Initial commit: Add project files

db/migrations/0011_signal_engine_hardening.sql

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+-- v11.1 hardening delta. Do not edit prior migrations.
+
+create index if not exists ix_outbox_pending
+    on building_blocks.outbox_message (occurred_at, message_id)
+    where published_at is null;
+
+create index if not exists ix_job_run_status_started
+    on building_blocks.job_run (status, started_at);
+
+alter table signal_engine.signal_decision
+    add constraint ck_signal_decision_policy_id_not_blank
+    check (length(trim(policy_id)) > 0) not valid;
+
+alter table signal_engine.signal_decision
+    validate constraint ck_signal_decision_policy_id_not_blank;
+
+drop trigger if exists signal_decision_immutable on signal_engine.signal_decision;
+create trigger signal_decision_immutable
+before update or delete on signal_engine.signal_decision
+for each row execute function signal_engine.prevent_immutable_change();
+
+create unique index if not exists ux_reentry_stage_executed_cycle
+    on signal_engine.reentry_stage (executed_cycle_id)
+    where executed_cycle_id is not null;