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fix(pg-meta): pair composite FK columns positionally to avoid cartesi… #317

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Merged
gregnr merged 4 commits into from
Jul 17, 2026
Merged

fix(pg-meta): pair composite FK columns positionally to avoid cartesi… #317

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84039fb
fix(pg-meta): pair composite FK columns positionally to avoid cartesi…
anp8729 Jul 1, 2026
d17cdfb
Group composite FKs into single constraints with positionally ordered…
anp8729 Jul 16, 2026
c9fd142
test: add composite FK scenarios (self-referential, cross-schema, non…
anp0429 Jul 17, 2026
d34abe8
style: apply biome formatting to added FK tests
anp0429 Jul 17, 2026
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28 changes: 15 additions & 13 deletions packages/mcp-server-supabase/src/pg-meta/tables.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -56,24 +56,26 @@ FROM
c.conname as constraint_name,
nsa.nspname as source_schema,
csa.relname as source_table_name,
sa.attname as source_column_name,
array_agg(sa.attname order by cols.ord) as source_columns,
nta.nspname as target_table_schema,
cta.relname as target_table_name,
ta.attname as target_column_name
array_agg(ta.attname order by cols.ord) as target_columns
from
pg_constraint c
join (
pg_attribute sa
join pg_class csa on sa.attrelid = csa.oid
join pg_namespace nsa on csa.relnamespace = nsa.oid
) on sa.attrelid = c.conrelid and sa.attnum = any (c.conkey)
join (
pg_attribute ta
join pg_class cta on ta.attrelid = cta.oid
join pg_namespace nta on cta.relnamespace = nta.oid
) on ta.attrelid = c.confrelid and ta.attnum = any (c.confkey)
join lateral unnest(c.conkey, c.confkey)
with ordinality as cols(conkey, confkey, ord) on true
join pg_class csa on csa.oid = c.conrelid
join pg_namespace nsa on nsa.oid = csa.relnamespace
join pg_attribute sa
on sa.attrelid = c.conrelid and sa.attnum = cols.conkey
join pg_class cta on cta.oid = c.confrelid
join pg_namespace nta on nta.oid = cta.relnamespace
join pg_attribute ta
on ta.attrelid = c.confrelid and ta.attnum = cols.confkey
where
c.contype = 'f'
group by
c.oid, c.conname, nsa.nspname, csa.relname, nta.nspname, cta.relname
) as relationships
on (relationships.source_schema = nc.nspname and relationships.source_table_name = c.relname)
or (relationships.target_table_schema = nc.nspname and relationships.target_table_name = c.relname)
Expand All @@ -95,4 +97,4 @@ group by
c.relforcerowsecurity,
c.relreplident,
nc.nspname,
pk.primary_keys
pk.primary_keys
4 changes: 2 additions & 2 deletions packages/mcp-server-supabase/src/pg-meta/types.ts
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Expand Up @@ -12,10 +12,10 @@ export const postgresRelationshipSchema = z.object({
constraint_name: z.string(),
source_schema: z.string(),
source_table_name: z.string(),
source_column_name: z.string(),
source_columns: z.array(z.string()),
target_table_schema: z.string(),
target_table_name: z.string(),
target_column_name: z.string(),
target_columns: z.array(z.string()),
});

export const postgresColumnSchema = z.object({
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