fix: seed app_settings.currency от AURUM_DEFAULT_CURRENCY на чистой установке

backend/app/db/seed.py

@@ -79,9 +79,15 @@ async def seed_default_account(session: AsyncSession) -> None:
 
 
 async def seed_default_app_settings(session: AsyncSession) -> None:
-    """Ensures the singleton app_settings row (id=1) exists — the migration
-    already inserts it, but this makes app boot self-healing if that row is
-    ever missing (e.g. a DB restored from a pre-currency-setting backup)."""
+    """Ensures the singleton app_settings row (id=1) exists, seeded with
+    AURUM_DEFAULT_CURRENCY. The sole place that row gets created — the
+    9f3a2d7c5e11 migration only creates the table now, not the row itself
+    (an earlier version hardcoded the row to 'USD' at migration time, which
+    silently ignored AURUM_DEFAULT_CURRENCY on a fresh install since this
+    function's own get-or-create check would find the row already there).
+    Runs on every app boot (see main.py's lifespan), so it's also
+    self-healing if the row is ever missing (e.g. a DB restored from a
+    pre-currency-setting backup)."""
     existing = await session.get(AppSettings, 1)
     if existing is not None:
         return