Migration 061 (paliad.user_card_layouts): per-user named card layouts.
- Partial unique index on (user_id) WHERE is_default=true keeps "at most
one default per user" honest at the DB level.
- UNIQUE (user_id, name) so the layout dropdown can use names as stable
labels.
- RLS owner-only (mirrors paliad.user_views from t-144).
LayoutSpec (internal/services/layout_spec.go): structured JSON validator
with KnownFactKeys registry (11 fact keys: title-row, type-chip, status-
chip, client-matter, parent-path, deadline-counts, next-events, recent-
verlauf, team-chips, reference, last-activity-at). Validator enforces:
- title-row must be the first VISIBLE fact (always-on, structural)
- no duplicate keys
- count ∈ [1, 5] only on next-events / recent-verlauf
- density ∈ {compact, roomy} (CardDensity, distinct from t-144's
ListDensity which only ranges over comfortable/compact)
- grid_columns ∈ {auto, 2, 3, 4}
DefaultLayoutSpec returns the m-locked rich content set per design §5b.4
(9 facts, roomy density, auto grid, leaf-ish projects only).
CardLayoutService: CRUD with auto-seed (GetDefault creates "Standard"
on first call) + tx-flip-default (setting is_default=true on B clears
A in the same transaction) + ErrUserCardLayoutDefaultGate (deleting
the active default returns 409). isPgUniqueViolation maps the partial
unique index conflict to ErrUserCardLayoutNameTaken.
ProjectService.CardsPreview: per-project event rollups for the Cards view.
4 source SQLs with ROW_NUMBER() OVER PARTITION BY project_id (top 3 each
for upcoming deadlines, upcoming appointments, recent project_events) +
team-chips JOIN. Single round-trip per source, visibility-gated. Returns
map[uuid.UUID]*ProjectCardPreview with last_activity_at computed across
all sources for the orchestrator's card-grid sort.
Handlers: 5 /api/user-card-layouts/* endpoints (GET list, POST create,
PATCH update, DELETE, POST set-default) + GET /api/projects/cards-preview
(narrowable via ?ids=<csv>).
Wired in handlers.go (Services struct + dbServices struct) and
cmd/server/main.go. ErrUserCardLayoutNameTaken / NotFound / DefaultGate
mapped to 409 / 404 / 409 respectively.
Tests:
- layout_spec_test.go (8 cases, pure-Go): valid default, empty rejection,
title-row-first invariant, hidden leading allowed, dup-key rejection,
unknown-key rejection, count-bounds + count-on-wrong-key, density/grid
enum, ParseLayoutSpec round-trip.
- card_layout_service_test.go (6 cases, live-DB): GetDefault auto-seeds
+ idempotent, first Create auto-becomes default, SetDefault clears
prior, Delete refuses active default, Delete non-default works,
duplicate name rejected, Update round-trips layout JSON.
go build / vet / test (short) clean.
Design: docs/design-projects-page-2026-05-07.md §5b.3, §5b.5, §8.2.
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