Add Migration model

models/migration.py

@@ -0,0 +1,16 @@
+from sqlalchemy import Column, String, DateTime, Boolean
+from sqlalchemy.sql import func
+from core.database import Base
+import uuid
+
+class Migration(Base):
+    __tablename__ = "migrations"
+    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
+    version = Column(String, nullable=False, index=True)
+    description = Column(String, nullable=True)
+    applied = Column(Boolean, default=False)
+    script_path = Column(String, nullable=False)
+    checksum = Column(String, nullable=True)
+    execution_time = Column(DateTime, nullable=True)
+    created_at = Column(DateTime, default=func.now())
+    updated_at = Column(DateTime, default=func.now(), onupdate=func.now())