Add valuesets_ddl.sql

valuesets_ddl.sql

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+-- Terminology lookup table -- ABLATION FRAGMENT, NOT PART OF THE FROZEN SCHEMA.
+--
+-- IMPORTANT: this block was NOT present in schema/schema.sql during the published
+-- training and evaluation runs. The `valuesets` table existed in both DuckDB
+-- databases and every gold query resolved terminology through it, but its DDL was
+-- never shown to the model -- fine-tuned models learned its columns implicitly from
+-- thousands of training targets, while the frozen baseline had only the table name
+-- to go on.
+--
+-- valuesets_ablation.ipynb prepends this fragment to schema.sql and re-runs the
+-- held-out evaluation on the published checkpoints, to measure how much of the
+-- frozen model's failure is attributable to the missing table description rather
+-- than to reasoning ability. See PAPER.md Section 5.6.
+--
+-- Do NOT merge this into schema.sql: doing so would break correspondence between
+-- the committed schema and the runs reported in the paper.
+
+CREATE TABLE valuesets (
+    table_name            VARCHAR,     -- which fact table this concept belongs to
+    code                  VARCHAR,
+    code_system           VARCHAR,     -- joins against that table's `system`-suffixed column
+    display               VARCHAR,     -- human-readable concept name; the ILIKE search target
+    lookup_ambiguous      BOOLEAN      -- display text matches >1 row in the same table under ILIKE containment
+);