TL;DR: Trade Republic's "app login" path (ECDSA device pairing) stopped working in late 2025 when TR rolled out AWS-WAF in front of the auth endpoints. That broke this TypeScript connector. We rebuilt ...

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This article systematizes the maintenance and operation of Web systems by dividing them into five areas: SRE, DBRE, system performance, cloud operations, and observability and release strategy. For ...