ENG-1909 Add no-op Next.js content upsert endpoint

[maparent]

https://linear.app/discourse-graphs/issue/ENG-1909/add-no-op-nextjs-content-upsert-endpoint

Content upsert, based on cross-app types.

This introduces a StandaloneContent type for upserting contents outside of concepts, following existing sync functions.

https://www.loom.com/share/cbffbfccbb384220bfe0a8aa80981b9d

[linear-code]

ENG-1909

[vercel]

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Project	Deployment	Actions	Updated (UTC)
discourse-graph	Ready	Preview, Comment	Jul 13, 2026 2:15pm

[supabase]

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[devin-ai-integration]

Devin Review found 2 potential issues.

View 2 additional findings in Devin Review.

[graphite-app]

Runtime error when ref is undefined. The function decodeRefWithInlineNulls accepts an optional ref?: Ref parameter (line 68), but unconditionally calls decodeRef(ref, ...) on line 79. This will crash when ref is undefined, which occurs in the actual usage on lines 144-148 and 149-153 where no ref parameter is passed.

Fix by adding a conditional check:

return {
  [dbVarName]: null,
  [localVarName]: null,
  [inlineVarName]: null,
  ...(ref ? decodeRef(ref, dbVarName, localVarName) : {}),
} as Record<DbVarName, number | null> &
  Record<LocalVarName, string | null> &
  Record<InlineVarName, null>;

Suggested change

	...decodeRef(ref, dbVarName, localVarName),
	...(ref ? decodeRef(ref, dbVarName, localVarName) : {}),

Spotted by Graphite



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