work on optimising vcenter queries

db/queries/query.sql

@@ -119,3 +119,13 @@ INSERT INTO inventory_history (
     ?, ?, ?, ?, ?, ?, ?
 )
 RETURNING *;
+
+-- name: SqliteTableExists :one
+SELECT COUNT(1) AS count
+FROM sqlite_master
+WHERE type = 'table' AND name = sqlc.arg('table_name');
+
+-- name: SqliteColumnExists :one
+SELECT COUNT(1) AS count
+FROM pragma_table_info
+WHERE name = sqlc.arg('column_name');