fix: correctly apply due dates for contract and invoice upload reminders

config/services.yaml

@@ -9,11 +9,14 @@ parameters:
 
     teamer_inactive_period: '-2 years'
 
-    # Deadlines quoted to teamers in the transactional mails. They are passed to the mail
-    # texts as placeholders rather than typed into the wording, so what an admin edits can
-    # never drift from the period the application actually works with.
-    contract_upload_deadline_days: 7
-    # Also drives when the reminder goes out: three days before the deadline expires.
+    # The contract upload period, counted from the creation of the disposition. This is the
+    # single definition: the reminder mail, the "Honorarvertrag fällig" flag on the teamer
+    # dashboard, the admin list of overdue contracts and the wording of the mails all read it,
+    # so they cannot mark the same disposition due on three different days.
+    contract_upload_deadline_days: 5
+
+    # The invoice upload period, counted from the end of the assignment. The teamer is
+    # reminded the day after the assignment ends and again on the last day of this period.
     invoice_upload_deadline_days: 14
 
     # Messenger transport the mails of a teamer mailing are queued on. An X-Bus-Transport