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Serve v2 metadata in parts loaded on demand, cacheable per catalog version - #4042

Merged

anth-volk merged 33 commits into

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v2plan/1f-116-catalog-routes-on-demand

Nov 3, 2026

Merged

Serve v2 metadata in parts loaded on demand, cacheable per catalog version#4042
anth-volk merged 33 commits into
masterfrom
v2plan/1f-116-catalog-routes-on-demand

Commits on Nov 3, 2026
- Serve v2 metadata responses with an ETag and a cache lifetime
  
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- Serve the small parts of a catalog version at /v2/model-catalog
  
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- Serve every variable of a catalog version with its part parameters' values
  
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- Fetch several parameters by name with their values and breadcrumb labels
  
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- Filter parameter pages and values by exact parameter names
  
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- Keep whole catalog-version responses once built in each process
  
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- Check the on-demand catalog routes on each release and record their times
  
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- Reuse current parameter values only until the next UTC midnight
  
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- Read v2 metadata in autocommit sessions on the shared pool
  
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- Keep each selected catalog version for the life of the process
  
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- Keep each whole-version response's ETag, under the version it was read from
  
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- Read every v2 metadata query through the shared query models
  
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- Type the new metadata reads and remove their duplicated lookups
  
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- Let browser scripts read metadata responses' ETag
  
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- Record the slow existing routes' times on each release, even after a failure
  
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- Read current parameter values and set their lifetime from one instant
  
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- Vary every cacheable metadata response by Origin
  
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- Document metadata caching headers, 304 and the 400 case in OpenAPI
  
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- Keep a response's build lock until it is stored, and state the cache's size
  
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- Refuse writes through v2 read sessions and state who uses them
  
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- Describe the metadata stores in the layout guide and drop FoundParameters
  
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- Give parameter-tree leaves the economy and household flags
  
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- Give every request waiting on a whole-version read that read's outcome
  
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- Give cacheable 200 and 304 responses the same Vary, each value once
  
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- Declare 400 only on the metadata route with the country in its path
  
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- Test autocommit reads on one pooled connection and the production reader
  
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- Bring the 1.16 changelog fragment in line with the caching behavior
  
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- Import the connector modules in a test instead of suppressing line length
  
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- Serve each variable's unit and definition period
  
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- Require the catalog format 2 fields in the metadata response schemas
  
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- Look up test model versions through one helper taking the model name
  
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- Test that both variables routes serve unit and definition period
  
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- Say the same in the Stage 9 guide about who reads unit and definition period
  
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Commits

Commits on Nov 3, 2026