D-replace per #14: rip out PREREQ + RESHAPE_STEPS + applyDecoratorMigrations
and replace with declarative DecoratorSchema (entity columns + indexes +
sidecar tables). SchemaBuilder<Decorators...>::create composes the stack
into a single CREATE TABLE per entity table; SchemaContract::verify
introspects-and-asserts at runtime so code can never run against an
under-migrated DB. Atlas (atlasgo.io) becomes the authority for schema
evolution between deploys — decorator code never runs ALTER at runtime.
- TemporalRepository contributes valid_from/valid_until + UNIQUE composite index
- AuditLogRepository contributes the audit_log sidecar table
- ScopeGuardRepository declares empty contributions for clean stacking
- 8 new tests in test_schema_contract.cpp covering compose / dedup / verify
- README updated; bumped 0.8.0 → 0.9.0
fewo-webapp does not yet call applyDecoratorMigrations, so this is a
clean cut — no consumer-side breakage. PRs 1-4 (role_templates,
user_property_permissions, user_group_permissions, users) follow.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Each decorator now bundles its schema prereqs alongside its code via
DecoratorPrereq (additive CREATE-IF-NOT-EXISTS) and ReshapeStep
(non-idempotent reshape gated on a detectSql probe).
applyDecoratorMigrations<Decorators...>(table, probe, exec, recorder)
walks the listed decorators at startup, runs every PREREQ, runs every
reshape step whose probe returns false. Database-agnostic — consumer
wires probe/exec to their DbClient. SCHEMA_MIGRATIONS_TABLE_SQL is
provided for observability; the detect-probe is the source of truth.
TemporalRepository ships add_valid_from / add_valid_until /
drop_unique_entity_id / composite_unique (UNIQUE(entity_id, valid_until)
so close-then-insert can run in a deferred-FK transaction).
AuditLogRepository ships the audit_log CREATE TABLE.
ScopeGuardRepository ships nothing — exposes empty PREREQ + zero-length
RESHAPE_STEPS so it can be listed in applyDecoratorMigrations alongside
the schema-touching decorators without SFINAE.
Closes#12
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
