Implement custom config class; get SQLAlchemy database URI from config

tofu_api/app.py

@@ -1,10 +1,9 @@
 import os
 
-import yaml
 from flask import Flask
 
 from tofu_api.api import TofuApiBlueprint
-from tofu_api.config import DefaultConfig
+from tofu_api.common.config import Config
 from tofu_api.dependencies import Dependencies
 
 
@@ -12,6 +11,12 @@ class App(Flask):
     """
     Flask application for Tofu API.
     """
+    # Override Flask classes
+    config_class = Config
+
+    # Set type hint for config
+    config: Config
+
     # Dependencies container
     dependencies: Dependencies
 
@@ -25,10 +30,9 @@ class App(Flask):
             instance_path=project_root_dir,
             instance_relative_config=True,
         )
-        self.config.from_object(DefaultConfig)
 
         # Load app configuration from YAML file
-        self.config.from_file(os.getenv('FLASK_CONFIG_FILE', default='config.yml'), load=yaml.safe_load)
+        self.config.from_yaml(os.getenv('FLASK_CONFIG_FILE', default='config.yml'))
 
         # Initialize DI container
         self.dependencies = Dependencies()