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You save to the database and publish an event to a queue. These are two writes, and one can fail. The outbox pattern makes them one. Here is how.

When two systems edit the same record, last-write-wins is the easy answer. It also throws away data on purpose. Here is when that is fine, and when it is a trap.

When you really delete a row, other systems can never learn that it is gone. A tombstone is a delete you can see. Here is why it matters and how to use one.

Offset pagination is easy to write and breaks in two ways: it gets slow, and it skips or repeats rows when the data changes. Cursor pagination fixes both. Here is the difference.

Everybody wants exactly-once delivery. Over a network it is impossible. Here is why, and the trick that gives you the same result in practice.