[04] DuckDB read layer + Parquet publish for /v3 - #22

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chondl wants to merge 7 commits into

cph-state-snapshotfrom

Commits on Jul 10, 2026

Add Parquet/DuckDB table schema introspection
chondl
committed
d9105a1
Publish current-year tables to Parquet each cycle
chondl
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2311173
Add DuckDB read layer over Parquet blobs
chondl
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216e1d7
Serve /v3 from DuckDB behind API_BACKEND flag
chondl
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9087a3f
Make the Parquet table set a manifest-referenced atomic set
chondl
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6ddbd5d
Fold parquet into the single site manifest write; never clobber on read failure
chondl
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127c1de
Degrade team endpoints gracefully when no parquet exists yet
chondl
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19bcf4e