at two-user scale).

## Acceptance criteria

- [ ] Every CRUD across the three core modules writes a row.
- [ ] Widget renders entries via the registry — no `if (entityType === ...)` branches in the widget itself.