diff --git a/packages/db/src/db/schema.ts b/packages/db/src/db/schema.ts
index 89dfee9..4babe8a 100644
--- a/packages/db/src/db/schema.ts
+++ b/packages/db/src/db/schema.ts
@@ -132,6 +132,7 @@ export const decks = pgTable(
     id: uuid().primaryKey().defaultRandom(),
     name: text().notNull(),
     description: text(),
+    source_language: varchar({ length: 10 }).notNull(),
     validated_for_languages: varchar({ length: 10 })
       .array()
       .notNull()
@@ -140,11 +141,19 @@ export const decks = pgTable(
     created_at: timestamp({ withTimezone: true }).defaultNow().notNull(),
   },
   (table) => [
+    check(
+      "source_language_check",
+      sql`${table.source_language} IN (${sql.raw(SUPPORTED_LANGUAGE_CODES.map((l) => `'${l}'`).join(", "))})`,
+    ),
     check(
       "validated_languages_check",
       sql`validated_for_languages <@ ARRAY[${sql.raw(SUPPORTED_LANGUAGE_CODES.map((l) => `'${l}'`).join(", "))}]::varchar[]`,
     ),
-    unique("unique_deck_name").on(table.name),
+    check(
+      "validated_languages_excludes_source",
+      sql`NOT (${table.source_language} = ANY(validated_for_languages))`,
+    ),
+    unique("unique_deck_name").on(table.name, table.source_language),
   ],
 );