diff --git a/app/models/currency.py b/app/models/currency.py
index f742be3..5f123fd 100644
--- a/app/models/currency.py
+++ b/app/models/currency.py
@@ -3,9 +3,8 @@
 from __future__ import annotations
 
 import uuid
-from datetime import datetime
 
-from sqlalchemy import Boolean, DateTime, Index, String
+from sqlalchemy import Boolean, Index, String, UniqueConstraint
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -17,6 +16,7 @@ class Currency(Base, TenantMixin):
 
     __tablename__ = "currencies"
     __table_args__ = (
+        UniqueConstraint("tenant_id", "code", name="uq_currency_tenant_code"),
         Index("ix_currencies_tenant_code", "tenant_id", "code"),
         Index("ix_currencies_tenant_default", "tenant_id", "is_default"),
     )
@@ -24,7 +24,7 @@ class Currency(Base, TenantMixin):
     id: Mapped[uuid.UUID] = mapped_column(
         PGUUID(as_uuid=True), primary_key=True, default=uuid.uuid4
     )
-    code: Mapped[str] = mapped_column(String(3), nullable=False, unique=True)
+    code: Mapped[str] = mapped_column(String(3), nullable=False)
     name: Mapped[str] = mapped_column(String(50), nullable=False)
     symbol: Mapped[str] = mapped_column(String(5), nullable=False)
     is_default: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)