[POSTGRESQL] az postgres flexible-server restore: Add --sku-name and --tier arguments to allow changing compute during point-in-time restore

[Gabriel Lobo (thegabrielobo)]

🤖 PR Validation — ⚠️ Review suggested

Breaking Changes	Tests
⚠️ None	️✔️ 130/130

⚠️AzureCLI-BreakingChangeTest

⚠️postgresql

rule	cmd_name	rule_message	suggest_message
⚠️ 1006 - ParaAdd	postgres flexible-server restore	cmd postgres flexible-server restore added parameter sku_name
⚠️ 1006 - ParaAdd	postgres flexible-server restore	cmd postgres flexible-server restore added parameter tier

Related command
az postgres flexible-server restore

Description
Point-in-time restore previously always inherited the source server's compute SKU, so there was no way to resize a server during a restore. This adds --sku-name and --tier to az postgres flexible-server restore, matching capability already available on az mysql flexible-server restore.

Behavior:

Arguments supplied	Result
Neither	Unchanged — the restored server inherits the source server's SKU
--sku-name only	Tier is inherited from the source server; the SKU is validated against that tier
--tier only	The default SKU for that tier is used, and a warning is emitted
Both	Both are validated against the location capability API

Downgrading below the source server's compute tier is rejected, so a GeneralPurpose or MemoryOptimized server cannot be restored down to Burstable.

Two changes beyond the plain argument addition are worth reviewer attention:

1. pg_restore_validator now receives the resolved target tier rather than the source server's tier. Previously a Burstable source could never be restored with --storage-type PremiumV2_LRS; restoring Burstable → GeneralPurpose with SSDv2 now works, which is the point of allowing a tier change.
2. Argument validation errors are re-raised as-is instead of being masked by the surrounding except Exception: raise ResourceNotFoundError(e). Without this, an invalid --tier surfaced as a confusing "not found" error rather than the actual validation message.

Tier ordering uses an explicit rank map rather than inferring order from the capability API's dictionary key order, which is not guaranteed stable.

Testing Guide

Restore with a different compute size, inheriting the source server's tier:

az postgres flexible-server restore --resource-group testgroup --name testservernew \
  --source-server testserver --sku-name Standard_D4s_v3

Restore with a different compute tier and size:

az postgres flexible-server restore --resource-group testgroup --name testservernew \
  --source-server testserver --tier MemoryOptimized --sku-name Standard_E2ds_v4

Restore with no compute arguments, which must behave exactly as before:

az postgres flexible-server restore --resource-group testgroup --name testservernew \
  --source-server testserver

Downgrading the tier must be rejected:

az postgres flexible-server restore --resource-group testgroup --name testservernew \
  --source-server <memory-optimized-server> --tier GeneralPurpose

Automated checks run locally:

• azdev style postgresql — Pylint PASSED, Flake8 PASSED
• azdev linter postgresql — no violations
• New offline unit tests in test_postgres_flexible_restore_sku_params.py (7 tests, no network) covering argument registration and pg_restore_tier_validator upgrade / same-tier / downgrade / Burstable / unknown-tier cases
• The existing recorded restore scenario test still passes and is unmodified

The recorded scenario test was intentionally left untouched: adding new commands to it invalidates the committed cassette (RecordMode.ONCE) and requires a live re-record, which is tracked as follow-up so the new arguments get end-to-end coverage.

History Notes

[POSTGRESQL] az postgres flexible-server restore: Add --sku-name and --tier arguments to allow changing compute during point-in-time restore

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Thank you for your contribution Gabriel Lobo (@thegabrielobo)! We will review the pull request and get back to you soon.

[Aditya Pujara (a0x1ab)]

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[Yong Zhang (yonzhan)]

postgres

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[nasc17]

Instead add new args to restore test already in project and re-record results