Law Tech Rants, the latest writing by Law Wen Feng
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Moving an Azure VM Between Virtual Networks The Delete-and-Recreate Constraint
Azure does not support in-place VNet moves for VMs; only disks survive a delete-and-recreate. Here is what the documentation explicitly guarantees, what it does not, and how to design topology so the move stays…
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Terraform Refresh-Only Mode Reconciling State With Out-of-Band Changes
Read: Terraform Refresh-Only Mode: Reconciling State With Out-of-Band ChangesWhen an incident forces a manual cloud edit, normal planning proposes to undo it. Refresh-only mode is the narrow tool that absorbs the change into state…
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PostgreSQL MVCC vs DDL When Migrations Silently Break Long-Running Snapshots
Read: PostgreSQL MVCC vs DDL: When Migrations Silently Break Long-Running SnapshotsPostgreSQL marks TRUNCATE and table-rewriting ALTER TABLE as not MVCC-safe. A long-running transaction that has not yet touched the table can see it empty after the…
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Reading Prompt Caching and Latency Together Across Microsoft Foundry Deployment Types
Read: Reading Prompt Caching and Latency Together Across Microsoft Foundry Deployment TypesEngineers on Microsoft Foundry who see TTLT fall but cached_tokens stay flat cannot tell cache work from throughput changes. Here is how to read the six…
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Speculative vs. Saved Terraform Plans Making CI Approval Match Execution
Read: Speculative vs. Saved Terraform Plans: Making CI Approval Match ExecutionA source-grounded Terraform CI pattern that separates plan exit codes, saved-plan approval and execution, while retaining backend-locking qualifications.
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Kubernetes Rollout Budgets Are Not a Capacity Plan
Read: Kubernetes Rollout Budgets Are Not a Capacity PlanSeparate rollout availability, temporary resource overlap, and probe behavior before treating Kubernetes surge settings as a capacity plan.
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Why a WordPress Timeout Must Not Trigger a Second Publication
Read: Why a WordPress Timeout Must Not Trigger a Second PublicationA network timeout on a WordPress create can return an inconclusive response. Retrying the create risks a duplicate publish. Here is how to keep it safe.
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Azure Cobalt 200 + Blackwell RTX AI VM Cost-Perf Playbook (2026)
Read: Azure Cobalt 200 + Blackwell RTX: AI VM Cost-Perf Playbook (2026)Azure Cobalt 200 vs Blackwell RTX Pro for AI VMs. Real-world cost-perf benchmarks, when to pick Arm vs GPU, and Malaysia deployment pricing context.
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