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The concurrent-append and drop-all DynamoDB tests shared a database prefix. A timeout in the first could leave its table visible to the second. Give each test its own prefix while retaining five independent concurrent appends, the six-row assertion, and all drop/recreate checks. The final two-prefix diff passed both tests in hosted LocalStack across Node 22, 24, 26, and Node 24 experimental, without timing instrumentation ([run 43245851764](https://github.com/lancedb/lancedb/actions/runs/43245851764), head `5896c419`). Concurrency and the 5000 ms budget are unchanged. This fixes cascading fixture contamination; the original timeout remains unexplained, and these passing runs do not prove its root cause was fixed.