Replace the single-column `<fk table='...' column='...'/>` marker with a
unified, composite-capable format `<fk table='...' columns='local:foreign,...'/>`
and emit full column lists for many-to-many markers, so clients can
reconstruct composite relationships.
- Match every real table relationship a column participates in, instead of
only single-column foreign keys, still preferring tables over the
view-derived relationships.
- Emit the full ordered local->foreign column mapping in the `<fk>` marker
and the full source/target column lists in the `<m2m>` marker.
- Add composite foreign key and composite m2m fixtures plus OpenAPI spec
assertions.
Compute per-row editability and deletability from a table's row-level
security policies and return them as synthetic columns so clients can
hide edit/delete affordances for rows the user cannot change.
- Introspect pg_policies and relrowsecurity at schema-cache load and
combine the UPDATE/DELETE USING qualifiers per table (permissive OR,
restrictive AND).
- Store the combined qualifiers on Table and inject can_edit/can_delete
as computed select fields when expanding `select *`, only for
RLS-enabled tables with a matching policy (COALESCE'd to a boolean).
- Keep the computed columns out of the OpenAPI spec so they are not
rendered as regular fields.
- Add a cfExpression field to CoercibleField to carry raw SQL
expressions through the planner to SqlFragment.
Add unique constraint and many-to-many relationship metadata to the
generated OpenAPI spec so clients can render them.
- Store unique constraints on Table as tableUniqueCols (mirroring
tablePKCols) instead of denormalizing them onto each Column.
- Compute unique constraints via a per-table tbl_unique_cols CTE in
tablesSqlQuery.
- Annotate unique columns and composite unique constraints in property
descriptions, and emit m2m markers in table descriptions.
jimmy