added IF NOT EXISTS to create and CRUD for each table

backend/database/sql/queries/recordings.sql

@@ -1,3 +1,17 @@
--- name: GetAuthor :one
-SELECT * FROM recordings
+-- name: CreateRecording :one
+INSERT INTO recordings (name) VALUES (?)
+RETURNING *;
+
+-- name: GetRecording :one
+SELECT * FROM recordings 
 WHERE id = ? LIMIT 1;
+
+-- name: UpdateRecording :exec
+UPDATE recordings 
+SET name = ?
+WHERE id =?;
+
+-- name: DeleteRecording :exec
+DELETE FROM recordings 
+WHERE id =?;
+