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From the first idea to a working product.
The October 26–27 incident affected part of the Cloudflare Workers schedules: jobs could be delayed, skipped, or launched again. We examine how to perform a safe reconciliation without a mass restart.
A practical analysis of a webhook receiver: a stable event_id, a UNIQUE constraint, a transaction, a retry after a failure, and two simultaneous deliveries. The tutorial example was implemented and verified on Python 3.12 and SQLite 3.53.
The total discount on an order and the sum of discounts on its line items may diverge after rounding. We examine a precise educational calculation, a stable method for distributing the remainder, and how to preserve amounts for returns.
A practical template for a technical specification for data exchange between an online store and 1C: data sources, identifiers, conflict resolution rules, error handling, and acceptance criteria.
We explain how to turn a website from a simple business card into a tool for attracting customers and driving sales
We analyze why brands are increasingly seeking to reduce their dependence on marketplaces and develop their own websites as independent sales channels
Deleting a record between pages shifts the result set. We examine offset, cursor, consistent snapshot, and export resumption after a failure using a small example.
Two JSON payloads with identical data can have different HMAC signatures. We show a verified example with spaces and the boundaries for authenticating incoming notifications.
A single moment can have different calendar dates in Moscow and UTC. Using a verified example, we examine day boundaries, fractional seconds, and the distinction between delivery date and event time.
A single demonstration does not define readiness boundaries. We examine a pickup example, how to record reproducible issues, and how to re-verify fixes.
Retries in modules, libraries, and middleware handlers can multiply. We calculate a sample scenario and analyze the total operation duration, delays, and conditions for resending.
An external service expanded its list of states, but the store is unaware of the new code. We examine preserving the original event, halting dependent actions, and validating the new mapping rule.
A product file does not guarantee the preservation of relationships, images, or field meaning. We examine a small test set and the costs that should be clarified before connecting.
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