[clincoln8]

Summary

This PR adds an explicit node existence check for variableMeasured in SDMX Data and Availability queries.

Previously, when an SDMX query requested a non-existent or misspelled variableMeasured, prepareSdmxShape() received 0 observationProperties edges and silently defaulted the shape to [observationAbout]. Subsequent entity filters (like c[sex]=Female or c[country]=country/ARE) evaluated against [observationAbout] failed with a misleading error: unsupported SDMX component filter "sex"; filterable components are [observationAbout, ...] when it should just say that the variable didn't exist.

Changes

• Uses typeOf property check as an existence check for variableMeasured
• Updates observationPropertiesPageSize multiplier to account for typeOf edges

[gemini-code-assist]

Code Review

This pull request updates SDMX query preparation to fetch both observationProperties and typeOf predicates in a single database call, adds validation to ensure requested variables exist (returning a NotFound error if they do not), and refactors hardcoded predicate strings to use constants. The review feedback highlights that fetching both predicates increases the number of expected edges per variable. The current page size multiplier of 4 (maxObservationPropertyEntitySlots + 1) might cause silent truncation of edges during large batch queries, potentially missing properties or failing to detect unsupported metadata. It is recommended to update the observationPropertiesPageSize helper function to use a multiplier of 5 (maxObservationPropertyEntitySlots + 2) to safely accommodate the additional typeOf edge.

[clincoln8]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the SDMX shape preparation to fetch both observationProperties and typeOf predicates, and introduces a check to return a NotFound error if a requested variableMeasured does not exist. It also updates the page size calculation and corresponding unit tests to reflect these changes. I have no feedback to provide.