Add DB indices to C++ metrics tables.

Author: mcserep

plugins/cpp_metrics/model/include/model/cppastnodemetrics.h

@@ -37,6 +37,8 @@ struct CppAstNodeMetrics
 
   #pragma db null
   double value;
+
+#pragma db index member(astNodeId)
 };
 
 #pragma db view \

plugins/cpp_metrics/model/include/model/cppfilemetrics.h

@@ -29,6 +29,8 @@ struct CppFileMetrics
 
   #pragma db not_null
   double value;
+
+#pragma db index member(file)
 };
 
 #pragma db view \

plugins/cpp_metrics/model/include/model/cpptypedependencymetrics.h

@@ -24,6 +24,9 @@ struct CppTypeDependencyMetrics
 
   #pragma db not_null
   std::uint64_t dependencyHash;
+
+#pragma db index member(entityHash)
+#pragma db index member(dependencyHash)
 };
 
 #pragma db view \