Implement custom config class; get SQLAlchemy database URI from config

tofu_api/common/config/config.py

@@ -0,0 +1,32 @@
+import yaml
+from flask import Config as BaseConfig
+
+from .defaults import DefaultConfig
+
+
+class Config(BaseConfig):
+    """
+    Custom config class for the Flask application.
+    """
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        # Set app-specific default values
+        self.from_object(DefaultConfig)
+
+    def from_yaml(self, filename: str, *, silent: bool = False) -> bool:
+        """
+        Update config from a YAML file.
+        """
+        return self.from_file(filename, load=yaml.safe_load, silent=silent)
+
+    # Properties for type safe access to config values
+
+    @property
+    def sqlalchemy_database_uri(self) -> str:
+        return self.get('SQLALCHEMY_DATABASE_URI')
+
+    @property
+    def sqlalchemy_echo(self) -> bool:
+        return bool(self.get('SQLALCHEMY_ECHO'))