Fix: Propagate priority through to DAG subtasks (#2078)

* feat: add priority column to v1_match

* feat: wire up writes

* fix: more wiring

* fix: migration name

sql/schema/v1-core.sql

@@ -462,6 +462,7 @@ CREATE TABLE v1_match (
     -- references the existing task id, which may be set when we're replaying a task
     trigger_existing_task_id bigint,
     trigger_existing_task_inserted_at timestamptz,
+    trigger_priority integer,
     CONSTRAINT v1_match_pkey PRIMARY KEY (id)
 );