diff --git a/infra/migrations/021_seed_saved_queries.sql b/infra/migrations/021_seed_saved_queries.sql
index c06bc63..d03b44c 100644
--- a/infra/migrations/021_seed_saved_queries.sql
+++ b/infra/migrations/021_seed_saved_queries.sql
@@ -1,4 +1,11 @@
 -- Seed pre-built saved queries for the SQL Explorer
+-- Add unique constraint on name to prevent duplicates on re-run
+DO $$ BEGIN
+  IF NOT EXISTS (SELECT 1 FROM pg_constraint WHERE conname = 'saved_queries_name_key') THEN
+    ALTER TABLE saved_queries ADD CONSTRAINT saved_queries_name_key UNIQUE (name);
+  END IF;
+END $$;
+
 INSERT INTO saved_queries (name, description, sql_text) VALUES
 ('Company Overview', 'All tracked companies with sector and status',
  'SELECT ticker, legal_name, sector, active, created_at FROM companies ORDER BY ticker'),
@@ -35,4 +42,4 @@ INSERT INTO saved_queries (name, description, sql_text) VALUES
 
 ('Source Coverage Matrix', 'Active sources per company',
  'SELECT c.ticker, c.legal_name, count(*) FILTER (WHERE s.source_type = ''market_api'') AS market, count(*) FILTER (WHERE s.source_type = ''news_api'') AS news, count(*) FILTER (WHERE s.source_type = ''filings_api'') AS filings, count(*) AS total FROM companies c LEFT JOIN sources s ON c.id = s.company_id AND s.active = TRUE WHERE c.active = TRUE GROUP BY c.ticker, c.legal_name ORDER BY c.ticker')
-ON CONFLICT DO NOTHING;
+ON CONFLICT (name) DO NOTHING;