Fix: DB Migration

gatehouse_app/models/ssh_ca/ssh_certificate.py

@@ -50,7 +50,7 @@ class SSHCertificate(BaseModel):
     certificate = db.Column(db.Text, nullable=False)
 
     # Certificate metadata
-    serial = db.Column(db.String(255), nullable=False, unique=True, index=True)
+    serial = db.Column(db.String(255), nullable=False)
     key_id = db.Column(db.String(255), nullable=False)  # Usually user email
     cert_type = db.Column(
         db.Enum(CertType, values_callable=lambda x: [e.value for e in x]),
@@ -103,6 +103,8 @@ class SSHCertificate(BaseModel):
     )
 
     __table_args__ = (
+        db.UniqueConstraint("ca_id", "serial", name="uq_ssh_certificates_ca_serial"),
+        db.Index("ix_ssh_certificates_serial", "serial"),
         db.Index("idx_cert_user_status", "user_id", "status"),
         db.Index("idx_cert_validity", "valid_after", "valid_before"),
         db.Index("idx_cert_revoked", "revoked", "revoked_at"),