diff --git a/backend/goal_utils.py b/backend/goal_utils.py
index e4aee5e..1178005 100644
--- a/backend/goal_utils.py
+++ b/backend/goal_utils.py
@@ -245,82 +245,92 @@ def _fetch_by_aggregation_method(
     - min_30d: Minimum value in last 30 days
     - max_30d: Maximum value in last 30 days
     """
+    # Guard: source_table/column required for simple aggregation
+    if not table or not column:
+        print(f"[WARNING] Missing source_table or source_column for aggregation")
+        return None
+
     cur = get_cursor(conn)
 
-    if method == 'latest':
-        cur.execute(f"""
-            SELECT {column} FROM {table}
-            WHERE profile_id = %s AND {column} IS NOT NULL
-            ORDER BY date DESC LIMIT 1
-        """, (profile_id,))
-        row = cur.fetchone()
-        return float(row[column]) if row else None
+    try:
+        if method == 'latest':
+            cur.execute(f"""
+                SELECT {column} FROM {table}
+                WHERE profile_id = %s AND {column} IS NOT NULL
+                ORDER BY date DESC LIMIT 1
+            """, (profile_id,))
+            row = cur.fetchone()
+            return float(row[column]) if row else None
 
-    elif method == 'avg_7d':
-        days_ago = date.today() - timedelta(days=7)
-        cur.execute(f"""
-            SELECT AVG({column}) as avg_value FROM {table}
-            WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['avg_value']) if row and row['avg_value'] is not None else None
+        elif method == 'avg_7d':
+            days_ago = date.today() - timedelta(days=7)
+            cur.execute(f"""
+                SELECT AVG({column}) as avg_value FROM {table}
+                WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['avg_value']) if row and row['avg_value'] is not None else None
 
-    elif method == 'avg_30d':
-        days_ago = date.today() - timedelta(days=30)
-        cur.execute(f"""
-            SELECT AVG({column}) as avg_value FROM {table}
-            WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['avg_value']) if row and row['avg_value'] is not None else None
+        elif method == 'avg_30d':
+            days_ago = date.today() - timedelta(days=30)
+            cur.execute(f"""
+                SELECT AVG({column}) as avg_value FROM {table}
+                WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['avg_value']) if row and row['avg_value'] is not None else None
 
-    elif method == 'sum_30d':
-        days_ago = date.today() - timedelta(days=30)
-        cur.execute(f"""
-            SELECT SUM({column}) as sum_value FROM {table}
-            WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['sum_value']) if row and row['sum_value'] is not None else None
+        elif method == 'sum_30d':
+            days_ago = date.today() - timedelta(days=30)
+            cur.execute(f"""
+                SELECT SUM({column}) as sum_value FROM {table}
+                WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['sum_value']) if row and row['sum_value'] is not None else None
 
-    elif method == 'count_7d':
-        days_ago = date.today() - timedelta(days=7)
-        cur.execute(f"""
-            SELECT COUNT(*) as count_value FROM {table}
-            WHERE profile_id = %s AND date >= %s
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['count_value']) if row else 0.0
+        elif method == 'count_7d':
+            days_ago = date.today() - timedelta(days=7)
+            cur.execute(f"""
+                SELECT COUNT(*) as count_value FROM {table}
+                WHERE profile_id = %s AND date >= %s
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['count_value']) if row else 0.0
 
-    elif method == 'count_30d':
-        days_ago = date.today() - timedelta(days=30)
-        cur.execute(f"""
-            SELECT COUNT(*) as count_value FROM {table}
-            WHERE profile_id = %s AND date >= %s
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['count_value']) if row else 0.0
+        elif method == 'count_30d':
+            days_ago = date.today() - timedelta(days=30)
+            cur.execute(f"""
+                SELECT COUNT(*) as count_value FROM {table}
+                WHERE profile_id = %s AND date >= %s
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['count_value']) if row else 0.0
 
-    elif method == 'min_30d':
-        days_ago = date.today() - timedelta(days=30)
-        cur.execute(f"""
-            SELECT MIN({column}) as min_value FROM {table}
-            WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['min_value']) if row and row['min_value'] is not None else None
+        elif method == 'min_30d':
+            days_ago = date.today() - timedelta(days=30)
+            cur.execute(f"""
+                SELECT MIN({column}) as min_value FROM {table}
+                WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['min_value']) if row and row['min_value'] is not None else None
 
-    elif method == 'max_30d':
-        days_ago = date.today() - timedelta(days=30)
-        cur.execute(f"""
-            SELECT MAX({column}) as max_value FROM {table}
-            WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
-        """, (profile_id, days_ago))
-        row = cur.fetchone()
-        return float(row['max_value']) if row and row['max_value'] is not None else None
+        elif method == 'max_30d':
+            days_ago = date.today() - timedelta(days=30)
+            cur.execute(f"""
+                SELECT MAX({column}) as max_value FROM {table}
+                WHERE profile_id = %s AND date >= %s AND {column} IS NOT NULL
+            """, (profile_id, days_ago))
+            row = cur.fetchone()
+            return float(row['max_value']) if row and row['max_value'] is not None else None
 
-    else:
-        print(f"[WARNING] Unknown aggregation method: {method}")
+        else:
+            print(f"[WARNING] Unknown aggregation method: {method}")
+            return None
+
+    except Exception as e:
+        print(f"[ERROR] Failed to fetch value from {table}.{column} using {method}: {e}")
         return None