Add configuration table

auth/sql/queries/config.sql

@@ -0,0 +1,21 @@
+-- name: LoadConfig :many
+select
+	*
+from
+	config;
+
+-- name: SaveConfig :one
+insert into config(key, value)
+	values ($1, $2)
+on conflict (key)
+	do update set
+		value = excluded.value
+	returning
+		*;
+
+-- name: DeleteConfig :one
+delete from config
+where key = $1
+returning
+	*;
+