Persist runtime config in app db and seed from env

app/models/__init__.py

@@ -1,6 +1,7 @@
 """SQLAlchemy models package."""
 
 from app.models.auth import AuthSession, AuthUser
+from app.models.config import AppConfigEntry
 from app.models.location import Location
 
-__all__ = ["AuthSession", "AuthUser", "Location"]
+__all__ = ["AppConfigEntry", "AuthSession", "AuthUser", "Location"]

app/models/config.py

@@ -0,0 +1,15 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.auth_db import AuthBase
+
+
+class AppConfigEntry(AuthBase):
+    __tablename__ = "app_config"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    key: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
+    value: Mapped[str] = mapped_column(String, nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)