Add post image storage

db/queries/posts.sql

@@ -61,6 +61,52 @@ SET
   updated_at = sqlc.arg(updated_at)
 WHERE id = sqlc.arg(id);
 
+-- name: CreatePostImage :exec
+INSERT INTO post_images (
+  id, post_id, object_key, public_url, description, position, width, height, created_at
+)
+VALUES (
+  sqlc.arg(id),
+  sqlc.arg(post_id),
+  sqlc.arg(object_key),
+  sqlc.arg(public_url),
+  sqlc.arg(description),
+  sqlc.arg(position),
+  sqlc.arg(width),
+  sqlc.arg(height),
+  sqlc.arg(created_at)
+);
+
+-- name: DeletePostImages :exec
+DELETE FROM post_images
+WHERE post_id = sqlc.arg(post_id);
+
+-- name: ListPostImages :many
+SELECT
+  id, post_id, object_key, public_url, description, position, width, height, created_at
+FROM post_images
+WHERE post_id = sqlc.arg(post_id)
+ORDER BY position;
+
+-- name: ListPostThreadImages :many
+WITH RECURSIVE thread AS (
+  SELECT p.id
+  FROM posts p
+  WHERE p.id = sqlc.arg(root_id) AND p.parent_id IS NULL
+
+  UNION ALL
+
+  SELECT child.id
+  FROM posts child
+  JOIN thread parent ON child.parent_id = parent.id
+)
+SELECT
+  images.id, images.post_id, images.object_key, images.public_url,
+  images.description, images.position, images.width, images.height, images.created_at
+FROM post_images images
+JOIN thread ON thread.id = images.post_id
+ORDER BY images.post_id, images.position;
+
 -- name: UpdateRootPostState :execrows
 UPDATE posts
 SET