pindexer: repair SQL syntax for create type/create domain

crates/bin/pindexer/src/dex/dex.sql

@@ -9,13 +9,17 @@
 -- that given an `penumbra_asset::asset::Id`, we always know exactly how to filter
 -- tables, rather than needing to do a join with another table.
 
-CREATE DOMAIN IF NOT EXISTS Amount AS NUMERIC(39, 0) NOT NULL;
 
+DROP TYPE IF EXISTS Value CASCADE;
+DROP DOMAIN IF EXISTS Amount;
+
+CREATE DOMAIN Amount AS NUMERIC(39, 0) NOT NULL;
 CREATE TYPE Value AS (
   amount Amount,
-  asset BYTEA NOT NULL
+  asset BYTEA
 );
 
+
 -- Keeps track of changes to the dex's value circuit breaker.
 CREATE TABLE IF NOT EXISTS dex_value_circuit_breaker_change (
   -- The asset being moved into or out of the dex.