2.0+ public access setup

db.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+from typing import Any
+
+try:
+    from flask_migrate import Migrate
+    from flask_sqlalchemy import SQLAlchemy
+except ModuleNotFoundError:  # pragma: no cover - exercised only before deps install.
+    Migrate = None
+    SQLAlchemy = None
+
+
+db = SQLAlchemy() if SQLAlchemy is not None else None
+migrate = Migrate() if Migrate is not None else None
+
+
+def database_extensions_available() -> bool:
+    return db is not None and migrate is not None
+
+
+def init_database(app: Any) -> bool:
+    if not database_extensions_available():
+        app.config["DATABASE_EXTENSIONS_AVAILABLE"] = False
+        return False
+
+    import db_models  # noqa: F401 - registers SQLAlchemy models with metadata.
+
+    db.init_app(app)
+    migrate.init_app(app, db)
+    app.config["DATABASE_EXTENSIONS_AVAILABLE"] = True
+    return True