shoney.arickathil
f3215c2f43
- the agent rename database-developer → codd (and its guide) happened inside lang-18's `aab4878` on dev, which stays there; the `docs(agents)` pick brought codd.md in beside the old file — remove the old name and its guide - docs/stories/porch/09-idempotent-replay.md: added on dev by `79e6da4`, whose earlier pick onto master (`refactor(porch-store)`) landed without it — the board, porch 1 and porch 4 link to it - docs/stories/porch/10-memory-features-over-table.md: the refine stub language 18's docs commit created on dev; the board and porch 00-story link to it, the code it waits on is not on master - docs/examples/skill-catalog/README.md: the story link fix from `b3d8c40` that its earlier pick (`8311330`) dropped in conflict resolution — dev's version taken - `just linkcheck` on master: every remaining broken link is a wmux story or spec (track not picked) or a developer-local `.dev/reference` symlink Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
30 lines
2.1 KiB
Markdown
30 lines
2.1 KiB
Markdown
# skill-catalog — the query grammar corpus (iteration 9g)
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> Corpus #1 for the query-grammar method (story
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> [databasev2 8](../../stories/databasev2/08-query-grammar-corpus.md)):
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> take a real application backed by an embedded SQL database, translate its
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> every statement to the writeonce query surface, and add only the grammar it
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> forces. The application is `~/projects/skillhost` (a C++ MCP host whose
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> in-memory SQLite holds its skill catalog).
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**Result: skillhost forced no new grammar.** Its entire SQL footprint — one
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table, a single-row `INSERT`, and four `SELECT`s (whose only non-trivial
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features are `COUNT(*)` and a correlated `NOT EXISTS`) — is expressible on the
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surface iteration 9b already shipped. The five statements, translated:
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| skillhost SQL (`src/catalog/catalog.cpp`) | writeonce | mode |
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| --- | --- | --- |
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| `INSERT INTO skills (…) VALUES (?,…)` + `SQLITE_CONSTRAINT` dup check | `insert Skill { … }` + `try…catch` on the `@unique` trap | `seed` |
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| `SELECT … WHERE name = ?` | `from x in Skill where x.name == n take 1 select x` | `get <name>` |
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| `SELECT … ORDER BY name` | `from x in Skill order by x.name select x` | `list` |
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| `SELECT COUNT(*) FROM skills` | `count(from x in Skill select x)` | `count` |
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| `SELECT … WHERE NOT EXISTS (SELECT 1 FROM skills c WHERE c.parent = s.name) ORDER BY name` | `from x in Skill where len(x.children) == 0 order by x.name select x` | `roots` |
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The one translation choice: skillhost's correlated `NOT EXISTS` (skills that
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are nobody's parent) becomes a **backlink emptiness** — `Skill.children` is the
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inverse of `parent`, and `len(x.children) == 0` is the childless test. No
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subquery construct is needed; the general `exists`/`not exists` is deferred
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until a corpus uses a correlation a backlink cannot express.
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`skill-catalog seed | list | roots | count | get <name>`, WAL-durable under
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`WO_DATA`. A program with any durable table (the default) refuses to start without `WO_DATA`; `WO_EPHEMERAL=1` opts into a RAM-only run, `@table(durable: false)` opts a table out. Acceptance: `scripts/skill-catalog-accept.sh`.
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