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calorie_tracker_app/config.py

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+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+class Config:
+    SECRET_KEY = os.getenv('SECRET_KEY', 'dev-secret-key-change-in-production')
+    # Use environment variable for DB URI if available, otherwise default to local file
+    # For Docker, we'll map a volume to /app/data and use sqlite:////app/data/calorie_tracker.db
+    SQLALCHEMY_DATABASE_URI = os.getenv('DATABASE_URL', 'sqlite:///calorie_tracker.db')
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    API_NINJAS_KEY = os.getenv('API_NINJAS_KEY', '')
+    
+    # User defaults
+    DEFAULT_WATER_GOAL_ML = 2000
+    DEFAULT_CALORIE_TARGET = 2000