feat(database): server runtime — drizzle pool, OBO, transactions, hooks#355

Draft

ditadi wants to merge 12 commits intostack/database/foundationfrom

stack/database/server

Commits on May 7, 2026

refactor(database): switch entity runtime from Data API to Drizzle pool
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feat(database): map Prefer merge-duplicates + on_conflict to upsert routes
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feat(database): expose transaction(fn) and sql`...` on appkit.database
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fix(database): parse ?include=posts,author in routes; drop bogus ?select forwarding
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fix(database): scope asUser pool/transaction/sql to user; drain evicted pools
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feat(database): hide private columns from default reads and routes
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feat(database): set app.user_id on per-user pool connections for RLS
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feat(database): drizzle-runtime SQL snapshots; document signal as no-op
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feat(database): scrub route errors, cap toArray, tighten OBO pool fan-out
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feat(database): server polish — typed coerce, healthz, hashed log keys, txn cap, hook tests
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fix(database): restore readDefaults/writeDefaults and DatabasePoolTuning after foundation cleanup
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fix(database): default to non-private cols; combine include where; harden lookup; normalize OBO
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