backend outbox integration

backend/db/migrations/000008_operation_uuid.down.sql

@@ -0,0 +1,4 @@
+ALTER TABLE operations DROP CONSTRAINT operations_operation_id_hex_check;
+
+ALTER TABLE operations
+    ALTER COLUMN operation_id TYPE BIGINT USING operation_id::bigint;

backend/db/migrations/000008_operation_uuid.up.sql

@@ -0,0 +1,12 @@
+-- operation_id outbox : BIGINT → TEXT 32-hex (UUID client-generated)
+-- cf. docs/api-v1.md §6.1 — idempotence UNIQUE(device_id, operation_id)
+-- survit car le nom de colonne ne change pas.
+-- Les traces héritées (ancien protocole, operation_id INTEGER) sont converties
+-- en 32-hex paddé (LPAD injectif → l'unicité (device_id, operation_id) tient,
+-- et le CHECK 32-hex est satisfait ; valeurs jamais rejouées, traces inertes).
+ALTER TABLE operations
+    ALTER COLUMN operation_id TYPE TEXT USING LPAD(operation_id::text, 32, '0');
+
+ALTER TABLE operations
+    ADD CONSTRAINT operations_operation_id_hex_check
+    CHECK (operation_id ~ '^[0-9a-f]{32}$');