Added fallback handling for transactions with unknown dates.

matemat/db/facade.py

@@ -619,7 +619,9 @@ class MatematDatabase(object):
             fromdate, min_id = row
             created: datetime = datetime.fromtimestamp(fromdate)
             cursor.execute('''
-            SELECT t.ta_id, t.value, t.old_balance, t.date, c.ta_id, d.ta_id, m.ta_id, c.product, m.agent, m.reason
+            SELECT
+              t.ta_id, t.value, t.old_balance, COALESCE(t.date, 0),
+              c.ta_id, d.ta_id, m.ta_id, c.product, m.agent, m.reason
             FROM transactions AS t
             LEFT JOIN consumptions AS c
               ON t.ta_id = c.ta_id

matemat/db/primitives/Transaction.py

@@ -19,6 +19,8 @@ class Transaction:
 
     @property
     def receipt_date(self) -> str:
+        if self.date == datetime.fromtimestamp(0):
+            return '<unknown>        '
         date: str = self.date.strftime('%d.%m.%Y, %H:%M')
         return date