Revised the PeriodChooser utility to find the start of the data by itself. It can do that. It's child classes are all doing the same thing. There is no need to do that in its child classes.

src/accounting/report/reports/utils/period_choosers.py

@@ -35,11 +35,8 @@ from .urls import journal_url, ledger_url, income_expenses_url, \
 class PeriodChooser(ABC):
     """The period chooser."""
 
-    def __init__(self, start: date | None):
-        """Constructs a period chooser.
-
-        :param start: The start of the period.
-        """
+    def __init__(self):
+        """Constructs a period chooser."""
 
         # Shortcut periods
         self.this_month_url: str = self._url_for(ThisMonth())
@@ -61,6 +58,10 @@ class PeriodChooser(ABC):
         self.url_template: str = self._url_for(TemplatePeriod())
         """The URL template."""
 
+        first: Transaction | None \
+            = Transaction.query.order_by(Transaction.date).first()
+        start: date | None = None if first is None else first.date
+
         # Attributes
         self.data_start: date | None = start
         """The start of the data."""
@@ -105,12 +106,6 @@ class PeriodChooser(ABC):
 class JournalPeriodChooser(PeriodChooser):
     """The journal period chooser."""
 
-    def __init__(self):
-        """Constructs the journal period chooser."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
-
     def _url_for(self, period: Period) -> str:
         return journal_url(period)
 
@@ -124,9 +119,7 @@ class LedgerPeriodChooser(PeriodChooser):
         """The currency."""
         self.account: Account = account
         """The account."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
+        super().__init__()
 
     def _url_for(self, period: Period) -> str:
         return ledger_url(self.currency, self.account, period)
@@ -141,9 +134,7 @@ class IncomeExpensesPeriodChooser(PeriodChooser):
         """The currency."""
         self.account: IncomeExpensesAccount = account
         """The account."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
+        super().__init__()
 
     def _url_for(self, period: Period) -> str:
         return income_expenses_url(self.currency, self.account, period)
@@ -156,9 +147,7 @@ class TrialBalancePeriodChooser(PeriodChooser):
         """Constructs the trial balance period chooser."""
         self.currency: Currency = currency
         """The currency."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
+        super().__init__()
 
     def _url_for(self, period: Period) -> str:
         return trial_balance_url(self.currency, period)
@@ -171,9 +160,7 @@ class IncomeStatementPeriodChooser(PeriodChooser):
         """Constructs the income statement period chooser."""
         self.currency: Currency = currency
         """The currency."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
+        super().__init__()
 
     def _url_for(self, period: Period) -> str:
         return income_statement_url(self.currency, period)
@@ -186,9 +173,7 @@ class BalanceSheetPeriodChooser(PeriodChooser):
         """Constructs the balance sheet period chooser."""
         self.currency: Currency = currency
         """The currency."""
-        first: Transaction | None \
-            = Transaction.query.order_by(Transaction.date).first()
-        super().__init__(None if first is None else first.date)
+        super().__init__()
 
     def _url_for(self, period: Period) -> str:
         return balance_sheet_url(self.currency, period)