Phase 0 Complete by ClaudeCode

backend/shared/exceptions.py

@@ -0,0 +1 @@
+# TODO: Custom error handlers

backend/shared/firebase.py

@@ -0,0 +1,24 @@
+import firebase_admin
+from firebase_admin import credentials, firestore
+from config import settings
+
+db = None
+firebase_initialized = False
+
+
+def init_firebase():
+    """Initialize Firebase Admin SDK. Call once at app startup."""
+    global db, firebase_initialized
+    try:
+        cred = credentials.Certificate(settings.firebase_service_account_path)
+        firebase_admin.initialize_app(cred)
+        db = firestore.client()
+        firebase_initialized = True
+    except Exception as e:
+        print(f"[WARNING] Firebase init failed: {e}")
+        firebase_initialized = False
+
+
+def get_db():
+    """Return the Firestore client. None if Firebase is not initialized."""
+    return db