Fix datetime truncation for mobile session schemas

All datetime fields in mobile session schemas must truncate to :second
because the database uses :utc_datetime type (without microseconds).

Fixed DateTime.utc_now() calls in:
- QRLoginToken.complete_changeset/2
- QRLoginToken.put_expiration/1
- MobileSession.touch_changeset/1
- MobileSession.put_timestamps/1

lib/towerops/mobile_sessions/mobile_session.ex

@@ -58,7 +58,8 @@ defmodule Towerops.MobileSessions.MobileSession do
   Updates the last_used_at timestamp for a session.
   """
   def touch_changeset(mobile_session) do
-    change(mobile_session, last_used_at: DateTime.utc_now())
+    last_used_at = DateTime.truncate(DateTime.utc_now(), :second)
+    change(mobile_session, last_used_at: last_used_at)
   end
 
   defp put_token(changeset) do
@@ -70,8 +71,8 @@ defmodule Towerops.MobileSessions.MobileSession do
   end
 
   defp put_timestamps(changeset) do
-    now = DateTime.utc_now()
-    default_expiration = DateTime.add(now, 90, :day)
+    now = DateTime.truncate(DateTime.utc_now(), :second)
+    default_expiration = now |> DateTime.add(90, :day) |> DateTime.truncate(:second)
 
     changeset
     |> put_change(:last_used_at, now)

lib/towerops/mobile_sessions/qr_login_token.ex

@@ -42,7 +42,8 @@ defmodule Towerops.MobileSessions.QRLoginToken do
   Marks a QR login token as completed.
   """
   def complete_changeset(qr_login_token, mobile_session_id) do
-    change(qr_login_token, completed_at: DateTime.utc_now(), mobile_session_id: mobile_session_id)
+    completed_at = DateTime.truncate(DateTime.utc_now(), :second)
+    change(qr_login_token, completed_at: completed_at, mobile_session_id: mobile_session_id)
   end
 
   defp put_token(changeset) do
@@ -57,7 +58,7 @@ defmodule Towerops.MobileSessions.QRLoginToken do
     if get_field(changeset, :expires_at) do
       changeset
     else
-      expires_at = DateTime.add(DateTime.utc_now(), 5, :minute)
+      expires_at = DateTime.utc_now() |> DateTime.add(5, :minute) |> DateTime.truncate(:second)
       put_change(changeset, :expires_at, expires_at)
     end
   end