diff --git a/supabase/migrations/20260320000100_scan_history_country.sql b/supabase/migrations/20260320000100_scan_history_country.sql
new file mode 100644
index 00000000..0899d5a9
--- /dev/null
+++ b/supabase/migrations/20260320000100_scan_history_country.sql
@@ -0,0 +1,18 @@
+-- Migration: Add scan_country to scan_history
+-- Purpose: Captures user's catalog region at scan time (from user_preferences.country).
+--          Enables country-scoped scan analytics and downstream country-aware features.
+-- Nullable: Existing rows have no country context; old API callers still work.
+-- Rollback: ALTER TABLE public.scan_history DROP COLUMN IF EXISTS scan_country;
+-- Issue: #921 | Epic: #920
+
+ALTER TABLE public.scan_history
+  ADD COLUMN IF NOT EXISTS scan_country text
+  REFERENCES public.country_ref(country_code);
+
+-- Partial index for country-scoped analytics queries
+CREATE INDEX IF NOT EXISTS idx_sh_country
+  ON public.scan_history (scan_country)
+  WHERE scan_country IS NOT NULL;
+
+COMMENT ON COLUMN public.scan_history.scan_country IS
+  'User catalog region at scan time (from user_preferences.country). NULL for legacy rows.';
diff --git a/supabase/tests/schema_contracts.test.sql b/supabase/tests/schema_contracts.test.sql
index d5f16fde..8d5411cf 100644
--- a/supabase/tests/schema_contracts.test.sql
+++ b/supabase/tests/schema_contracts.test.sql
@@ -7,7 +7,7 @@
 -- ─────────────────────────────────────────────────────────────────────────────
 
 BEGIN;
-SELECT plan(288);
+SELECT plan(297);
 
 -- ═══════════════════════════════════════════════════════════════════════════
 -- 1. Core data tables exist
@@ -421,5 +421,12 @@ SELECT has_function('public', 'api_unwatch_product',                         'fu
 SELECT has_function('public', 'api_get_watchlist',                           'function api_get_watchlist exists');
 SELECT has_trigger('products', 'trg_record_score_change',                    'trigger trg_record_score_change exists on products');
 
+-- ─── scan_history.scan_country (#921, epic #920) ─────────────────────────────
+SELECT has_column('public', 'scan_history', 'scan_country',       'scan_history has scan_country column');
+SELECT col_is_null('public', 'scan_history', 'scan_country',      'scan_history.scan_country is nullable');
+SELECT fk_ok('public', 'scan_history', 'scan_country',
+             'public', 'country_ref', 'country_code',
+             'scan_history.scan_country references country_ref(country_code)');
+
 SELECT * FROM finish();
 ROLLBACK;