Phase 2 P0 of the deadline + procedural-events revision. Establishes
paliad.projects.scenario_flags (jsonb) + paliad.scenario_flag_catalog as
the single source of truth for per-project scenario state — replacing
the three fragmented stores athena flagged (project_event_choices,
scenarios.spec, DOM-only). All three were empty per the audit so no
data migration is needed.
The jsonb map carries two key shapes:
* named flags (whitelist via scenario_flag_catalog) — today
with_ccr / with_amend / with_cci
* per-rule selection deviations of shape "rule:<uuid>" — wired up
here for validation; the consumer UI lands in P3
Endpoints:
GET /api/projects/{id}/scenario-flags
PATCH /api/projects/{id}/scenario-flags
PATCH semantics: bool = write; null = delete (priority-driven default
returns); missing key = leave alone. The service validates every key
on write (catalog lookup + UUID rule-membership + mandatory-cannot-be-
deselected) before persisting, so a single bad key fails the whole
patch.
Frontend bind: new scenario-flags.ts client module + Mode B's flag
checkboxes (ccr-flag / inf-amend-flag / rev-amend-flag / rev-cci-flag)
now hydrate from / persist to the project's scenario_flags on every
toggle. Kontextfrei (no project) is unchanged. Cross-surface coherence
via a scenario-flag-changed CustomEvent (peer surfaces — Verfahrens-
ablauf strip, Mode B result-view — will subscribe in P3).
Mig 154 is audit-defensive (set_config of paliad.audit_reason); no
audit trigger fires on paliad.projects today but a future one will
inherit the reason. Seeds the three known flags. CHECK constraints
enforce the top-level shape (jsonb_typeof = 'object') and the
catalog key pattern (lowercase, not 'rule:%' prefix).
Verified against the live DB: 18 projects default to '{}', catalog
has 3 rows, applied_migrations advanced to 154.
Design: docs/design-deadline-system-revision-2026-05-27.md §2.3, §2.4a,
§4.1, §5 (P0 row). t-paliad-331.