diff --git a/sql.d/schema/create_schema_tables.sql b/sql.d/schema/create_schema_tables.sql
index abe5b537..64f10123 100644
--- a/sql.d/schema/create_schema_tables.sql
+++ b/sql.d/schema/create_schema_tables.sql
@@ -468,10 +468,10 @@ DROP TABLE IF EXISTS statistics_history CASCADE;
 CREATE TABLE statistics_history (
 	ts timestamp with time zone NOT NULL PRIMARY KEY,
 	snapshot jsonb NOT NULL,
-	num_packages integer,
-	num_projects integer,
-	num_problems integer,
-	num_maintainers integer
+	num_packages integer NOT NULL,
+	num_projects integer NOT NULL,
+	num_problems integer NOT NULL,
+	num_maintainers integer NOT NULL
 );
 
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