SELECT id, tenant, sku, available, unit_price, version FROM stock WHERE tenant = #{tenant} AND sku = #{sku} UPDATE stock SET available = available - #{quantity}, version = version + 1 WHERE tenant = #{tenant} AND sku = #{sku} AND available >= #{quantity} INSERT INTO orders (tenant, sku, quantity, amount, status, idempotency_key) VALUES (#{tenant}, #{sku}, #{quantity}, #{amount}, 'CREATED', #{idempotencyKey}) INSERT INTO order_idempotency (idempotency_key, tenant, request_hash) VALUES (#{idempotencyKey}, #{tenant}, #{requestHash}) UPDATE order_idempotency SET order_id = #{orderId} WHERE idempotency_key = #{idempotencyKey} AND tenant = #{tenant} SELECT idempotency_key, tenant, request_hash, order_id FROM order_idempotency WHERE idempotency_key = #{idempotencyKey} AND tenant = #{tenant} SELECT id, tenant, sku, quantity, amount, status, idempotency_key FROM orders WHERE id = #{id} AND tenant = #{tenant} SELECT id, tenant, sku, quantity, amount, status, idempotency_key FROM orders WHERE idempotency_key = #{idempotencyKey} AND tenant = #{tenant} INSERT INTO outbox (event_id, aggregate_id, aggregate_version, payload, state, available_at, claim_version) VALUES (#{eventId}, #{aggregateId}, #{aggregateVersion}, #{payload}, 'PENDING', NOW(6), 0) SELECT COUNT(*) FROM orders WHERE tenant = #{tenant}