runtime settings loaded from DB/ refactoring admin-panel/ minor fixes and improvements

database/settings.py

@@ -0,0 +1,37 @@
+from typing import Any
+
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from .models import Setting
+
+
+async def get_setting(session: AsyncSession, key: str, default: Any = None) -> Any:
+    stmt = select(Setting).where(Setting.key == key)
+    result = await session.execute(stmt)
+    setting = result.scalar_one_or_none()
+    if setting is None or setting.value is None:
+        return default
+    return setting.value
+
+
+async def set_setting(
+    session: AsyncSession,
+    key: str,
+    value: Any,
+    description: str | None = None,
+) -> Setting:
+    stmt = select(Setting).where(Setting.key == key)
+    result = await session.execute(stmt)
+    setting = result.scalar_one_or_none()
+
+    if setting is None:
+        setting = Setting(key=key, value=value, description=description)
+        session.add(setting)
+    else:
+        setting.value = value
+        if description is not None:
+            setting.description = description
+
+    await session.flush()
+    return setting