engineering
The webhook is one of the worst customer-facing primitives in modern SaaS APIs. The customer has to operate a publicly-reachable HTTP endpoint, verify cryptographic signatures, handle retries and idempotency, decode payloads whose schema may change, and somehow tell whether a missing webhook is a sender problem or a receiver problem.
engineering
Most Postgres failure modes are gradual. Bloat accumulates and queries get slower; a forgotten replication slot fills the disk over weeks; a missing index turns a five-millisecond query into a five-second one. Transaction ID wraparound is the rare exception. The database runs at full speed up to the moment it
engineering
A tablespace is a named directory where Postgres can store table and index data, separate from the default data directory. The feature looks like an obvious optimization, but in practice the operational cost catches most teams that reach for it by reflex.
engineering
A request ID is a unique identifier the API attaches to every request. Customers paste it into support tickets, engineers grep for it in logs, and distributed tracing systems use it as the correlation key. Used well, it converts a fuzzy customer complaint into a precise debuggable record.
engineering
A replication slot tells the primary to keep WAL files until a downstream consumer has read them. If the consumer goes away and nobody notices, the WAL pile grows until the disk fills. It happens to teams that should know better.
engineering
The Retry-After header is one of the underused communication channels between API and client. Used well, it converts a 429 or 503 from an interruption into a coordinated handoff. Used poorly or omitted, it produces retry storms that make the situation worse.
engineering
The shared_buffers configuration parameter is one of the most-discussed and least-examined Postgres knobs. The 25-percent-of-RAM rule of thumb is correct often enough that most teams leave it there forever, but the rule answers the wrong question. The question is not how much memory to allocate; it is whether the
engineering
Single-request idempotency is a solved problem: the client sends a unique key, the server records the response keyed by that key, and retries return the cached response without re-executing the side effect. Bulk operations break this model in a non-obvious way. A batch of 1000 items is not a single
science
A sea urchin has hundreds of independently controllable hydraulic actuators that double as locomotion, feeding, respiration, and sensory organs. The water-vascular system is one of the few completely novel body plans in animal evolution, and it works on principles that human engineering has not d...
engineering
When the database feels slow but no individual query is slow, the answer is usually visible in pg_stat_activity. Reading connection states and wait events is the diagnostic skill that separates intermediate from senior Postgres operators.
engineering
Changelogs are read by maybe ten percent of customers. The other ninety percent discover changes when something breaks. The patterns that close this gap are not technical; they are about which changes warrant which notification channel.
engineering
Most teams optimize the queries they think are slow. The pg_stat_statements extension shows the queries that are actually consuming database time, which is often a different set entirely.