diff --git a/README.md b/README.md
index a005f9b..3d93dca 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ These are the planned features
 ## User stories
 
 * as a user I want to know in advance if the query is returning what I expect
-* as a user I want to find all the bands in Wikidata without having to know how it is modeled
+* as a user I want to [find all the rock bands starting with 'M'](http://snapquery.bitplan.com/query/wikidata.org/snapquery-examples/bands) in Wikidata without having to know how it is modeled
 * as a user I want pay someone to help me get the information from Wikidata that I need
 * as a user I want to know how a query performed in the past so I can trust that the underlying model is stable and I
   get the expected results
diff --git a/snapquery/samples/meta_query.yaml b/snapquery/samples/meta_query.yaml
index c2576c7..57ee43d 100644
--- a/snapquery/samples/meta_query.yaml
+++ b/snapquery/samples/meta_query.yaml
@@ -14,6 +14,60 @@
         WHERE records>0
         GROUP BY endpoint_name
         ORDER BY 1 DESC
+'query_failures_by_category':
+    sql: |
+        SELECT 
+        count(*) as count,
+        nq.domain,
+        nq.namespace,
+        error_category
+        FROM QueryStats qs
+        JOIN NamedQuery nq
+        ON qs.query_id=nq.query_id
+        WHERE error_category IS NOT NULL 
+        
+        GROUP BY error_category,nq.namespace,nq.domain
+        ORDER BY 1 DESC
+'query_failures_by_category_grouped':
+    sql: |
+        SELECT 
+          count(*) AS count,
+          GROUP_CONCAT(DISTINCT nq.domain) AS domains,
+          GROUP_CONCAT(DISTINCT nq.namespace) AS namespaces,
+          error_category
+        FROM QueryStats qs
+        JOIN NamedQuery nq ON qs.query_id = nq.query_id
+        WHERE error_category IS NOT NULL
+        GROUP BY error_category
+        ORDER BY  count DESC;
+'query_failures_by_category_grouped_counted':
+    sql: |
+        SELECT 
+          error_category,
+          SUM(entry_count) AS total_count,
+          GROUP_CONCAT(DISTINCT domain_counts ORDER BY domain_count DESC) AS domain_counts,
+          GROUP_CONCAT(DISTINCT namespace_counts ORDER BY namespace_count DESC) AS namespace_counts,
+          GROUP_CONCAT(DISTINCT endpoint_counts ORDER BY endpoint_count DESC) AS endpoint_counts
+        FROM (
+          SELECT 
+            error_category,
+            domain,
+            namespace,
+            endpoint_name,
+            COUNT(*) AS entry_count,
+            domain || ' (' || SUM(COUNT(*)) OVER (PARTITION BY error_category, domain) || ')' AS domain_counts,
+            namespace || ' (' || SUM(COUNT(*)) OVER (PARTITION BY error_category, namespace) || ')' AS namespace_counts,
+            endpoint_name || ' (' || SUM(COUNT(*)) OVER (PARTITION BY error_category, endpoint_name) || ')' AS endpoint_counts,
+            SUM(COUNT(*)) OVER (PARTITION BY error_category, domain) AS domain_count,
+            SUM(COUNT(*)) OVER (PARTITION BY error_category, namespace) AS namespace_count,
+            SUM(COUNT(*)) OVER (PARTITION BY error_category, endpoint_name) AS endpoint_count
+          FROM QueryStats qs
+          JOIN NamedQuery nq ON qs.query_id = nq.query_id
+          WHERE error_category IS NOT NULL
+          GROUP BY error_category, domain, namespace, endpoint_name
+        ) sub
+        GROUP BY error_category
+        ORDER BY total_count DESC;
 'query_failures_by_database_count':
     sql: |
         SELECT
@@ -147,3 +201,18 @@
             database,
             method
         FROM Endpoint
+'scholia_jinja_for_loops':
+    sql: |
+        SELECT
+          count(*),
+          substr(
+            sparql,
+            instr(sparql, '{% for') + length('{% for'),  -- Start position right after "{% for"
+            instr(substr(sparql, instr(sparql, '{% for')), '%}') - length('{% for')  -- Length of substring
+          ) as for_loop_content
+        FROM
+          NamedQuery
+        WHERE
+          sparql LIKE '%{% for%' ESCAPE '\' and for_loop_content like "%in%"
+        group by for_loop_content
+        order by 1 desc
diff --git a/snapquery/snapquery_core.py b/snapquery/snapquery_core.py
index bd8c744..385e8cd 100644
--- a/snapquery/snapquery_core.py
+++ b/snapquery/snapquery_core.py
@@ -387,7 +387,9 @@ class QueryDetails:
     """
 
     query_id: str
-    params: str
+    params: str # e.g. q - q1,q2, 
+    default_params: str # e.g. Q80 - Q58631663, Q125422124  
+    default_param_types: str # e.g. Q5 - Q191067,Q43229
     param_count: int
     lines: int
     size: int
@@ -417,11 +419,15 @@ def from_sparql(cls, query_id: str, sparql: str) -> "QueryDetails":
         )  # Assuming Params is a class that can parse SPARQL queries to extract parameters
         params = ",".join(sparql_params.params) if sparql_params.params else None
         param_count = len(sparql_params.params)
-
+        # @TODO get parameters        
+        default_params=None
+        default_param_types=None
         # Create and return the QueryDetails instance
         return cls(
             query_id=query_id,
             params=params,
+            default_params=default_params,
+            default_param_types=default_param_types,
             param_count=param_count,
             lines=lines,
             size=size,
@@ -435,7 +441,13 @@ def get_samples(cls) -> dict[str, "QueryDetails"]:
         samples = {
             "snapquery-examples": [
                 QueryDetails(
-                    query_id="scholia.test", params="q", param_count=1, lines=1, size=50
+                    query_id="scholia.test", 
+                    params="q", 
+                    default_params="Q80",
+                    default_param_types="Q5",
+                    param_count=1, 
+                    lines=1, 
+                    size=50
                 )
             ]
         }
diff --git a/tests/test_snapquery_core.py b/tests/test_snapquery_core.py
index 3379919..c509252 100644
--- a/tests/test_snapquery_core.py
+++ b/tests/test_snapquery_core.py
@@ -2,9 +2,8 @@
 
 from lodstorage.query import Query
 
-from snapquery.snapquery_core import NamedQuery, NamedQueryManager
+from snapquery.snapquery_core import NamedQuery, NamedQueryManager, QueryPrefixMerger
 
-from snapquery_core import QueryPrefixMerger
 
 
 class TestQueryPrefixMerger(TestCase):