Fix accounting migrations so fresh deploys create regarding and event_name columns.

Make 0009/0010 idempotent and aligned with current models so server migrate after a wipe does not miss schema fields.

Co-authored-by: Cursor <cursoragent@cursor.com>

accounting/migrations/0009_treasury_event_name.py

@@ -1,11 +1,44 @@
 from django.db import migrations, models
 
 
+def _table_columns(schema_editor, table):
+    connection = schema_editor.connection
+    with connection.cursor() as cursor:
+        return {
+            col.name
+            for col in connection.introspection.get_table_description(cursor, table)
+        }
+
+
+def _ensure_varchar_column(schema_editor, table, column, max_length):
+    """Add a non-null varchar column with empty default when missing; else clear NULLs."""
+    connection = schema_editor.connection
+    q_table = connection.ops.quote_name(table)
+    q_column = connection.ops.quote_name(column)
+
+    if column in _table_columns(schema_editor, table):
+        with connection.cursor() as cursor:
+            cursor.execute(
+                f"UPDATE {q_table} SET {q_column} = '' WHERE {q_column} IS NULL"
+            )
+        return
+
+    with connection.cursor() as cursor:
+        cursor.execute(
+            f"ALTER TABLE {q_table} "
+            f"ADD COLUMN {q_column} varchar({max_length}) DEFAULT '' NOT NULL"
+        )
+
+
+def add_treasury_event_name(apps, schema_editor):
+    """
+    Add TreasuryTxn.event_name when missing.
+    Safe for fresh DBs and for DBs that already have the column from older deploys.
+    """
+    _ensure_varchar_column(schema_editor, 'accounting_treasury_txns', 'event_name', 200)
+
+
 class Migration(migrations.Migration):
-    """
-    DB already has event_name (NOT NULL) from an earlier manual/out-of-band change.
-    Sync Django state and ensure NULLs become empty string so inserts never omit the column.
-    """
 
     dependencies = [
         ('accounting', '0008_invoice_cancelled_status'),
@@ -21,10 +54,7 @@ class Migration(migrations.Migration):
                 ),
             ],
             database_operations=[
-                migrations.RunSQL(
-                    sql="UPDATE accounting_treasury_txns SET event_name = '' WHERE event_name IS NULL;",
-                    reverse_sql=migrations.RunSQL.noop,
-                ),
+                migrations.RunPython(add_treasury_event_name, migrations.RunPython.noop),
             ],
         ),
     ]