Update utils/config.py

utils/config.py

@@ -1,21 +1,34 @@
-import os
-from dataclasses import dataclass
-
-@dataclass
-class AppConfig:
-    hf_model_repo: str
-    sql_backend: str # "bigquery" or "motherduck"
-    gcp_project: str | None = None
-    motherduck_db: str | None = None
-    motherduck_token: str | None = None
-
-
-@classmethod
-def from_env(cls):
-    return cls(
-        hf_model_repo=os.getenv("HF_MODEL_REPO", "your-username/your-private-tabular-model"),
-        sql_backend=os.getenv("SQL_BACKEND", "motherduck"),
-        gcp_project=os.getenv("GCP_PROJECT"),
-        motherduck_db=os.getenv("MOTHERDUCK_DB", "default"),
-        motherduck_token=os.getenv("MOTHERDUCK_TOKEN")
-)
+import os
+from dataclasses import dataclass
+
+@dataclass
+class AppConfig:
+    """
+    Central configuration class for the Tabular Agentic XAI app.
+    It reads all required environment variables for both BigQuery
+    and MotherDuck backends.
+    """
+    # Common
+    hf_model_repo: str
+    sql_backend: str  # "bigquery" or "motherduck"
+
+    # BigQuery
+    gcp_project: str | None = None
+
+    # MotherDuck
+    motherduck_db: str | None = None
+    motherduck_token: str | None = None
+
+    @classmethod
+    def from_env(cls):
+        """
+        Reads environment variables from .env (local) or Hugging Face Space Secrets.
+        Returns an AppConfig instance.
+        """
+        return cls(
+            hf_model_repo=os.getenv("HF_MODEL_REPO", "your-username/your-private-tabular-model"),
+            sql_backend=os.getenv("SQL_BACKEND", "motherduck"),
+            gcp_project=os.getenv("GCP_PROJECT"),
+            motherduck_db=os.getenv("MOTHERDUCK_DB", "default"),
+            motherduck_token=os.getenv("MOTHERDUCK_TOKEN")
+        )