[hw-8] add: repo layer

comments/infra/repository/sqlc/query.sql

@@ -0,0 +1,24 @@
+-- name: InsertComment :one
+INSERT INTO comments (user_id, sku, text) VALUES ($1, $2, $3)
+RETURNING id, user_id, sku, text, created_at;
+
+-- name: GetCommentByID :one
+SELECT id, user_id, sku, text, created_at FROM comments WHERE id = $1;
+
+-- name: UpdateComment :one
+UPDATE comments
+SET text = $2
+WHERE id = $1
+RETURNING id, user_id, sku, text, created_at;
+
+-- name: ListCommentsBySku :many
+SELECT id, user_id, sku, text, created_at
+FROM comments
+WHERE sku = $1
+ORDER BY created_at DESC, user_id ASC;
+
+-- name: ListCommentsByUser :many
+SELECT id, user_id, sku, text, created_at
+FROM comments
+WHERE user_id = $1
+ORDER BY created_at DESC;