Upload files to "backend/app"

backend/app/settings.py

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+import os
+from dataclasses import dataclass
+from pathlib import Path
+
+# The modal shows this many days of run history; retention can never be shorter.
+HISTORY_DAYS = 30
+
+
+@dataclass(frozen=True)
+class Settings:
+    db_path: Path
+    retention_days: int = 90
+    # Dev only: serve ../public from the API so you can run without nginx.
+    serve_static: bool = False
+
+
+def load_settings() -> Settings:
+    return Settings(
+        db_path=Path(os.environ.get("BACKUP_DASH_DB", "backup-dashboard.db")),
+        retention_days=max(HISTORY_DAYS, int(os.environ.get("BACKUP_DASH_RETENTION_DAYS", "90"))),
+        serve_static=os.environ.get("BACKUP_DASH_SERVE_STATIC") == "1",
+    )