Make migrations (mostly) idempotent.

config/sql/videos.sql

@@ -2,7 +2,7 @@
 
 -- DROP TABLE public.videos;
 
-CREATE TABLE public.videos
+CREATE TABLE IF NOT EXISTS public.videos
 (
   id text NOT NULL,
   info text,
@@ -10,13 +10,13 @@ CREATE TABLE public.videos
   CONSTRAINT videos_pkey PRIMARY KEY (id)
 );
 
-GRANT ALL ON TABLE public.videos TO kemal;
+GRANT ALL ON TABLE public.videos TO current_user;
 
 -- Index: public.id_idx
 
 -- DROP INDEX public.id_idx;
 
-CREATE UNIQUE INDEX id_idx
+CREATE UNIQUE INDEX IF NOT EXISTS id_idx
   ON public.videos
   USING btree
   (id COLLATE pg_catalog."default");