feat: composable middleware chains, typed API client, repo pattern, Redis cache - #1063
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…edis cache Closes Smartdevs17#985 Closes Smartdevs17#981 Closes Smartdevs17#982 Closes Smartdevs17#983 - Composable security middleware chains with fluent builder API (authHandler, corsHandler, rateLimitHandler, sanitizationHandler, validationHandler, securityHeadersHandler, preset publicApiChain / authenticatedApiChain, toExpressMiddleware adapter, instrumented execution telemetry) - Typed SDK client with automatic retry (TypedSubTrackrClient: full typed signatures, exponential back-off + jitter, Retry-After header respect, idempotency keys on payment mutations, cursor pagination, per-request metrics) - PostgreSQL repository pattern (PgSubscriptionRepository, PgTransactionRepository, PgUserRepository, PgMerchantRepository, PgLoyaltyRepository — parameterised queries, PostgresUnitOfWork with BEGIN/COMMIT/ROLLBACK, factory helper) - Intelligent Redis cache with tag-based invalidation (tiered TTLs hot/warm/cold, stale-while-revalidate, single-flight, circuit breaker, wireEventInvalidation, SUBSCRIPTION_INVALIDATION_RULES) - Unit + integration tests for all four features (>80% coverage target)
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Closes #985
Closes #981
Closes #982
Closes #983
Composable security middleware chains with fluent builder API (authHandler, corsHandler, rateLimitHandler, sanitizationHandler, validationHandler, securityHeadersHandler, preset publicApiChain / authenticatedApiChain, toExpressMiddleware adapter, instrumented execution telemetry)
Typed SDK client with automatic retry (TypedSubTrackrClient: full typed signatures, exponential back-off + jitter, Retry-After header respect, idempotency keys on payment mutations, cursor pagination, per-request metrics)
PostgreSQL repository pattern (PgSubscriptionRepository, PgTransactionRepository, PgUserRepository, PgMerchantRepository, PgLoyaltyRepository — parameterised queries, PostgresUnitOfWork with BEGIN/COMMIT/ROLLBACK, factory helper)
Intelligent Redis cache with tag-based invalidation (tiered TTLs hot/warm/cold, stale-while-revalidate, single-flight, circuit breaker, wireEventInvalidation, SUBSCRIPTION_INVALIDATION_RULES)
Unit + integration tests for all four features (>80% coverage target)