diff --git a/lib/mv/accounts/user/validations/email_not_used_by_other_member.ex b/lib/mv/accounts/user/validations/email_not_used_by_other_member.ex
index 8c28af6..9f900eb 100644
--- a/lib/mv/accounts/user/validations/email_not_used_by_other_member.ex
+++ b/lib/mv/accounts/user/validations/email_not_used_by_other_member.ex
@@ -91,7 +91,13 @@ defmodule Mv.Accounts.User.Validations.EmailNotUsedByOtherMember do
       {:ok, _} ->
         {:error, field: :email, message: "is already used by another member", value: email}
 
-      {:error, _} ->
+      {:error, reason} ->
+        require Logger
+
+        Logger.warning(
+          "Email uniqueness validation query failed for user email '#{email}': #{inspect(reason)}. Allowing operation to proceed (fail-open)."
+        )
+
         :ok
     end
   end
diff --git a/lib/mv/membership/member/validations/email_not_used_by_other_user.ex b/lib/mv/membership/member/validations/email_not_used_by_other_user.ex
index 3e6ae58..78af70c 100644
--- a/lib/mv/membership/member/validations/email_not_used_by_other_user.ex
+++ b/lib/mv/membership/member/validations/email_not_used_by_other_user.ex
@@ -63,7 +63,13 @@ defmodule Mv.Membership.Member.Validations.EmailNotUsedByOtherUser do
       {:ok, _} ->
         {:error, field: :email, message: "is already used by another user", value: email}
 
-      {:error, _} ->
+      {:error, reason} ->
+        require Logger
+
+        Logger.warning(
+          "Email uniqueness validation query failed for member email '#{email}': #{inspect(reason)}. Allowing operation to proceed (fail-open)."
+        )
+
         :ok
     end
   end