Improved SFW and tag media seed file to allow updates.

migrations/20190325001339_releases.js

@@ -45,26 +45,21 @@ exports.up = knex => Promise.resolve()
 		table.text('comment');
 		table.text('group');
 
+		table.boolean('is_sfw')
+			.defaultTo(false);
+
 		table.unique('hash');
 		table.unique('source');
 
 		table.datetime('created_at')
 			.defaultTo(knex.fn.now());
 	}))
-	.then(() => knex.schema.createTable('media_sfw', (table) => {
-		table.text('id', 21)
-			.primary();
-
-		table.text('media_id', 21)
-			.references('id')
-			.inTable('media')
-			.unique();
-	}))
 	.then(() => { // eslint-disable-line arrow-body-style
 		// allow vim fold
 		return knex.raw(`
 			CREATE FUNCTION get_random_sfw_media_id() RETURNS varchar AS $$
-				SELECT media_id FROM media_sfw
+				SELECT id FROM media
+				WHERE is_sfw = true
 				ORDER BY random()
 				LIMIT 1;
 			$$ LANGUAGE sql STABLE;